CN109863428A - Manufacturing method, polarizing film and the display device of optical film - Google Patents

Abstract

A kind of manufacturing method of optical film and polarizing film and display device using the optical film, the method includes providing the stripping process of multilayer film to lift-off processing, the multilayer film be include the film (A) being made of thermoplastic resin (A), with setting one or two surfaces of the film (A) film (B) multilayer film, the lift-off processing includes that temperature (Tov) (DEG C) is removed in a manner of applied force on the thickness direction in the film (A) from the film (A) by the film (B), the glass transition temperature (TgA) (DEG C) of the temperature (Tov) and the film (A) meet the relationship of Tov >=TgA, in the multilayer film, it is 0.03N/50mm or more and 0. in the film (A) of temperature Tov and the peeling force Pa of the film (B) 5N/50mm or less.

Description

Manufacturing method, polarizing film and the display device of optical film

Technical field

The present invention relates to the manufacturing method of optical film, polarizing film and display devices.

Background technique

In the display device of liquid crystal display device etc., it is widely current for the purpose of optical compensation etc. and is arranged with phase The optical film of the resin of difference.As the method for assigning phase difference to the film of resin, carry out drawing the film extensively It stretches.

As such optical film, it is sometimes desirable to NZ coefficient Nz meets the film of 0 < Nz < 1, the preferably film of 0.4 < Nz < 1, Further ideal is the film of Nz=0.5.However, when with usual way stretched film, since the value of NZ coefficient becomes smaller than 0 Value or the value bigger than 1, so hardly resulting in the film of 0 < Nz < 1.

Method as the film for obtaining 0 < Nz < 1, it is contemplated that using the multilayer film for being composed multiple films.However, needing The film of 0 < Nz < 1 is realized with simpler single layer structure.

As with monofilm come the method for realizing the film of 0 < Nz < 1, it is known to the method recorded in patent document 1.Special In sharp document 1, shrink film is fitted in the resin film of processing object, hereafter shrinks shrink film, thus shrinks resin film, It as a result is to realize 0 < Nz < 1.

Existing technical literature

Patent document

Patent document 1: (its corresponding other country announces Japanese Unexamined Patent Publication 08-207119 bulletin: European Patent Application Publication No. 0707938 specification).

Summary of the invention

Subject to be solved by the invention

However, in the method documented by patent document 1, it is difficult to control the convergent force of shrink film, and shrink shrink film Process it is miscellaneous, it is difficult to easily manufacture the film of 0 < Nz < 1.

Therefore, the optical film of the optical film of 0 < Nz < 1 can be easily manufactured the purpose of the present invention is to provide one kind Manufacturing method.It is a further object to provide a kind of can be easily manufactured and with high optical compensation function Polarizing film and the display device that can be easily manufactured and carry out high optical compensation.

Solution for solving the problem

The present inventor studies in order to solve described problem.As a result, the inventors discovered that as it is preceding not The manufacturing method of some optical films is stretched film and the peeling force using film, in a thickness direction on solving State problem.In turn, discovery is by will implement the temperature of stretching to the thickness direction and be supplied in the multilayer film of removing Characteristic is set as specific parameter, is able to carry out the operation stretched on good thickness direction.The present invention is based on such knowledge Opinion and complete.

That is, the present invention is as described below.

[1], a kind of manufacturing method of optical film, comprising: the stripping process of multilayer film is provided to lift-off processing,

The multilayer film be include the film (A) being made of thermoplastic resin A and setting at one of the film (A) or The multilayer film of the film (B) on two surfaces of person,

The lift-off processing include temperature Tov (DEG C) in a manner of applied force on the thickness direction in the film (A) from The film (A) removes the film (B),

The glass transition temperature Tg A (DEG C) of the temperature Tov and the film (A) meet the relationship of Tov >=TgA,

It is in the multilayer film, temperature Tov the film (A) and the film (B) peeling force Pa be 0.03N/50mm Above and 0.5N/50mm or less.

[2], the manufacturing method for the optical film recorded according to [1], wherein

The thermoplastic resin A contains the polymer of ester ring type structure.

[3], the manufacturing method for the optical film recorded according to [1] or [2], wherein

It further include the stretching process for being just pulled up the multilayer film in its face.

[4], a kind of polarizing film, the light including the polarizer and the manufacturing method manufacture recorded by any one of [1]~[3] Learn film.

[5], a kind of display device, the optical film including the manufacturing method manufacture recorded by any one of [1]~[3].

Invention effect

According to the present invention, the manufacturing method of the optical film, optical film of being capable of 0 < Nz < 1 easy to manufacture is provided；It can hold Easily manufacture and the polarizing film with high optical film compensation function；And can be easy to manufacture and form high optical compensation Display device.

Detailed description of the invention

Fig. 1 is to schematically show the stripping off device of progress stripping process in the manufacturing method of the present invention and use the device One exemplary side view of the operation of stripping process.

Fig. 2 is to schematically show the stripping off device of progress stripping process in the manufacturing method of the present invention and use the device Another exemplary side view of the operation of stripping process.

Specific embodiment

Embodiment and illustrative material described below and the present invention is described in detail.But the present invention is not limited to Embodiment and illustrative material as shown below, in the range of not departing from the range and its equivalency range of Patent request of the invention It can arbitrarily change to implement.

In the following description, in the face of film retardation Re as long as no special instructions, then to be indicated by Re=(nx-ny) × d Value, the retardation Rth of the thickness direction of film as long as no special instructions, then to be indicated by Rth={ (nx+ny)/2-nz } × d Value.In addition, the NZ coefficient of film is the value indicated by Nz=(nx-nz)/(nx-ny), also referred to as Nz=(Rth/Re)+ 0.5.Here, nx indicates direction on the direction vertical with direction, that is, thickness direction in face of film, assigning maximum refractive index Refractive index.Ny indicates the refractive index in the direction orthogonal with the direction of nx in the face on direction.Nz indicates thickness direction Refractive index.The thickness of d expression film.It measures wavelength as long as no special instructions, is then 590nm.

In the following description, " polarizing film " includes not only hard component, but also include example as long as no special instructions As the film of resin has flexible component in this wise.

In the following description, the film of " strip " refers to the film for the length for being 5 times or more relative to width, preferably has There are 10 times or the length more than it, specifically refers to and carry out keeping or the length of degree carried with being wound into roll Film.The upper limit of the length of the film of strip is not particularly limited, such as can be set as relative to width being 100,000 times or less.

In this technical field, " stretching " of film means usually in the face of film on the more than one direction in direction The operation for deforming film in a manner of keeping the shape of film widened.However, in this application, " stretching " of film is without being limited thereto, also wrap It includes so that the shape of film is on direction (the nonparallel direction in face direction with film, such as thickness direction etc.) in face other than direction The operation that widened mode deforms film.In the following description, within a context in clear situation, will be common so that film Shape into the face of film the widened mode in more than one direction in direction make film deform operation referred to as " stretch ".It is another Aspect is distinguished with such common " stretching ", will be in a manner of keeping direction of the shape of film into face other than direction widened The processing for deforming film is known as " thickness direction stretching ", will be known as " thickness direction stretched film " by the film handled in this way.

[manufacturing methods of 1. optical films]

The manufacturing method of optical film of the invention includes that specific multilayer film is supplied to the removing of specific lift-off processing Process.

[1.1 multilayer film]

The multilayer film provided to stripping process is to include the film (A) being made of thermoplastic resin A and setting the one of film (A) The multilayer film of a or two surfaces film (B).

[1.1.1 film (A)]

The thermoplastic resin A for constituting film (A) is not particularly limited, and the institute selected as one sees fit Fu Yus as optical film can be used The physical property needed, resin containing various polymer.

As the preferable example of the polymer included in thermoplastic resin A, the polymer of the structure containing ester ring type can be enumerated.

The polymer of the structure containing ester ring type is the polymer in repetitive unit with ester ring type structure, is able to use in master Polymer containing ester ring type structure in chain and the polymer in the side chain containing ester ring type structure it is any.Knot containing ester ring type Structure polymer includes crystalline resin and amorphism polymer.From obtain effect desired by the present invention viewpoint and manufacture at From the perspective of this, the preferred polymer of amorphism structure containing ester ring type.

Ester ring type structure possessed by polymer as amorphism structure containing ester ring type, for example, cycloalkane knot can be enumerated Structure, cycloolefin structure etc., but the preferred cycloalkanes hydrocarbon structure from the viewpoint of thermal stability etc..

The carbon atom number for constituting the repetitive unit of an ester ring type structure is not particularly limited, usually 4~30, excellent Select 5~20, more preferable 6~15.

The ratio of the repetitive unit with ester ring type structure in the polymer of the structure containing ester ring type is according to using purpose suitable Locality selects, usually 50 weight % or more, preferably 70 weight % or more, more preferably 90 weight % or more.By making to have There is the repetitive unit of ester ring type structure to be above-mentioned more like that, so as to improve the heat resistance of base material film.

The polymer of the structure containing ester ring type, can specifically enumerate: (1) norbornene polymer, (2) monocycle cyclic olefin Polymer, (3) cyclic conjugated diene polymer, (4) alicyclic vinyl ring type hydrocarbon polymer and their hydride etc..At these In, from the viewpoint of the transparency and mouldability, more preferable norbornene polymer and their hydride.

As norbornene polymer, can enumerate for example: the ring-opening polymerization polymer of norbornene monomer, norbornene monomer and It is capable of the ring-opening copolymer and their hydride of other monomers of ring opening copolymer；The addition polymer of norbornene monomer, The addition copolymer etc. of norbornene monomer and the other monomers that can be copolymerized.It is special from the viewpoint of the transparency in these The ring-opening polymerization polymer hydride of not preferred norbornene monomer.

The example of polymer as the above-mentioned structure containing ester ring type can enumerate such as Japanese Unexamined Patent Publication 2002-321302 Polymer disclosed in bulletin.

In addition, the example of the polymer as the crystalline structure containing ester ring type, can enumerate such as Japanese Unexamined Patent Publication 2016- Polymer disclosed in No. 26909 bulletins.

It as other examples of the polymer contained by thermoplastic resin A, can enumerate: triacetyl cellulose, polystyrene The general polymer such as based polymer.Particularly, in polystyrenic polymer, particularly preferably using poly- with isostructure Styrenic.The example of polystyrenic polymer with isostructure can enumerate Japanese Unexamined Patent Publication 2014-186273 Polymer disclosed in number bulletin.The weight average molecular weight of polymer contained by thermoplastic resin A is not particularly limited, excellent 10000 or more, more preferably 20000 or more are selected as, on the other hand preferably 300000 hereinafter, more preferably 250000 or less. When weight average molecular weight in the range in the case where, mechanical strength and the excellent thermoplasticity of molding processibility can be easy to get Resin A.

Thermoplastic resin A can also be only made of the polymer formed as main component equal as described above, but only Otherwise effect of the invention is significantly damaged, also may include arbitrary compounding agent.Make polymer as main component in resin Ratio be preferably 70 weight % or more, more preferable 80 weight % or more.

As thermoplastic resin A, can properly select to use has desired characteristic in various commercially available commodity Thermoplastic resin.It as such commercially available example, can enumerate: trade name " ZEONOR " (Zeon Corp's system), quotient The product group of the name of an article " TOPAS " (Polyplastics Co., Ltd. system) trade name " ARTON " (JSR Corporation system).

The glass transition temperature Tg A of thermoplastic resin A is preferably 100 DEG C or more, more preferably 110 DEG C or more, another Aspect is preferably 180 DEG C hereinafter, more preferably 170 DEG C or less.When TgA is in the case where the range, thickness side is successfully carried out To the processing of stretching etc., the optical film with desired optics bulk properties can be easy to get.

The thickness of film (A) is preferably 10 μm or more, and more preferably 20 μm or more, be on the other hand preferably 200 μm hereinafter, more Preferably 190 μm or less.When the thickness of film (A) is in the case where such range, thickness direction stretching etc. is successfully carried out Processing, can be easy to get the optical film with desired optics bulk properties.

The method of manufacture film (A) is not particularly limited, and arbitrary manufacturing method can be used.For example, can be by by thermoplastic Property Resin A is shaped to desired shape to manufacture film (A).As for by the preferable example of the molding forming method of Resin A, Extrusion forming can be enumerated.By carrying out extrusion forming, the film (A) with desired size can be effectively manufactured.

[1.1.2. film (B)]

It as the material for constituting film (B), is not particularly limited, can suitably select using being suitable for the embodiment of the present invention Resin containing various polymer.Hereinafter, the resin is only called " resin B ".

As resin B, thermoplastic resin can be used.Example and its molecular weight as polymer contained by resin B Preferred scope can enumerate: with above as the polymer and other polymer contained by thermoplastic resin A containing ester ring type Example and the example same example enumerated.

The further example of polymer as the structure containing ester ring type for including in resin B, can enumerate following hydrogen Change block copolymer, which includes 2 or more of the hydrogenation of compounds object unit [I] with the alkyl containing ring type Polymer blocks and the combination with chain hydrocarbon hydrogenation of compounds object unit [II] or unit [I] and unit [II] one A above polymer blocks.As the specific example of such hydrogenated block copolymer, for example, International Publication No. can be enumerated Polymer disclosed in No. WO2016/152871.

As the further example for the polymer for including in resin B, polypropylene, (methyl) acrylic ester polymerization can be enumerated The polymers for general use of object, polyimides etc..As resin B, can properly select to use has institute's phase in various commercially available commodity The resin of the characteristic of prestige.As the example of such commercial product, can enumerate self adhesion stretched polypropylene films (such as Futamura Chemical Co., Ltd system, trade name " FSA 010M#30 ").

The thickness of film (B) is preferably 10 μm or more, and more preferably 15 μm or more, be on the other hand preferably 100 μm hereinafter, more Preferably 90 μm or less.When the thickness of film (B) is in the case where such range, the place of thickness direction stretching etc. is successfully carried out Reason, can be easy to get the optical film with desired optics bulk properties.

The method of manufacture film (B) is not particularly limited, and arbitrary manufacturing method can be used.For example, by by resin B at Type is desired shape to manufacture film (B).As for that can enumerate the preferable example of the molding forming method of resin B crowded It is molded.By carrying out extrusion forming, the film (B) with desired size can be effectively manufactured.

[1.1.3. others layer]

Multilayer film also may include arbitrary layer other than film (A) and film (B).For example, may include adhesive phase.As The adhesive for constituting adhesive phase, can be used commercially available various adhesives.Specifically, make polymer as main component, it can Use the adhesive comprising acryl polymer.For example, can be by adhesive phase from the film (example with commercially available adhesive phase Such as, rattan lumber industry manufacture " Master stack series ") it is transferred to film (A) or film (B), the adhesive being used as in multilayer film Layer.

In the case where multilayer film has adhesive phase between film (A) and film (B), preferably to such adhesive phase The bonding force that the bonding force of film (B) compares film (A) is high.By the difference with such bonding force, can reduce on optical film Adhesive residue, be easy to get the optical film of high-quality.The difference of such bonding force can be by properly selecting adhesive phase Material is implemented suitable surface treatment on the surface of film (A) and film (B) as needed and is obtained.

[1.1.4 peeling force]

In the manufacturing method of the present invention, as multilayer film, using in the film (A) of temperature Tov and the peeling force Pa of film (B) For the multilayer film of the value in particular range.Here, temperature Tov is the temperature of the film in the stripping process of the manufacturing method of the present invention Degree.

Peeling force Pa is 0.03N/50mm or more, preferably 0.035N/50mm or more, more preferable 0.04N/50mm, another party Face is 0.5N/50mm hereinafter, it is preferred that 0.4N/50mm is hereinafter, more preferably 0.3N/50mm or less.By peeling force in such model In enclosing, it is able to suppress the generation of the fold in the process until stripping process, is inhibited in the stage before stripping process The removing of the film (B) of non-purpose, and realize the good removing on the surface of film (A), successfully manufacture good quality Optical film.

Peeling force Pa can be acquired and carrying out 180 ° of disbonded tests to multilayer film.180 ° of disbonded tests can be as follows Implemented: cutting multilayer film, long dimension direction × width direction=300mm × 50mm slice is made, it is permanent to be put into band constant temperature The cupping machine (such as instron corporation " 5564 type ") of wet sump is implemented in temperature Tov.Specifically, measurement dress can be used The chuck holding film (A) for setting side implements removing with another chuck holding film (B) with the condition of tensile speed 300mm/min Test.

[preparation method of 1.1.5. multilayer film]

Method prepared by the multilayer film that opposite the manufacturing method of the present invention provides is not particularly limited, and be can be used and is appointed The method of meaning.The preparation example such as can be by carrying out film (A) and film (B) fitting.It, as needed, can before fitting The surface treatment of sided corona treatment etc. is carried out to film (A) and/or film (B).In addition, before fitting, as needed, film (A) and/ Or the surface of film (B) forms adhesive phase, and is bonded via the adhesive phase.Fitting can be by making the film (A) of strip It is aligned in long dimension direction with the film (B) of strip and is carried out by roll-to-roll be bonded.

[1.2. stripping process]

In stripping process in the manufacturing method of the present invention, multilayer film is provided to lift-off processing.Lift-off processing include from The process that film (A) removes film (B).By carrying out such lift-off processing, can apply film (A) in a thickness direction The power of traction, as a result, the thickness direction that can complete film (A) stretches.There is the case where film (B) of multilayer in multilayer film Under, the film (B) of multilayer is usually removed simultaneously.

Fig. 1 be schematically show carry out the manufacturing method of the present invention in stripping process stripping off device and use the device Stripping process operation an exemplary side view.In Fig. 1, the multilayer film 100 of strip is defeated along the direction arrow A11 It send, later, is supplied to stripping process at stripping area P.

Stacked film 100 includes: film (A) 131, film (A) 131 a surface be arranged film (B) 111, in film (A) 131 Another surface setting film (B) 112.Stacked film 100 is also comprising 121 He of adhesive phase between insertion film (A) and (B) 122.The thickness of film (A) 131 in multilayer film is shown with arrow A14.

The processing of removing in stripping process by by film (B) in the direction different from direction in the face of the film of conveying (A) Upper traction is to carry out.In the example of fig. 1, in stripping area P, by film (B) 111 along its long dimension direction to arrow A12 Direction traction, and film (B) 112 is drawn along its long dimension direction to the direction arrow A13.As a result, from the conveying side of multilayer film To downstream removed towards upstream, can be by film (B) 111 and 112 in the side of the thickness direction applied force of film (A) 131 Formula removing.The power of the thickness direction of film mentioned here refers to the power in the nonparallel direction in direction in the face with film, is preferably close to With the direction of the surface vertical direction of film.Such stripping process as a result, the optical film that thickness direction is stretched can be obtained 132.In addition, by making the tractive force in the direction arrow A12 and the tractive force balance in the direction arrow A13, it can be to 100 He of multilayer film Optical film 132 does not assign the tension in direction in undesirable face and carries out these tractions.

In the example of fig. 1, the thickness of optical film 132 is indicated with arrow A15.Optical film 132 stretches in a thickness direction Result be that there is the thickness thicker than the film (A) 131 in multilayer film 100.But the manufacturing method of the present invention is without being limited thereto.For example, In the case where stripping process is along with the stretching in direction into face, the thickness of optical film is not necessarily thicker than the thickness of film (A), i.e., Make in this case, it is also possible to there is the case where optical film that can obtain 0 < Nz < 1.

In the further quilt on the direction arrow A11 of result optical film 132 obtained of the stripping process in stripping area P Conveying.Multilayer film 100 and optical film 132 are in the pressure roller 151 and 152 of stripping area upstream and the pressure roller in stripping area downstream 161 and 162 hold in the state of conveyed.Conveying speed is adjusted by suitably adjusting the peripheral speed of these pressure rollers.

In addition, the peripheral speed of the pressure roller to downstream can be adjusted to the speed faster than the peripheral speed of upper pressure roller as needed. By carrying out such adjusting, desired tension can be assigned to multilayer film 100 and optical film 132.If it is required, then passing through Such tension is adjusted, the stretching process to film long dimension direction with stripping process is able to carry out.It in turn, can also basis Need to carry out the drawing towards the arbitrary direction in film surface in the upstream or downstream of stripping area P together with stripping process It stretches.

In the manufacturing method of optical film of the invention, other than thickness direction stretches also in carry out face direction stretching In the case where stretching ratio can cooperate requirement assign optical film desired optical property come suitably adjust.It is specific to stretch Multiplying power is preferably 1 times or more, and more preferably 1.01 times or more, be on the other hand preferably 2 times hereinafter, more preferably 1.8 times or less. In the case that the stretching ratio in direction is such range in face, required optical property can be easy to get.

In the case that multilayer film in stripping off device for strip continuously carries out stripping process, by making multilayer film Stripping area P can be set in the position with stripping off device by the velocity balance of conveying speed and removing.In such case Under, the conveying speed of multilayer film becomes peeling rate.Peeling rate can cooperate requirement to assign the desired optical of optical film It can suitably adjust.Specific peeling rate is preferably 1m/ minutes or more, and more preferably 2m/ minutes or more, on the other hand preferably For 50m/ minutes hereinafter, more preferably 40m/ minutes or less.Peeling rate can be easy to get in the case where such range Desired optical property.

In the manufacturing method of optical film of the invention, stripping process is carried out at temperature Tov (DEG C).Temperature Tov and film (A) Glass transition temperature Tg A (DEG C) meet the relationship of Tov >=TgA.Tov preferably (TgA+3) DEG C or more, more preferably (TgA + 5) DEG C or more.By the way that Tov is adjusted to such range, can be easy to assign optical film the light of desired NZ coefficient etc. Learn characteristic.The upper limit of Tov is not particularly limited, such as (TgA+40) DEG C can be set as or less.Temperature Tov in stripping process can lead to It crosses and utilizes heating device appropriate by the temperature in the baking oven (not shown) for surrounding the region comprising stripping area in stripping off device It is heated to adjust.

Fig. 2 be schematically illustrate carry out the manufacturing method of the present invention in stripping process stripping off device and use the device Stripping process operation another exemplary side view.In Fig. 2, the multilayer film 200 of strip quilt on the direction arrow A21 Conveying, later, is supplied to stripping process at stripping area P.Stacked film 200 includes film (A) 231 and at one of film (A) 231 The film (B) 211 of surface setting, is not provided with film (B) on another surface of film (A) 231.Stacked film 200 is also comprising insertion film (A) Adhesive phase 221 between (B).The thickness of film (A) 231 in multilayer film is shown with arrow A24.

In this example, since multilayer film 200 only has film (B) 211 in one surface, the stripping in stripping process From processing be that this is pulled up by the side of the arrow A22 in the different direction in the direction in the face as the film (A) from conveying Film (B) 211 carries out.Therefore, pass through the pressure roller 151 and 152 of stripping area upstream and the pressure roller 161 in stripping area downstream With 162, tension is assigned to the optical film 232 after multilayer film 200 and stripping process, leading for film (B) 211 is fought by the tension Draw.Such stripping process as a result, film (A) 231 is stretched in a thickness direction and can obtain optical film 232.Optical film 232 have thickness that is thicker than film (A) 231, being indicated with arrow A25.

[2. optical film]

Manufacturing method according to the invention, can its NZ coefficient Nz easy to manufacture be 0 < Nz < 1 optical film.Nz is preferably 0.4 < Nz < 1, it is generally desirable to Nz=0.5.Optical film with such NZ coefficient is difficult to through common film the direction into face The purpose of stretching to manufacture, but being effectively used for the optical compensation of display device.Therefore, the manufacturing method of the present invention is from can Difficult manufacture easy to manufacture and useful product it is such from the perspective of played very high effect.

Postponing Re in the face of optical film is preferably 100nm or more, on the other hand more preferably 120nm or more is preferably 350nm is hereinafter, more preferably 300nm or less.Re can be constituted in the case where such range and be efficiently used for optical compensation Deng purposes optical film.The delay Rth of the thickness direction of optical film preferably -80nm or more, more preferably -70nm or more, It on the other hand is preferably 80nm hereinafter, more preferably 70nm or less.In the case where Re is such range, can constitute has The optical film of the characteristic of desired Nz coefficient etc. and the purposes for being efficiently used for optical compensation etc..

[purposes of 3. optical films: polarizing film and display device]

The optical film that manufacturing method through the invention obtains can be used as the composition element of the Optical devices of display device etc. And it uses.For example, the optical component that can be combined and constitute polarizing film optical film and other components etc..

Polarizing film of the invention has the optical film and the polarizer manufactured by the manufacturing method of the present invention.The present invention Polarizing film can be manufactured by optical film and polarizer fitting.

Before being bonded with polarizing film, in the settable arbitrary layer in the surface of optical film.It, can as the example of arbitrary layer It enumerates: improving the hard conating of the surface hardness of film, makes the good felt of the slickness of film (mat) layer and anti-reflection layer.

Polarizing film of the invention can also further include for bonding them between the film and the polarizer cut from optical film Adhesive phase.

The polarizer is not particularly limited, and the arbitrary polarizer can be used.As the example of the polarizer, can enumerate makes poly- second Alkenyl alcohol film carries out the polarizer obtained from stretch process after adsorbing the materials such as iodine, dichroic dye.As composition adhesive The adhesive of layer can be enumerated using various polymer as the adhesive of basic polymer.As showing for such base polymer Example, can enumerate such as acrylic acid series polymeric compounds, organosilicon polymer, polyester, polyurethane, polyethers and synthetic rubber.

Polarizing film can have protective film.The quantity of the polarizer and protective film that polarizing film has is arbitrary, but the present invention Polarizing film could generally have 1 layer the polarizer and two surface setting 2 layers of protective film.Such 2 layers of protection Two sides in film can be the film cut from optical film of the invention, can also only a side therein be from optical film of the invention The film cut.

Display device of the invention can have the optical film manufactured by the manufacturing method of the present invention.Of the invention is aobvious Showing device preferably has the polarizing film of the invention.Display device of the invention can be by by optical film of the invention and display The other of device constitute element combination and suitably constitute.

Display device of the invention is preferably liquid crystal display device.As liquid crystal display device, for example, can enumerate with example Such as coplanar switch (IPS) mode, vertical arrangement (VA) mode, Multi-domain Vertical arrangement (MVA) mode, the arrangement of continuous fireworks shape (CPA) mode, mixing arrangement nematic (HAN) mode, twisted-nematic (TN) mode, super twisted nematic (STN) mode, optics are mended Repay the liquid crystal display device of the liquid crystal cells of driving methods such as bending (OCB) mode.

In the case where display device of the invention is liquid crystal display device, polarizing film be can be used as from being incident on liquid crystal The light of unit and from liquid crystal cells emit light in be only arranged the layer of desired specific polarized light transmission.Polarizing film is also A part of composition element as the reflection for preventing exterior light is arranged.

Display device of the invention can also be organic electroluminescence display device and method of manufacturing same.In this case, for example, described The polarizing film of invention is arranged as a part of the composition element of the reflection for preventing exterior light.

Embodiment

The present invention is specifically described hereinafter, showing embodiment.But the present invention is not limited to implementations as shown below Example can be deformed arbitrarily in the range of not departing from the range and its equivalent range of Patent request of the invention to implement.

In the following description, " % " and " part " of expression amount is then weight basis as long as no special instructions.In addition, following The operation of explanation as long as no special instructions, then carries out under conditions of room temperature and normal pressure.

[evaluation method]

(measurement method of the glass transition temperature of resin)

The particle for preparing the resin of measurement object, uses differential scanning calorimetry (Seiko Instruments system [DSC6220]) measure the glass transition temperature of its resin particle.Condition be set as example weight 10mg, 20 DEG C of heating rate/ Minute.

(measurement method of phase difference and NZ coefficient)

Using the phase difference measuring apparatus (Axometric corporation, ProductName " Axoscan ") of wavelength 590nm to Re and Rth is measured, and NZ coefficient is found out based on these.

(measurement method of the peeling force Pa between film (A) and film (B))

The multilayer film of the strip of measurement object is cut, long dimension direction × width direction=300mm × 50mm is obtained Slice.Slice is put into the cupping machine (instron corporation " 5564 type ") with constant temperature and humidity cabinet, is warming up to defined baking Box temperature degree Tov.In the state of maintaining the temperature, 180 ° of disbonded tests are carried out.180 ° of disbonded tests are with measuring device side Chuck holding film (A) implemented under conditions of tensile speed 300mm/min with another chuck holding film (B).Using steady Value of the average value of the measured value of peeling force Pa (N/50mm) at fixed stretching distance 50mm as peeling force Pa.

[manufacture of 1. film of Production Example (A) -1]

Make the resin (tree for the norbornene polymer that 126 DEG C of glass transition temperature of the polymer of the structure containing ester ring type Rouge, trade name " ZEONOR " Zeon Corp system) particle it is 5 hours dry at 100 DEG C.Later, by the tree after drying The particle of rouge is provided to uniaxial extruder.After making resin melting in extruder, by polymer pipe and polymer filter, Slabbing and cooling are squeezed out on casting drum from T mold.The film (A)-of the strip of 80 μm of thickness, width 1000mm is obtained as a result, 1.The film (A) -1 of manufacture is wound into roll and recycles.

[manufacture of 2. film of Production Example (A) -2]

Other than changing the opening width of die orifice of T mold, operation identical with Production Example 1 is carried out.It obtains as a result, thick The film (A) -2 of the strip of 185 μm of degree, width 1000mm, is wound into roll and recycles.

[manufacture of 3. film of Production Example (A) -3]

Other than changing the opening width of die orifice of T mold, operation identical with Production Example 1 is carried out.It obtains as a result, thick The film (A) -3 of the strip of 133 μm of degree, width 1000mm, is wound into roll and recycles.

[manufacture of 4. film of Production Example (A) -4]

The film (A) -1 obtained in Production Example 1 is unreeled from roller, implements sided corona treatment on two surfaces of film (A) -1.By This, obtains film (A) -4.The film (A) -4 of acquisition makes sided corona treatment face become volume inside and is wound into roll and recycles.

[manufacture of the raw material film of 5. film of Production Example (B)]

The particle of polyester resin (Eastman corporation " PET-G6763 ") is 5 hours dry at 120 DEG C.After drying Particle is supplied to extruder, its melting is made in extruder, and polymer pipe and polymerization are passed through under conditions of 260 DEG C of resin temperature Object filter squeezes out slabbing and cooling on casting drum from T mold.The raw material of 60 μm of thickness, width 1400mm are obtained as a result, Film.

[manufacture of 6. film of Production Example (B) -1]

The raw material film obtained in Production Example 5 is continuously supplied into the transverse drawing mill of tentering formula.It is laterally drawn using this Machine is stretched, under conditions of 80 DEG C of draft temperature, 2 times of stretching ratio, raw material film is stretched in wide dimensional directions.After stretching The both ends of film width direction are trimmed, and further implement sided corona treatment on the surface of side.Thickness 900mm, thickness 42 are obtained as a result, μm strip film (B) -1.The film (B) makes sided corona treatment face become volume inside and is wound into roll and recycles.

[manufacture of 7. multilayer film of Production Example (C) -1]

The film (B) -1 obtained in Production Example 6 is unreeled from roller, by adhesive phase (for example, rattan lumber's industry system " Master The adhesive phase of stack series ") it is transferred to the surface for implementing sided corona treatment of film (B) -1.In turn, it is obtained in Production Example 1 Two surfaces of film (A) -1 film (B) -1 is bonded in conventional manner by adhesive phase.There is (film (B)-as a result, 1)/(adhesive phase)/(film (A) -1)/(adhesive phase)/(film (B) -1) layer structure, strip multilayer film (C) -1.This is more Tunic (C) -1 is wound into roll and recycles.The thickness of each layer is 42 μm/25 μm/80 μm/25 μm/42 μm.

[manufacture of 8. multilayer film of Production Example (C) -2]

The film (B) -1 obtained in Production Example 6 is unreeled from roller, makes adhesive phase (for example, rattan lumber's industry system " Master The adhesive phase of stack series ") it is transferred to the surface for implementing sided corona treatment of film (B) -1.In turn, it is obtained in Production Example 4 Two surfaces of film (A) -4 film (B) -1 is bonded in conventional manner by adhesive phase.There is (film (B)-as a result, 1)/(adhesive phase)/(film (A) -4)/(adhesive phase)/(film (B) -1) layer structure, strip multilayer film (C) -2.This is more Tunic (C) -2 is wound into roll and recycles.The thickness of each layer is 42 μm/25 μm/80 μm/25 μm/42 μm.

[manufacture of 9. multilayer film of Production Example (C) -3]

As film (B) -2, prepare self adhesion stretched polypropylene films (such as Futamura Chemical Co., Ltd system, Trade name " FSA 010M#30 ").Film (B) -2 is pasted on two surfaces of the film (A) -1 obtained in Production Example 1 in conventional manner It closes.There is (film (B) -2)/(film (A) -1)/(film (B) -2) layer structure, strip multilayer film (C) -3 as a result,.It should Multilayer film (C) -3 is wound into roll and recycles.The thickness of each layer is 30 μm/80 μm/30m.

[manufacture of 10. multilayer film of Production Example (C) -4]

Other than replacing film (A) -1 and using the film (A) -2 obtained in Production Example 2, by identical with Production Example 9 Operation, is had (film (B) -2)/(film (A) -2)/(film (B) -2) layer structure, strip multilayer film (C) -4.The multilayer Film (C) -4 is wound into roll and recycles.The thickness of each layer is 30 μm/185 μm/30m.

[manufacture of 11. multilayer film of Production Example (C) -5]

Other than replacing film (A) -1 and using the film (A) -3 obtained in Production Example 3, by identical with Production Example 9 Operation, is had (film (B) -2)/(film (A) -3)/(film (B) -2) layer structure, strip multilayer film (C) -5.The multilayer Film (C) -5 is wound into roll and recycles.The thickness of each layer is 30 μm/133 μm/30m.

[manufacture of 12. multilayer film of Production Example (C) -6]

The film (B) -6 obtained in Production Example 6 is unreeled from roller, makes adhesive phase (for example, rattan lumber's industry system " Master The adhesive phase of stack series ") it is transferred to the surface for implementing sided corona treatment of film (B) -1.In turn, in the bonding transferred Implement sided corona treatment in the surface of oxidant layer.Two surfaces of the film (A) -4 obtained in Production Example 4, by adhesive phase with routine Method fitting has the film (B) -1 for the adhesive phase for implementing sided corona treatment.There is (film (B) -1)/(adhesive as a result, Layer)/(film (A) -4)/(adhesive phase)/(film (B) -1) layer structure, the multilayer film (C) -6 of strip.The multilayer film (C) -6 It is wound into roll and recycles.The thickness of each layer is 42 μm/25 μm/80 μm/25 μm/42 μm.

[embodiment 1]

Prepare floating type longitudinal stretching machine.The stretching-machine is in the baking oven for having adjusted temperature by the film of the strip of conveying The stretching-machine stretched in its long dimension direction.The multilayer film (C) -2 obtained in Production Example 8 is unreeled from roller, in the long size of film Side is delivered up, and is supplied to the longitudinal stretching machine.Multilayer film (C) -2 is conveyed in the baking oven of longitudinal stretching machine.? When conveying, oven temperature Tov is set as 135 DEG C, is stretched again with stretching ratio 1.07.

In turn, the near exit in baking oven carries out stripping process.Stripping process is to carry out in the following manner: traction is more The film (B) -1 of the two sides of tunic (C) -2 is continuously removed from -4 pairs of films (B) -1 of film (A).The direction for drawing 2 films (B) -1 is set For the film (A) -4 perpendicular to conveying surface and opposite directions.It is carried out on the thickness direction of film (A) -4 as a result, The removing of applied force stretches film (A) -4 in a thickness direction.Peeling rate is 5m/min.As a result, obtaining thickness side The film (A) -4 being stretched upwards is used as optical film.

It measures and postpones Re, thickness and NZ coefficient in the face of the optical film obtained.In addition, measure the embodiment in Tov Multilayer film in film (A) and film (B) between peeling force Pa.Result is shown in table 1.As can be known from the results of Table 1, it obtains Optical film NZ coefficient be 0 to 1 between.

[embodiment 2]

The multilayer film (C) -3 obtained in Production Example 9 is unreeled from roller, and is conveyed in long dimension direction, is supplied to and real Apply the identical longitudinal stretching machine of stretching-machine used in example 1.Multilayer film (C) -3 is conveyed in the baking oven of longitudinal stretching machine.? When conveying, oven temperature Tov is set as 126 DEG C.Furthermore stretching ratio is set as 1.00 times, that is, carries out being not accompanied by the defeated of stretching It send.

In turn, the near exit in baking oven carries out stripping process.Stripping process is to carry out in the following manner: traction is more The film (B) -2 of the two sides of tunic (C) -3 is continuously removed from -1 pair of film (B) -2 of film (A).The direction for drawing 2 films (B) -2 is set For the film (A) -1 perpendicular to conveying surface and opposite directions.It is carried out on the thickness direction of film (A) -1 as a result, The removing of applied force stretches film (A) -1 in a thickness direction.Peeling rate is 1m/min.As a result, obtaining thickness side The film (A) -1 being stretched upwards is used as optical film.

It measures and postpones Re, thickness and NZ coefficient in the face of the optical film obtained.In addition, measure the embodiment in Tov Multilayer film in film (A) and film (B) between peeling force Pa.Result is shown in table 1.As can be known from the results of Table 1, it obtains Optical film NZ coefficient be 0 to 1 between.

[embodiment 3]

In addition to oven temperature Tov is changed into 130 DEG C from 126 DEG C, stretching ratio is changed into 1.02 times from 1.00 times, And except being stretched, by operation same as Example 2, obtains optical film and evaluated.Removing in stripping process Speed is 1m/min.Result is shown in table 1.As can be known from the results of Table 1, the NZ coefficient of the optical film of acquisition be 0 to 1 it Between.

[embodiment 4]

The multilayer film (C) -4 obtained in Production Example 10 is unreeled from roller, is conveyed in long dimension direction, is supplied to and implements The identical longitudinal stretching machine of stretching-machine used in example 1.Multilayer film (C) -4 is conveyed in the baking oven of longitudinal stretching machine.Defeated When sending, oven temperature Tov is set as 135 DEG C, is stretched again with stretching ratio 1.07.

In turn, the near exit in baking oven carries out stripping process.Stripping process is to carry out in the following manner: traction is more The film (B) -2 of the two sides of tunic (C) -4 is continuously removed from -2 pairs of films (B) -2 of film (A).The direction for drawing 2 films (B) -2 is set For the film (A) -2 perpendicular to conveying surface and opposite directions.It is carried out on the thickness direction of film (A) -2 as a result, The removing of applied force stretches film (A) -2 in a thickness direction.Peeling rate is 1m/min.As a result, obtaining in thickness side The film (A) -2 being stretched upwards is used as optical film.

It measures and postpones Re, thickness and NZ coefficient in the face of the optical film obtained.In addition, measure the embodiment in Tov Multilayer film in film (A) and film (B) between peeling force Pa.Result is shown in table 1.As can be known from the results of Table 1, it obtains Optical film NZ coefficient be 0 to 1 between.

[embodiment 5]

In addition to oven temperature Tov is changed into 135 DEG C from 126 DEG C, stretching ratio is changed into 1.07 times from 1.00 times, And except being stretched, by operation same as Example 2, obtains optical film and evaluated.Removing in stripping process Speed is 5m/min.Result is shown in table 1.As can be known from the results of Table 1, the NZ coefficient of the optical film of acquisition be 0 to 1 it Between.

[embodiment 6]

The multilayer film (C) -5 obtained in Production Example 11 is unreeled from roller, is conveyed in long dimension direction, and is supplied to and reality Apply the identical longitudinal stretching machine of stretching-machine used in example 1.Multilayer film (C) -5 is conveyed in the baking oven of longitudinal stretching machine.? When conveying, oven temperature Tov is set as 140 DEG C, is stretched again with stretching ratio 1.07.

In turn, the near exit in baking oven carries out stripping process.Stripping process is to carry out in the following manner: traction is more The film (B) -2 of the two sides of tunic (C) -5 is continuously removed from -3 pairs of films (B) -2 of film (A).The direction for drawing 2 films (B) -2 is set For the film (A) -3 perpendicular to conveying surface and opposite directions.It is carried out on the thickness direction of film (A) -3 as a result, The removing of applied force stretches film (A) -3 in a thickness direction.Peeling rate is 1m/min.As a result, obtaining in thickness side The film (A) -3 being stretched upwards is used as optical film.

It measures and postpones Re, thickness and NZ coefficient in the face of the optical film obtained.In addition, measure the embodiment in Tov Multilayer film in film (A) and film (B) between peeling force Pa.Result is shown in table 1.As can be known from the results of Table 1, it obtains Optical film NZ coefficient be 0 to 1 between.

[comparative example 1]

The multilayer film (C) -1 obtained in Production Example 7 is unreeled from roller, is conveyed in long dimension direction, and is supplied to and reality Apply the identical longitudinal stretching machine of stretching-machine used in example 1.Multilayer film (C) -1 is conveyed in the baking oven of longitudinal stretching machine.? When conveying, oven temperature Tov is set as 135 DEG C, is stretched again with stretching ratio 1.07.

In turn, it attempts the near exit in baking oven and carries out stripping process, but reach the near exit in baking oven The peeling that film (B) -1 is generated in multilayer film (C) -1 generates fold in the whole surface of film (A) -1, not can be carried out stripping process.

In addition, measuring the peeling force Pa between the film (A) in the multilayer film of Tov and film (B) of the embodiment.It will knot Fruit is shown in table 1.

[comparative example 2]

The multilayer film (C) -6 obtained in Production Example 12 is unreeled from roller, is conveyed in long dimension direction, and is supplied to and reality Apply the identical longitudinal stretching machine of stretching-machine used in example 1.Multilayer film (C) -6 is conveyed in the baking oven of longitudinal stretching machine.? When conveying, oven temperature Tov is set as 135 DEG C, is stretched again with stretching ratio 1.07.

In turn, it attempts the near exit in baking oven and carries out stripping process, but without successfully carrying out film (A) and adhesive The removing of the boundary of layer, the remained on surface adhesive of the film (A) after removing not can be carried out the manufacture of good optical film.

In addition, measuring the peeling force Pa between the film (A) in the multilayer film of Tov and film (B) of the embodiment.It will knot Fruit is shown in table 1.

[comparative example 3]

In addition to by oven temperature Tov from 126 DEG C change into 120 DEG C other than, by operation same as Example 2, obtain It obtains optical film and is evaluated.Peeling rate in stripping process is 5m/min.Result is shown in table 1.From the result of table 1 It is found that the NZ coefficient of the optical film obtained is 1.6, it is the value for being more than 1.

In addition, measuring the peeling force Pa between the film (A) in the multilayer film of Tov and film (B) of the embodiment.By result It is shown in table 1.

The result of Examples and Comparative Examples is collectively shown in table 1.

[table 1]

Table 1

The meaning of abbreviation in table, as described below.

COP: the resin (norbornene polymerization that 126 DEG C of glass transition temperature of the polymer comprising the structure containing ester ring type The resin of object, trade name " ZEONOR ", Zeon Corp's system).

PET: polyester resin (Eastman corporation " PET-G6763 ").

OPP: self adhesion stretched polypropylene films (Futamura Chemical Co., Ltd system, trade name " FSA 010M# 30”)。

It can be defined from the result of table 1, the value of relationship and Pa between Tov and TgA meets the important document of the application Under the conditions of in the embodiments herein that is stretched, the optical film of 0 < Nz < 1 can be easily manufactured.

Description of symbols

100: multilayer film；

111: film (B)；

112: film (B)；

121: adhesive phase；

122: adhesive phase；

131: film (A)；

132: optical film；

151: the pressure roller of stripping area upstream；

152: the pressure roller of stripping area upstream；

161: the pressure roller in stripping area downstream；

162: the pressure roller in stripping area downstream；

200: multilayer film；

231: film (A)；

211: film (B)；

221: adhesive phase；

232: optical film；

P: stripping area.

Claims (5)

1. a kind of manufacturing method of optical film, including providing the stripping process of multilayer film to lift-off processing,

The multilayer film is the film A comprising being made of thermoplastic resin A and one or two tables that the film A is arranged in The multilayer film of the film B in face,

The lift-off processing include in temperature Tov in a manner of applied force on the thickness direction in the film A from the film A by institute State film B removing, the unit of the temperature Tov is DEG C,

The glass transition temperature Tg A of the temperature Tov and film A meets the relationship of Tov >=TgA, the list of the temperature TgA Position for DEG C,

The peeling force Pa of the film A and the film B in the multilayer film, in temperature Tov be 0.03N/50mm or more and 0.5N/50mm or less.

2. the manufacturing method of optical film according to claim 1, wherein

The thermoplastic resin A includes the polymer containing ester ring type structure.

3. the manufacturing method of optical film according to claim 1 or 2, wherein

It further include the stretching process for being just pulled up the multilayer film in its face.

4. a kind of polarizing film, with the polarizer and the optics manufactured by manufacturing method according to any one of claims 1 to 3 Film.

5. a kind of display device has the optical film manufactured by manufacturing method according to any one of claims 1 to 3.