CN108363124A - The manufacturing device of polarizer protective film, the manufacturing method of polarizer protective film and polarizer protective film - Google Patents

Abstract

The present invention provides a kind of polarizer protective film, the manufacturing method of above-mentioned polarizer protective film and the manufacturing device of above-mentioned polarizer protective film; the polarizer with protective film by using base material and antistatic backing be melted in the case where not mixed fixed and substrate layer and antistatic backing together with orientation, form the polarizer protective film of the antistatic backing with specific thickness; the cohesiveness of the interlayer of base material and antistatic backing, adhesion strength are excellent, also electrical with static electricity resistance, anti-release band in the case where not reducing optical characteristics as a result,.The polarizer of the present invention has base material and the antistatic backing formed by the antistatic agent composition containing electric conductive polymer on the single side of above-mentioned base material with protective film; it is characterized in that; above-mentioned base material is melted fixed and has orientation with antistatic backing in the case where not mixed, and the thickness of above-mentioned antistatic backing is 100nm or less.

Description

Polarizer protective film, the manufacturing method of polarizer protective film and polarizer are protected The manufacturing device of cuticula

Technical field

The present invention relates to polarizer protective film, the systems of the manufacturing method of polarizer protective film and polarizer protective film Make device.It, can be individually or with by its layer especially by polarization plates obtained from above-mentioned polarizer protective film are laminated The form of optical film obtained from folded forms liquid crystal display device (LCD), organic electroluminescent (EL) display device, cathode-ray The image display devices such as kinescope (CRT), plasma display panel (PDP), are useful.

Background technology

For liquid crystal display device, organic EL display device etc., according to its image forming mode, for example, in liquid crystal In display device, it is essential to configure polarizer on liquid crystal cell, is usually pasted with polarization plates.

For example, in the manufacture of liquid crystal display panel, for the polarization plates being bonded with liquid crystal cells, exist in order to prevent Damage, spot etc. are generated in processes when processing, transport etc., is glued via the adhesive phase for the surface protection film for constituting polarization plates It is affixed on polarization plate surface.But the surface protection film can no longer need the stage of surface protection film to be stripped removing, but shelling From when generate electrostatic, the liquid crystal of liquid crystal display panel, which generates, to be orientated bad, and albefaction (white is uneven) thus occurs, until unevenness certainly A problem that cannot carrying out panel inspection during until so disappearing, becomes problem.

In order to inhibit the generation of such electrostatic, for example, it is contemplated that using cooperation alkali metal salt as described in Patent Document 1 It waits antistatic agents and assigns the adhesive phase of static electricity resistance as the adhesive phase for constituting surface protection film.

But by the way that cooperation antistatic agent will produce based on adhesive phase within the adhesive layer as described in Patent Document 1 The problems such as bonding force becomes inadequate.

In addition, also having carried out being formed with transparency protected film surface in the polarizer for being laminated in the polarizer for constituting polarization plates anti- Electrostatic layer assigns the trial (for example, patent document 2) of static electricity resistance.

Existing technical literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2009-251281 bulletins

Patent document 2：Japanese Unexamined Patent Application Publication 2016-535321 bulletins

Invention content

Problem to be solved by the invention

But it is gone forward side by side with solution even if being directly coated with antistatic backing (conductive layer) on the surface of polarizer transparent protective film Row heats (drying) and forms antistatic backing, and the cohesiveness, adhesion strength between transparent protective film and antistatic backing are also weak, in operation work It is generated the problems such as interlayer is peeling-off in sequence.

In addition, it is desirable to when thickening the thickness of antistatic backing and assigning static electricity resistance, including the films such as polarization plates of antistatic backing The deteriorations of the optical characteristics such as mist degree, transmissivity become notable or generated when removing surface protection film from polarization plates anti- A problem that destruction of electrostatic layer, becomes problem.

Therefore, it in the present invention, has made intensive studies in view of the foregoing, as a result the purpose of the present invention is to provide one Kind polarizer protective film, the manufacturing method of above-mentioned polarizer protective film and the manufacturing device of above-mentioned polarizer protective film, The protective film for polarizing plate is melted fixed and base material in the case where not mixed by using base material and antistatic backing Layer and antistatic backing together with orientation, form the protective film for polarizing plate of the antistatic backing with specific thickness, by This, the cohesiveness of the interlayer of base material and antistatic backing, adhesion strength are excellent, also quiet with preventing in the case where not reducing optical characteristics Electrically, anti-release band is electrical.

The means used to solve the problem

That is, the present invention polarizer with protective film be have base material and above-mentioned base material single side it is conductive by containing The polarizer protective film for the antistatic backing that the antistatic agent composition of polymer is formed, which is characterized in that above-mentioned base material with it is anti- Electrostatic layer is melted fixed in the case where not mixed and has an orientation, the thickness of above-mentioned antistatic backing be 100nm with Under.

In the polarizer protective film of the present invention, preferably above-mentioned base material is using (methyl) acrylic resin as main component And it is formed.

In the polarizer protective film of the present invention, preferably above-mentioned antistatic agent composition contains poly- (3,4- ethylidene dioxies Thiophene) the above-mentioned electric conductive polymer of/polystyrolsulfon acid (PEDOT/PSS) conduct.

In the polarizer protective film of the present invention, the sheet resistance value of preferably above-mentioned antistatic backing is 1.0 × 10⁸Ω/□ Below.

The manufacturing method of the polarizer protective film of the present invention is the manufacturing method of above-mentioned polarizer protective film, is preferably wrapped Contain：The above-mentioned antistatic agent composition of the one side coating of above-mentioned base material formed film process and by above-mentioned base material with it is above-mentioned The process that film is heated and stretched at the temperature of+20 DEG C of the glass transition temperature Tg of above-mentioned base material or more together.

The manufacturing method of the polarizer protective film of the present invention is preferred：The above-mentioned process for being heated and being stretched is using drawing Width machine formula stretching-machine simultaneously or sequentially carries out biaxial stretch-formed process in width direction and length direction.

The manufacturing method of the polarizer protective film of the present invention is preferred：It is above-mentioned simultaneously or sequentially to carry out biaxial stretch-formed drawing It stretches multiplying power and is respectively 1.5 times or more and 3.0 times or less in width direction and length direction.

The manufacturing device of the polarizer protective film of the present invention is the manufacturing device of above-mentioned polarizer protective film, is preferably wrapped Contain：The film that film is formed in the above-mentioned antistatic agent composition of the one side coating of above-mentioned base material forms unit and by above-mentioned base What material was heated and was stretched at the temperature of+20 DEG C of the glass transition temperature Tg of above-mentioned base material or more together with above-mentioned film Heat draw unit.

In the manufacturing device of the polarizer protective film of the present invention, preferably above-mentioned heating draw unit is drawn using stenter formula Stretch machine.

Invention effect

The polarizer of the present invention is melt by using base material and antistatic backing in the case where not mixed with protective film Melt fixed and substrate layer and antistatic backing together with orientation, be formed with the polarizer of the antistatic backing with specific thicknesses With protective film, thus, it is possible to obtain the excellent cohesiveness of the interlayer of base material and antistatic backing, adhesion strength, static electricity resistance, anti-stripping Charging property also excellent polarizer protective film, is useful.In addition, be capable of providing by carry out at a certain temperature heating and Stretch or stretched with specific stretching ratio and the system of the above-mentioned polarizer protective film that has been improved thickness and precision Method and manufacturing device are made, is useful.In addition, in polarizer (polarization plates) layer that will be laminated with above-mentioned polarizer protective film It is laminated in the state of liquid crystal display device (LCD) etc., the surface protection film directly pasted to protect above-mentioned polarization plates is shelled From when, the generation of electrostatic can be inhibited, the albefaction (white uneven) of the panel of liquid crystal display device etc. can be prevented, and then can also The unfavorable condition of panel inspection is enough prevented, anti-release band is electrically excellent, is preferred mode.

Description of the drawings

Fig. 1 is the schematic sectional for showing to be laminated with a configuration example of the polarizer of the polarizer protective film of the present invention Figure.

Reference numeral

1：Polarizer (polarization plates) with polarizer protective film

2：Polarizer protective film

10：Antistatic backing

11：Base material

12：Polarizer

Specific implementation mode

Hereinafter, the embodiment of the present invention will be described in detail.

<It is laminated with the overall structure of the polarizer of polarizer protective film>

The polarizer (polarizer for carrying polarizer protective film) disclosed herein for being laminated with polarizer protective film, example It can such as enumerate and be laminated with antistatic backing 10 on one side, another in base material 11 of the polarization plates in surface protection film 2 as shown in Figure 1 It is laminated with the polarizer etc. for being laminated with polarizer protective film of the composition of polarizer 12 on one side.In addition, disclosed herein carry The polarizer (polarization plates) of polarizer protective film can be scroll-like or sheet (piece Leaf shapes).

<The base material of polarizer protective film>

The polarizer of the present invention is to have base material and conductive by containing on the single side of above-mentioned base material with protective film The polarizer protective film for the antistatic backing that the antistatic agent composition of polymer is formed, which is characterized in that above-mentioned base material and anti- Electrostatic layer is melted fixed and substrate layer and antistatic backing in the case where not mixed has orientation together.By upper It states base material and antistatic backing melting is fixed and gluing thus, it is possible to ensure the adherency of base material and antistatic backing is preferred securely 's.In addition, there is above-mentioned base material orientation can suitably maintain polarization plates be laminated by controlling its degree of orientation Optical characteristics is preferred mode.It should be noted that for as above-mentioned orientation, such as can be by using strain formula meeting The three-dimensional IR polarimetries of the fourier-transform infrared spectrophotometer of Shimadzu Seisakusho Ltd. of society manufacture confirm orientation.Except length (MD) it distinguishes and is analyzed on the direction orientation (ND) also in face other than direction, the direction width (TD), utilize ND values Judge degree of orientation (dimensionless).ND values are -0.1 or less, preferably -0.1~-0.01, more preferably -0.06~-0.02.It takes It when excessive to degree, implies for example without base material, antistatic backing is formed uniformly in normal plane, therefore, outside polarizer protective film See a problem that generating unevenness or will produce the rupture of polarizer protective film.On the other hand, when degree of orientation is too small, Hint can not be stretched to regulation multiplying power, and therefore, to the characteristic for the polarization plates for being laminated with polarizer protective film, (optics is special sometimes Property, the dimensional stability etc. based on thickness distribution etc.) it affects.

For material as the base material for constituting above-mentioned polarizer protective film, it can be used without particular limitation, preferably The excellent polymer such as the transparency, mechanical strength, thermal stability, moisture barrier, isotropism, ultraviolet-absorbing (tree Fat).Such as it can enumerate：Polyester polymers (the polyesters such as polyethylene terephthalate, polyethylene naphthalate Resin)；The cellulosic polymers such as diacetyl cellulose, triacetyl cellulose；Polymethyl methacrylate etc. (methyl) propylene Acids polymers ((methyl) acrylic resin)；The phenylethylenes such as polystyrene, acrylonitritrile-styrene resin (AS resins) Polymer；Polycarbonate polymer (polycarbonate resin) etc..Alternatively, it is also possible to enumerate：Polyethylene, has polypropylene The polyolefin polymers such as cyclic annular or norbornene structure polyolefin (cyclic olefin resinoid), ethylene-propylene copolymer, The acylamide polymers such as vinyl chloride polymer, nylon or aromatic polyamide, sulfone Type of Collective object, gather acid imide polymer Ether sulfone Type of Collective object, polyether-ether-ketone polymer, polyphenylene sulfide ether polymer, vinyl alcohol polymer, vinylidene chloride are birdsed of the same feather flock together Close object, vinyl butyral Type of Collective object, aryl nitrone polymer, polyformaldehyde Type of Collective object, epoxide polymer or above-mentioned poly- Close the example as the polymer for forming above-mentioned base material such as blend of object, wherein preferably make with (methyl) acrylic resin It is formed for main component.It should be noted that the content that " main component " refers to the above-mentioned polymer in base material is 50 weights The weight of %~100 %, preferably 50 weight of weight %~99 % is measured, 60 weight of weight %~98 % is more preferably, is further excellent It is selected as 70 weight of weight %~97 %.When the content of above-mentioned polymer in base material is 50 weight % or less, it is possible to Bu Nengchong Show the high transparency etc. of polymer inherently with dividing.

In addition, above-mentioned base material is usually bonded with polarizer using gluing oxidant layer and is used as polarization plates.

It should be noted that more than one arbitrary additions appropriate can be contained in the base material of polarizer protective film Agent.For additive, such as it can enumerate：Ultra-violet absorber, lubricant, plasticizer, releasing agent, antioxidant Color inhibitor, fire retardant, nucleating agent, antistatic agent, pigment, colorant etc..

The thickness of the base material of above-mentioned polarizer protective film can be suitably determined, in general, from operations such as intensity, operability Property, the viewpoints such as thin layer consider, preferably 5 μm~50 μm, 5 μm~45 μm further preferred.

Hard conating, antireflective can be set on the face of the non-glued polarizer of the base material of above-mentioned polarizer protective film The functional layers such as layer, adherent layer, anti-film coalescence layer, diffusion layer or antiglare layer.It should be noted that above-mentioned hard conating, antireflection layer, The functional layers such as adherent layer, diffusion layer, antiglare layer other than it can be set to base material itself, can also separately with base material dividually Setting.

It should be noted that when polarizer and base material are laminated, easy gluing can be set between base material and gluing oxidant layer Layer.

<The antistatic backing of polarizer protective film>

The polarizer of the present invention is to have base material and conductive by containing on the single side of above-mentioned base material with protective film The polarizer protective film for the antistatic backing that the antistatic agent composition of polymer is formed, which is characterized in that above-mentioned base material and anti- Electrostatic layer is melted fixed and substrate layer and antistatic backing in the case where (substantial) is not mixed has orientation together Property, the thickness of above-mentioned antistatic backing is 100nm or less.Since above-mentioned antistatic backing is by the antistatic containing electric conductive polymer The antistatic backing that agent composition is formed, can inhibit the raising of sheet resistance value under high temperature, low moisture environments, can obtain To anti-release band, electrical, flexibility, excellent in te pins of durability antistatic backing, is preferred mode.In addition, by being protected in polarizer The surface of cuticula has antistatic backing, without (carrying the polarization of polarizer protective film in polarization plates to (stickup) is directly laminated Device) above-mentioned antistatic backing composition surface protection film adhesive phase assign static electricity resistance, in other words, without coordinating antistatic Ingredient, and workability is excellent, is preferred.It should be noted that " not mixed " refers to not mixing substantially, refer to base The thickness of material and the mixed layer of antistatic backing interface is less than 10nm.

Particularly, be independently matched with above-mentioned polyaniline sulfonic acid or be independently matched with above-mentioned doped with polyanion class (Port リ ア ニ オ Application Class) polythiophene class the case where compare, by coordinate within the above range above-mentioned polyaniline sulfonic acid and it is above-mentioned doped with The stability-enhanced reason of the polythiophene class of polyanion class, the static electricity resistance under hot environment is presumed as follows.About doping Have a polythiophene class of polyanion class, the anionic group coordination of polythiophene class and polyanion class and form complex, lead It has been known that there is the intramolecular of the polythiophene class generated in complex conduction, the intermolecular conductive and complexs of polythiophene class for motor reason Interstructural conduction.Here, conductive because therefore intermolecular distance is certainly fast process farther out between complex structure.Supposition passes through It will include polythiophene class and polyanion class that the polyaniline sulfonic acid that high molecular weight is comparably with polythiophene class, polyaniline sulfonic acid, which is used in combination, Complex between connect, and itself is also conductive, this improves the electric conductivity between complex, static electricity resistance Improve, the stability under hot environment increases, with protective film be useful as polarizer.

In addition, in the case where above-mentioned polyaniline sulfonic acid is used alone as electric conductive polymer, initial electric conductivity is low, Therefore, easy to produce through when stripping charge voltage or sheet resistance value etc. raising.

In addition, in the case where above-mentioned polythiophene class doped with polyanion class is used alone, initial electric conductivity is high, But as time goes by, polyanion class (being equivalent to dopant) is more readily pulled from than polythiophene class, therefore, is easy tod produce Through when stripping charge voltage or sheet resistance value etc. raising, not preferably.

<Electric conductive polymer>

Above-mentioned antistatic backing is preferably by containing polyaniline sulfonic acid and being used as conduction doped with the polythiophene class of polyanion class The antistatic agent composition of property component of polymer is formed.By the combination of above-mentioned electric conductive polymer, and respectively it is independently matched with Situation is compared, and polyaniline sulfonic acid is responsible for the conduction between the nucleocapsid of polythiophene class/polyanion class, therefore electric conductivity improves, Static electricity resistance of the anti-release band based on antistatic backing electrically and under hot environment can be made to stablize, be useful.

Relative to whole components contained in antistatic backing, the content of above-mentioned electric conductive polymer be preferably 1 weight %~ 90 weight %, more preferably 5 weight of weight %~80 %, further preferably 10 weight of weight %~70 %, it is most preferably 20 The weight of weight %~50 %.When the content of above-mentioned electric conductive polymer is very few, anti-static effect reduces sometimes, electric conductive polymer Content it is excessive when, it is possible to antistatic backing declines the adhesiveness of base material or the transparency reduces, therefore not preferably.

For the above-mentioned polyaniline sulfonic acid used as electric conductive polymer ingredient, preferably by gel permeation chromatography (GPC) weight average molecular weight (Mw) of the standard polystyren conversion measured is 5 × 10⁵Below, 3 × 10 are more preferably⁵Below.Separately Outside, the weight average molecular weight of these electric conductive polymers is preferably generally 1 × 10³Above, 5 × 10 are more preferably³More than.

For commercially available product as above-mentioned polyaniline sulfonic acid, the trade name of Rayon companies of Mitsubishi manufacture may be exemplified " aqua-PASS " etc..

For the above-mentioned polythiophene class used as electric conductive polymer ingredient, such as it can enumerate：Polythiophene gathers (3 methyl thiophene), poly- (3- ethylthiophenes), poly- (3- butyl thiophenes), poly- (3- hexyl thiophenes), gather poly- (3- propyl thiophene) (3- heptyl thiophene), poly- (3- octyl thiophenes), poly- (3- decylthiophenes), poly- (3- dodecylthiophenes), poly- (3- octadecyl thiophenes Pheno), poly- (3 bromo thiophene), poly- (3- chlorothiophenes), poly- (3- iodothiophens), poly- (3- cyano thiophenes), poly- (3- tolylthiophenes), poly- (3,4- thioxenes), poly- (3,4- dibutyl thiophene), poly- (3- hydroxy thiophenes), poly- (3- methoxythiophenes), poly- (3- ethoxies Base thiophene), poly- (3- butoxy thiophene), poly- (3- hexyloxies thiophene), poly- (3- oxygroups in heptan thiophene), poly- (3- octyloxies thiophene), Poly- (3- decyloxies thiophene), poly- (3- dodecyloxies thiophene), poly- (3- octadecane epoxides thiophene), poly- (3,4- dihydroxy thiophenes Pheno), poly- (3,4- dimethoxy-thiophenes), poly- (3,4- diethoxies thiophene), poly- (3,4- dipropoxies thiophene), poly- (3,4- bis- Butoxy thiophene), poly- (bis- hexyloxy thiophene of 3,4-), poly- (3,4- oxygroup thiophene in bis- heptan), poly- (bis- octyloxy thiophene of 3,4-), poly- (bis- decyloxy thiophene of 3,4-), poly- [3,4- bis- (dodecyloxy) thiophene], poly- (3,4- ethyldioxythiophenes), poly- (3,4- Popylenedioxythiphene), poly- (3,4- butylidenes dioxy thiophene), poly- (3- methyl -4- methoxythiophenes), poly- (3- methyl -4- second Oxygroup thiophene), poly- (3- carboxy thiophenes), poly- (3- methyl -4- carboxy thiophenes), poly- (3- methyl -4- carboxyethyls thiophene), poly- (3- Methyl -4- carboxylics butyl thiophene).Wherein, preferably poly- (3,4- ethyldioxythiophene) from the viewpoint of electric conductivity.They can It is two or more to be used alone, but also also mix together.Wherein, from the viewpoint of electric conductivity, preferably poly- (3,4- ethylenes Oxygen thiophene) (PEDOT).

For above-mentioned polythiophene class, the degree of polymerization is preferably 2~1000, more preferably 5~100.The degree of polymerization is above-mentioned When in range, excellent electric conductivity, therefore preferably.

Above-mentioned polyanion class is the polymer of the structural unit with anionic group, as the doping in polythiophene class Agent is worked.For above-mentioned polyanion class, such as it can enumerate：Polystyrolsulfon acid, polyvinylsulfonic acid, polyene third Base sulfonic acid, polypropylene acyl group sulfonic acid (Port リ ア Network リ Le ス Le ホ Application acid), polymethacryl sulfonic acid (Port リ メ タ Network リ Le ス Le ホ Application acid), poly- (2- acrylamide-2-methylpro panesulfonic acids), polyisoprene sulfonic acid, polymethylacrylic acid Sulfoethyl esters, Poly- (methacrylic acid 4- sulfo groups butyl ester), poly- methylallyl oxygroup benzene sulfonic acid, polyvinyl carboxylic acid (Port リ ビ ニ Le カ Le ボ Application acid), it is polystyrene carboxylic acid (Port リ ス チ レ Application カ Le ボ Application acid), polyallyl carboxylic acid (Port リ ア リ Le カ Le ボ Application acid), poly- Acryloyl group carboxylic acid (Port リ ア Network リ Le カ Le ボ Application acid), polymethacryl carboxylic acid (Port リ メ タ Network リ Le カ Le ボ Application Acid), poly- (2- acrylamido -2- methylpropanes carboxylic acid) (Port リ (2- ア Network リ Le ア ミ De -2- メ チ Le プ ロ パ Application カ Le ボ Application acid)), polyisoprene carboxylic acid (Port リ イ ソ プ レ Application カ Le ボ Application acid), polyacrylic acid, polysulfonate phenylacetylene etc..It can Can also be two or more copolymer to be their homopolymer.Wherein, preferred polystyrolsulfon acid (PSS).

The weight average molecular weight (Mw) of above-mentioned polyanion class is preferably 1000~1,000,000, more preferably 2000~500,000.Mw When within the above range, the doping and dispersibility in polythiophene class are excellent, therefore preferably.

For commercially available product as the above-mentioned polythiophene class doped with polyanion class, for example, may be exemplified：As poly- The trade name " Bytron P " of Beyer Co., Ltd's manufacture of (3,4- ethyldioxythiophenes)/polystyrolsulfon acid (PEDOT/PSS), The trade name " Seplegyda " of polymer companies of SHIN-ETSU HANTOTAI manufacture, the trade name " VERAZOL " of Soken Chemical Company manufacture, length are rapids The trade name " Denatron P-502RG " etc. of chemical conversion company manufacture.Wherein, PEDOT/PSS is being used in composition polarizer guarantor In the case of in the antistatic backing of cuticula, even if after heating stretching process, PEDOT/PSS is also electric conductive polymer, Therefore, flexibility, excellent in te pins of durability can be obtained, maintain the electrical antistatic backing of static electricity resistance, anti-release band, be preferred Mode.It should be noted that will on base material film obtained from antistatic ingredient of the coating as nonconductive polymers and When base material carries out heating stretching together, the problem that cracking, crackle etc. are introduced in film (antistatic backing), Bu Nengshi also will produce With change, therefore not preferably.

In above-mentioned antistatic agent composition, preferably above-mentioned polyaniline sulfonic acid and the above-mentioned polythiophene doped with polyanion class Mixing ratio (weight ratio) (the above-mentioned polyaniline sulfonic acid of class:The above-mentioned polythiophene class doped with polyanion class) it is 90:10~ 10:90,85 are more preferably:15~15:85, it is more preferably 80:20~20:80.Mixing ratio within the above range when, energy Enough sheet resistance value is inhibited relatively low, especially the excellent in stability of the sheet resistance value under hot environment, for preferred side Formula.It should be noted that when above-mentioned polyaniline sulfonic acid content is few or the above-mentioned polythiophene class doped with polyanion class contains When amount is few, the sheet resistance value under hot environment is easy to increase, therefore not preferably.

<Binder>

Above-mentioned antistatic backing can include Binder Composition, can be used without particular limitation, in order to assign solvent resistance, Mechanical strength, charged characteristic and thermal stability, preferably by containing antistatic agent composition shape of the polyester resin as binder At antistatic backing.Above-mentioned polyester resin preferably contains polyester and (is typically accounted for more than 50 weight %, excellent as main component Select the ingredient of 75 weight % or more, such as 90 weight % or more) resin material.Above-mentioned polyester, which typically preferably has, is selected from one There is the polybasic carboxylic acid class (typically dicarboxylic acids class) and its derivative (polybasic carboxylic acid of more than two carboxyls in a molecule Acid anhydrides, carboxylate, halide etc.) one or more of compound (polybasic carboxylic acid ingredient) in a molecule One or more of polyalcohols (typically glycols) with more than two hydroxyls compound (polyalcohol at Point) condensation obtained from structure.

For it may be used as the example of compound of above-mentioned polybasic carboxylic acid ingredient, it can enumerate：Oxalic acid, malonic acid, Difluoro malonic acid, alkyl malonic acid, succinic acid, tetrafluoro succinic acid, alkyl succinic acid, (±)-malic acid, mesotartaric acid, Itaconic acid, maleic acid, citraconic acid, fumaric acid, mesaconic acid, acetylene dioctyl phthalate, glutaric acid, hexafluoro glutaric acid, methyl Glutaric acid, glutaconate, adipic acid, two thio adipic acids, methyl adipic acid, dimethyl adipic acid, tetramethyl adipic acid, methylene Base adipic acid, muconic acid, galactosaccharic acid, pimelic acid, suberic acid, perfluor suberic acid, 3,3,6,6- tetramethyls suberic acid, nonyl two Acid, decanedioic acid, perfluor decanedioic acid, brassylic acid, dimethyl acid, tridecyl dioctyl phthalate, dodecyldimethylamine acid etc. Aliphatic dicarboxylic acid class；Naphthenic base dioctyl phthalate (for example, Isosorbide-5-Nitrae-cyclohexane cyclohexanedimethanodibasic, 1,2- cyclohexane cyclohexanedimethanodibasics), Isosorbide-5-Nitrae-(2- Norbornene) fat such as dioctyl phthalate, 5- norbornene -2,3- dioctyl phthalate (nadic acid), adamantane acid, spiroheptane dioctyl phthalate Ring type dicarboxylic acids class；Between phthalic acid, M-phthalic acid, two sulfoisophthalic acids, methylresorcinol dioctyl phthalate, dimethyl Phthalic acid, chloro M-phthalic acid, dichloro- M-phthalic acid, terephthalic acid (TPA), methylterephthalic acid, dimethyl are to benzene Dioctyl phthalate, chloro terephthalic acid (TPA), bromoterephthalic acid, naphthalenedicarboxylic acid, oxo fluorenes dioctyl phthalate, anthracene dioctyl phthalate, biphenyl diformazan Acid, biphenyl alkene dioctyl phthalate (ビ Off ェ ニ レ Application ジ カ Le ボ Application acid), dimethyl diphenyl alkene dioctyl phthalate (ジ メ チ Le ビ Off ェ ニ レ Application ジ カ Le ボ Application acid), 4,4 "-para-terpheny support dioctyl phthalate, 4,4 "-to tetrad phthalic acid, dibenzyl dioctyl phthalate, azo Phthalic acid, homophthalic acid, penylene oxalic acid, penylene dipropionic acid, naphthalenedicarboxylic acid, naphthalene dipropionic acid, biphenyl oxalic acid, biphenyl two Propionic acid, 3,3'- [4,4 '-(methylene two is to biphenylene) dipropionic acids, 4,4 '-dibenzyl oxalic acid, 3,3 '-(4,4 '-dibenzyls) Dipropionic acid, oxygroup two are to the aromatic binary carboxylic acids class such as penylene oxalic acid；The acid anhydrides of above-mentioned any polybasic carboxylic acid；Above-mentioned Ester (such as the Arrcostab of any polybasic carboxylic acid.Can be monoesters, diester etc.)；It is corresponding with above-mentioned any polybasic carboxylic acid Etheride (such as dimethyl chloride)；Deng.

For preference as the compound that may be used as above-mentioned polybasic carboxylic acid ingredient, it can enumerate：Terephthalic acid (TPA), The aromatic binary carboxylic acids such as M-phthalic acid, naphthalenedicarboxylic acid class and its acid anhydrides；Adipic acid, decanedioic acid, azelaic acid, succinic acid, richness Aliphatic dicarboxylic acids class and its acid anhydrides such as horse acid, maleic acid, nadic acid, 1,4 cyclohexanedicarboxylic acid；And above-mentioned binary Lower alkyl esters (for example, ester with the monohydric alcohol formation of carbon atom number 1~3) of carboxylic acids etc..

On the other hand, it for as the example for the compound that may be used as above-mentioned polyol component, can enumerate：Second two Alcohol, propylene glycol, 1,2- propylene glycol, 1,3- propylene glycol, 1,3 butylene glycol, 1,4- butanediols, neopentyl glycol, 1,5- pentanediols, 1, 6- hexylene glycols, 3- methyl pentanediols, diethylene glycol, 1,4 cyclohexane dimethanol, 3- methyl-1s, 5- pentanediols, 2- methyl-1s, 3- Propylene glycol, 2,2- diethyl -1,3- propylene glycol, 2-butyl-2-ethyl-1,3-propanediol, benzene dimethanol, hydrogenated bisphenol A, bis-phenol The glycols such as A.As other examples, can enumerate these compounds alkylene oxide addition product (for example, ethylene oxide adduct, Propylene oxide adduct etc.).

The molecular weight of above-mentioned polyester resin is with the number of the standard polystyren conversion measured using gel permeation chromatography (GPC) Average molecular weight (Mn) meter for example can be about 5 × 10³~about 1.5 × 10⁵(it is preferably from about 1 × 10⁴~about 6 × 10⁴).On in addition, The glass transition temperature (Tg) for stating polyester resin for example can be 0 DEG C~120 DEG C (preferably 10 DEG C~80 DEG C).

For commercially available product as above-mentioned polyester resin, such as it can enumerate：The trade name of company's manufacture is spun by Japan VYLONAL MD-1100、MD-1200、MD-1245、MD-1335、MD-1480、MD-1500、MD-1930、MD-1985、MD- 2000, trade name Plascoat Z-221, Z-446, Z-561, Z-565, Z-880, Z- of mutual induction chemical industrial company manufacture 3310, the PESRESIN that RZ-105, RZ-570, Z-730, Z-760, Z-592, Z-687, Z-690, high terebinth company manufacture A-110、A-120、A-124GP、A-125S、A-160P、A-520、A-613D、A-615GE、A-640、A-645GH、A- 647GEX, A-680, A-684G, WAC-14, WAC-17XC etc..

About above-mentioned antistatic backing, in the performance for not damaging protective film disclosed herein significantly (for example, the property such as static electricity resistance Can) limit in, can also be applied in combination in addition to polyester resin resin (for example, selected from acrylic resin, acrylic acid Class-polyurethane resin, acrylic-styrene resin, acrylic-silicone resin, polyorganosiloxane resin, polysilazane One kind in resin, fluororesin, styrene resin, alkyd resin, polyurethane resin, amide resin, vistanex etc. or two Kind or more resin) be used as binder.In the case where above-mentioned resin is applied in combination, preferred polyester resin is shared in a binder Ratio is the antistatic backing of 51 weight of weight %~100 %.Binder ratio shared in antistatic backing entirety for example can be with It is set as the 50 weight % of weight %~95, it is appropriate to be typically set at 60 weight of weight %~90 %.

<Lubricant>

Used antistatic agent composition, preferred embodiment when about formation antistatic backing in technology disclosed herein For：Using selected from by fatty acid amide, aliphatic ester, silicone based lubricant, fluorine-containing type lubricant and wax class lubricant structure At at least one of group be used as lubricant.By using above-mentioned lubricant, even if not implementing to the surface of antistatic backing Further lift-off processing is (for example, be coated with stripping treatment agent well known to polysiloxane-based remover, chain alkyl class remover etc. And the processing being dried) mode in can also have been taken into account sufficient lubricity and print adhesiveness antistatic backing, Therefore it can become preferred mode.About the side for not implementing further lift-off processing to the surface of antistatic backing as such Formula, can prevent in advance the albefaction caused by stripping treatment agent (for example, being led due to being preserved under the conditions of warming and humidifying The albefaction of cause) etc. from the point of view of be preferred.In addition, being also advantageous from the viewpoint of solvent resistance.

For concrete example as above-mentioned fatty acid amide, it can enumerate：Lauric amide, palmitamide, stearic acid Amide, behenamides, hydroxy stearic acid amide, oleamide, erucyl amide, N- oleyl palmitamides, N- stearyls Stearic amide, N- stearyls oleamide, N- oleyl stearamides, N- stearyl erucamides, hydroxymethylstearic acid Amide, di-2-ethylhexylphosphine oxide stearic amide, ethylenebis capric acid acidamide, ethylenebis lauric amide, ethylenebis stearic acid acyl Amine, ethylenebis hydroxy stearic acid amide, ethylidene Shuan behenamides, hexamethylene bis stearic amide, hexamethylene bis Behenamide, hexa-methylene hydroxy stearic acid amide, N, N '-distearyl adipic acids amide, N, N '-distearyl decanedioic acid Amide, ethylenebisoleaamide, ethylenebis erucyl amide, hexamethylene bis oleamide, N ,-two oleyl adipic acids of N ' Amide, N, the double stearic amides of-two oleyl decanedioic acid amides of N ', m-phenylenedimethylim-, the double hydroxy stearates of m-phenylenedimethylim- Sour amide, N, N '-stearyl M-phthalic acid amides etc..These lubricants can be used alone, and can also be applied in combination It is two or more.

For concrete example as above-mentioned aliphatic ester, it can enumerate：Polyethylene glycol oxide bisphenol-A laurate, stearic acid Butyl ester, palmitic acid 2- ethylhexyls, stearic acid 2- ethylhexyls, Glyceryl monobehenate, 2 ethyl hexanoic acid cetyl ester, meat Isopropyl myristate, isopropyl palmitate, isostearic acid cholesterol ester, lauryl methacrylate, fatty acid distribution of coconut oil methyl esters, the moon Acid methylester, methyl oleate, methyl stearate, myristyl myristate, myristic acid octyldodecyl, pentaerythrite Monoleate, pentaerythritol monostearate, four palmitate of pentaerythrite, stearyl stearate, stearic acid isotridecyl Ester, three -2 ethyl hexanoic acid of glycerine ester, butyl laurate, oleic acid monooctyl ester etc..These lubricants can be used alone, and also may be used It is two or more to be applied in combination.

For concrete example as above-mentioned silicone based lubricant, it can enumerate：It is dimethyl silicone polymer, polyether-modified Dimethyl silicone polymer, amino modified dimethyl silicone polymer, epoxy-modified dimethyl silicone polymer, carbinol-modified poly dimethyl Siloxanes, sulfhydryl modified dimethyl silicone polymer, carboxy-modified dimethyl silicone polymer, methylhydrogenpolysi,oxane, metering system Sour modified dimethyl polysiloxane, phenol-modified dimethyl silicone polymer, silanol-modified dimethyl silicone polymer, aralkyl change Property dimethyl silicone polymer, fluoro-alkyl modified dimethyl polysiloxane, long chain alkyl modified dimethyl silicone polymer, advanced fat Fat acid is modified ester modified dimethyl silicone polymer, higher fatty acid amides modified dimethyl polysiloxane, phenyl modified poly- diformazan Radical siloxane etc..These lubricants can be used alone, and can also be applied in combination two or more.

As the concrete example of above-mentioned fluorine-containing type lubricant, can enumerate：Perfluoro alkane, perfluorocarboxylic acid ester, fluorine-containing block are total Polymers, the polyether polymer etc. with fluoro-alkyl.These lubricants can be used alone, and can also be applied in combination two kinds More than.

For concrete example as above-mentioned wax class lubricant, it can enumerate：Petroleum-type wax (solid paraffin etc.), plant wax (Brazil wax etc.), mineral substance wax (lignite wax etc.), higher fatty acids (cerinic acid etc.), neutral fat (tripalmitin Deng) etc. various waxes.These lubricants can be used alone, and can also be applied in combination two or more.

Lubricant ratio shared in above-mentioned antistatic backing entirety can be set as the 1 weight % of weight %~50, usually It is appropriate to be set as 5 weight of weight %~40 %.When the content ratio of lubricant is very few, incline with what lubricity was easily reduced To.When the content ratio of lubricant is excessive, printing adhesiveness, back side peeling force (bonding force) are likely to decrease.

The antistatic agent composition for being used to form above-mentioned antistatic backing is preferably comprised selected from by silane coupling agent, epoxies friendship Join at least one of group that agent, melamine class crosslinking agent and isocyanates crosslinking agent are constituted and be used as crosslinking agent, wherein is special Be not using above-mentioned melamine class crosslinking agent and/or isocyanates crosslinking agent it is preferred mode.Form antistatic backing When that electric conductive polymer ingredient (for example, polyaniline sulfonic acid, doped with the polythiophene class of polyanion class) can be made to be fixed on is viscous It ties in agent, water resistance, excellent solvent resistance and then can realize raising printing adhesiveness and other effects.Particularly, by using three Paracyanogen amine cross-linking agent, water resistance, solvent resistance improve, and make water resistance, printing viscous by using isocyanates crosslinking agent Attached property improves, and by and with these crosslinking agents, water resistance, solvent resistance, printing adhesiveness improve, and are useful.

As above-mentioned melamine class crosslinking agent, melamine, alkylated melamine, methylol melamine can be used Amine, alkoxylated methyl melamine etc..

In addition, as above-mentioned isocyanates crosslinking agent, preferably using the sealing end also stablized in aqueous solution Change isocyanates crosslinking agent.For concrete example as above-mentioned sealing end isocyanates crosslinking agent, it can use and utilize alcohol Class, phenols, benzenethiol class, amine, acid imide, oximes, lactams, activity methene compound class, thio-alcohol, imines Class, ureas, biaryl compound class and sodium hydrogensulfite etc. will can use when preparing common adhesive phase, antistatic backing Object obtained from isocyanates crosslinking agent (for example, the isocyanate compound used in aftermentioned adhesive phase) is blocked Matter.

Antistatic backing in technology disclosed herein can contain antistatic agent, antioxidant, colorant (face as needed Material, dyestuff etc.), fluidity regulator (thixotropic agent, thickener etc.), coalescents, surfactant (antifoaming agent etc.), preservative Equal additives.Furthermore it is also possible to contain glycidyl compound, polar solvent, polyhydric aliphatic race alcohol, lactam compound etc. As electric conductivity enhancer.

Above-mentioned antistatic backing can be by including making to be made according to above-mentioned electric conductive polymer ingredient etc. in application on base material Fluid composition (antistatic agent composition) obtained from additive is dissolved or dispersed in solvent appropriate (water etc.) Method is properly formed.It in the present invention, can preferably with the following method：Above-mentioned antistatic agent composition is coated on base The single side of material is heated (drying) and is stretched together with above-mentioned base material, and carries out curing process as needed (at heat Reason, UV treatment etc.).The NV (involatile constituent) of above-mentioned antistatic agent composition material is for example, it can be set to be 5 weights % or less (the typically 0.05 weight % of weight %~5) is measured, 1 weight % or less (typically 0.10 weights are typically set at Measure the weight % of %~1) it is appropriate.In the case of formation thickness smaller antistatic backing, preferably by above-mentioned antistatic agent group The NV for closing object is set as such as 0.05 weight of weight %~0.50 % (such as 0.10 weight % of weight %~0.40).By using The antistatic agent composition of such low NV, can form antistatic backing evenly.

For the solvent for constituting above-mentioned antistatic agent composition, it is preferably able to make the forming component of antistatic backing to stablize Ground dissolves or the solvent of dispersion.The solvent can be organic solvent, water or their mixed solvent.As above-mentioned organic For solvent, it can be used for example selected from esters such as ethyl acetate；The ketones such as methyl ethyl ketone, acetone, cyclohexanone；Tetrahydrofuran (THF), twoThe ring-type ethers such as alkane；The aliphatic such as n-hexane, hexamethylene or alicyclic hydro carbons；The aromatic series such as toluene, dimethylbenzene Hydro carbons；The aliphatic such as methanol, ethyl alcohol, normal propyl alcohol, isopropanol, cyclohexanol or alicyclic alcohols；Alkylene glycol monoalkyl ethers (example Such as, glycol monoethyl ether, ethylene glycol monoethyl ether), one or both of glycol ethers such as two alkylene glycol monoalkyl ethers etc. More than.In a preferred mode, the solvent of above-mentioned antistatic agent composition is water or is made with water as main component mixed Bonding solvent (for example, mixed solvent of water and ethyl alcohol).

In addition, in order to improve dispersion stabilization in a solvent, can contain can in the form of ion pair with it is poly- it is cloudy from The anionic group of subclass is coordinated or the alkaline organic compound of bonding.For alkaline organic compound, it can enumerate：It is public Hydrochloride, cationic emulsifier, basic resin of the amine compounds, amine compounds known etc..

As above-mentioned alkaline organic compound, specifically, can enumerate：Methyl octylame, methylbenzylamine, N- methylbenzenes Amine, dimethylamine, diethylamine, diethanol amine, N- methylethanolamines, di-n-propylamine, diisopropylamine, methyl-isopropanol amine, two fourths Amine, two -2 ethyl hexylamines, amino ethyl ethanolamine, 3- amino -1- propyl alcohol, isopropylamine, mono aminoethane, 2 ethyl hexylamine, tertiary fourth Amine, N- (2- amino-ethyls) -3- aminopropylmethyldimethoxysilanes, N- (2- amino-ethyls) -3- aminopropyl trimethoxies Base silane, N- (2- amino-ethyls) -3-aminopropyltriethoxysilane, 3- TSL 8330s, 3- aminopropans Amine compounds, monomethylamine, mono aminoethane, the stearylamines such as ethyl triethoxy silicane alkane, N- phenyl -3- TSL 8330s etc. Hydrochloride, trimethylamine, triethylamine, the stearyl dimethyl of the secondary amine such as hydrochloride, dimethylamine, diethylamine, the distearyl amine of primary amine The hydrochloride of the tertiary amines such as amine, stearyl trimethyl ammonium chloride, VARISOFT TA100, stearyldimethylbenzylammonium chlorination Hydrochloride, ethylenediamine, diethylenetriamines of the ethanolamines such as the quaternary ammonium salts such as ammonium, monoethanolamine, diethanol amine, triethanolamine etc. The hydrochloride etc. of polyethylene polyamine class.

For above-mentioned cationic emulsifier, specifically, can enumerate：Alkylammonium salt, alkyl amido betaine, Alkyl dimethyl amine oxide etc..

For concrete example as above-mentioned basic resin, it can enumerate：Including polyesters, acrylic compounds, polyurethanes etc. High-molecular copolymer, weight average molecular weight (Mw) be 1000~1,000,000 basic resin.The weight average molecular weight of basic resin is less than When 1000, it is unable to get sufficient steric hindrance, dispersion effect reduces sometimes, when weight average molecular weight is more than 1,000,000, sometimes instead It will produce cohesion.

In addition, the amine value of above-mentioned basic resin is preferably 5mgKOH/g~200mgKOH/g.When less than 5mgKOH/g, and mix The interaction of the miscellaneous polyanion class in polythiophene class is easy to become inadequate, cannot obtain adequately disperseing effect sometimes Fruit.On the other hand, when the amine value of basic resin is more than 200mgKOH/g, with the polyanion class parent to being entrained in polythiophene class With part compare, space bit resistance layer reduce, dispersion effect is insufficient sometimes.

For above-mentioned basic resin, such as it can enumerate：Solsperse 17000、Solsperse 20000、 Solsperse 24000, Solsperse 32000 (manufacture of Zeneca Co., Ltd.), Disperbyk-160, Disperbyk- 161、Disperbyk-162、Disperbyk-163、Disperbyk-170、Disperbyk-2000、Disperbyk-2001 (manufacture of Bi Ke chemical companies), AJISPER PB711, AJISPER PB821, AJISPER PB822, AJISPER PB824 (tastes Element Co., Ltd. manufacture), EPOMIN 006, EPOMIN 012, EPOMIN 018 (Nippon Shokubai Co., Ltd's manufacture), EFKA 4046, EFKA 4300, EFKA 4330, EFKA 4510 (manufacture of EFKA companies), DISPARLON DA-400N (nanmu this chemical conversionization Company manufactures) etc., it can be used alone or be used in combination.Particularly, excellent from the aspect of electric conductivity when dispersibility, use Select AJISPER PB821, AJISPER PB822, AJISPER PB824.

There is no limit total 100 weight relative to polythiophene class and polyanion class for the content of above-mentioned alkali compounds Part, can preferably in the parts by weight of 1 parts by weight~100,000, more preferably in 10 parts by weight~10,000 parts by weight in the range of add.

Antistatic backing in the present invention is characterized by having orientation.Above-mentioned antistatic backing has orientation, passes through control Its degree of orientation is made, the optical characteristics of polarization plates be laminated can be suitably maintained, is preferred mode.It needs to illustrate It is that for above-mentioned orientation, confirmation can be carried out similarly with the orientation of above-mentioned base material.

The thickness of above-mentioned antistatic backing (after heating stretches) is 100nm or less, preferably 3nm~100nm, is more preferably 20nm~80nm.When the thickness of antistatic backing is too small, it is difficult to be formed uniformly antistatic backing (for example, for the thickness of antistatic backing For degree, increased according to the deviation (バ ラ Star キ) of the thickness of position), therefore, it is possible to be easy in polarizer protective film It generates in appearance uneven.On the other hand, when antistatic backing is blocked up, the spy to the polarization plates for being laminated with polarizer protective film sometimes Property (optical characteristics, the dimensional stability etc. based on thickness distribution etc.) affects.In addition, polarizer is laminated with protective film Obtained from polarization plates surface mount surface protection film and in the case of being protected, removed by the surface protection film stripping When, if antistatic backing is blocked up, then destruction is generated between base material and antistatic backing, not preferably.

The sheet resistance value (Ω/) measured at the surface of above-mentioned antistatic backing is preferably 1.0 × 10⁸Below, more excellent It is selected as 1.0 × 10⁴~1.0 × 10⁸, further preferably 1.0 × 10⁶~1.0 × 10⁷.Show above range inner surface resistance The polarizer of value can inhibit protective film caused by being charged by friction by what is generated in manufacturing procedure, transport process with protective film Electrification, can prevent attract dust or prevent workability reduce it is preferable to use.It should be noted that above-mentioned surface electricity Resistance value can be electric by the surface measured under 23 DEG C of temperature, the atmosphere of humidity 50%RH using commercially available determination of insulation resistance device Computing the resistor value.

<The manufacturing method of polarizer protective film>

The manufacturing method of the polarizer protective film of the present invention preferably comprises：It is above-mentioned anti-quiet in the one side coating of above-mentioned base material Electric agent composition and formed the process of film and by above-mentioned base material together with above-mentioned film in the glass transition temperature of above-mentioned base material The process for being heated and being stretched at the temperature of Tg+20 DEG C of degree or more.By at the temperature than 20 DEG C of the Tg high of base material or more It heating and is stretched, base material melts fixation with film (antistatic backing) in the case where (substantial) is not mixed as a result, It is able to confirm that the interface of base material and antistatic backing, the adhesion strength between base material and antistatic backing improves, and is preferred mode.In addition, By being stretched, base material together with antistatic backing there is orientation can suitably maintain institute by controlling its degree of orientation The optical characteristics of the polarization plates of stacking is preferred mode.It should be noted that in the present invention, by base material and film It is heated and is stretched, obtained base material and antistatic backing are melted fixation, still, usually not solid using such melting Determine but is formed on base material by solvent penetration (for example, the method for the solvent that addition dimethyl ketone etc. can be such that base material melts) Antistatic backing, also it can be anticipated that the raising of interlayer adhesion force.On the other hand, the permeable formation formed by solvent penetration is (for infiltration The interface of base material and antistatic backing is not present, sometimes with tens nm grades of base material, antistatic backing and solvent composition formed above in part The mixed layer (permeable formation) being obtained by mixing) there is cohesiveness to decline the tendency (as fragile layer), the thickness of permeable formation is easy It is changed, therefore, is difficult to control in practicality, therefore not preferably according to working condition.In addition, stretching work as above-mentioned heating For the temperature of sequence, more preferably than 30 DEG C of Tg high of base material or more, further preferably than 40 DEG C of the Tg high or more of base material.It is logical It crosses at temperature more higher than the Tg of base material and is heated and stretched, base material and antistatic backing melting are fixed and securely as a result, Gluing can be formed while ensuring the adherency of base material and antistatic backing, therefore preferably.

In the manufacturing method of the polarizer protective film of the present invention, the preferably above-mentioned process for being heated and being stretched is to use Stenter formula stretching-machine simultaneously or sequentially carried out in width direction and length direction it is biaxial stretch-formed (simultaneously biaxial drawing or Successively biaxial drawing) process.By carrying out simultaneously biaxial drawing or successively biaxial drawing, can equably adjust base material and By the thickness distribution for the antistatic backing that film is formed, the small polarizer protection of adhesiveness, the deviation of static electricity resistance can be obtained Film is preferred mode.It should be noted that for as the method for carrying out simultaneously biaxial drawing or successively biaxial drawing, It is not particularly limited, as long as simultaneously biaxial drawing or successively biaxial drawing can be carried out in width direction and length direction Method.

In addition, in the manufacturing method of the polarizer protective film of the present invention, it is preferably above-mentioned simultaneously or sequentially to carry out twin shaft The stretching ratio of stretching is 1.5 times or more and 3.0 times or less (on length directions (MD) and width direction (TD) both direction). Within the above range by stretching ratio, the thickness distribution of the width direction of polarizer protective film is narrow, point of thickness and precision Cloth improves, and is not likely to produce the phase difference based on base material, and optical characteristics is excellent, is preferred mode.On the other hand, stretching ratio carries Gao Shi, it is possible to which film itself becomes easy cracking or becomes fragile, and the distribution of thickness and precision also declines, when being wound to film, outside The property seen is poor, generates the phase difference based on base material, therefore not preferably.In addition, for as stretching ratio, more preferably 1.5 times with It is upper and 2.5 times or less, further preferably 1.5 times or more and 2.3 times or less, be particularly preferably 1.5 times or more and 2.1 times with Under.

<The manufacturing device of polarizer protective film>

The manufacturing device of the polarizer protective film of the present invention preferably comprises：It is above-mentioned anti-quiet in the one side coating of above-mentioned base material Electric agent composition and formed film film formed unit and by above-mentioned base material together with above-mentioned film in the glass of above-mentioned base material Change the heating draw unit for being heated and being stretched at the temperature of Tg+20 DEG C of transition temperature or more.In addition, being drawn as above-mentioned heating It stretches for unit, it is preferable to use stenter formula stretching-machine.The manufacturing device of above-mentioned polarizer protective film is by including above-mentioned painting Film forms unit and above-mentioned heating draw unit, and base material is not mixed with film (antistatic backing) (substantial) as a result, In the case of melt fix, be able to confirm that the interface of base material and antistatic backing, can obtain between obtained base material and antistatic backing The excellent polarizer protective film of adhesion strength, be preferred mode.In addition, above-mentioned by being used as comprising stenter formula stretching-machine Draw unit is heated, the thickness distribution of the width direction of polarizer protective film is narrow, and the distribution of thickness and precision improves, and is not likely to produce Phase difference based on base material, optical characteristics is excellent, is preferred mode.Furthermore it is possible to continuously carry out film formation (coating) And stretching is preferred it is thus possible to enough reduce work hours.

<Polarizer>

For constituting polarization plates and the polarizer of polarizer protective film of the present invention will be laminated, using being utilized The polarizer of polyvinyl alcohol resin.For polarizer, such as it can enumerate：Make the dichroism object such as iodine, dichroic dye Matter is adsorbed in polyvinyl alcohol film, part formylated polyvinyl alcohol film, the partly-hydrolysed film of vinyl-vinyl acetate copolymer class The dechlorination of film, polyvinyl alcohol dehydration product, polyvinyl chloride obtained from waiting hydrophilic polymer films and being uniaxially stretched Change polyenoid based oriented films such as hydrogen processing product etc..Wherein, the polarization of the dichroic substances such as polyvinyl alcohol film and iodine is preferably comprised Device.

Above-mentioned polyvinyl alcohol film is dyed using iodine and polarizer obtained from being uniaxially stretched for example can be with It makes in the following manner：By being dyed and being stretched to the 3 of raw footage in the aqueous solution of iodine by polyvinyl alcohol dipping ~7 times.Boric acid, zinc sulfate, zinc chloride etc. can be contained as needed, the aqueous solution of potassium iodide etc. can also be impregnated in.In addition, Polyvinyl alcohol film immersion can be washed in water before dyeing as needed.By carrying out water to polyvinyl alcohol film It washes, other than it can clean the spot of polyvinyl alcohol film surface, anti-blocking agent, also has by keeping polyvinyl alcohol film molten It is swollen and prevent from dyeing unequal non-uniform effect.Stretching can be carried out after being dyed using iodine, can also contaminated It is stretched while color, furthermore it is also possible to be dyed using iodine after being stretched.It can be in boric acid, potassium iodide etc. It is stretched in aqueous solution or water-bath.

From the viewpoint of slimming, the thickness of above-mentioned polarizer is preferably 20 μm or less, more preferably 10 μm or less, into One step is preferably 5 μm or less.On the other hand, the thickness of polarizer is preferably 1 μm or more.The thickness of such slim polarizer is not Small, visibility is excellent, and change in size is small, therefore, to the excellent in te pins of durability of thermal shock.As slim polarizer Speech, can typically enumerate：In No. 4751486 specifications of Japanese Patent No., Japanese Patent No. No. 4751481 specifications, days No. 2014/077599 No. 4815544 specification of this patent, No. 5048120 specifications of Japanese Patent No., International Publication No. uniline Slim polarizer described in No. 2014/077636 sheet, International Publication No. separate edition etc. or the manufacturer recorded by above-mentioned document The slim polarizer that method obtains.

Above-mentioned polarizer is preferably so that by single plate transmission (Unit Ti transmittances) optical characteristics that indicates of T and degree of polarization P Meet following formula P>(100.929T-42.4-1) × 100 (wherein, T<Or the condition of P >=99.9 (wherein, T >=42.3) 42.3) Mode constitute.The polarizer constituted in a manner of meeting above-mentioned condition uniquely has as having used large-scale display element Performance required by the display of liquid crystal display television.Specifically, contrast is 1000:1 or more and maximum brightness be 500cd/ m²More than.For other purposes, such as fit in the visuognosis side of organic EL units.

For above-mentioned slim polarizer, even if from the process and progress stretched with the state of laminated body is being included It is preferably logical from the viewpoint of capable of also being stretched with high magnification in the manufacturing method of the process of dyeing and polarization property capable of being improved Cross such as No. 4815544 No. 4751486 specifications of Japanese Patent No., No. 4751481 specifications of Japanese Patent No., Japan Patent explanations It is included in polarizer obtained from the manufacturing method of the process stretched in boric acid aqueous solution recorded in book, particularly preferably By being included in boric acid aqueous solution described in No. 4815544 No. 4751481 specifications of Japanese Patent No., Japan Patent specifications It is middle stretched before secondarily carry out polarizer obtained from the manufacturing method of process stretched in air.These are slim partially Shake device can by comprising by polyvinyl alcohol resin (hereinafter also referred to PVA resinoids) layer and stretching resin base material to be laminated The manufacturing method of process and the process dyed that the state of body is stretched obtains.If it is the manufacturing method, even if then PVA resinoid layers are relatively thin, can also by by stretch supported with resin base material by not caused by stretching fracture etc. it is bad It is stretched in the case of situation.

<Polarization plates>

The polarization plates that polarizer etc. by being laminated with the polarizer protective film of the present invention is constituted can be used in polarizer At least one side have antistatic backing polarizer protective film polarization plates.Further, it is possible to use in above-mentioned polarization plates At least one side be laminated with adhesive phase composition polarization plates, can contacting with above-mentioned polarization plates in above-mentioned adhesive phase Other optical components (for example, phase difference film, liquid crystal display device etc.) etc. are laminated on the face of the opposite side in face.It needs to illustrate It is that can also use positioned at the above-mentioned antistatic backing on the surface layer of above-mentioned polarization plates and gluing for the surface protection film of composition polarization plates The polarization plates of the composition of (contact) are directly laminated in mixture layer.

The thickness of above-mentioned polarization plates is preferably 100 μm or less, more preferably 75 μm or less, be more preferably 50 μm with Under.Thickness by above-mentioned polarization plates is 100 μm hereinafter, the requirement of slimming is coped with, in design, portability, light weight It is useful in terms of change.

<First adhesive phase>

At least one side in above-mentioned polarization plates can be used to be laminated with the polarization plates of the composition of first adhesive phase, Ke Yi The face of the opposite side in the face of first adhesive phase contacted with above-mentioned polarization plates be laminated other optical components (for example, phase difference film, Liquid crystal display device etc.) etc..Adhesive appropriate (adhesive composition) can be used in first adhesive phase, for its type It is not particularly limited.For adhesive, it can enumerate：It is rubber adhesive, acrylic adhesives, polysiloxane-based viscous Mixture, polyurethane binding, vinyl alkyl ethers adhesive, polyvinyl alcohol series adhesive, polyvinylpyrrolidone class are viscous Mixture, polyacrylamide adhesive, cellulose family adhesive etc..In these adhesives (adhesive composition), it is preferable to use Optical transparence is excellent, shows the adhesion characteristics and weatherability, heat resistance etc. such as wetability, coherency and adhesivity appropriate Excellent adhesive.Adhesive as feature as display is, it is preferable to use acrylic adhesives.

It is made for forming the method for first adhesive phase, such as by the following method etc.：By above-mentioned bonding Agent (adhesive composition) is coated on the partition after lift-off processing, and polymer solvent etc. is dried and removed, to form adhesive Layer, the method for being then transferred to polarization plates；Or above-mentioned adhesive is being coated on polarization plates, and the drying such as polymer solvent is removed It goes, the method to form adhesive phase on the polarizer.It should be noted that when coating adhesive, suitably can newly add Add more than one solvents in addition to polymer solvent.As for the partition after lift-off processing, it is preferable to use polysiloxanes partition.

On above-mentioned adhesive (adhesive composition) to be applied to such partition and it is dried and forms adhesive In the process of layer, for the method for making adhesive dry, suitable method can be suitably used according to purpose.It is preferable to use By the method for above-mentioned film heat drying.Heat drying temperature is preferably 40 DEG C~200 DEG C, is more preferably 50 DEG C~180 DEG C, particularly preferably 70 DEG C~170 DEG C.By the way that heating temperature is set as above range, the bonding for having excellent can be obtained The adhesive phase of characteristic.

For the forming method of adhesive phase, various methods can be used.Specifically, can for example enumerate：Roller Coating, roller lick rubbing method, gravure coating process, reversed rubbing method, roller brush method, spray coating method, dipping roller coating method, scraper rubbing method, Scraper for coating method, air knife coating method, curtain coating method, lip coating method, the extrusion coating methods etc. using die coater etc. Method.

The thickness of first adhesive phase is preferably 2 μm~50 μm, more preferably 2 μm~40 μm, further preferably 5 μm~ 35μm。

Partition can protect first adhesive phase until for practicality.For the constituent material of partition, example It can such as enumerate：The plastic foils such as polyethylene, polypropylene, polyethylene terephthalate, polyester film；Paper, cloth, non-woven fabrics etc. are more Porous materials；The thin paper shape object (Bao Leaf bodies appropriate such as mesh, foamed sheet, metal foil and their layered product) etc., it is flat from surface , it is preferable to use plastic foil from the viewpoint of slip is excellent.For the plastic foil, as long as above-mentioned adhesive phase can be protected Film be just not particularly limited, such as can enumerate：Polyethylene film, polypropylene screen, polybutene film, polybutadiene film, poly- methyl Amylene film, polychloroethylene film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate (PBT) Film, polyurethane film, vinyl-vinyl acetate copolymer film etc..

Above-mentioned partition can also be carried out as needed utilizing polysiloxane-based, fluorine-containing type, chain alkyl class or aliphatic acid The antistatics such as the demoulding of the releasing agent or silicon dioxide powder of amides etc. and antifouling process or application type, kneading type, vapor deposition type Processing.Polysiloxanes processing, chain alkyl processing, fluorine processing etc. are suitably carried out especially by the surface to above-mentioned mold release film Lift-off processing can further increase the fissility from above-mentioned first adhesive phase.

The thickness of above-mentioned partition is preferably generally 5 μm~50 μm, further preferably 20 μm~40 μm.

Polarization plates disclosed herein can also be in addition to the polarizer protective film comprising antistatic backing and base material, polarization Also implement comprising other layers of mode other than device and middle layer (Jie is in Layer) (gluing oxidant layer, first adhesive phase etc.).

Embodiment

Hereinafter, being illustrated to several embodiments related to the present invention, but it is not intended to and limits the invention to the tool Content represented by body example.It should be noted that unless otherwise specified, " part " and " % " in following the description is weight base It is accurate.In addition it is shown that the use level (additive amount) in table.

In addition, each characteristic in following explanation is determined or evaluates in the manner as described below respectively.It needs to illustrate , the preparation method of the polarizer protective film about following records, prepared by the composition etc. recorded in table 1.

<The measurement of thickness and thickness distribution>

The digital thickness meter manufactured using Toyo Seiki company determines the thickness distribution (thickness) of width direction.It needs It is noted that the thickness distribution as the polarizer protective film in the present invention, it is often preferred that 5 μm~50 μm, further Preferably 10 μm~30 μm.It, can be while being maintained as the mechanical property of polarizer protective film when within the above range Optical characteristics is not damaged, therefore preferably.

<The measurement (nano-hardness tester) of cohesiveness>

Indentation test is carried out under the following conditions to the antistatic backing of polarizer protective film, by its result find out base material/ Cohesiveness (GPa) between antistatic backing.

(measurement device and determination condition)

Measurement device：Tribo Indenter (Hysitron Inc. manufactures)

The pressure head used：Berkovich (triangular pyramid type)

Assay method：Single indentation assaying

Measuring temperature：80℃

Depth of cup is set：About 70nm

Press-in speed：About 10nm/ seconds

Measure atmosphere：In air

(assay method)

Using above-mentioned apparatus, from room temperature to 80 DEG C and is kept for 1 hour, then utilize Berkovich type Buddha's warrior attendants made of stones Pressure head determines shape image.On the antistatic backing surface of polarizer protective film, vertically it is pressed into from surface using above-mentioned pressure head To depth 70nm.Using analysis software " Triboscan Ver.9.2.12.0 ", it is bent to will be pressed into the load-displacement obtained when pressure head Area in line is as cohesiveness (GPa).

It should be noted that for cohesiveness as the polarizer protective film in the present invention, preferably 0.1GPa with Upper, more preferably 0.2GPa.When within the above range, becomes the excellent state of the adherency of base material and antistatic backing, be preferred.

<The measurement of adhesion strength>

In the antistatic of polarizer protective film under conditions of line pressure is 8Kg/m, crimping speed is 0.3m/ minutes Layer surface crimps adhesive tape " No.31B " of manufacture (Nitto Denko Corp), and after crimping, it is small at 50 DEG C to save 48 When.After preservation, removed (according to JIS-Z- with the disbonded test that 30m/ minutes tensile speeds are removed by 180 ° 0237)。

It should be noted that in evaluation in table 1, antistatic backing when while measuring adhesion strength to stripping it is de- Fall, the destruction of antistatic backing (cohesion destroy, interface peel) etc. is confirmed, carried out overall merit.Evaluation is according to following bases It is accurate.

○：Peeling force can not measure (not peelable, strong), be visible by naked eyes fall off, the destruction of antistatic backing.

×：Peeling force is 1.0N/18mm or less (can be easily peeled off, is weak) or has and macroscopic fall off, is anti-quiet The destruction of electric layer.

In addition, in evaluation in table 2, glass transition temperature (Tg) is 120 DEG C, and the thickness of antistatic backing is made to be fixed as 100nm changes draft temperature, to be evaluated adhesion strength.In evaluation in table 3, glass transition temperature (Tg) is 120 DEG C, change the thickness of antistatic backing, to be evaluated adhesion strength.

<The measurement of the sheet resistance value on antistatic backing surface>

Under 23 DEG C of temperature, the atmosphere of humidity 50%RH, resistance determinator (Hiresta, Mitsubishi of Co., Ltd. chemistry are utilized Analytech) according to JIS-K-6911-1995 to the sheet resistance value on the antistatic backing surface of polarizer protective film (Ω/ ) it is determined.Using Registrationtable UFL Teflon (registered trademark) electrode, voltage will be applied and be set as Since the reading of 10V, sheet resistance value carry out measuring after 10 seconds.

It should be noted that the sheet resistance value of the antistatic backing surface measurements of polarizer protective film in the present invention (Ω/) is preferably 1.0 × 10¹²Below, 1.0 × 10 are more preferably¹⁰Below, it is more preferably 1.0 × 10⁴~1.0 × 10⁹, particularly preferably 1.0 × 10⁴~1.0 × 10⁹.Antistatic backing with the sheet resistance value shown in above range Polarizer protective film such as can be suitably used as the processing of the article of deterrent electrostatic as liquid crystal cells, semiconductor device or The polarizer (polarization plates) with polarizer protective film used in transport process etc..In addition, showing table in above range Even if the polarizer protective film of surface resistance value carries polarization plates on contact panel sensor and is glued in above-mentioned polarization plates Confirming operation can also be carried out in the state of surface protection film by posting, and be useful.

<The measurement of stripping charge voltage>

Under 23 DEG C of temperature, the atmosphere of humidity 50%RH, measured using the electrostatic potential of Kasuga Electric K. K.'s manufacture Instrument KSD-0103 determines with stripping in 10m/ minutes the sample for being laminated with polarizer protective film from the position of height 10cm Speed carries out the stripping charge voltage generated when 180 ° of strippings.

It should be noted that stripping charge voltage refers to being mainly derived from preventing for the polarizer protective film for constituting the present invention The stripping charge voltage of electrostatic layer, contributes to anti-release band electrical.

For the stripping charge voltage (absolute value) of polarization plates surface protection film as the present invention, preferably 0.4kV Below, it is more preferably 0.3kV or less.When above-mentioned stripping charge voltage is more than 0.4kV, the polarizer array in polarization plates is by dry It disturbs, therefore not preferably.

[Examples 1 to 4]

<The preparation of polarizer protective film (using electric conductive polymer+heat fusing)>

Using bar #6 as the transparent guarantor for including (methyl) acrylic resin with lactone ring structure of base material Cuticula (Tg：120 DEG C, embodiment below and comparative example all employ same transparent protective film) on the long rapids chemical conversion company of coating Then the Denatron P-502RG (containing PEDOT/PSS) of manufacture utilize the KARO IV films of BRUCKNER companies manufacture in batches Stretching-machine preheats transparent protective film (base material) and film (antistatic backing) 30 seconds and at 150 DEG C with 6%/second at 150 DEG C Strain rate is stretched, to make sample.It should be noted that about stretching ratio, as shown in table 1, in each example Multiplying power uses phase same multiplying on two direction of width direction (TD) and length direction (MD).In addition, as shown in table 1, in each example Evaluation when the thickness of antistatic backing use 20nm, 50nm, 100nm.

[comparative example 1]

<The polarizer preparation of protective film (heating (drying) using electric conductive polymer+only)>

By as transparent protective film of the base material comprising (methyl) acrylic resin with lactone ring structure in width Direction (TD) and length direction (MD) stretch 2 times respectively on two directions, and long rapids chemical conversion is then applied on the film using bar #6 The Denatron P-502RG of company's manufacture, it is then 60 seconds dry at 150 DEG C, to make sample.

[comparative example 2]

<The preparation of polarizer protective film (electric conductive polymer use+solvent penetration)>

On the transparent protective film comprising (methyl) acrylic resin with lactone ring structure as base material, prepare Liquid obtained from being added to the dimethyl ketone of 10 weight % in the Denatron P-502RG of the rapids chemical conversion company manufacture of length is simultaneously It is applied using bar #6, then utilizes the KARO IV film batch stretchers of BRUCKNER companies manufacture, preheated 30 seconds at 150 DEG C And 2 times are respectively stretched with the strain rate of 6%/second, on two direction of width direction (TD) and length direction (MD) at 150 DEG C, To make sample.It should be noted that due to the use of the dimethyl ketone as solvent, therefore, solvent permeates, really Recognize and forms permeable formation (mixed layer) in the interface of base material and antistatic backing.

[comparative example 3]

<The preparation of polarizer protective film (using metal oxide+heat fusing)>

It is applied on the transparent protective film comprising (methyl) acrylic resin with lactone ring structure using bar #6 The tin type oxide S-1 that Mitsubishi's Material electronics chemical conversion corporation is made, then utilizes the KARO IV of BRUCKNER companies manufacture Film batch stretcher transparent protective film (base material) and film (antistatic backing) are preheated 30 seconds at 150 DEG C and at 150 DEG C with The strain rate of 6%/second is stretched, to make sample.

[comparative example 4]

<The preparation of polarizer protective film (using ionic liquid+heat fusing)>

It is applied on the transparent protective film comprising (methyl) acrylic resin with lactone ring structure using bar #6 Then the Saftomer ST-1000 of Mitsubishi Chemical Ind's manufacture utilize the KARO IV films of BRUCKNER companies manufacture to draw in batches It stretches machine and transparent protective film (base material) and film (antistatic backing) is preheated into 30 seconds and the answering with 6%/second at 150 DEG C at 150 DEG C Variable Rate is stretched, to make sample.

[comparative example 5]

<The preparation of polarizer protective film (using metal salt/inorganic salts+heat fusing)>

It is applied on the transparent protective film comprising (methyl) acrylic resin with lactone ring structure using bar #6 Then the 1SX-1055 of great achievement Fine Chemical companies manufacture utilizes the KARO IV films of BRUCKNER companies manufacture to draw in batches It stretches machine and transparent protective film (base material) and film (antistatic backing) is preheated into 30 seconds and the answering with 6%/second at 150 DEG C at 150 DEG C Variable Rate is stretched, to make sample.

[embodiment 5-1~5-3 and comparative example 6-1~6-3]

<The preparation of polarizer protective film (using electric conductive polymer+heat fusing)>

It is public using the rapids chemical conversion of length on the transparent protective film comprising (methyl) acrylic resin with lactone ring structure The Denatron P-502RG of manufacture are taken charge of under various draft temperatures (heating draft temperature) so that antistatic backing after stretching Thickness be 100nm mode sample has been made by the same method with embodiment 1 etc..It should be noted that the drawing in table 2 It stretches multiplying power and all uses 2 times of width direction (TD), 2 times of length direction (MD).

[embodiment 6-1~6-3 and comparative example 7-1~7-2]

<The preparation of polarizer protective film (using electric conductive polymer+heat fusing)>

It is applied on the transparent protective film comprising (methyl) acrylic resin with lactone ring structure using bar #6 The Denatron P-502RG of long rapids chemical conversion company manufacture, then utilize the KARO IV films of BRUCKNER companies manufacture to draw in batches It stretches machine and transparent protective film (base material) and film (antistatic backing) is preheated into 30 seconds and the answering with 6%/second at 140 DEG C at 140 DEG C Variable Rate is stretched, to make sample (temperature is fixed as 140 DEG C).In addition, after controlling stretching ratio and stretching The thickness of antistatic backing be adjusted as shown in table 3, sample has been made by the same method with embodiment 1 etc..It needs Bright, the stretching ratio in table 3 all uses 2 times of width direction (TD), 2 times of length direction (MD).

It, will be above-mentioned various with co content, preparation condition, progress for the polarizer protective film of embodiment and comparative example Measure and evaluation result it is shown in table 1~table 3 in.

Table 2

Table 3

It is confirmed according to table 1：In embodiment, the heat after the adherent fashion of base material and antistatic backing is heated and stretching The state (melting is fixed) of melting, therefore, the cohesiveness, adhesion strength between base material and antistatic backing are excellent, static electricity resistance, anti-stripping Charging property is also excellent.Especially for stretching ratio is set as 1.5 times or more and 3.0 times or less and the embodiment for preparing and Speech, confirms：The thickness distribution that can obtain width direction is very narrow, thickness does not have uniform polarizer protection devious Film.

On the other hand, it is confirmed in comparative example 1：Due to only being heated (drying) without being stretched, do not have There are the uniform heat fusing generated between base material and antistatic backing, poor adhesion to be confirmed in comparative example 2：It is molten due to being utilized Agent is permeated, therefore the cohesion force difference between base material and antistatic backing.In addition, being confirmed in comparative example 3~5：Make in antistatic backing With metal oxide etc. rather than electric conductive polymer, therefore, the heat fusing by implement heating and stretching cannot Maintain static electricity resistance, anti-release band electrical.

According to table 2, as the base material and antistatic backing for constituting polarizer protective film, in the glass transition temperature of base material For 120 DEG C, the thickness of antistatic backing is fixed on 100nm in the case of only changing draft temperature, draft temperature is less than base material At Tg+20 DEG C (comparative example 6-1~6-3), confirm：The heat fusing between base material and antistatic backing, poor adhesion are not generated.It is another Aspect when draft temperature is Tg+20 DEG C of base material or more (embodiment 5-1~5-3), confirms heat fusing (melting is fixed) state, And confirm the degree for being glued to can not measure adhesion strength securely.

According to table 3, as the base material and antistatic backing for constituting polarizer protective film, in the glass transition temperature of base material In the case of being fixed on 140 DEG C for 120 DEG C, by draft temperature and only changing the thickness of antistatic backing, the thickness of antistatic backing is When 100nm or less (embodiment 6-1~6-3), confirm：Adhesion strength between base material and antistatic backing is good, also broken without occurring It is bad.On the other hand, it when the thickness of antistatic backing is more than 100nm (comparative example 7-1~7-2), finds the reduction of adhesion strength, confirms It is destroyed in the interlayer of base material and antistatic backing.

Industrial applicability

Polarization plates use is made in polarizer protective film disclosed herein by being laminated in polarizer, can compatibly use Make the constituent element of liquid crystal display panel, plasma display panel (PDP), organic electroluminescent (EL) display etc..

Claims (9)

1. a kind of polarizer protective film, with base material and on the single side of the base material by containing electric conductive polymer The antistatic backing that antistatic agent composition is formed, which is characterized in that

The base material is melted fixed and has orientation, the antistatic with antistatic backing in the case where not mixed The thickness of layer is 100nm or less.

2. polarizer protective film as described in claim 1, which is characterized in that the base material is with (methyl) acrylic resin It is formed as main component.

3. polarizer protective film as described in claim 1, which is characterized in that the antistatic agent composition contain it is poly- (3, 4- ethyldioxythiophenes)/polystyrolsulfon acid (PEDOT/PSS) the conduct electric conductive polymer.

4. polarizer protective film according to any one of claims 1 to 3, which is characterized in that the table of the antistatic backing Surface resistance value is 1.0 × 10¹²Ω/ or less.

5. a kind of manufacturing method of polarizer protective film is protected for polarizer according to any one of claims 1 to 4 The manufacturing method of film, which is characterized in that the manufacturing method includes：

The antistatic agent composition described in the one side coating of the base material and formed film process and

The base material is carried out together with the film at the temperature of+20 DEG C of the glass transition temperature Tg of the base material or more Heating and the process stretched.

6. the manufacturing method of polarizer protective film as claimed in claim 5, which is characterized in that described to be heated and stretched Process be that biaxial stretch-formed work is simultaneously or sequentially carried out in width direction and length direction using stenter formula stretching-machine Sequence.

7. as polarizer protective film described in claim 5 or 6 manufacturing method, which is characterized in that it is described while according to It is secondary to carry out biaxial stretch-formed stretching ratio respectively 1.5 times or more and 3.0 times or less in width direction and length direction.

8. a kind of manufacturing device of polarizer protective film is protected for polarizer according to any one of claims 1 to 4 The manufacturing device of film, which is characterized in that the manufacturing device includes：

The antistatic agent composition described in the one side coating of the base material and formed film film formed unit and

The base material is carried out together with the film at the temperature of+20 DEG C of the glass transition temperature Tg of the base material or more Heating and the heating draw unit stretched.

9. the manufacturing device of polarizer protective film as claimed in claim 8, which is characterized in that the heating draw unit makes With stenter formula stretching-machine.