JPH1044587A - Support for ink jet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an ink receiving layer from being removed easily even when it is sprayed with water after absorbing ink by coating a plastic film with a self-crosslinking resin or a resin layer being rendered insoluble with a crosslinking agent to provide a primer layer thereby bonding the ink receiving layer firmly. SOLUTION: At least one kind of resin selected from polyurethane based resin, acryl based resin, copolymer polyester based resin, polyethylene imine based resin and polyamide based resin is rendered insoluble through crosslinkng as an anchor layer resin, or at least one kind of self-crosslinkingresin selected from melamine based resin, urea formalin based resin or multifunctional block isocyanate based resin is applied and rendered insoluble. Since the anchor layer is rendered insoluble through crosslinking, excellent adhesion and waterproofness can be achieved. A waterproof plastic film support can be obtained by bonding an ink receiving layer firmly through the anchor layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an ink receiving layer which is firmly adhered to the ink receiving layer, and it is difficult to remove the ink receiving layer even if water is applied after the ink has been absorbed. An object of the present invention is to provide a base film for an image receiving film, which is less likely to cause wrinkles and the like and is suitable for output from an ink jet printer.

[0002]

2. Description of the Related Art In recent years, with the spread of electronic still cameras or computers, hard copy technology for recording images on paper or the like has rapidly developed. The ultimate goal of these hard copies is silver halide photography. In particular, how to bring color reproducibility, image density, gloss, weather resistance, etc. close to silver halide photography has been a subject of development. As a method of recording a hard copy, various methods such as a sublimation heat transfer method, an ink jet method, and an electrostatic transfer method are known in addition to a method of directly photographing a display on which an image is displayed by a silver halide photograph. 2. Description of the Related Art Inkjet printers have been rapidly spreading in recent years due to their ease of full color printing and low printing noise. In the ink jet method, ink droplets are ejected from a nozzle toward a recording material at a high speed, and a large amount of solvent is contained in the ink. For this reason, a recording sheet for an ink jet printer is required to absorb ink quickly and have excellent color developing properties. These ink jet recordings are aimed at silver halide photography, but none of such prints has high quality, high quality, water resistance, and does not show off even in continuous prints. Particularly, in the field where high image quality of photographic tone is required, it is suitable to use a plastic film having excellent smoothness as a support, but generally, the adhesion between the plastic film and the ink receiving layer is insufficient. For the purpose of solving the problem, it has been proposed to provide an anchor coat layer between the plastic film and the ink receiving layer. However, even if such an anchor layer is provided, even if the water droplet adheres and is wiped off, the image receiving layer has not reached the state where it does not detach, and it has not yet reached sufficient water resistance. It is.

[0003]

According to the present invention, the ink receiving layer is firmly adhered to the ink receiving layer, and it is difficult to remove the ink receiving layer even if water is applied after the ink has been absorbed. The purpose is to provide a base film for an image receiving film that is less likely to cause problems such as feeding and wrinkles, and has high gloss, high quality and high quality recording such as a silver halide photograph when output with a color inkjet printer. I do.

[0004]

According to the present invention, there is provided a plastic support on which a recording medium is provided by coating an ink-receiving layer, on a plastic film, a polyurethane resin, an acrylic resin, a copolymerized polyester resin. A support for an inkjet recording medium, wherein a resin layer obtained by insolubilizing at least one resin selected from a polyethyleneimine-based resin and a polyamide-based resin with a crosslinking agent is applied as a primer layer, or A plastic film coated with at least one kind of self-crosslinking resin selected from melamine resin, urea formalin resin and polyfunctional block isocyanate resin, and having an insolubilized resin layer as a primer layer And a support for an ink jet recording medium. In the present invention, the base resin of the film used is not particularly limited, and for example, a polyolefin resin, a polyamide resin, a polyacryl resin,
Polyurethane-based resins, polyvinyl-based resins, polyether-based resins, polystyrene-based resins and the like can be mentioned, and polyester resins described below are particularly preferred.

[0005] The polyester in the present invention is obtained by mixing an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid or an ester thereof with a glycol such as ethylene glycol, diethylene glycol, 1,4-butanediol and neopentyl glycol. It is a polyester produced by condensation. These polyesters can be prepared by directly reacting an aromatic dicarboxylic acid and a glycol, or by subjecting the alkyl ester of an aromatic dicarboxylic acid to a transesterification reaction with a glycol followed by polycondensation, or a diglycol ester of an aromatic dicarboxylic acid. Can be produced by a method such as polycondensation. Representative examples of such polyesters include polyethylene terephthalate, polyethylene butylene terephthalate and polyethylene-2,6-naphthalate. This polyester may be a homopolymer or a copolymer of the third component. In any case, in the present invention, a polyester having an ethylene terephthalate unit, a butylene terephthalate unit or an ethylene-2,6-naphthalate unit of 70 mol% or more, preferably 80 mol% or more, more preferably 90 mol% or more is preferable. .

In the present invention, it is preferable to use a base film containing a large number of fine cavities inside. Although the method is not particularly limited, it is particularly preferable that the polyester contains a large number of thermoplastic resins and / or particles that are incompatible with the polyester and is oriented at least uniaxially as described below. Is a method of containing many fine cavities inside. The thermoplastic resin incompatible with the polyester used in the present invention is not particularly limited as long as it is incompatible with the polyester, and is arbitrary. Specific examples include polystyrene-based resins, polyolefin-based resins, polyacryl-based resins, polycarbonate resins, polysulfone-based resins, cellulose-based resins, and polyamide resins. In particular, polystyrene resins or polyolefin resins such as polymethylpentene, polypropylene and cyclic olefin are preferably used. The amount of the immiscible resin to be mixed with the polyester varies depending on the amount of the target cavity, but is preferably 3% by weight to 39% by weight, particularly preferably 5% to 15% by weight.
Is preferred. If the content is less than 3% by weight, there is a limit in increasing the amount of cavities, and the desired flexibility, lightness, or drawing property cannot be obtained. On the other hand, if it is 40% by weight or more, the stretchability of the film is significantly impaired, and the heat resistance, strength, and stiffness are impaired. Further, two or more of these thermoplastic resins may be used in combination.

Further, in order to contain fine voids in the film or to improve the concealing property or the like, inorganic or organic particles are added to the polyester or the incompatible resin as required. You may. Examples of the particles that can be added include silica, kaolinite, talc, calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, titanium oxide, crosslinked acrylic particles, crosslinked polystyrene particles, and the like, but are particularly limited. Not something. The cavity-containing film of the present invention may be a single-layer film or a composite film having two or more layers.

[0008] The film of the present invention has an apparent specific gravity of preferably 0.7 or more and less than 1.32, more preferably 1.0 or more and less than 1.25, and even more preferably 1.05 or more and less than 1.25. Preferably, there is. If the apparent specific gravity is less than 0.7, the void content is too large, and the strength of the film is remarkably impaired, and cracks and wrinkles on the film surface are likely to occur regardless of the vertical and horizontal balance. vice versa,
When the apparent specific gravity exceeds 1.32, the void content becomes too small, the cushioning property is lost, and the drawing property with a pencil is lost.

The ink jet recording film of the present invention has a light transmittance of 60% or less, preferably 20% or less, more preferably 15% or less, and further preferably 10% or less. If it exceeds 60%, the back side can be seen through, and the appearance of the printed matter becomes poor. The polyester film containing fine cavities of the present invention needs to have an in-plane birefringence of -0.02 to +0.04, preferably 0 to +0.03. By setting the in-plane birefringence to -0.02, preferably 0 or more, a film having substantially isotropic properties can be obtained for the first time. Here, the fact that the in-plane birefringence is + (-) means that the history of longitudinal stretching is larger (smaller) than the history of transverse stretching, and is caused by the so-called bowing phenomenon during transverse stretching. A slight distortion of the main axis of the refractive index may be involved. By setting the in-plane birefringence to -0.02 or more, preferably 0 or more, the film can be hardly torn in the lateral direction. On the other hand, in-plane birefringence is +0.0
On the other hand, when the value exceeds 4, the film is apt to be vertically torn, and the film is easily broken at the time of slitting, and the film is liable to be cut in the longitudinal direction when cut into sheets. Further, the in-plane birefringence is less than -0.02 or +0.02.
If it is 4 or more, it may cause wrinkling or curling in the printer.
The method for producing the film of the present invention is not particularly limited and is optional, but the most preferred production method is as follows. That is, the unstretched film is vertically
Polyester containing fine cavities, characterized in that after stretching 3.0 times or more in multiple steps or more, a relaxation treatment of 3% or more in the longitudinal direction is performed, and then horizontal stretching and heat treatment are performed at a magnification equal to or greater than the longitudinal stretching ratio after the relaxation treatment. This is a method for producing a base film.

First, in the first longitudinal stretching step, stretching is performed between two or many rolls having different peripheral speeds. As a heating means at this time, a method using a heating roll, a method using a non-contact heating method may be used, or both may be used. However, in order to develop a large number of cavities at the interface of the immiscible resin, the stretching temperature is set to the secondary transition temperature T of the polyester.
g + 10 ° C or more and Tg + 50 ° C or less, 3.0 times or more,
Preferably, it is stretched in a range of 3.2 to 5.0 times. Stretch ratio
If the ratio is 3.0 times or less, it is difficult to sufficiently develop fine cavities inside the film and to reduce the apparent specific gravity of the film to 1.3 or less. On the other hand, if the longitudinal magnification exceeds 5 times, it is difficult to sufficiently perform the subsequent relaxation treatment, and it is substantially difficult to reduce the in-plane birefringence of the film to 0.04 or less.

Next, a relaxation treatment of 3% or more, preferably 5% or more is performed in the vertical direction. A more preferable relaxation rate varies depending on the longitudinal stretching ratio performed before the relaxation, but it is preferable to determine the longitudinal stretching ratio after the relaxation to be 2.8 to 3.5. Only by applying a relaxation treatment of 3% or more, a film having an in-plane birefringence of -0.02 to +0.04 can be industrially stably manufactured. Conversely, when the relaxation treatment of 3% or more is not performed, the lateral stretching property in the next step becomes extremely poor, and a film having an in-plane birefringence of -0.02 to +0.04 cannot be produced. Moreover, the apparent specific gravity
When producing a film of 1.30 or more (a film having a low content of fine voids), it is possible to produce an isotropic film without performing relaxation treatment. However, in this case, it is not possible to produce a fine void-containing film having the desired specific gravity of the present invention.

A preferred stretching ratio after longitudinal relaxation is 2.8.
~ 3.5. If the longitudinal stretching ratio after relaxation is 2.8 or less, the film may not be uniformly relaxed, resulting in a non-uniform film, or the in-plane birefringence after biaxial stretching may be -0.02 or less. Is not preferred. Conversely, if the longitudinal stretching ratio after relaxation exceeds 3.5, the stretchability during transverse stretching becomes poor and the in-plane birefringence after biaxial stretching may exceed +0.04, which is not preferred. As a method of performing the relaxation treatment, the film is once cooled and then placed in an oven.
C. to 150.degree. C., or a relaxation treatment between rolls without cooling immediately after longitudinal stretching, or between a driving roll group or a free roll group heated to 60.degree. C. to 100.degree. A method of performing relaxation treatment, a method of appropriately combining these, or the like can be adopted.
However, a method in which the relaxation treatment is performed mainly by a method of performing the relaxation treatment without cooling immediately after the longitudinal stretching is preferable, and a uniform relaxation treatment can be efficiently performed. Next, the film after the longitudinal relaxation treatment is introduced into a tenter, and transverse stretching and heat treatment are performed at a magnification equal to or greater than the longitudinal stretching magnification after the relaxation treatment. The preferred transverse stretching temperature is equal to or higher than the maximum temperature of the longitudinal stretching / relaxation treatment and equal to or lower than the melting point Tm-10 ° C of the polyester. If the transverse stretching ratio is smaller than the longitudinal stretching ratio after the relaxation treatment, in-plane birefringence
+0.04 or less is difficult. The upper limit of the transverse stretching ratio is not particularly limited, but the longitudinal stretching ratio after relaxation treatment is +1.0.
It is preferable to carry out at the following magnification in order to secure stretchability and to make in-plane birefringence -0.02 or more. The biaxially stretched film thus obtained is subjected to a heat treatment as necessary. The heat treatment is preferably performed in a tenter, and is preferably performed in the range of the melting point Tm of polyester to 50 ° C to Tm.

Further, in parallel with the heat treatment, re-lateral stretching or relaxation in the transverse direction may be performed. In the present invention,
By providing the anchor layer having the above structure on such a substrate, an ink receiving layer made of a resin having an ink absorbing property is firmly bonded, and a plastic film support suitable for a water-resistant inkjet image receiving film is formed. Obtainable. The anchor layer resin of the present invention is a polyurethane resin, an acrylic resin, a copolymerized polyester resin,
At least one resin selected from polyethyleneimine-based resin and polyamide-based resin is insolubilized by a crosslinking agent, or selected from melamine-based resin, urea-formalin-based resin, and polyfunctional blocked isocyanate-based resin. At least one type of self-crosslinking resin is applied and has a great feature in that it is insolubilized.
By insolubilizing the anchor layer by cross-linking, it is possible to achieve strong adhesiveness and water resistance, which are the objects of the present invention.

The polyurethane resin includes (1) a compound having two or more active hydrogen atoms in a molecule, or (2) a chain extender having at least two active hydrogen atoms in a molecule, and (3) a molecule. It is a compound having two or more isocyanate groups therein and obtained by reacting with an organic polyisocyanate. The compounds (1) generally include glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol and 1,6-hexanediol, and polyvalent compounds such as glycerin, trimethylolpropane and pentaerythritol. Examples thereof include alcohols, diamines such as ethylenediamine, hexamethylenediamine and piperazine, aminoalcohols such as monoethanolamine and diethanolamine, thiodiglycols such as thiodiethylene glycol, and water. The compound of the above (2) is a compound containing two or more hydroxyl groups, carboxyl groups, amino groups or mercapto groups at the terminal or in the molecule. Particularly preferred are polyether polyols, polyester polyols and polyether ester polyols. And the like. As the polyether polyol, for example, alkylene oxides such as ethylene oxide and propylene oxide, or a compound obtained by polymerizing styrene oxide and epichlorohydrin or the like, or by random copolymerization, block copolymerization or addition polymerization to a polyhydric alcohol. And the like. Polyester polyols and polyetherester polyols mainly include linear or branched compounds, such as succinic acid, adipic acid, phthalic acid and maleic anhydride, and polyvalent saturated and unsaturated carboxylic anhydrides. Ethylene glycol, diethylene glycol, 1,4
-Butanediol, neopentyl glycol, 1,6-
Produced by condensing polyvalent saturated and unsaturated alcohols such as hexanediol and trimethylolpropane, polyalkylene ether glycols such as relatively low molecular weight polyethylene glycol and polypropylene glycol, or a mixture of these alcohols. I can do it. Furthermore, as a polyester polyol,
Polyesters obtained from lactones and hydroxy acids are mentioned, and polyether ester polyols include polyether esters obtained by adding ethylene oxide or propylene oxide to polyesters produced in advance. The above (3)
Examples of the organic polyisocyanate include isomers of toluylene diisocyanate, aromatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, aromatic aliphatic diisocyanates such as xylylene diisocyanate, isophorone diisocyanate, and 4,4'- Examples thereof include aliphatic diisocyanates such as dicyclohexylmethane diisocyanate, and polyisocyanates obtained by adding one or more of these compounds to trimethylolpropane or the like in advance.

The above-mentioned polyacrylic resin is obtained by polymerizing monomers other than acrylic acid or a derivative thereof and, if necessary, acrylic acid (derivative) having a vinyl group. The monomers used include acrylic acid, methacrylic acid (hereinafter, acrylic acid and / or methacrylic acid are referred to as (meth) acrylic acid) and lower alkyl esters of (meth) acrylic acid (eg, methyl, ethyl, propyl , Butyl, amyl, hexyl, hebutyl, octyl,
2-ethylhexyl ester), methyl methacrylate, hydroxymethyl acrylate, styrene, glycidyl methacrylate, methyl acrylate, ethyl acrylate and the like.

The polyester resin is a polyester resin comprising a dibasic acid and a glycol, which is soluble, emulsified or dispersed in water. For example, the dibasic acid comprises 50 to 0.5 mol% of the total dicarboxylic acid as sulfonic acid. It is a group-containing dicarboxylic acid, and is a polyester copolymer in which these two kinds of dicarboxylic acid components and a glycol component are copolymerized. As the sulfonic acid metal salt-containing dicarboxylic acid,
Metal salts such as sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, and 5 [4-sulfophenoxy] isophthalic acid; and particularly preferred is 5-sodium. Sulfoisophthalic acid and sodium sulfoterephthalic acid. These sulfonic acid metal salt-containing dicarboxylic acids are used in an amount of 50 to 0.5 mol%, preferably 20 to 1 mol%, based on all dicarboxylic acid components. If the amount exceeds 50 mol%, dispersibility in water is improved. Also, the water resistance of the copolymer decreases. The dispersibility of the polyester copolymer in water varies depending on the copolymer composition, the type and amount of the water-soluble organic compound, and the amount of the sulfonic acid metal base-containing dicarboxylic acid component as long as the dispersibility in water is not impaired. , Less is better. As the normal dicarboxylic acid containing no sulfonic acid metal base, aromatic, aliphatic and alicyclic dicarboxylic acids are used. As aromatic dicarboxylic acids, terephthalic acid, isophthalic acid, orthophthalic acid,
2,6-naphthalenedicarboxylic acid and the like can be mentioned. These aromatic dicarboxylic acids are preferably at least 40 mol% of the total dicarboxylic acid components, and are preferably at least 40 mol%.
If it is less than this, the mechanical strength and the water resistance of the polyester copolymer decrease. Examples of the aliphatic and alicyclic dicarboxylic acids include succinic acid, adipic acid, sebacic acid, 1.3-cyclopentanedicarboxylic acid, 1.2-cyclohexanedicarboxylic acid, 1.3-cyclodicarboxylic acid, and 1.4-cyclohexanedicarboxylic acid. The addition of these aromatic dicarboxylic acid components may improve the adhesive performance in some cases, but generally the mechanical strength and water resistance of the polyester copolymer deteriorate. The glycol component to be reacted with the dicarboxylic acid mixture is an aliphatic glycol having 2 to 8 carbon atoms, an alicyclic glycol having 6 to 12 carbon atoms, and a mixture thereof, and ethylene glycol, 1.2-propylene glycol, 1.3 -Propanediol, 1.4-
Butanediol, neobenzyl glycol, 1.6-hexanediol, 1.2-cyclohexanedimethanol, 1.4
-Cyclohexanedimethanol, p-xylene glycol and the like. Examples of the aliphatic diol having 4 or more carbon atoms include diethylene glycol and triethylene glycol, and examples of the polyether include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. The polyester copolymer is obtained by ordinary melt polycondensation. That is, the above-mentioned dicarboxylic acid component and glycol component are directly reacted, water is distilled off, esterification is performed, and then polycondensation is performed, or the dimethyl ester of the dicarboxylic acid component is reacted with the glycol component to distill methyl alcohol. It is obtained by a transesterification method in which the polyester is subjected to transesterification, followed by polycondensation.

In addition, a polymer can be obtained by solution polycondensation or interfacial polycondensation, and the present invention is not limited to any of the above methods. At the time of melt polycondensation, an antioxidant, a slipping agent, inorganic fine particles, and an antistatic agent can be added as necessary. The above-mentioned polyether such as polyethylene glycol can be added by melt blending during melt polycondensation or after polymerization. The polyethyleneimine-based resin is a polymer obtained by polymerizing ethyleneimine and having a weight average molecular weight of 500 to 2,000,000. Among them, a polymer having a weight average molecular weight of 5,000 to 1,000,000 is preferably used.

As the polyamide resin, any known polyamide resin which is composed of a dibasic acid and a diamine and can be dissolved, emulsified or dispersed in water can be used. The crosslinking agent or curing agent for crosslinking and curing the above various resins is not particularly limited, and known ones can be used. For example, a methylol melamine compound, a polyfunctional blocked isocyanate compound, a polyester, a polyamide and / or Examples of the polyether resin include compounds in which two or more blocked isocyanate groups or epoxide rings are added. The amount of the crosslinking agent to be added to the resin is not particularly limited, but is preferably 1 to 100 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the resin. In addition, a catalyst compound having a reaction promoting effect of each cross-linking agent or curing agent can be appropriately added, and various known techniques can be used for this purpose. The self-crosslinking type resin can be selected from resins usable as the crosslinking agent or the curing agent, and particularly, a water-soluble or water-dispersible methylolmelamine resin, a urea formalin resin, a polyfunctional blocked isocyanate group. Polyether added,
Resins such as polyester, polyether urethane and polyether ester are preferably used. If necessary, a curing catalyst can be used.

The anchor coat resin may contain an antioxidant, a surfactant, an antistatic agent, a fluorescent whitening agent, a coloring agent, if necessary, or as long as the desired effect is not impaired.
It is also possible to add compounds such as The method of providing the anchor layer is not particularly limited, but is usually used such as a gravure coat method, a kiss coat method, a dip method, a spray coat method, a curtain coat method, an air knife coat method, a blade coat method, and a reverse roll coat method. Method is applicable. As the step of applying, any method such as a method of applying before stretching the film, a method of applying after longitudinal stretching, and a method of applying to the surface of the film after the orientation treatment is possible.

In the present invention, an antistatic layer may be provided on the opposite side of the anchor layer. For the antistatic layer, the above-described technique of providing an intermediate layer can be applied as it is. The antistatic layer may contain a fluorescent whitening agent, an ultraviolet absorber, an organic lubricant, inorganic and organic fine particles, and the like.
Further, it is also possible to apply an adhesive to the opposite surface of the anchor layer and perform an adhesive process. In this case, the pressure-sensitive adhesive and the pressure-sensitive adhesive processing method are not particularly limited, and various known processing agents and processing methods can be used. In the base film thus obtained, the ink receiving layer is firmly adhered to the ink receiving layer, and it is difficult to remove the ink receiving layer even if water is applied after the ink has been absorbed. The problem is less likely to occur, and it is particularly suitable as a base film for an image receiving film suitable for output from a high-quality color inkjet printer.

Next, examples of the present invention and comparative examples will be described. First, a measurement / evaluation method used in the present invention will be described below. 1) Apparent specific gravity A film was cut out into a square of 5.00 cm x 5.00 cm and the thickness was measured at 50 points, and the average thickness was tμm.
The weight was measured up to 0.1 mg and defined as wg, which was calculated by the following equation. Apparent specific gravity (-) = (W / 5 x 5 x t) x 10000

2) Adhesiveness of ink receiving layer Polyvinyl alcohol (manufactured by Kuraray) on the anchor layer
CM-318) 9.2% by weight, melamine resin (Sumitex M-3, manufactured by Sumitomo Chemical Co., Ltd.) 0.6% by weight, and water 90% by weight were mixed, coated, dried at 120 ° C. for 10 minutes, and inkjet-printed. After the image receiving layer is formed, a cross cut at an interval of 2 mm is made on the image receiving layer, a tape (Nichiban RT18) is attached to the cross cut portion, and the peeling area of the ink receiving layer when vigorously peeled off is displayed in 100%. .

3) Water resistance of the ink-receiving layer Water is dropped on the ink-receiving layer formed in the same manner as in 2) by a spoid. After leaving for 3 minutes, the water is wiped off, and the presence or absence of the ink-receiving layer is visually judged. Then, no omission was given, and o was given.

4) Light transmittance According to JIS-K6714, a Poick integrating sphere formula T.
The light transmittance of the film was measured using an R meter (manufactured by Nippon Seimitsu Kogaku). The smaller this value is, the higher the concealment property is.

5) Presence or absence of wrinkles in the printer The film prepared in 2) was converted to an A4 size printer by an inkjet printer (MJ-700 manufactured by Seiko Epson).
V2C). At this time, it was evaluated as ○ when wrinkles did not occur, and as × when wrinkles occurred.

6) Transportability The film prepared in 2) is passed through an ink jet printer (MJ-700V2C manufactured by Seiko Epson), and
If the film was conveyed at a constant rate and the prints did not overlap or drop out in a row, it was evaluated as ○, and if not, as ×.

7) In-plane birefringence First, the film was cut into a size of 10 cm × 10 cm, and its weight W (g) was measured. Then, using the specific gravity ρ (g / cc) when no cavities exist inside the film, the actual thickness T of the film irrespective of the cavity content is calculated by the following equation.
(Cm) was calculated. T = W / (ρ × 100) Next, a molecular orientation meter MOA-2001A manufactured by Kanzaki Paper Co., Ltd.
The refractive index in the microwave region was determined along the principal axis in the longitudinal direction and the principal axis in the lateral direction by substituting the thickness T described above. Then, in-plane birefringence was determined by the following equation. Double-sided birefringence = longitudinal principal axis refractive index-transverse principal axis refractive index

Example 1 As raw materials, 13% by weight of general-purpose polystyrene (T575-57U manufactured by Mitsui Toatsu Chemicals) and 13% by weight of anatase type titanium dioxide (TA manufactured by Fuji Titanium Co.) were added to 83% by weight of polyethylene terephthalate resin having an intrinsic viscosity of 0.62. -300)
A mixture of 4% by weight was supplied to an extruder, melt-extruded at 290 ° C., and cast on a cooling drum at 30 ° C. using an electrostatic adhesion method to form an unstretched film having a thickness of 950 μm. Next, the film was preheated by a roll heated to 70 ° C., further heated using an infrared heater, and stretched 3.7 times in the machine direction between rolls having different peripheral speeds. At this time, the temperature of the high-speed roll (stretching roll) is 70
° C. And immediately after stretching, without cooling,
A 14% relaxation treatment was applied between the rolls. Therefore, the longitudinal stretching ratio after relaxation was 3.2. Next, the film after completion of longitudinal relaxation was guided to a tenter, preheated at 140 ° C. for 8 seconds, and then stretched 3.6 times in the transverse direction at the same temperature. Then 220
After heat treatment at 5 ° C. for 5 seconds, the film was further stretched 8% in the transverse direction at the same temperature, and further heat treated at the same temperature for 5 seconds. In this way, a polyester film containing fine voids having a thickness of 100 microns was obtained.

On one side of this film, a copolymerized polyester resin (Byron manufactured by Toyobo Co., Ltd.) was used as an anchor layer.
MD-16) and a blocked isocyanate-containing polyester resin (Elastron H-3, manufactured by Daiichi Kogyo Seiyaku)
4) to which 3% by weight of a reactive resin was added.
Weight of water and isopropyl alcohol
3 (weight ratio) mixed with mixed solution, wire bar (# 5)
Was applied. Then, at 80 ° C for 2 minutes and at 170 ° C for 30 minutes.
Dried for seconds.

On the other side, a copolymerized polyester resin (Vylon MD-1 manufactured by Toyobo Co., Ltd.) was used as an antistatic layer.
6) and 2% by weight of an isocyanate-containing polyurethane resin (Elastron H-3 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and 1% by weight of a cationic acrylic resin (Adeka Kathioace PD-50 manufactured by Asahi Denka Kogyo) as an antistatic agent, average Organic particles having a particle size of 1.5 μm (Eposter MS manufactured by Nippon Shokubai Co., Ltd.) are mixed with a 7/3 (weight ratio) mixed solution of water and isopropyl alcohol so as to be 1% by weight, and coated with a wire bar (# 5). did. Then, it was dried at 80 ° C. for 2 minutes and at 170 ° C. for 30 seconds.

Example 2 A block isocyanate-containing polyester urethane resin (Elastron H-3 manufactured by Daiichi Kogyo Seiyaku) was used as an anchor layer on a void-containing polyester film obtained in the same manner as in Example 1 to form a reaction catalyst (Daiichi Kogyo Seiyaku). , Elastron Catalyst 64) was added to a 7/3 (weight ratio) mixed solution of water and isopropyl alcohol so as to be 2% by weight with respect to 3% by weight of a reactive resin, and a wire bar (# 5) Was applied. Then, at 80 ° C for 2 minutes, 170
A substrate film for an inkjet image-receiving film was obtained in the same manner as in Example 1 except that drying was performed at 30 ° C. for 30 seconds. Comparative Example 1 A base film for an inkjet image receiving film was obtained in the same manner as in Example 1 except that the anchor layer and the antistatic layer were not applied.

Comparative Example 2 A base film for an ink-jet image-receiving film was obtained in exactly the same manner as in Example 1 except that the reaction was carried out without adding the blocked isocyanate-containing polyester urethane resin. Comparative Example 3 A microvoided polyester film of Comparative Example 2 was obtained in exactly the same manner as in Example 1, except that the longitudinal stretching ratio was 3.2 times and the longitudinal relaxation treatment was not performed. Table 1 shows the properties of the obtained film.

Example 3 A substrate for an ink jet image receiving film was prepared in the same manner as in Example 1 except that an adhesive layer was applied instead of the antistatic layer and a polyester release film was laminated. A film was obtained.

Example 4 In Example 1, a polyethyleneimine polymer (BASF) was used in place of the copolymerized polyester used for the anchor layer.
Japan Ltd. And LUPASOL-P) were used in the same manner as in Example 1 to obtain a substrate film for an inkjet image-receiving film.

Example 5 In Example 2, a blocked isocyanate-containing polyester urethane resin (Elastron manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used.
H-3) instead of blocked isocyanate-containing polyether urethane resin (Elastron manufactured by Daiichi Kogyo Seiyaku)
A substrate film for an inkjet image receiving film was obtained in the same manner as in Example 2 except that H-38) was used.

[0036]

As shown in the Examples, the base film for an ink jet image receiving film of the present invention has a structure in which the ink receiving layer is firmly adhered to the ink receiving layer, and it is difficult to remove the ink receiving layer even if water is applied after the ink is absorbed. When recording images with a printer, image receiving films that are less likely to cause problems such as double feeding and wrinkles, and that can record high gloss, high quality, and high quality recordings such as silver halide photographs, especially when output with a color inkjet printer It was suitable as a base film for use.

[0037]

[Table 1]

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Claims (8)

[Claims] 1. A plastic support on which a recording medium is provided by coating an ink receiving layer, on a plastic film, a polyurethane resin, an acrylic resin, a copolyester resin, a polyethyleneimine resin, a polyamide resin. A support for an ink jet recording medium, comprising a primer layer or a resin layer in which at least one resin selected from resins is insolubilized by a crosslinking agent or a self-crosslinking resin layer. 2. The ink-jet recording medium according to claim 1, wherein the self-crosslinkable resin is at least one selected from the group consisting of a melamine resin, a urea formalin resin, and a polyfunctional blocked isocyanate resin. Support. 3. The support for ink jet recording according to claim 1, wherein the plastic film is a biaxially stretched film containing polyester as a main component. 4. The ink-jet recording support according to claim 1, wherein the plastic film is a white film. 5. The support for ink-jet recording according to claim 4, wherein the plastic film contains a large number of fine cavities and has an apparent specific gravity of 0.7 or more and less than 1.32. 6. The plastic film having an in-plane birefringence of-
The inkjet recording support according to any one of claims 1 to 5, wherein the support is 0.02 or more and +0.04 or less. 7. The ink-jet recording support according to claim 1, wherein an antistatic layer is provided on the surface of the plastic film opposite to the ink receiving layer. 8. An adhesive layer is provided on a surface of the plastic film opposite to the ink receiving layer.
The support for ink-jet recording according to any one of 1 to 6, above.