WO2002000772A1 - Biaxially oriented polyester film, adhesive film, and laminated film - Google Patents

Abstract

A biaxially oriented polyester film for optical use which combines handleability with a hue contrast; an adhesive film; and a laminated film. The biaxially oriented polyester film contains a colorant incorporated therein and has a haze of 5% or lower. In this film, the average light transmittance in the wavelength range of 450 to 650 nm, Tav, is 40 to 80%, and the value obtained by dividing the light transmittance (Ti) at each wavelength, i, within that wavelength range by the Tav is 0.7 to 1.3. The adhesive film and the laminated film are made with the biaxially oriented polyester film.

Description

 Biaxially oriented polyester film, adhesive film and laminated film

Technical field

 The present invention relates to a biaxially oriented polyester film, an adhesive film, and a laminated film. More specifically, the invention relates to a biaxially oriented polyester film suitable for use by bonding to an image display surface, an adhesive film and a laminated film using the same.

You.

 Fine

 Conventional technology

 TVs and personal computer CRT displays emit images by displaying three lights, blue light, green light and red light, but also emit the intermediate colors of blue light and green light or green light and red light. Therefore, there is a problem that the hue contrast of the image is blurred by the light of these intermediate colors. And this problem has been strongly desired to be improved because personal computers are rapidly spreading and the situation of watching it for a long time is increasing.

As a countermeasure against this problem, Japanese Patent Application Laid-Open No. H11-333556 discloses that when attaching a protective film consisting of a protective layer and an adhesive layer to the image display surface, the adhesive layer is mixed with a carbon black. No. 39 proposes this. According to the publication, the carbon black of the pressure-sensitive adhesive layer increases the average absorbance over each wavelength in the visible light band, so that the transmission of blue light and green light, and the transmission of intermediate colors of green light and red light respectively. It is disclosed that the contrast can be suppressed and the hue contrast of the image becomes clear. Means for increasing the absorbance of the protective film of the publication include increasing the concentration of the light absorbing agent in the pressure-sensitive adhesive layer and increasing the thickness of the pressure-sensitive adhesive layer. In the former case, the addition concentration is naturally limited because it causes a decrease in the bonding strength of the adhesive layer and a decrease in handleability. On the other hand, the latter may be appropriately selected according to the type of the adhesive and the surface roughness of the surface to be bonded, and the thickness of the adhesive layer such as a CRT display is preferably in the range of 5 to 40 m. No more adhesive layer thickness Does not function as an adhesive, but rather reduces the ease of handling in the processing and bonding processes.

 On the other hand, coloring the protective layer instead of the pressure-sensitive adhesive layer has been proposed in JP-A-2000-57976. Specifically, the protective layer is composed of a base film or a hard coat layer serving as a base material. According to the publication, a pigment is mixed with a binder resin, and the mixture is cured and laminated on the base film as a hard coat layer or a new layer. And dyeing the base film with a dye. However, according to the publication, the layer to which the colorant is added is as thin as 6 to 10 m except for the base film. In addition, when the hard coat layer is colored, the addition concentration is high when the hard coat layer is colored, so that the abrasion resistance and the abrasion resistance of the hard coat decrease. In addition, providing a new binder layer on the colored layer also has the problem of complicating the process.

 In addition, the method of dyeing the base film with a dye requires a separate dyeing step for dyeing, which causes a problem that the production process becomes complicated and the production cost increases. In addition, when an adhesive layer is provided to improve the adhesiveness when another layer is laminated on the base film, the film provided with the adhesive layer at the time of forming the base film is: The dyeing process has a problem that the adhesion of the adhesive layer to the hard coat layer and the pressure-sensitive adhesive layer is impaired. Thus, there has been a problem that adhesion between the base film and the adhesive layer is poor.

 Therefore, it has been strongly desired to provide a protective film for optics having good visibility that overcomes the above-mentioned drawbacks. In addition, in the optical protective film, in addition to improving the hue contrast of the image display and simplifying the process and improving the handleability of the pressure-sensitive adhesive layer, in addition to improving the transparency, improving the visibility due to extraneous light, There has been a strong demand for improvement in abrasion resistance or prevention of delamination between layers constituting the protective film.

 Disclosure of the invention

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to improve the handleability and hue contrast. An object of the present invention is to provide a biaxially oriented polyester film having the same function.

 Another object of the present invention is to provide a laminated film having improved transparency, visibility by external light, and abrasion resistance.

 Still other objects and advantages of the present invention will become apparent from the following description.

 According to the present invention, the above objects and advantages of the present invention are:

 (1) containing a dye,

 (2) Haze value is 5% or less,

 (3) The average value (T av) of light transmittance at a wavelength of 450 to 65 nm is 40 to 80%,

 (4) The value obtained by dividing the transmittance (T i) of the light beam of each wavelength i at a wavelength of 450-650 nm by T aV is 0.7-1.3, and

 (5) A biaxially oriented polyester film, which is a base film for a laminated film for bonding an image display surface.

 According to the present invention, the above objects and advantages of the present invention are secondly achieved by an adhesive film comprising the biaxially oriented polyester film of the present invention and a first adhesive layer provided on at least one surface of the film. Achieved.

 According to the present invention, the above objects and advantages of the present invention are: Thirdly, the biaxially oriented polyester film of the present invention, a first adhesive layer provided on both sides of the film, and a first adhesive layer on one side. A surface different from the surface in contact with the biaxially oriented polyester film of the hard coat layer and the other first adhesive layer provided on the surface different from the surface in contact with the biaxially oriented polyester film This is achieved by a laminated film for bonding a video display surface, comprising a second adhesive layer provided thereon.

 Embodiment of the Invention

Looking at the relationship between the emission color intensity of CRTs and the like and the wavelength of light, there are three peaks, blue, green, and red, from the short wavelength side. The problem is that the tails of the blue and green and green and red peaks overlap. For this reason, even if only blue or green is developed, the intermediate color between blue and green is formed, or if only green or only red is developed, the intermediate color between red and green, that is, a yellowish color is formed, These neutral colors increase the contrast of the image May cause weakening. Therefore, in the present invention, a dye is added to the biaxially oriented film itself in order to remove or weaken these intermediate colors, and the light transmittance of the biaxially oriented film over the entire wavelength region is appropriately reduced, so that the above-mentioned three primary colors are removed. By preventing the superimposed portion from being transmitted, it is possible to achieve both visibility and contrast of the hue of the image. Hereinafter, first, the biaxially oriented polyester film of the present invention will be described in detail.

The biaxially oriented polyester film of the present invention has an average transmittance (Tav) in the wavelength range of 450 to 650 nm in the range of 40 to 80% in order not to transmit the overlapping portion of the three primary colors. It is necessary. If Tav exceeds 80%, the effect of enhancing contrast cannot be sufficiently exhibited, while if Tav is less than 40%, the entire area of the screen becomes longer and visibility deteriorates. The preferred lower limit of Tav is 50%, and the preferred upper limit of TaV is 70%. In the present specification, Tav may be hereinafter referred to as an average transmittance. Further, the ratio (T i ZT a V) between the transmittance (T i) of the light beam at each wavelength in the wavelength range and the average value (T aV) of the transmittance in the wavelength range is 0.7 to 1.3. Must be in the range of When the value of TiZTaV is less than 0.7 or more than 1.3, the transmitted light is colored by the biaxially oriented polyester film, and the coloring is biased. The upper limit of T i / Tav is preferably 1.2, and more preferably 1.10. On the other hand, the lower limit of TiZTaV is preferably 0.8, and more preferably 0.9. In addition, when increasing the absorbance in the present invention, it is important not to increase the haze value. The biaxially oriented polyester film of the present invention needs to have a haze value of 5% or less. If the haze value is larger than 5%, the hue of the image becomes cloudy, and the visibility deteriorates due to lack of sharpness. Means for reducing the Haze of the biaxially oriented film to 5% or less and the T aV to 80% or less include, for example, using a pigment having a particle size of 500 nm or less or a dye as a pigment. The haze value of the biaxially oriented polyester film is preferably 3% or less, particularly preferably 2% or less. The amount of the dye added is preferably in the range of 0.02 to 0.42 g per unit area (m ² ) of the surface perpendicular to the thickness direction of the biaxially oriented polyester film.

Dyes used in the present invention include organic dyes and pigments. Generally, organic dyes have lower weather resistance than pigments. The haze goes up.

Therefore, when a pigment is used, it is necessary to suppress an increase in haze by reducing the particle size. The pigment blended in the biaxially oriented polyester film of the present invention has good dispersibility in the polyester constituting the biaxially oriented polyester film to prevent a decrease in the haze value. It is preferable to use a material having an appropriate particle size distribution and reducing the absorbance at each wavelength on average for the same reason as the dye. Specifically, the average particle size after dispersion is preferably from 10 to 50 O nm from the viewpoint of dispersibility in polyester. Particularly preferable amount of the case of the pigment unit area in a plane perpendicular to the thickness direction of the biaxially Oriented polyester film (m ²⁾ per 0 2 7~0. 2 0 7 g is preferred. Further, since the absorbance at each wavelength is reduced on average, the pigment is preferably a black car pump rack or cobalt oxide. Alternatively, a mixture of colored pigments so that the hue becomes black may be used. Examples of colored pigments include phthalocyanine pigments, quinacdrine pigments, perylene pigments, and indanthrene blue pigments.

 Organic dyes, on the other hand, generally have poorer heat stability and weatherability than pigments. However, in the present invention, since the organic dye is added to the polyester, most of the ultraviolet light is absorbed by the polyester. Is possible. Further, in the present invention, the organic dye to be blended into the biaxially oriented polyester film is preferably one that hardly undergoes deterioration or deterioration at a temperature of 330 ° C. or lower in consideration of the heat history up to the final product. Specific examples include anthraquinone dyes, quinacdrine dyes, and pyrinone dyes. Further, when the selective transmittance is further developed by the dye, the transmitted light is biased and colored. Therefore, it is preferable to use a mixture of at least two types of organic dyes to reduce the absorbance at each wavelength on average.

Examples of the organic dye preferably used in the present invention include a perinone dye represented by the following formula (1) and an anthraquinone dye represented by the following formulas (2) to (4).

In the above formulas (1) to (4), Ri R ¹⁶ is each independently a hydrogen atom, an aliphatic group having 1 to 6 carbon atoms, an aromatic group having 6 to 14 carbon atoms, an aromatic group having 14 carbon atoms, aromatic alkyl group, a heterocyclic group having 4 to 12 carbon atoms, a halogen atom, Shiano group, a nitro group, one CO R ^17, one COOR ^17, one NR ¹⁷ R ^18, one NR ¹⁸ C_〇_R ^19, one NR ¹⁸ S_〇 ₉ R ^19, one _{^{CONR 17 R ls, _S0 2 NR}} 17 R 18, -COR 19, one S_〇 ₂ R ^19, one COR ^19, one NR ¹⁷ CONR ¹⁸ R ^19, one C_〇_NR ¹⁸ S_〇 represents ₂ R ¹⁹ or a _{^{S0 2 NR 18 C oR 19,}} R 17 and R ¹⁸ are each independently a hydrogen atom, an aliphatic group having 1 to 6 carbon atoms, 4 aromatic group or a carbon number of 6 to 14 carbon atoms there in either a 12 heterocyclic group R ¹⁷ and R ^ls may form a connexion 5 or 6-membered heterocyclic group together with the nitrogen atom to which they are attached and R ¹⁹ is a carbon Aliphatic group having 1 to 6 carbon atoms, aromatic group having 6 to 14 carbon atoms Other represents a heterocyclic group of 4 to 12 carbon atoms.

The organic dye in which at least two kinds of the above organic dyes are mixed absorbs evenly over the entire visible light range and does not shift in hue. Particularly preferred combinations of organic dyes are The ratio of each of the four dyes represented by the formulas (1) to (4) in the organic dye mixture is 20 to 60 mol% of the verinone dye represented by the formula (1), and the formula (2) Of the anthraquinone dye of the formula (3), from 10 to 40 mol% of the anthraquinone dye of the formula (3) and from 10 to 30 mol% of the anthraquinone dye of the formula (4). It was done. Such a mixture of organic dyes expresses a clear hue contrast with little transmission of the above-mentioned superimposed portion of the light of the three primary colors. The most preferred combinations of organic dyes are 30 to 50 mol% of the perinone dye of the formula (1), 10 to 20 mol% of the anthraquinone dye of the formula (2), and 25 to 50 mol% of the anthraquinone dye of the formula (3). ~ 35 mol% and an anthraquinone dye of the formula (4) in an amount of from 10 to 20 mol%.

In the case of the organic dye, a particularly preferred addition amount is from 0.021 to 0.214 g per unit area (m ² ) of a plane perpendicular to the thickness direction of the biaxially oriented polyester film. As a method for adding the pigment, the pigment may be dispersed and dissolved in ethylene glycol or the like and added at the polymerization stage of the polyester.However, from the viewpoints of film productivity, prevention of contamination of foreign substances, and simplification of the process, the film A method is preferred in which pellets of a polyester resin to which a dye is added at a higher concentration than the addition concentration or a pellet obtained by melting and solidifying the dye itself are mixed and added. In melting and solidifying the dye, a binder may be appropriately added. As a mixing method, particularly in a pellet obtained by melting and solidifying a coloring matter, a method of adding with a small feeder is preferable because mechanical properties are different from pellets of polyester resin. The addition amount by the feeder varies depending on the capacity and the addition amount of the extruder, but is preferably 0.2 to 20 kgZh force on the equipment. As the properties of the dye to be added to the polyester, from the viewpoint of productivity, a dye which causes little decrease in the viscosity of the polyester resin during extrusion of the polyester is preferable. In order to suppress a decrease in the viscosity of the molten polyester resin, the residence time is preferably 20 to 400 seconds at a shear deformation rate of the extruder of 0 (1 second). When this value is less than 20, the pigment is not sufficiently kneaded and uneven coloring is observed. On the other hand, when the value is more than 400 seconds, cutting due to a decrease in viscosity is liable to occur.

The polyester constituting the biaxially oriented polyester film in the present invention is preferably It is a linear saturated polyester synthesized from an aromatic dibasic acid or an ester-forming derivative thereof, and a diol or an ester-forming derivative thereof. Specific examples of such a polyester include polyethylene terephthalate, polyethylene isophthalate,

—Polybutylene terephthalate, poly (1, 4—

 And polyethylene-1,2,6-naphthalene dicarboxylate. These copolymers or blends may be used. Among them, those comprising at least 70% by weight of ethylene based on the weight of the polyester are preferably made of ethylene terephthalate or ethylene 1,6-naphthalenedicarboxylate. Particularly, the processability of a biaxially oriented polyester film is preferred. From the viewpoint of transparency and transparency, polyester having ethylene terephthalate as a main repeating unit is preferable.

 Copolysynthetic components of polyesters whose main repeating unit is ethylene terephthalate include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, azelaic acid, and Examples thereof include aliphatic dicarboxylic acids such as basic acid and decane dicarboxylic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid. Examples of the diol component include alicyclic diols such as 1,4-butanediol, 1,6-hexanediol, aliphatic diols such as diethylene glycol, and 1,4-cyclohexanedimethanol, and bis-diols. Aromatic diols such as phenol A can be exemplified. These copolymer components may be used alone or in combination of two or more. Among these copolymer components, isophthalic acid is particularly preferred from the viewpoint of processability and transparency.

The proportion of the copolymer component depends on the type thereof, but is preferably a proportion that results in a melting point of the polymer of 230 to 258 ° C. If the melting point is lower than 230 ° C, heat resistance and mechanical strength may be poor. In the case of such a polyester, when ethylene terephthalate is used as the main repeating unit and the copolymer component is isophthalic acid, the ratio of azophthalic acid is set to 12 mol 1% or less based on the number of moles of the acid component. Good. Here, the melting point of the polyester is measured by a method in which a melting peak is obtained at a heating rate of 20 / min using DuPont Instrument 910 DSC. The sample amount is 2 O mg.

 The intrinsic viscosity (orthochlorophenol, 35 ° C.) of the polyester constituting the biaxially oriented polyester film of the present invention is preferably 0.52 to 1.5, more preferably 0.57. ~: L.0.0, particularly preferably 0.60 to 0.80. If the intrinsic viscosity is less than 0.52, the film-forming properties may be poor, which is not preferable. On the other hand, if the intrinsic viscosity exceeds 1.50, the molding processability may be impaired, the extruder may be overloaded, or the intrinsic viscosity may decrease significantly due to an excessive rise in the resin temperature. Not preferred.

 The polyesters described above can be produced by a method known per se, for example, by subjecting terephthalic acid, ethylene glycol and, if necessary, a copolymerization component (eg, isophthalic acid) to an esterification reaction, and then subjecting the resulting reaction product to To obtain a polyester by a polycondensation reaction until the degree of polymerization reaches a desired degree of polymerization, or a transesterification reaction of dimethyl ester terephthalate, ethylene glycol and, if necessary, a copolymer component (eg, dimethyl isophthalate). A method in which the obtained reaction product is subjected to a polycondensation reaction until a desired degree of polymerization is obtained to obtain a polyester can be preferably exemplified. Of course, if necessary, 2,6-naphthylenedicarboxylic acid for the acid component or 1,4-cyclohexanedimethanol for the glycol component can be used. The polyester obtained by the above method (melt polymerization) can be converted into a polymer having a higher degree of polymerization by a polymerization method in a solid state (solid state polymerization), if necessary.

 The polyester thus obtained is subjected to a film-forming method known per se, that is, a method in which the polyester is melted and then extruded from a linear die to form an unstretched film, which is stretched and heat-treated. It can be a biaxially oriented polyester film.

 The biaxially oriented polyester film of the present invention can contain an ultraviolet absorber.

In general, since optical films are mainly used indoors, there is no problem of inferiority due to ultraviolet rays. However, if it is used for a long period of time near a window, for example, Therefore, the deterioration of the film progresses, and the pigment gradually deteriorates and fades, sometimes lowering the contrast of the image. Therefore, it is a preferable embodiment to include an ultraviolet absorber in the biaxially oriented polyester film since deterioration of the polyester and the dye can be prevented. As the ultraviolet absorber, for example, the following formula (5)

( ^Wherein , X ^Q1 is a divalent aromatic residue in which the two bonds from X ^G1 represented by the above formula are in the 1-position and 2-position relations; n is 1, 2 Or 3; R ^Q1 is an n-valent hydrocarbon residue, which may further contain a heteroatom, or R ^Q1 can be a direct bond when n = 2.)

And the following equation (6)

(Wherein A is a group represented by the following formula (7) or

 , (8)

R ^Q2 and R ° ³ are the same or different and are monovalent hydrocarbon residues; X ^{Q 2} is a tetravalent aromatic residue, which further contains a heteroatom. May be contained. ) It is preferable to use at least one compound selected from the cyclic imino esters represented by the following formulas in an unreacted form. Such a cyclic imino ester is a compound known as an ultraviolet absorber, and is described, for example, in JP-A-59-12952. In the general formula (5), X ^Q1 is a divalent aromatic residue in which the two bonds from X ^Q1 represented by the formula (5) are in the first and second positions; n Is 1, 2 or 3;

R ^Q1 is an n-valent hydrocarbon residue, which may further contain a heteroatom, or R ^Q1 can be a direct bond when n = 2.

X ⁰¹ is preferably, for example, 1,2-phenylene, 1,2-naphthylene,

2, 3 _ naphthylene, following formula (9) (9)

(Wherein, R one O-, one CO-, - S-, one S0 ₂ -, one _{CH 2 _, - (CH 2} ) 2 - or a C (CH _{3) 2} - and it is.)

And the group represented by Of these, 1,2-phenylene is particularly preferred.

The aromatic residues exemplified for X ^Q1, for example an alkyl example when methyl having 1 to 10 carbon atoms, Echiru, propyl, hexyl, decyl and the like; Ari Le e.g. phenyl carbon number 6-12, naphthyl; number of carbon atoms 5 to 12 cycloalkyl such as pentyl pentyl, cyclohexyl and the like; aralkyl having 8 to 20 carbon atoms such as phenylethyl and the like; alkoxy having 1 to 10 carbon atoms such as methoxy, X toxic, decyloxy and the like; nitro; halogen such as It may be substituted with a substituent such as chlorine, bromine or the like; an acyl having 2 to 10 carbon atoms such as acetyl, proponyl, zenzyl, decanoyl and the like.

R ⁰¹ can be an n-valent (where n is 1, 2 or 3) hydrocarbon residue, or can be a direct bond only when n is 2.

As the monovalent hydrocarbon residue (when n = l), first, for example, an unsubstituted aliphatic group having 1 to 10 carbon atoms, an unsubstituted aromatic group having 6 to 12 carbon atoms, and 5 carbon atoms To 12 unsubstituted alicyclic groups. C1-C: Unsubstituted aliphatic groups having L0 include, for example, methyl, ethyl, propyl, hexyl, decyl and the like; unsubstituted aromatic groups having 6-12 carbons include, for example, phenyl, naphthyl, Examples of the unsubstituted alicyclic group having 5 to 12 carbon atoms include cyclopentyl and cyclohexyl.

In addition, as the above monovalent hydrocarbon residue, secondly, for example, the following formula (10)

(Wherein, R ^Q4 is alkylene, phenylene, or naphthylene having 2 to 10 carbon atoms.)

A group represented by the following formula (11)

(In the formula, 1 ^ ⁵ is an alkyl group having 1 to 0 carbon atoms, a phenyl group or a naphthyl group.)

A group represented by the following formula (12)

(Wherein definitions of R ^Q4 and R ^Q5 is as defined above, R ^Q6 is any of the groups defined for hydrogen atom or R ^{0 5.)} _

A group represented by the following formula (13)

(Wherein the definitions of R ^Q4 and R ^G6 are the same as above, and 1 ^ ⁷ is either a hydrogen atom or a group defined as 1 ^ ^5. ) And a substituted aliphatic residue or aromatic residue represented by

Moreover, as the monovalent hydrocarbon residue, in the third, is substituted by the same substituents as the aromatic residue of the unsubstituted, for example, exemplified as the substituent of the aromatic residues representing said X ⁰¹ Can be mentioned. Therefore, examples of substitution with such a substituent include, for example, tolyl, methylnaphthyl, nitrophenyl, nitronaphthyl, chlorophenyl, benzoylphenyl, acetylphenyl or acetylnaphthyl.

 As the monovalent hydrocarbon residue, a group represented by the above formula (10), (11), (12) or (13), that is, a substituted aliphatic residue or aromatic residue, Preferred are aromatic residues.

 As divalent hydrocarbon residues (when n = 2), first, for example, divalent, unsubstituted aliphatic residues having 2 to 10 carbon atoms, unsubstituted aromatics having 6 to 12 carbon atoms Group, an unsubstituted alicyclic group having 5 to 12 carbon atoms.

 Examples of the divalent unsubstituted aliphatic group having 2 to 10 carbon atoms include ethylene, trimethylene, tetramethylene, and decamethylene.Examples of the unsubstituted aromatic residue having 2 to 6 carbon atoms include divalent unsubstituted aromatic groups. Examples include phenylene, naphthylene, P, P'-biphenylene, and the like. Examples of the divalent unsubstituted alicyclic group having 5 to 12 carbon atoms include, for example, cyclopentylene, cyclohexylene, and the like. .

Also, as the divalent hydrocarbon residue, secondly, for example, the following formula (1)

(Wherein R ^Q8 is any of the groups defined for R ^Q4 .)

Or a group represented by the following formula (15)

(Wherein, the definition of R ^{Q 8} is the same as above, and R ^Q9 is any of the groups defined for R ^Q4 And R. ^1Q is any of the groups defined in ^RQ6 . )

And a substituted aliphatic residue or aromatic residue represented by

Further, as the divalent hydrocarbon residue, a third, a divalent aromatic residue of the non-substituted, for example by the same substituents as exemplified as the substituent for the aromatic group represented by the X ⁰¹ Substituted ones can be mentioned.

When n is 2, R ^fll is preferably a direct bond or an unsubstituted or substituted divalent aromatic hydrocarbon residue of the above-described first to third groups. Unsubstituted or substituted aromatic hydrocarbon residues of the first or third group in which the bond comes from the furthest position are preferred, especially p-phenylene, p, p, -biphenyl Rene or 2,6-naphthylene is preferred.

 Examples of the trivalent hydrocarbon residue (when n = 3) include, for example, a trivalent aromatic residue having 6 to 6 carbon atoms: L 2.

 As such an aromatic residue, for example, the following formula (16)

And the like.

 Such an aromatic residue may be substituted with the same substituent as exemplified as the substituent for the monovalent aromatic residue.

In the above general formula (5), R ⁰² and R ⁰³ are the same or different and are monovalent hydrocarbon residues, and X ⁰² is a tetravalent aromatic hydrocarbon residue.

The R ⁰² and R ^03, may be mentioned in the description of the formula (I), the same groups as exemplified for R ^{0 1} in the case of n = l as an example.

As the tetravalent aromatic hydrocarbon residue, for example, the following formula (17)

(Here, the definition of R ⁰ is the same as equation (9).)

And the group represented by

 The tetravalent aromatic residue may be substituted with the same substituent as that exemplified for the trivalent aromatic residue representing the length in the description of the above formula (5).

 Specific examples of the cyclic iminoester represented by the above formulas (5) and (6) used in the present invention include the following compounds.

 Compound of the above formula (5) when n = l

2-Methyl-3,1 benzoxazine-1 4-one, 2-butyl-3,1 benzoxazine-1 4-one, 2-phenyl-3,1 benzoxazine-1,4-one, 2- (1 1- or 2-naphthyl) 1,3,1 Benzoxazine 1-one, 2- (4-biphenyl) 1,3,1-Benzoxazine 1-41-one, 2-p-Nito-mouth phenyl 3,1,1 Nzoxazine 1-one, 2-m-Nitrophen-2,3,1-Benzoxazine 1-4-one, 2-p-Benzoyl-phen-3,1-1 Benzoxazine 1-41-on, 2-p-Methoxyx2 3, 1-Benzoxazin-1 4-one, 2-o-Methoxyphenyl 3, 1-Benzoxazine 1-4-one, 2-Cyclohexyl-3,1-benzoxazine-1 4-one, 2-p- (Or m—) phthalimide phenyl 2,1-benzoxazine—41 on, N—phenyl 4— (3,1 benzoxazine-14-on—2-yl) phthalimide, N-benzoyl 1-41 (3,1 Benzoxazine-1-4-one-2-yl) aniline, N-benzoyl-1-N-methyl-14- (3,1-benzoxazine-4-1-one-2-yl) aniline, 2— (p— (N-methylcarbonyl) phenyl) 1,3,1-benzoxazine-14-one.

 Compound of the above formula (5) when n = 2

 2,2,1-bis (3,1-benzoxazine-1-one), 2,2,1-ethylenebis (3,1-benzoxazin-1-one), 2,2,1-tetramethylenebis (3,1 —Benzoxazine-1 4-one), 2, 2 '—Decamethylenebis (3,1-benzoxazine-1 41-one), 2, 2' —p-Phenylenebis (3,1-benzoxazine) —4-one ), 2,2'-m-phenylenebis (3,1_benzoxazine-1 4-one), 2,2,1- (4,4, diphenylene) bis (3,1-benzoxazine-1-4one) ), 2,2 '-(2,6- or 1,5-naphthylene) bis (3,1-benzobenzoxazine-one), 2,2,1- (2-methylphenylene) bis (3,1 1,2,1- (2-nitro-p-phenylene) bis (3,1-benzoxazine-1 4-one), 2,2,1- (2-k P-phenylene) bis (3,1-benzoxazine-4-one), 2,2,1- (1,4-cyclohexylene) bis (3,1-benzoxazine-1-one), N-P -(3,1 Benzoxazine-1 4-one-1-2-yl) phenyl, 4- (3,1-Benzoxazine- 4-one-1-2-yl) phthalimide, NP- (3,1 Benzoxazine) 4-one—2-yl) benzoyl, 4-one (3,1-benzoxazine-41-one-2-yl) aniline.

 Compound of the above formula (5) when n = 3

1,3,5-tri (3,1 benzoxazine-1 4-one-on-2-yl) Benzene, 1,3,5-tri (3,1-benzoxazine-1 4-1-on-2-yl) ) Naphthalene, 2,4,6-tri (3,1 benzoxazin-14-one-1 2- ^ Γ) Compound of the above formula (6)

2,8-Dimethyl-4H, 611-Venzo (1,2-d; 5,4-d ') Bis (1,3) -oxazine-4,6-dione, 2,7-Dimethyl-4H, 9H-Venzo (1,2-d; 4,5-d ') bis (1,3) -oxazine- 1,4,9-dione, 2,8-diphen-4u 4H, 8H-Venzo (1, 2-d; 5,4-d,) bis (1,3) -oxazine-1,4,6-dione, 2,7-diphenyl-4H, 9H-benzo (1,2-d; 4,5- d ') Bis (1, 3) -oxazine-1,4,6-dione, 6,6' Bis (2-methyl-4H, 3,1-benzoxazin-1-one), 6,6, —bis (2 —Ethyru 4 H, 3,1-Benzoxazine—4-one), 6,6, bis (2-Fenru 4H, 3,1 Benzoxazine—1-one), 6,6, Me Tylenebis (2-methyl-4H, 3,1 -benzoxazine-1 4-one), 6,6'-methylenebis (2-phenyl-4H, 3,1-ben) Oxazine 1 4-one), 6, 6'-Ethylenebis (2-methyl-4H, 3, 1-benzoxazine 1 4-one), 6, 6, 1-Ethylenebis (2-phenyl-4H, 3, 1) —Benzoxazine-4-one), 6, 6 '—butylenebis (2-methyl_4H, 3,1benzoxazine-1 4-one), 6, 6' —butylenebis (2-phenylene 4H, 3,1) 1-benzoxazine-1 4-one), 6,6'-oxybis (2-methyl-4H, 3,1-benzoxazine-1 4-one), 6,6'-oxybis (2-phenyl-4H, 3,1_benzoxazine) 1,4'one), 6,6'-Sulfonylbis (2-methyl-1 4H, 3,1'-benzoxazine--4'one), 6,6'-Sulfonylbis (2'-Fe2L4H, 3,1'1) Benzoxazine-1 4-one), 6,6'-Liponyl bis (2-methyl-4H, 3,1-benzoxazine-1 4- On), 6,6,1-carbonylbis (2-phenyl-4H, 3,1-benzoxazine-1 4-one), 7,7, -methylenebis (2-methyl-4H, 3,1-benzoxazine-1-4 7,7'-Methylenebis (2-phenyl-4H, 3,1-benzoxazin-4-one), 7,7'-bis (2-methyl-4H, 3,1benzoxazine) 4,7-one-oxybis (2-methyl-4H, 3,1-benzo), 7,7,1-ethylenebis (2-methylene-4H, 3,1_benzoxazine) Oxazine-one),, 7, -sulfonylbis (2-methyl-4H, 3,1 benzoxazin-4-one), 7,7'-Ruponylbis (2-methyl-4H, 3,1-benzoxazine-1-4) _On), 6,7, -bis (2-methyl-4H, 3,1-benzoxazine-1 4-one), 6,7, -bis (2-phenyl-4H, 3,1 benzoxazine-1 4 —On), 6,7, -methylenebis (2-methyl_4H, 3,1-benzoxazin-14-one), 6,7'-methylenebis (2-phenyl-4H, 3,1-benzobenzoxazine-1-one) .

 Among the above exemplified compounds, the compound of the above formula (5), more preferably the compound of the above formula (5) when n = 2, particularly preferably the following formula (18)

(18)

(In the formula, R ^{Q 11} is a divalent aromatic hydrocarbon residue.)

The compound represented by is advantageously used.

 Among the compounds of the formula (18) are, among others, 2,2′-p-phenylenebis (3,11-benzoxazine-14-one), 2,2 ′ — (4,4,1-diphenylene) bis ( Preferred are 3,1 benzoxazine and 4-one) and 2,2 '-(2,6-naphthylene) bis (3,1 benzoxazine).

The UV-absorbing properties of these cyclic imino esters are described in, for example, JP-A-59-12952, which are representative compounds thereof, which are incorporated herein by reference. The cyclic imino ester has excellent compatibility with the polyester, but has the ability to react with the terminal hydroxyl group of the polyester as described in JP-A-59-12952 and US Pat. No. 4,291,152. Having. Therefore, it is necessary to carefully mix the cyclic imino ester and the polyester so that the cyclic imino ester is contained in a substantially unreacted state. However, as the polyester, the main proportion of the terminal group is a carboxyl group polyester or the terminal hydroxyl group is blocked with a terminal blocking agent that is not reactive with the cyclic imino ester. When polyester is used, no special precautions need to be taken to produce a composition containing the cyclic imino ester in an unreacted state. In the case of using a polyester having a major proportion of hydroxyl groups as terminal groups, the melt mixing time is calculated by the following two formulas.

 1 o g t≤- 0.0 .08 T +4.8

 Tm <T <3 2 0

 (Where t is the melt mixing time (seconds), T is the melt mixing temperature CO and Tm are the polyester melting temperatures (° C).)

It is desirable to complete it in a short time so that In this case, the cyclic imino ester and the polyester may react at a small ratio.However, this reaction increases the molecular weight of the polyester.According to this ratio, it is possible to prevent a decrease in the molecular weight due to the deterioration of the polyester due to the light absorbing agent. Is possible. When the cyclic iminoester reacts with the polyester, the ultraviolet absorption wavelength region generally shows a tendency to shift to a lower wavelength side than the unreacted ultraviolet absorption wavelength region, and therefore transmits the higher wavelength ultraviolet light. Have a tendency to

 When the cyclic imino ester is added in an appropriate amount, there is almost no sublimation, so that the periphery of the die is not stained by the film formation, and it absorbs the light near the wavelength of about 180 nm from ultraviolet rays, so that the film is not colored and visible light Excellent in preventing deterioration of absorbents and films.

 The amount of the ultraviolet absorber added is preferably 0.1 to 5% by weight, more preferably 0.2 to 3% by weight, based on the polyester. If the amount is less than 0.1%, the effect of preventing ultraviolet light deterioration is small, while if it exceeds 5% by weight, the film-forming properties of the polyester deteriorate, which is not preferable.

The above-mentioned ultraviolet absorber is preferably added at the time of polymerization of polyester or at the time of melt extrusion, and it is particularly preferable to add the ultraviolet absorber in the form of master pellets. In addition, in the process of producing the polyester used in the present invention or in the subsequent process of extruding from the die, if necessary, further, an antioxidant, a heat stabilizer, a viscosity adjuster, a plasticizer, a hue improver, Additives such as lubricants, nucleating agents, antistatic agents, antioxidants, and catalysts can be added. Suitable lubricants for the above polyester Such a roughening substance (filament) can be contained. As the filler, those conventionally known as a slipperiness imparting agent for a polyester film are used. Examples include calcium carbonate, calcium oxide, aluminum oxide, aluminum oxide, silicon oxide, zinc oxide, carbon black, silicon carbide, tin oxide, crosslinked acrylic resin particles, crosslinked polystyrene resin particles, melamine resin particles. And cross-linked silicone resin particles. Among these, porous silica having an average particle size of l to 3 / m is preferred because it is easy to obtain slipperiness while maintaining transparency. The addition amount of the porous silica is preferably from 0.01 to 0.005% by weight from the viewpoint of transparency and slipperiness. In addition, the thickness of the biaxially oriented polyester film of the present invention is preferably 50 m or more because the scattering of glass can be easily suppressed in the event that the CRT is imploded. The upper limit of the thickness of the biaxially oriented polyester film is preferably 250 or less because the haze value is easily maintained at 5% or less and the productivity of the film is good.

 Further, the biaxially oriented polyester film of the present invention preferably has a heat shrinkage in the longitudinal direction and width direction of 2% or less, respectively, when treated at 150 ° C. for 30 minutes, more preferably. The heat shrinkage is 0 to: 0.5%. If the above heat shrinkage exceeds 2%, it is not preferable because flattening is likely to occur due to thermal deformation in the vapor deposition process when forming the optical laminate, particularly when forming the antireflection layer.

 The biaxially oriented polyester film of the present invention is a base film for a laminated film for laminating an image display surface.

 Next, the adhesive film of the present invention in which an adhesive layer is provided on at least one surface of the above-mentioned biaxially oriented polyester film will be described in detail.

 The adhesive film of the present invention can be positioned as an intermediate product for producing a laminated film for laminating an image display surface. The laminated film for bonding the image display surface will be described later.

The adhesive layer constituting the adhesive film of the present invention is preferably composed of a composition mainly composed of an aqueous polyester and an amide of a fatty acid and Z or a bisamide of a fatty acid. The glass transition point (Tg) of the aqueous polyester forming the adhesive layer is preferably from 40 to 85 ° C, more preferably from 45 to 80 ° C. Water-based polyester When the glass transition point (Tg) is less than 40 ° C, the obtained film tends to have low heat resistance and low blocking resistance. On the other hand, when the Tg of the water-based polyester exceeds 85 ° C, the effect of improving the adhesiveness becomes poor. The aqueous polyester referred to here is a polyester soluble or dispersible in water. Specifically, terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4-diphenyldicarboxylic acid, phenylindanedicarboxylic acid, adipic acid, sebacin Acids, 5-Na sulfoisophthalic acid, trimellitic acid, dimethylol propionic acid, etc., and sulfonic acid components and ethylene glycol, diethylene glycol, neopentyl diol, 1,4-butanediol, 1,6- Polyesters produced from hydroxy compound components such as hexanediol, 1,4-six-mouth hexanedimethanol, glycerin, trimethylolpropane, and alkylene oxide adducts of bisphenol A can be mentioned. Further, the aqueous Polje ester further if it is necessary to impart affinity for water may be introduced S0 ₃ N a group or COON a group in the polyester and to introduce the polyether component Rukoto Can also.

Amides of fatty acids or bisamis of fatty acids

Or C〇NHR ₃ NHOCR ₂ and 1 ^ (30— ぉ 1 ₂ (: 0_ is a fatty acid residue, and 1 NHR ₃ NH— is a diamine residue. Is preferably a saturated or unsaturated fatty acid having 6 to 22 carbon atoms, and the diamine is preferably a diamine having 1 to 15 carbon atoms, particularly an alkylenediamine. Preferred is N, N'-alkylenebisamide having a molecular weight of 200 to 800. More specifically, N, N'-methylenebisstearic acid amide, N, N'-ethylenebispalmitic acid amide, N, N, -methylene Bislauric acid amide, linoleic acid amide, caprylic acid amide, stearic acid amide and the like can be exemplified, and among these, the bisamide represented by the following formula is particularly preferable.

RCONH (CH ₂ ) _n NHOCR

(However, RCO— indicates a fatty acid residue, and n is 1 or 2.) These fatty acid amides and z or fatty acid bisamides are preferably contained in the composition for forming a coating film in an amount of 3 to 10% by weight. When the content of fatty acid amide and / or Z or fatty acid bisamide is too small, sufficient adhesive strength cannot be obtained, and slipperiness and blocking resistance tend to be reduced. The adhesiveness between the coating film and the adhesive for glass decreases, the coating film becomes brittle, and the haze tends to increase.

 The coefficient of friction of the adhesive layer in the present invention is preferably 0.8 or less, and more preferably 0.6% or less. If the friction coefficient of the adhesive layer exceeds 0.8, the winding property and the workability are poor, and it is difficult to perform a smooth film formation and processing. As a means for forming an adhesive layer having such a friction coefficient, a roughened substance having an average particle size of 0.15 m or less, particularly 0.01 to 0.1 zm, is used in the coating film of the adhesive layer. May be included. Specific examples of the surface roughening substance include calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, Inorganic fine particles such as tin oxide, antimony trioxide, force pump rack, molybdenum disulfide, etc., acrylic cross-linked polymer, styrene cross-linked polymer, cross-linked silicone resin, fluoro resin, benzoguanamine resin, phenol resin, nylon resin, Organic fine particles such as polyethylene wax can be used. Among these, it is preferable to select ultrafine particles having a specific gravity of not more than 3 in order to avoid sedimentation of the water-insoluble solid substance in the aqueous dispersion.

These surface-roughening substances roughen the surface of the coating film, and also have the effect of reinforcing the coating film with the fine powder itself, as well as the effect of imparting blocking resistance to the coating film and imparting lubricity to the laminate. It works. The preferable addition amount of the surface roughening material is 5 to 30% by weight in the composition for forming a coating film. In particular, when relatively large particles having an average particle size of 0.1 or more are used, the range is 5 to 10% by weight. When particles having an average particle size of 0.01 to 0.1 m are used, 8 to 3% by weight is used. It is preferable to select from the range of 0% by weight. If the content of these roughened materials is too large, the haze value of the obtained laminate exceeds 3%, and the transparency is increased. Care must be taken, as is easy to get worse. Also, roughening substances The center line surface roughness (R a) of the slippery adhesive layer to which is added is preferably 2 to 10 nm. If Ra is less than 2 nm, it is difficult to attain the above-mentioned coefficient of friction, and the winding form becomes poor due to insufficient slippage during winding of the laminate, which hinders subsequent operations. On the other hand, if the Ra of the adhesive layer exceeds 1 O nm, the transparency deteriorates, and the haze tends to exceed 5%.

 The adhesive layer in the present invention may be formed by applying an aqueous solution, an aqueous dispersion or an emulsion of the composition comprising the above-mentioned aqueous polyester and fatty acid amide and / or fatty acid bisamide to a roll coating method, a gravure coating method, a mouth-to-brush method, It can be preferably formed by a spray coating method, an air knife coating method, an impregnation method, a curtain coating method, or the like. Further, in order to form a coating film, a resin other than the aqueous polyester, a surface roughening substance, an antistatic agent, a surfactant, an ultraviolet absorber, and the like can be added as necessary. The application of the coating solution to the biaxially oriented polyester film can be performed at any stage, and is preferably performed during the film forming process of the biaxially oriented polyester film. It is preferable to apply at the stage until completion. Here, the stage until the completion of the crystal orientation means the unstretched film, the uniaxially oriented film in which the unrolled intermediate film is oriented in either the longitudinal direction or the lateral direction, and furthermore, the two directions of the longitudinal and lateral directions. Orientation-oriented low-magnification orientation (biaxially oriented film before it is finally re-stretched longitudinally or laterally to complete oriented crystallization). Of these, it is preferable to apply the coating solution of the above composition to a uniaxially oriented film that has been oriented in one direction, and then to carry out lateral stretching and heat fixing as it is, and to obtain the slipperiness thus obtained. The adhesive layer exhibits strong bonding strength with the biaxially oriented polyester film of the base film. If necessary, the coating film may be formed on only one side of the film, or may be formed on both sides. The coating amount of the coating solution is preferably 70 to 100 It is preferred that the amount be in the range of nm, more preferably in the range of 75-95 nm. If the thickness of the coating film is less than 70 nm, the adhesive strength tends to be insufficient, and if it is too thick and exceeds 10 O nm, blocking may occur or the haze value may increase.

Also, when applying the coating solution to the film, take preparatory steps to improve coatability. It is preferable to apply a physical treatment such as a corona surface treatment, a flame treatment, or a plasma treatment to the coated surface in advance, or to use a chemically inert surfactant together with the coating composition. This surfactant promotes wetting of the aqueous coating liquid on the polyester film. For example, polyoxyethylene alkyl phenyl ether, polyoxyethylene monofatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal stone, alkyl sulfate, alkyl sulfonate, alkyl sulfonate, etc., nonionic, nonionic Surfactants.

By the way, the coating liquid may contain an ionic low molecular compound depending on the presence of impurities in the raw material. The ionic low molecular compound referred to here is one S〇 ₃

X ^1, -coox ^1, - substances having a PO ₄ X one NO- X ¹ (X ¹ represents an alkali metal or Anmoniumu groups in formula) Molecular weight 1 0 0 0 The following ionic functional group represented by like It is. If the ionic low-molecular compound is present in the adhesive layer in excess of 1000 ppm, the coating liquid wets the biaxially oriented polyester film when the aforementioned coating liquid is applied to the biaxially oriented polyester film. In addition, it is difficult to obtain a coating film having a constant thickness, and the adhesiveness to the adhesive is apt to decrease. The detection of the zwitterionic low-molecular compound can be performed by forming a coating film on the film surface and analyzing the surface of the coating film by XPS (X-ray photoelectron spectroscopy).

The adhesive film of the present invention uses the adhesive layer as the back surface (in the case of double-sided application, any single surface), and transmits light in the visible light region from the side of the biaxially oriented polyester film at an angle of 45 degrees to the surface. When incident, the reflectance at the interface between the adhesive layer and the biaxially oriented polyester film (hereinafter sometimes referred to as the back surface reflectance) is preferably 0.4% or less. When the backside reflectance exceeds 0.4%, the effect on frontside reflection cannot be ignored, and when used as an optical laminate for antiglare films for displays, the reflection of extraneous light is caused by interference between frontside reflection and backside reflection. It becomes obscured with a rainbow pattern, which easily impairs visibility. In order to make the back surface reflectivity 0.4% or less, the refractive index (nz) in the thickness direction of the coating film is preferably set to 1.50 to: L.60. If nz deviates from the above range, the backside reflection in the visible light region tends to exceed 0.4%. Also, the refractive index is If the ratio exceeds the range, the effect of back surface reflection becomes apparent, and in the case where an anti-reflection layer described later is provided, there may be a problem that it becomes difficult to prevent reflection. The easy-adhesive film thus obtained has excellent surface slipperiness and adhesiveness, but also has a clear hue contrast and is excellent in transparency.

 When the optical laminate of the present invention is used after being bonded to a display such as a CRT, a second adhesive film is formed on one surface of the adhesive film of the present invention having the first adhesive layer formed on both surfaces. And a hard coat layer laminated on the other surface. The laminated film of the present invention will be described in detail below.

 The laminated film of the present invention is obtained by laminating a hard coat layer on the first adhesive layer, whereby the abrasion resistance of the laminated film of the present invention can be improved. As the node coat layer, a radiation-curable or silane-based resin can be used. In particular, a hard coat layer using a radiation-curable resin is preferable, and among them, an ultraviolet (UV) A hard coat layer using a resin is preferable. Examples of the UV curable composition used for forming the hard coat layer include UV curable compositions such as urethane acrylate, epoxy acrylate, and polyester acrylate. In order to laminate the hard coat layer on the first adhesive layer of the laminate, the composition is applied on the adhesive layer, and the composition is cured by heating, irradiation with radiation (for example, ultraviolet rays), or the like. Good. The thickness of the hard coat layer is not particularly limited, but is preferably in the range of 1 to 15 m.

In the laminated film of the present invention, it is preferable to further form a multiple antireflection layer on the hard coat layer thus formed. The multiple anti-reflection layer is formed by alternately laminating a plurality of layers having different refractive indexes, and the configuration is generally well known. For example, low refractive index layer (S i〇 ₂ , 3 O nm) high refractive index layer (T i〇 ₂ , 3 O nm) low refractive index layer (S i 0 ₂ , 30 nm) —high refractive index rate layer (T I_〇 _2, 1 0 0 nm) - having a layer structure of a low refractive index layer _{(S i 0 2, 1 0} O nm), a high refractive index layer (IT_〇, 2 O nm) - low Refractive index layer (A 1 S i0, 20 nm) — High refractive index layer (I 8, 88 η m) and low refractive index layer (A l S i 〇, 88 nm) , High refractive index conductive layer (IT〇, 2 O nm) One low refractive index layer (S i〇 ₂ , 2 O nm)- Layer (IT_〇, 93 nm) such as those having a layer structure of one low refractive index layer (S I_〇 _2, 93 nm) are known. As a method for forming the anti-reflection layer, any method can be adopted, and for example, the layers may be laminated by sputtering. With the multiple anti-reflection layer, the laminated film of the present invention can suppress the reflection of extraneous light that hinders the visibility of the display. In addition to these, the anti-reflection layer includes a single-layer film which mainly prevents yellow light from being mainly reflected, but a multilayer anti-reflection film is more suitable for preventing reflection of a display.

 In the laminated film of the present invention, the second adhesive layer is laminated on a surface different from the side on which the hard coat layer is formed. In the case of laminating the second adhesive, a biaxially oriented polyester film is also used. In order to improve the adhesiveness of these, it is preferable to laminate them via a first adhesive layer. Example

 Hereinafter, the present invention will be described in more detail with reference to Examples. Each characteristic value in the examples was evaluated by the following methods.

 (1) Haze value

 The haze value was measured using a haze meter (NDH-20) manufactured by Nippon Denshoku Industries Co., Ltd. The haze value was evaluated according to the following criteria.

 4: Haze value ≤ 2.0% …… Extremely good haze value,

3: 2.0% <Haze value ≤ 3.0% …… Good haze value,

 2: 3.0% haze value ≤5.0% …… Haze value is slightly good

1: 5.0% haze value .... haze value defect.

 (2) Average transmittance

 The transmittance of visible light having a wavelength of 450 to 650 ηm was measured using a spectrophotometer MP C3100 manufactured by Shimadzu Corporation.

 ©>: Average transmittance of wavelength 450 ~ 65011111 0 ^ ¥) 0.50 or more, 0.70 or less,

〇: Average transmittance (Tav) of wavelength 450-65011111 is 0.40 or more and 0.50 or less Full or 0.70 to 0.80 or less,

 X: Average absorbance (Aav) at a wavelength of 400 to 750 nm is less than 0.40 or more than 0.80,

 (3) transmittance at each wavelength

The transmittance (T i) at each wavelength i from 450 to 650 nm was measured according to the above-mentioned method for measuring absorbance. The obtained results were evaluated by the following methods.

◎: 0.8≤T i / Tav≤l.2 range,

 〇: 0.7 ≤ Ti / Ta ν <0.8 or 1.2 <Ti / Tav ≤ l.3, X: TiZTav く 0.7 or Ti / Ta ν> 1.3 range,

 (4) Contrast

 The test CRT is illuminated with a 30W fluorescent lamp from above 45 °, and the maximum and minimum luminance on the screen is measured with a luminance meter (Minol Yu) at 30 ° above horizontal, where specular light is not directly incident. , Contrast 1 (highest luminance, lowest luminance). Next, the test sample was attached to a CRT with an adhesive, and the highest luminance and the lowest luminance were measured again, and the contrast 2 was obtained.

A value of 100% was evaluated in the following categories.

X 100% is 120% or more, 〇: (Contrast 2 Z Contrast 1) X 100% is 100% or more and less than 120%,

X: (Contrast 2 / Contrast 1) X 100% is less than 100%,

 (5) Saturation

 L *, a *, and b * in the L * a * b * color system were determined from the transmission spectrum of the test film with respect to the standard light A in accordance with JIS Z 8729. The chroma deviation from the achromatic color was evaluated using the ab chroma (C * ab) obtained from the following equation.

©: C * ab is less than 5

 〇: C * ab is 5 or more and less than 10

X: C * ab is 10 or less C * ab = J (a *) ² + (b *) ²

 (6) Backside reflectance

 When the surface of the adhesive layer of the adhesive film is the back side (or one side in the case of double-sided application), when a point light source is irradiated at an angle of 45 ° from the film surface, and the film thickness is d from the main reflection The reflected light separated by dZO. 707 is defined as the backside reflection, and this is divided by the amount of light from the point light source to obtain the reflectance. This was evaluated according to the following criteria.

〇: Backside reflectance is 0.4% or less

X: Backside reflectance is more than 0.4%

 (7) Adhesive strength

a. Adhesive

 Apply an acrylic adhesive with a thickness of 10 m on the surface of the adhesive layer of the adhesive film. After 24 hours in a thermo-hygrostat at 60 ° C and 80% RH, bond with epoxy resin adhesive and evaluate by peeling test according to the following criteria.

◎: Adhesive strength is strong enough to break base film

〇: Peeled, but practical

 X: Easy peeling, no practicality

b. Hard court

 A hard coat layer with a thickness of 5 m is formed on the adhesive layer of the adhesive film, cross-cut in a grid (1), 100 squares of 11111, and a 24-mm cellophane tape (Nichiban) (Manufactured by the company) and abruptly peeled off at a peeling angle of 180 °. The peeled surface was observed and evaluated according to the following criteria.

 5: Peeling area is less than 10% .... Excellent adhesive strength

 4: Peeling area is 10% or more and less than 20% .... Good adhesive strength

 3: Peeling area is 20% or more and less than 30% ... Slightly good adhesive strength

2: Peeling area is 30% or more and less than 40% ... Poor adhesive strength

 1: Peeling area exceeds 40% .... Adhesive strength is extremely poor.

 (8) Detection of ionic low molecular compounds

The surface of the adhesive layer of the adhesive film is analyzed by XPS (X-ray photoelectron spectroscopy). According to the result, it is displayed as follows.

 〇: The content of ionic low-molecular compounds is 1000 ppm or less

X: The content of ionic low molecular compounds exceeds 1000 ppm

 (9) Film / film friction coefficient

Place the fixed glass on the lower side of the two film samples with the front and back superimposed and take off the film on the lower side of the superposed film (the film in contact with the glass plate) with a constant speed roll (10 cmZ), fix the detector to one end of the upper film (the end opposite to the direction in which the lower film is pulled out), and detect the tensile force (F) between the films. The thread placed on the upper film used at that time has a lower surface area of 50 cm ² (8 OmmX 62.5 mm), and the surface that contacts the film is neoprene rubber with a hardness of 80 ° and its weight. (W) shall be 1.2 kg. The static friction coefficient (iS) is calculated by the following equation.

 . F (g)

 W (g)

 (10) Refractive index in the thickness direction of the easily adhesive layer

 The measurement was performed using an Abbe refractometer with sodium D line as a light source. The mounting solution was methylene iodide, and the measurement atmosphere was 25 ° C and 65% RH.

(11) Evaluation of surface reflection as a visibility improving film

 Irradiate 700 1X external light to the test CRT that does not emit light, and measure the reflected luminance 1 with a luminance meter (Minolta). Next, the test film was attached to a CRT with an adhesive, and the reflection luminance 2 was measured again. (Reflection luminance 2 Z reflection luminance 1) The value of XI 00% was evaluated in the following categories.

 ◎: (Reflection luminance 2Z Reflection luminance 1) X I 00% is less than 20%

（(Reflection luminance 2Z reflection luminance 1) XI 00% is 20% or more and less than 30%

Δ: (reflection luminance 2Z reflection luminance 1) X 100% is 30% or more and less than 40%

X: (reflection luminance 2Z reflection luminance 1) X 100% is 40% or more

 (12) Wear resistance as a film with improved visibility

Specimen was coated with steel wool # 000 on square pad (area 6.25 cm ² ) ί Then, the difference between the haze values before and after the abrasion test (load l kg, 50 reciprocations) using a reciprocating abrasion tester was evaluated as follows.

ΔHaze = (Haze value after abrasion test) I (Haze value before abrasion test)

〇: Δ haze is less than 10

Δ: Δ haze is 10 or more and less than 20

X: Δ haze exceeds 20

 (13) Heat shrinkage

 The film is kept in hot air of 150 ° C for 30 minutes, and the dimensional change before and after in the longitudinal direction and the width direction of the film is obtained from the following formula.

 Heat shrinkage (%) = (L. One L) ZLX 100

 (14) Surface roughness

 Measure with a contact surface roughness meter (SURFCORDER SE-30C) of Kosaka Laboratory Co., Ltd. in accordance with the method of measuring the center line average roughness (Ra) of JIS-B0601. The measurement conditions are as follows.

Stylus tip radius: 2 shines

Measuring pressure: 3 Omg

Cut off: 0.25mm

Measuring length: 2.5 mm

How to summarize the data: Repeat the measurement for the same sample 6 times. Excluding the largest one, display the average of the remaining five data.

 (15) Flatness after processing of anti-reflection layer

 The flatness of the optical laminate after processing the anti-reflection layer (wrinkles, transfer, scratches due to rubbing, poor flatness of the film) and the presence of poor flatness due to thermal deformation of the optical laminate were evaluated in three steps. .

〇: good

 △: Can be used (partly defective)

 X: Unavailable

(16) Light degradation resistance Using the Toyo Seiki Co. xenon © E The meter, the light of a wavelength of 300 to 800 nm to the sample films were irradiated at an irradiance 765WZm ² 100 hours, including tristimulus values (luminous transmission before and after irradiation ), Lab (chromaticity coordinates), and YI (yellowing degree) are measured using a colorimeter (SZS-∑90 manufactured by Nippon Denshoku Industries Co., Ltd.) and evaluated according to the following criteria. 〇 has no problem for indoor use, and ◎ has a level of light deterioration resistance that is not a problem for indoor and outdoor use.

 ：: Change in luminous transmittance within 3% and yellowing degree within 4

 O: The change in luminous transmittance exceeds 3% and the degree of yellowing or yellowing exceeds 4 Example 1

 Polyethylene terephthalate containing 0.03% by weight of Dainichi Seika's carbon black pigment and 0.007% by weight of porous silica having an average particle size of 1.7 (35 ° C-ortho-chlorophenol) The intrinsic viscosity [77] = 0.65) was extruded in a molten state from a die, and cooled by a cooling drum by a conventional method to obtain an unstretched film. Subsequently, the unstretched film is continuously stretched without being wound up, and then stretched at a stretch ratio of 3.5 while heating to 9 O in the longitudinal direction, and stretched at a stretch ratio of 3.5 while heated to 95 ° C in the transverse direction. After stretching at a magnification of .times.8, the film was subjected to a tension heat treatment at 230.degree. C. to obtain a biaxially oriented polyester film having a thickness of 75 m. Table 1 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Example 2

 The same operation as in Example 1 was repeated except that the thickness was changed to 200 m, and the amount of the pigment and the amount of addition were changed to 0.03% by weight of kaya set B lack AN (dye) manufactured by Nippon Kayaku. Was. Table 1 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Example 3

Polyethylene naphthalate containing 0.04% by weight of Dainippon Seika's car pump rack pigment and 0.007% by weight of porous silica with an average particle size of 1.7 m (35 ° C—intrinsic viscosity by orthochlorophenol) [77] = 0.62) was extruded in a molten state from a die, and cooled with a cooling drum by a conventional method to obtain an unstretched film. Then, The unstretched film is continuously stretched without being wound, stretched at a stretch ratio of 3.5 while heating to 140 ° C in the longitudinal direction, and stretched to 135 ° C in the transverse direction. After stretching at a magnification of 3.8, the film was subjected to a tension heat treatment at 230 ° C. to obtain a biaxially oriented polyester film having a thickness of 50 m. Table 1 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Example 4

 The same operation as in Example 3 was repeated except that the thickness was changed to 75 m, and the dye and the amount of the dye were changed as shown in Table 1. Table 1 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Comparative Examples 1 to 5

 The same operation as in Example 1 was repeated except that the dye and the amount added were changed as shown in Table 1. Table 1 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Comparative Example 6

In Example 3, the same operation was repeated except that the thickness and the amount of the dye added were changed as shown in Table 1. Table 1 shows the evaluation results of the optical characteristics of the obtained biaxially oriented polyester film.

Thickness Dye Average transmittance Haze contrast Saturation of each wavelength

(Wt%) g / m ² permeability

Example 1 75 A (0.03) 0.032 〇 〇 2 〇 例 Example 2 200 B (0.03) 0.084 ◎ ◎ 4 ◎ ◎ Example 3 50 A (0.04) 0.028 〇 〇 3 〇 〇 Example 4 75 C (0.07) 0.074 ◎ 〇 4 ◎ ◎ Comparative Example 1 75 None X ◎ 'X ◎ Comparative Example 2 75 D (0.35) 0.368 〇 X 4 〇 X Comparative Example 3 75 A (0.20) 0.210 X ◎ 1 ◎ 比較 Comparative Example 4 75 B ( 0.02) 0.021 ◎ ◎ 4 X ◎ Comparative Example 5 75 C (0.25) 0.263 〇 X 4 〇 X Comparative Example 6 200 A (0.10) 0.280 X ◎ 1 ◎ 〇

The symbols (A, B, C and D) of the dyes in Table 1 indicate the following dyes and pigments.

 A: Dainichi Seika Power Bonbon Black (pigment)

B: Nippon Kayaku kay a se t B l ac k AN (dye)

C: Nippon Kayaku's kaya set Gleen AB (dye) / kay aset Vio1et AR (dye) weight ratio 1: 1 mixture

D: Nippon Kayaku kaya set B 1 a c kG (dye)

Example 5

 0.03% by weight of carbon black pigment manufactured by Dainichi Seika, average particle size 1. A molten polyethylene terephthalate ([77] = 0.65) containing 0.007% by weight of silica was extruded from a die, cooled by a cooling drum in a conventional manner to form an unstretched film, and then 90 ° C in the longitudinal direction. After drawing at a draw ratio of 3.5 times at a temperature of 5%, an aqueous liquid having a concentration of 8% of the following coating composition was uniformly applied to both surfaces with a mouth coater, and then continuously at 95 ° C. While drying, the film was stretched 3.8 times in the transverse direction at 120 ° C and heat-set at 230 ° C to obtain an easily adhesive film having a thickness of 75111. The thickness of the coating film was 0.15 m. Table 2 shows the evaluation results of the obtained easily adhesive films. Composition for coating film

 The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and 5-sulfoisophthalic acid (4 mol%), and the daricol component is ethylene glycol (95 mol%) and neopentyl diol. (5 mol%) Tg 68 copolymerized polyester

 80% by weight

 N, N'—Ethylene bis-forced prillamide 5% by weight

Acryl resin fine particles (average particle size 0.03 / zm) 10% by weight

5% by weight of polyoxyethylene nonylphenyl ether

Examples 6 to 8

A 75 m thick easily adhesive optical film was obtained in the same manner as in Example 6, except that the composition of the coating composition was changed as shown in Table 2. The thickness of the coating is 0.15 m. Table 2 shows the evaluation results of the obtained easily adhesive films.

Table 2 Composition for easily adhesive coatings ^> (wt%) Back coating thickness Adhesive strength of coated surface Water-based fatty acid amide Roughened interface Reflectivity Coefficient Directional refractive index Surface roughness Hard coat Polyester Fatty acid bisamide Substance Activator () (nm)

Example 5 Ρ (80) J (5) Κ (10) Υ (5) 〇 0.70 1.559 10 〇 4 Example 6 Ρ (80) H (5) Κ (10) Υ (5) 〇 0.72 1.552 10 〇 4 Example 7 Q (80) H (5) αο) Υ (5) 〇 0.75 1.550 9 ◎ 5 Example 8 Q (80) 1 (5) καο) Υ (5) 〇 0.72 1.549 9 ◎ 5

The symbols (P, Q, H, I, J, G and Y) of the coating film compositions in Table 2 indicate that they are the following polymers or compounds, respectively.

Water-based polyester

Ρ: The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the glycol components are ethylene glycol (95 mol%) and neopentyldalicol. (5 mol%) copolymerized polyester (T g = 68 ^nC )

 Q: The acid components are terephthalic acid (85 mol%) and isophthalic acid (15 mol%), the glycol components are ethylene glycol (57 mol%), 1,4-butanediol (40 mol%), and diethylenedalicol ( 2 mol%) and polyethylene dalicol (molecular weight 600) (1 mol%) copolymerized polyester (Tg = 47 ° C)

Amide of fatty acid, bisamide of fatty acid

 H: N, N'—methylenebisphosphate amide

 I: N, N'—Ethylenebispalmitic acid amide

J: N, N '—Ethylenebis-caprolamide

Roughening material

 K: Acryl-based resin fine particles (average particle size: 0.0 Surn)

Surfactant

 Y: Polyoxyethylene nonylphenyl ether

Example 9

 A UV-curable composition having the following composition was uniformly applied on one surface of the easy-adhesive film of Example 5 using a mouth-to-mouth solution so that the film thickness after curing was 5 m. Coated.

 UV curable composition

 Eri Eri Suri! 45% by weight acrylate

 N-methylol acrylamide 40% by weight

 N-vinyl lipidone 10% by weight

5% by weight of enyl ketone Thereafter, ultraviolet light was irradiated for 30 seconds using a high-pressure mercury lamp having an intensity of 80 W / cm to cure the film, thereby forming a hard coat layer.

Then, on the hard coat layer, a low refractive index layer (S i〇 ₂ , 30 nm), a high refractive index layer (T i〇 ₂ , 30 nm), and a low refractive index layer (S i〇 ₂ , 3 0 nm), by sputtering a high refractive index layer (T I_〇 _2, 1 0 0 nm) and a low refractive index layer (S I_〇 _2, 1 0 0 nm) anti-reflection layer they are laminated in this order Formed. Table 3 shows the evaluation results of the obtained optical laminate.

Examples 10 to 12

 In Example 9, the same operation was repeated except that the biaxially oriented film and the stretching temperature and the stretching ratio were changed to those of Examples 2 to 4. Table 3 shows the evaluation results of the obtained optical laminate.

Comparative Examples 7 to 12

 In Example 9, the biaxially oriented film and the stretching temperature and stretching ratio were changed to those of Comparative Examples 1 to 6, and the coating composition used to form the slippery adhesive layer is shown below. The same operation was repeated except for the above change. Table 3 shows the evaluation results of the obtained optical laminate.

Composition for coating film

 The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and 5-sulfoisophthalic acid (4 mol%), and the dalicol component is ethylene dalicol (95 mol%) and neopentyldaricol. (5 mol%) copolymerized polyester with T g 68 ° C

 80% by weight

 N, N'—Ethylene bis-forced prillamide 5% by weight

Acryl-based resin fine particles (average particle size: 0.03 xm)

Polyoxetylene nonylphenyl ether Table 3 Evaluation of base thickness dye as antiglare film

Film Om) (wt%) g / m ² Haze Contrast Saturation Surface anti-IT Abrasion resistance Example 9 Example 1 75 A (0.03) 0.032 2 〇 ◎ ◎ Good

Example 10 Example 2 200 B (0.03) 0.084 4 ◎ ◎ ◎ Good

Example 11 Example 3 50 A (0.04) 0.028 3 〇 〇 ◎ Good

Example 12 Example 4 75 C (0.07) 0.074 4 ◎ ◎ ◎ Good

Comparative Example 7 Comparative Example 1 75 None 4 X ◎ ◎ Good

Comparative Example 8 Comparative Example 2 75 D (0.35) 0.368 4 〇 X ◎ Good

Comparative Example 9 Comparative Example 3 75 A (0.20) 0.210 1 ◎ 〇 ◎ Good

Comparative Example 10 Comparative Example 4 75 B (0.02) 0.021 4 X ◎ ◎ Good C Comparative Example 11 Comparative Example 5 75 C (0.25) 0.263 4 〇 X ◎ Good

Comparative Example 12 Comparative Example 6 200 A (0.10) 0.280 1 ◎ 〇 ◎ Good

Hereinafter, Tables 1 to 3 will be considered. As is clear from Table 1, the biaxially oriented polyester films of the present invention (Examples 1 to 4) are excellent in transparency and image contrast. The adhesive films (Examples 5 to 8) obtained by coating the biaxially oriented polyester film of the present invention with the adhesive m (Examples 5 to 8) showed that the adhesive film for glass and the cord coat were clear as shown in Table 2. It has good adhesiveness and does not impair optical properties. Moreover, the laminated films in which the hard coat layer and the antireflection layer are provided on the adhesive film of the present invention (Examples 9 to 12) not only have an image contrast, but also have abrasion resistance and antireflection ability. It was excellent. On the other hand, the biaxially oriented polyester films of Comparative Examples 1 to 6 and the laminated films of Comparative Examples 7 to 12, which did not satisfy any of the requirements of the present invention, showed only poor optical characteristics.

Example 13

The dyes represented by the following general formulas (1 ′), (2,), (3,) and (4 ′) were converted to 40.6 mol 1%, 16.7 mol%, 26.2 mol% and 16.6 mol 1%, respectively. The dye mixture and the porous silica having an average particle size of 1.7 were mixed into polyethylene terephthalate having an intrinsic viscosity of 0.65 (35.C, o-chlorophenol), respectively. After blending so as to be 08% by weight and 0.007% by weight, the polyethylene terephthalate was extruded in a molten state from a die, and cooled by a cooling drum by a conventional method to obtain an unstretched film. Next, the unstretched film was stretched in the longitudinal direction at a temperature of 90 ° C. at a stretch ratio of 3.5, and an aqueous liquid having a concentration of 8% of the following coating composition was applied to both surfaces thereof. And then dried at 95 ° C, stretched transversely with 12 O at a stretch ratio of 3.8 times, heat-fixed with 23 Ot: and a thickness of 75 Atm. An easily adhesive film was obtained. The thickness of the coating film is 0.15

Was. Table 4 shows the evaluation results of the obtained easily adhesive films.

Composition for coating film

 The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the glycol component is ethylendalicol (95 mol%) and neopentyldaricol ( (5 mol%) copolymerized polyester with Tg of 68 ° C

 80% by weight

 N, N '-ethylene bis-forced prillamide 5% by weight

Acryl-based resin fine particles (Average particle size: 0.03-10% by weight

Polyoxetylene nonyl phenyl ether

Examples 14 to 16, Comparative Example 13

 The same operation as in Example 13 was repeated except that the thickness, the type of dye and the amount of dye added were changed as shown in Table 4, respectively. Table 4 shows the evaluation results of the optical characteristics of the obtained biaxially oriented polyester film.

Comparative Examples 14, 15 In Example 13, the type of dye and the amount of dye added were changed as shown in Table 4, and 0.07% by weight of porous silica having an average particle size of 4.0 m was added as a lubricant. Other than the above, the same operation was repeated. Table 4 shows the evaluation results of the optical characteristics of the obtained biaxially oriented polyester film.

Table 4 Thickness Dye Lubricant Heat setting temperature Heat shrinkage (%) Surface roughness To transmittance -S "Contrast Saturation After AR processing

(βΐΏ) (% by weight) g / m ^z (° C) Longitudinal width (nm) (%) (%) (1) (1) Surface properties (1) Example 13 75 EC0.08) 0.084 S 230 1.60 0.80 5.1 〇 1.3 ◎ ◎ 〇 Example 14 200 FC0.03) 0.084 S 230 1.54 0.60 5.2 〇 2.1 ◎ 〇 〇 Example 15 50 GC0.04) 0.028 S 230 1.39 0.76 5.4 〇 0.9 〇 〇 例 Example 16 75 G (0.07) 0.074 S 230 1.61 0.60 5.0 〇 1.2 ◎ 〇 比較 Comparative example 13 75 None S 230 1.63 0.50 5.4 X 1.3 X ◎ 比較 Comparative example 14 75 EC0.08) 0.084 'T 230 1.60 0.79 22.2 〇 8.2 ◎ ◎ 〇 〇 Comparative Example 15 75 G (0.07) 0.074 T 230 1.58 0.98 18.9 〇 7.6 ◎ ◎ 〇

Here, the dyes represented by the symbols E, F and G in Table 4 are the dyes of (1 ′) (2 ′) (3 ′) (4 ′) represented by the general formula of Example 4, It was mixed in the following ratio.

 E: (1,): (2,): (3,): (4 ')

 = 40.6: 16.7: 26.2: 16.6 (mo 1)

 F: (1 '): (2'): (3,): (4,)

 = 35.3: 28.9: 14.2: 21.6 (mo 1%)

G: (1,): (2,): (3 '): (4,)

 = 30.5: 25. 0: 19.7: 24.9 (mo 1)

 Furthermore, the symbols S and T in Table 1 indicate the following lubricants.

 : Porous silica with an average particle size of 1.7 / zm (0.0038wt%)

T: Natural force Olin particles with an average particle size of 0.9 xm (0.08 Owt)

Examples 17 to 20

An optically-adhesive film with a thickness of 75 m was obtained in the same manner as in Example 13 except that the composition of the coating composition was changed as shown in Table 5. The thickness of the coating film was 0.15 m. Table 5 shows the evaluation results of the obtained easily adhesive films.

Table 5 Example 17 Example 18 Example 19 Example 20

 Aqueous polyester (wt%) P (80) Ρ (80) Q (80) Q (80)

 Fatty acid amide or fatty acid bisamide (% by weight) J (5) Η (5) Η (5) 1 (5)

Composition for easily adhesive coating

 Roughening substance (wt%) K (10) Κ (10) Κ (10) Κ (10)

 Surfactant (% by weight) Y (5) Υ (5) Υ (5) Υ (5)

 Backside reflectance (1) 〇 〇 〇 〇

 (One) 0.70 0.72 0.75 0.75

 Thickness direction refractive index Refractive index 1.559 1.552 1.550 1.549

 Surface roughness (nm) 10 10 9 9

 Adhesive resistance (1) 〇 ◎ ◎ ◎

Wisteria, -document (one) 4 4 5 5 0

Here, the symbols P, Q, H, I, J, K and Y in Table 5 represent the following polymers or compounds in the coating composition, respectively.

Water-based polyester

 P: The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the glycol components are ethylene glycol (95 mol%) and neopen Copolymerized polyester of tildaricol (5 mol%) (T g = 68 ° C)

 Q: Acid components are terephthalic acid (85 mol%) and isophthalic acid (15 mol%), glycol components are ethylene glycol (57 mol%), 1,4-butanediol (40 mol%), diethylene Copolyester of Daricol (2 mol%) and Polyethylene Daricol (molecular weight: 600) (1 mol%) (T g = 47 ° C)

Amide of fatty acid, bisamide of fatty acid

 H: N, N'-methylenebisphosphate amide

 I: N, N'—Ethylenebispalmitic acid amide

 J: N, N 'monoethylenebiscaprylic amide

Roughening material

 K: Acryl resin fine particles (average particle diameter: 0.03 m)

Surfactant

 Y: polyoxyethylene noenyl ether

Example 2 1

 Example 1 A UV-curable composition having the following composition was uniformly applied on one surface of the easy-adhesive film of Example 3 using a mouth-to-mouth solution so that the film thickness after curing was 5 m. Was applied.

UV curable composition

 Pen evening erythritol acrylate 45 5% by weight

 N-methyl acrylamide 40% by weight

 N-vinylpyrrolidone 10% by weight

1-hydroxycyclohexyl phenyl ketone 5% by weight Thereafter, ultraviolet irradiation was performed for 30 seconds with a high-pressure mercury lamp having an intensity of 8 OWZ cm to perform hardening, thereby forming a hard coat layer.

Then, on the node coat layer, a low refractive index layer (Si ₂ , 30 nm), a high refractive index layer (Ti ₂ , 30 nm), a low refractive index layer (Sio ₂ , 3 0 nm), by sputtering a high refractive index layer (T I_〇 _2, 1 0 0 nm) and a low refractive index layer (S I_〇 _2, 1 0 0 nm) anti-reflection layer are laminated in this order Formed. Table 6 shows the evaluation results of the obtained optical laminate.

Example 22 to 24

 The same operation as in Example 21 was repeated except that the stretching temperature and the stretching ratio in the easily adhesive film and the production process thereof were changed to those of Examples 14 to 16. Table 6 shows the evaluation results of the obtained optical laminate.

Comparative Example 16 to 18

 In Example 21, the stretching temperature and the stretching ratio in the easy-adhesion film and the manufacturing process thereof were changed to those of Comparative Examples 13 to 15 and used to form an easily-adhesive coating film with respect to the adhesive. The same operation was repeated except that the coating composition was changed as shown below. Table 6 shows the evaluation results of the obtained optical laminate.

Composition for coating film

 The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the glycol component is ethylene glycol (95 mol%) and neopentyl glycol. (5 mol%) copolymerized polyester with T g 68 ° C

 80% by weight

 N, N'—Ethylene bis-forced prillamide 5% by weight

Acryl resin fine particles (average particle diameter: 0.03 m) 10% by weight

5% by weight of polyoxyethylene nonylphenyl ether Go to Table 6-_ · Insertion J-shape Dye Evaluation as anti-glare film Film (% by weight) Haze Contrast Saturation Surface reflection Abrasion resistance Example 21 Example 13 75 Ε (0.08) 0.084 1.3 ◎ ◎ 良好 Good Example 22 Example 14 200 F (0.03) 0.084 2.1 ◎ 〇 〇 Good Example 23 Example 15 50 G (0.04) 0.028 0.9 〇 〇 Good Example 24 Example 16 75 G (0.07) 0.074 1.2 ◎ 〇 〇 Good Comparative Example 16 Comparative Example 13 75 None 1.3 X ◎ 良好 Good Comparative Example 17 Comparative Example 14 75 ECO.08) 0.084 8.2 ◎ ◎ X Good Comparative Example 18 Comparative Example 15 75 G (0.07) 0.074 7.6 ◎ 〇 X Good

Hereinafter, Tables 4 to 6 are considered. As is clear from Table 4, the adhesive films of the present invention (Examples 13 to 16) are excellent in transparency and image contrast. As is clear from Table 5, these adhesive films of the present invention (Examples 17 to 20) have good adhesiveness to glass adhesives and eighty-one coats while deteriorating optical characteristics. Absent. Moreover, the laminated films (Examples 21 to 22) in which the hard coat layer and the anti-reflection layer are provided on the adhesive film of the present invention have not only the contrast of the B image but also the abrasion resistance and the anti-reflection ability. It was excellent. In contrast, the easily adhesive films of Comparative Examples 13 to 15 and the laminated films of Comparative Examples 16 to 18 which did not satisfy any of the requirements of the present invention showed only poor optical characteristics. Example 25

 Example 2 is the same as Example 2 except that 0.5% by weight of 2,2′-p-phenylenebis (3,1-benzoxazidinone-141) is added as an ultraviolet absorber in addition to the dye. Operation was repeated. Table 7 shows the evaluation results of the optical properties of the obtained biaxially oriented polyester film.

Example 26

 In Example 25, the UV absorber was changed to 2,2′-P, p′-diphenylenebis (3.1-benzozozidinone-one), and the added amount was changed to 1.0% by weight. Other than the above, the same operation was repeated. Table 7 shows the evaluation results of the optical characteristics of the obtained biaxially oriented polyester film.

Example 27

 In Example 26, the same operation was repeated except that the addition amount of 2,2′-P, p′-diphenylenebis (3,1-benzoxazidinone-one) was changed to 0.5% by weight. Was. Table 7 shows the evaluation results of the optical characteristics of the obtained biaxially oriented polyester film.

Example 28

In Example 25, the same operation was repeated except that the ultraviolet absorbent was changed to 2-p-nitrophenyl-3,1-benzoxazinone-1-one and the added amount was changed to 0.5% by weight. Was. Of the optical properties of the obtained biaxially oriented polyester film Table 7 shows the evaluation results.

 Table 7

Here, the ultraviolet absorbers represented by the symbols U, V and W in Table 7 are as follows.

 U: 2, 2 '_p-phenylene bis (3,1-bunzoxazidinone-4-one) V: 2-p-ditrofu-2-ru 3, 1-benzozoxazinone-4-one

W: 2,2'-p, p'-diphenylenebis (3,1-benzoxazidinone 4-one)

Example 29

 Molten polyethylene terephthalate containing 0.03% by weight of Kaya set B 1 ack AN (dye) manufactured by Nippon Kayaku Co. and 0.007% by weight of porous silica having an average particle diameter of 1.7 / zm ([? 7] = 0.65) from a die, cooled with a cooling drum by a conventional method to form an unstretched film, and then stretched in a longitudinal direction at a temperature of 90 at a stretch ratio of 3.5 times. Aqueous liquid with a concentration of 8% of the composition for application is uniformly applied all over a roll, then stretched 3.8 times at 120 ° C in the horizontal direction while drying at 95 ° C, then 230 ° By heat fixing with C, an easily adhesive film having a thickness of 75 / m was obtained. Incidentally, the thickness of the coating film was 0.15 m. Table 8 shows the evaluation results of the obtained easily adhesive film.

Composition for coating film

The acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), and the daricol component is ethylene dalicol (9 mol%). 5 mol%) and neopentyl glycol (5 mol%), T g 68 ° C copolymerized polyester

 80% by weight

 N, N'—Ethylene bis-caprolamide

Acryl resin fine particles (average particle diameter: 0.03 m) 10% by weight

5% by weight of polyoxyethylene nonylphenyl ether

Example 30

 Example 29 is the same as Example 29 except that 0.5% by weight of 2,2′-p-phenylenebis (3,1-bunzoxazinone-1-one) was added as an ultraviolet absorber in addition to the dye. Operation was repeated. Table 8 shows the evaluation results of the obtained easily adhesive film. Example 31 to 33

 In Example 30, the same operation was repeated except that the ultraviolet absorber and the amount of addition thereof were changed as shown in Table 8. Table 8 shows the evaluation results of the obtained easily adhesive films.

 Table 8

The symbols (P, Q, H, I, J, K and Y) of the coating composition in Table 8 are the following polymers or compounds, respectively.

Water-based polyester

Ρ: Acid component is terephthalic acid (90 mol%), isophthalic acid (6 mol%) and potassium 5-sulfoisophthalate (4 mol%), glycol component is ethylene glycol (95 mol%) and neopentyldaricol (5 mol%) copolymerized polyester (Tg = 68.C)

 Q: The acid component is terephthalic acid (85 mol%) and isophthalic acid (15 mol%), the glycol component is ethylene glycol (57 mol%), 1,4-butanediol (40 mol%), diethylene glycol (2 mol%). Mol%) and polyethylene glycol (molecular weight 600) (1 mol%) copolymerized polyester (Tg = 47)

Amide of fatty acid, bisamide of fatty acid

H: N, N'—methylenebisphosphate amide

 I: N, N, monoethylenebispalmitic acid amide

J: N, N'—Ethylene bis-forced prillamide

Roughening material

 K: Acryl resin fine particles (average particle size: 0.03 m)

Surfactant

 Y: polyoxyethylene noenyl ether

Example 34

 A UV curable composition having the following composition was uniformly applied on one surface of the easily adhesive film of Example 29 using a roll coater so that the film thickness after curing was 5 m.

UV curable composition

 Penyu erythritol acrylate 45% by weight

 N-methyl acrylamide 40% by weight

 N-vinylpyrrolidone 10% by weight

 1-hydroxycyclohexyl phenyl ketone 5% by weight

 Thereafter, ultraviolet rays were irradiated for 30 seconds with a high-pressure mercury lamp having an intensity of 8 OW / cm to cure, thereby forming a hard coat layer.

Then, on of the hard coat one coat layer, a low refractive index layer (S i 0 _2, 30 nm), a high refractive index layer (T I_〇 _2, 30 nm), a low refractive index layer (S I_〇 _2, 30 nm), High refractive index layer (Ti ₂ , 100 nm) and low refractive index layer (Si ₂ , 100 nm) are stacked in this order The resulting anti-reflection layer was formed by sputtering. Table 9 shows the evaluation results of the obtained optical laminate.

Example 35 to 38

In Example 34, the same operation was repeated, except that the easily adhesive film was changed to those of Examples 30 to 33. Table 9 shows the evaluation results of the obtained optical laminate.

Table 9 Base Thickness UV absorber Evaluation as anti-glare film Film (um) Haze Contrast Saturation Surface reflection Abrasion resistance Light degradation Example 3 4 Example 2 200 4 ◎ ◎ ◎ Good 〇 Example 3 5 Example 2 5 200 U (0.5) 4 ◎ ◎ ◎ Good ◎ Example 3 6 Example 2 6 200 W (1.0) 4 ◎ ◎ ◎ Good ◎ Example 3 7 Example 2 7 200 W (0.5 ) 4 ◎ ◎ ◎ Good ◎ Example 3 7 Example 2 8 200 V (0.5) 4 ◎ ◎ ◎ Good ◎

Hereinafter, Tables 7 to 9 are considered. As is clear from Table 7, the biaxially oriented polyester film of the present invention to which an ultraviolet absorber was added (Examples 25 to 28) had excellent light degradation resistance, and the adhesive of the present invention using them was used. The transparent films (Examples 30 to 33) and the laminated films (Examples 35 to 38) also had excellent light resistance.

 As described above, according to the present invention, it is possible to obtain a biaxially oriented polyester film having high image contrast without impairing transparency and a laminated film thereof. Furthermore, according to the present invention, if the adhesive strength of the laminated film is improved and the back surface reflectance is reduced, the surface hardness / abrasion resistance and the like are good, and sufficient transparency, anti-glare properties and explosion-proof properties are obtained. It can be used as a protective film for personal computer displays. Further, the biaxially oriented polyester film of the present invention and the laminated film thereof may be used in addition to the above-mentioned surface protective plate of a personal computer display, as well as the surface of window glass, showcases, glasses, instruments, photographs, paintings, illustrations, signs, etc. It can be suitably used as a protective sheet and has high industrial value.

Claims

The scope of the claims

1. (1) Contains a dye,

 (2) The haze value is 5% or less,

 (3) The average value (Ta v) of the light transmittance at a wavelength of 450 to 650 nm is 40 to 80%,

 (4) The value obtained by dividing the transmittance (T i) of light of each wavelength i at a wavelength of 450 to 650 nm by Ta V is 0.7 to 1.3; and

 (5) A biaxially oriented polyester film, which is a base film for a laminated film for laminating an image display surface.

2. The biaxially oriented polyester film according to claim 1, wherein the pigment is at least one selected from the group consisting of organic dyes and pigments having an average particle size of 10 to 500 nm. 3. The biaxially oriented polyester film according to claim 1, wherein the pigment is a combination of at least two kinds of organic dyes.

4. The organic dye has the following formula (1) to (4):

Here, Ri R ¹⁶ is each independently a hydrogen atom, an aliphatic group having 1 to 6 carbon atoms, an aromatic group having 6 to 14 carbon atoms, an aromatic alkyl group having 7 to 14 carbon atoms, and 4 to 4 carbon atoms. 12 heterocyclic group, a halogen atom, Shiano group, a nitro group, one C_〇_R ^{17, -COO R 17, -NR 17} R 18, - NR 18 COR 19, one NR ¹⁸ S0 ₂ R ^19, one CONR ^{1 7} R ^18, one _{^{S0 2 NR 17 R 18, -COR}} 19, one S_〇 ₂ R ^19, -COR ^19, a -NR ¹⁷ CONR ¹⁸ R ^19, one C_〇_NR ¹⁸ S0 ₂ R ¹⁹ or a SOsNR COR ^{1 9} R ¹⁷ and R ¹⁸ are each independently a hydrogen atom, an aliphatic group having 1 to 6 carbon atoms, an aromatic group having 6 to 14 carbon atoms or a heterocyclic group having 4 to 12 carbon atoms or R ¹⁷ and R ¹⁸ may be taken together with the nitrogen atom to which they are attached to form a 5- or 6-membered heterocyclic group, and R ¹⁹ is an aliphatic group having 1 to 6 carbon atoms, An aromatic group having 6 to 14 or a heterocyclic group having 4 to 12 carbon atoms The biaxially oriented polyester film _{c according} to claim 2 or 3, which is represented by

5. The dye consists of a combination of four organic dyes represented by the above formulas (1) to (4), and is represented by the formulas (1), (2), (3) and (4). 4. The biaxially oriented polyester film according to claim 2, wherein the organic dyes are 20 to 60 mol%, 10 to 30 mol%, 10 to 40 mol% and 10 to 30 mol%, respectively.

6. unit area of content film surface of the dye (m ²⁾ per 02 to 0.42 biaxially oriented polyester film of claim 1.

7. The biaxially oriented polyester film according to claim 1, further comprising an ultraviolet absorber.

8. The UV absorber has the following formula (5)

Position, 2nd position; R ^D1 is n or R

Or a group represented by

The following equation (8)

R ^Q2 and R ^Q3 are the same or different and are monovalent hydrocarbon residues; X ⁰² is a tetravalent aromatic residue, which further contains a heteroatom. Also Good. )

The biaxially oriented polyester film according to claim 7, which is at least one compound selected from the cyclic imino esters represented by

9. The biaxially oriented polyester film according to claim 7, wherein the content of the ultraviolet absorbent is 0.1 to 5% by weight based on the weight of the polyester.

10. The biaxially oriented polyester film according to claim 1, which has a haze value of 3% or less.

11. The biaxially oriented polyester film according to claim 1, wherein Tav is 50 to 70%.

12. The biaxially oriented polyester film according to claim 1, wherein the value of Ti / Tav is 0.8 to 1.2.

13. The biaxially oriented polyester film according to claim 1, having a heat shrinkage at 150 ° C of 2% or less.

14. An adhesive film comprising the biaxially oriented polyester film according to claim 1 and a first adhesive layer provided on at least one side of the film.

15. The adhesive film according to claim 14, wherein a reflectance at which an incident light is reflected at an interface between the biaxially oriented polyester film and the first adhesive layer is 0.4% or less with respect to the incident light.

16. The adhesive film according to claim 15, wherein the refractive index (nz) of the first adhesive layer in the thickness direction is in the range of 1.50 to 1.60.

17. The adhesive film according to claim 15, wherein the thickness of the first adhesive layer is in the range of 70 to 100 nm.

1 8. The biaxially oriented polyester film according to claim 1, a first adhesive layer provided on both sides of the film, and the first adhesive layer is different from a surface of the first adhesive layer which is in contact with the biaxially oriented polyester film. The image display surface is composed of a hard coat layer provided on the surface and a second adhesive layer provided on a surface different from the surface of the other first adhesive layer in contact with the biaxially oriented polyester film. Laminated film for lamination.

19. The laminated film according to claim 18, further comprising a multilayer antireflection layer on a surface of the hard coat layer different from the surface in contact with the first adhesive layer.