TWI746764B - Polarizing plate - Google Patents

Abstract

The present invention provides an optical member with a surface protective film for polarizing plate, which uses a polarizing plate (polarizing plate) with a specific configuration (laminating order) and a surface protective film for polarizing plate (polarizing plate). When the polarizing plate is laminated (adhered) to a liquid crystal display device (LCD), etc. and the surface protective film for the polarizing plate is peeled off after use, it can prevent the whitening of the panel of the liquid crystal display device or the destruction of the label, and it has excellent peeling resistance and charging resistance. Excellent pollution and durability. The polarizing plate with the surface protective film for polarizing plate of the present invention has a polarizing plate and a surface protective film for polarizing plate. The protective film for a polarizer has an antistatic layer formed of an antistatic agent composition containing a conductive polymer on the opposite side of the contact surface of the polarizer, and the surface protective film for a polarizer has a substrate film and the substrate A single-sided adhesive layer of the film has an antistatic layer on the opposite side of the contact surface between the base film and the adhesive layer, and the polarizing plate with the surface protective film for polarizing plate is characterized in that the surface The protective film is laminated on the antistatic layer of the polarizing plate via the adhesive layer of the surface protective film for polarizing plates.

Description

Polarizing plate Invention field

The present invention relates to a polarizing plate with a surface protective film for polarizing plate. In particular, the above-mentioned polarizing plate with a surface protective film can be formed into a liquid crystal display device (LCD), an organic electroluminescence (EL) display device, a cathode ray picture tube ( CRT), plasma display panel (PDP) and other image display devices.

Background technique

For liquid crystal display devices, organic EL display devices, etc., depending on the image forming method, for example, in the liquid crystal display device, it is indispensable to arrange a polarizer in the liquid crystal cell, and a polarizing plate is usually pasted.

For example, in the manufacture of liquid crystal display panels, for the polarizing plate bonded to the liquid crystal cell, in order to prevent damage, stains, etc. during processing, transportation, etc., through the adhesive constituting the surface protection film for the polarizing plate Layer and stick to the surface of the polarizer. However, this surface protection film is peeled and removed at the stage when the surface protection film is no longer needed. However, static electricity is generated during peeling, causing problems such as whitening of the liquid crystal panel or destruction of the label.

In order to suppress the generation of static electricity, attempts have been made to add antistatic agents such as alkali metal salts to the adhesive layer to impart antistatic properties (for example, patents Literature 1).

Prior art literature Patent literature

Patent Document 1: Japanese Patent Application Publication No. 2009-251281

Summary of the invention

However, by adding an antistatic agent to the adhesive layer as in Patent Document 1, problems such as insufficient adhesive force based on the adhesive layer, or the antistatic agent oozing out and contaminating the surface of the polarizing plate, etc., are difficult to balance the adhesion characteristics and resistance. Pollution.

In addition, in the polarizing plate after peeling off the surface protective film for polarizing plates, problems such as scratches may occur in subsequent processes, and durability such as scratch resistance is required.

Therefore, in the present invention, intensive studies have been conducted in view of the above-mentioned circumstances. As a result, the object of the present invention is to provide an optical member with a surface protective film for polarizing plate, which uses a polarized light with a specific configuration (layering order). The polarizing plate (polarizing plate) of the surface protective film for the plate can prevent the liquid crystal display device and the like when the polarizing plate is laminated (sticked) on the liquid crystal display device, etc., and the surface protective film for the polarizing plate is peeled off after use. The whitening of the panel or the destruction of the label is excellent in anti-peeling and electrification, and also excellent in stain resistance and durability.

That is, the polarizing plate with a surface protective film of the present invention There are a polarizer and a surface protection film for a polarizer, the polarizer having a polarizer and a polarizer protective film on at least one side of the polarizer, and on the opposite side of the polarizer protective film and the polarizer contact surface It has an antistatic layer formed of an antistatic agent composition containing a conductive polymer, the surface protective film for polarizing plates has a substrate film and an adhesive layer on one side of the substrate film, and is on the substrate The antistatic layer is provided on the opposite side of the contact surface between the film and the adhesive layer, and the polarizing plate with the surface protective film for polarizing plate is characterized in that the surface protective film for polarizing plate passes through the adhesive of the surface protective film for polarizing plate The layer is laminated on the antistatic layer of the above-mentioned polarizing plate, and the adhesive composition forming the above-mentioned adhesive layer does not contain an antistatic component.

In the polarizing plate with a surface protective film of the present invention, the protective film for polarizers is preferably selected from (meth)acrylic resins, cyclic olefin resins, polyester resins, and polycarbonate resins. At least one resin in the constituent group is formed.

In the polarizing plate with a surface protective film of the present invention, it is preferable that the protective film for a polarizer has an ultraviolet absorbing function.

The polarizing plate with the surface protective film for polarizing plate of the present invention includes a surface protective film for polarizing plate and a polarizing plate. An adhesive layer formed of an agent composition, the polarizing plate having an antistatic layer formed of an antistatic agent composition containing a conductive polymer, a protective film for a polarizer, and a polarizer, and the surface protective film for a polarizing plate The antistatic layer of the polarizing plate is laminated on the antistatic layer of the polarizing plate via the adhesive layer of the surface protective film for polarizing plate, thereby forming a polarizing plate (polarizing plate) with a surface protective film for polarizing plate having a specific configuration (layering order), When the polarizing plate is laminated (adhered) to a liquid crystal display device (LCD), etc., when the surface protective film for the polarizing plate is peeled off, the antistatic layer constituting the surface protective film for the polarizing plate and the antistatic layer constituting the polarizing plate are specified The position (stacking order) can prevent the whitening of the panel of the liquid crystal display device or the destruction of the label by this, and it is useful because it is excellent in anti-peeling chargeability. In addition, since the adhesive layer (substantially) does not contain antistatic components, it is possible to prevent contamination caused by the antistatic components in the adhesive layer, and has excellent contamination resistance. In addition, the antistatic layer of the polarizing plate It is formed from an antistatic agent composition containing a conductive polymer and can provide an optical member with a surface protective film for polarizing plate that is excellent in flexibility and durability (scratch resistance), and is useful.

1: Polarizing plate with surface protective film for polarizing plate

2: Surface protective film for polarizing plate

3: Polarizing plate

10: Anti-static layer

11: Substrate film

12: Adhesive layer

20: Anti-static layer

21: Protective film for polarizing parts

22: Polarizing parts

23: The first adhesive layer

24: retardation film

30: Sample fixing table

31: Acrylic resin board

32: Potentiometer

FIG. 1 is a schematic cross-sectional view showing a configuration example of a polarizing plate with a surface protective film for polarizing plate of the present invention.

2 is a schematic cross-sectional view showing a configuration example of a polarizing plate with a surface protective film for polarizing plate of the present invention.

Fig. 3 is an explanatory diagram showing a method of measuring a peeling charging voltage.

detailed description

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

<Overall structure of polarizing plate with surface protective film for polarizing plate>

The polarizing plate with the surface protective film for polarizing plate disclosed herein includes, for example, the polarizing plate with the surface protective film for polarizing plate as shown in FIG. 11 has an adhesive layer 12 laminated on at least one side, and an antistatic layer 10 laminated on the other side. The polarizing plate 3 is constituted by laminating a polarizer protective film 21 on at least one side of the polarizer 22, and protecting the polarizer An antistatic layer 20 is laminated on the opposite surface of the film 21 and the polarizer contact surface. In addition, a polarizing plate 1 with a surface protective film for polarizing plate having a configuration in which a polarizing plate surface protection film is directly laminated (contacted) on the antistatic layer 20 of the polarizing plate 3 via an adhesive layer 20 can be cited. In addition, the polarizing plate with the surface protective film for polarizing plates disclosed herein may be in a roll shape or in a paper shape (leaflet shape).

<Base film of surface protective film for polarizing plate>

The surface protective film for polarizing plates used in the present invention is characterized in that the surface protective film for polarizing plates has a base film and an adhesive layer on one side of the base film, and the base film and the adhesive The opposite side of the layer contact surface has an antistatic layer. In the technology disclosed herein, the resin material constituting the substrate film can be used without particular limitation. For example, transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, flexibility, dimensional stability, etc. are preferably used. Materials with excellent properties. In particular, since the base film has flexibility, the adhesive composition can be applied with a roll coater or the like, and it can be wound into a roll shape, which is useful.

As the above-mentioned base film (substrate, support), for example, a polyester-based polymer, a cellulose-based polymer, a polycarbonate-based polymer, an acrylic polymer, etc. can be preferably used as the main resin component (resin become A plastic film composed of a resin material, which is the main component of the component, typically a component that accounts for 50% by weight or more, is used as the above-mentioned base film. It may also be a base film containing a blend of two or more of these polymers.

Various additives such as antioxidants, ultraviolet absorbers, plasticizers, and colorants (pigments, dyes, etc.) can be blended in the resin material constituting the above-mentioned base film as necessary. For example, known or commonly used surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and primer coating can be performed. Such surface treatment may be, for example, a treatment for improving the adhesion between the base film and the adhesive layer (anchoring properties of the adhesive layer).

The surface protective film for a polarizing plate used in the present invention can also use a plastic film that has been subjected to an antistatic treatment as the base film. By using the above-mentioned base film, it is possible to suppress the electrification of the surface protective film for polarizing plate itself at the time of peeling, which is preferable. In addition, when the base film is a plastic film and the above-mentioned plastic film is treated with anti-static treatment, it is possible to obtain a polarizing plate surface that reduces the charge of the surface protective film for polarizing plate itself and has excellent antistatic ability to adherends. Protective film. It should be noted that the method of imparting antistatic function is not particularly limited, and conventionally known methods can be used. Examples include: coating an antistatic resin or conductive polymer containing an antistatic agent and a resin component, and The method of the conductive resin of the conductive material, the method of vapor deposition or plating of the conductive material, the method of kneading an antistatic agent, and the like.

The thickness of the substrate film is 50 μm or more, preferably 50 μm to 200 μm, more preferably 70 μm to 150 μm, and still more preferably 75μm~130μm. When the thickness of the substrate film is within the above range, it is preferable that the surface protection film for a polarizing plate is bonded to a polarizing plate with good laminating workability and transportability after laminating.

<Adhesive layer of surface protective film for polarizing plate>

The adhesive layer constituting the surface protection film for polarizing plates used in the present invention is characterized in that it is formed of an adhesive composition, and the adhesive composition does not contain an antistatic component. As long as the above-mentioned adhesive composition contains an adhesive polymer and the above-mentioned adhesive polymer has adhesiveness, it can be used without particular limitation. As the aforementioned adhesive composition, for example, acrylic adhesives containing (meth)acrylic polymers, polyurethane adhesives containing polyurethane polymers, and polysiloxanes containing polysiloxane polymers are used. It is particularly preferable to use an acrylic adhesive containing a (meth)acrylic polymer from the viewpoint of adhesiveness, transparency, and the like.

In the adhesive layer used in the present invention, the adhesive composition preferably contains a crosslinking agent. In addition, in the present invention, the above-mentioned adhesive composition may be used to form an adhesive layer. For example, in the case where the above-mentioned adhesive composition is an acrylic adhesive containing the above-mentioned (meth)acrylic polymer, by appropriately adjusting the structural unit, composition ratio, and crosslinking agent of the above-mentioned (meth)acrylic polymer By selecting and adding the ratio and performing crosslinking, it is possible to obtain an adhesive layer (surface protective film for polarizing plate) that is more excellent in heat resistance.

As the above-mentioned crosslinking agent, isocyanate compounds, epoxy compounds, melamine-based resins, aziridine derivatives, and gold can be used. It is a chelate compound, etc., and it is particularly preferable to use an isocyanate compound. In addition, these compounds may be used singly or in combination of two or more kinds.

In addition, the above-mentioned adhesive composition may contain other well-known additives. For example, powders such as crosslinking catalysts, lubricants, colorants, pigments, plasticizers, tackifiers, etc. may be appropriately added according to the intended use. Low molecular weight polymers, surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, ultraviolet absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metal powders, particulates, Foil etc.

It should be noted that the above-mentioned adhesive composition is characterized in that it does not contain an antistatic component, and "does not contain an antistatic component" means that it does not substantially contain an antistatic agent, and refers to an adhesive layer that does not exert an antistatic function (for example, The surface resistance value of the adhesive layer surface is 10 ¹³ or more). It should be noted that when the above-mentioned adhesive composition contains an anti-static component, contamination caused by the transfer of the anti-static component from the adhesive layer is usually generated. The adhesive layer used in the present invention uses the above-mentioned adhesive The composition does not substantially contain an antistatic component, so that this contamination can be prevented, and the contamination resistance is excellent, which is a preferred aspect.

<Antistatic layer of surface protective film for polarizing plate>

The surface protective film for a polarizing plate used in the present invention is characterized in that it has a base film and an adhesive layer on one side of the base film, and is on the opposite side of the contact surface of the base film and the adhesive layer. With anti-static layer. An anti-static layer is provided on the outermost layer (the back of the base film) of the above-mentioned surface protective film for polarizing plates, which can exert a grounding effect and prevent peeling. Excellent electrical properties, which is a better way.

In order to form the antistatic layer, it is preferable to perform an antistatic treatment on the base film. As the above-mentioned antistatic treatment, a normal antistatic treatment method can be used, and is not particularly limited. For example, a method of providing an antistatic layer on the back surface of the base film (the surface opposite to the adhesive layer) can be used.

As a method of providing the above-mentioned antistatic layer, there may be mentioned: an antistatic agent or an antistatic resin containing an antistatic agent and a resin component, a conductive resin composition containing a conductive substance and a resin component, or a conductive polymer The method of coating on the base film, the method of vapor-depositing or plating a conductive substance, etc.

Examples of the aforementioned antistatic agent include: cationic antistatic agents having cationic functional groups such as quaternary ammonium salts and pyridinium salts (for example, the first amino group, the second amino group, and the third amino group); Anionic antistatic agents with anionic functional groups such as sulfonate, sulfate, phosphonate, and phosphate; alkyl betaine and its derivatives, imidazoline and its derivatives, alanine and its derivatives, etc. Zwitterionic antistatic agent; nonionic antistatic agent such as amino alcohol and its derivatives, glycerin and its derivatives, polyethylene glycol and its derivatives; Type antistatic agent, an ion conductive polymer obtained by polymerizing or copolymerizing monomers of the ion conductive group shown in the zwitterionic antistatic agent.

Specifically, as the above-mentioned cationic antistatic agent, alkyl trimethyl ammonium salt, acrylamide propyl trimethyl ammonium methyl sulfate salt, alkyl benzyl methyl ammonium salt, Choline chloride, poly (Meth)acrylate copolymers with quaternary ammonium groups such as dimethylaminoethyl methacrylate, styrene copolymers with quaternary ammonium groups such as polyvinylbenzyltrimethylammonium chloride, Polydiallyldimethylammonium chloride and other diallylamine copolymers having quaternary ammonium groups. Examples of the above-mentioned anionic antistatic agents include: alkyl sulfonates, alkylbenzene sulfonates, alkyl sulfates, alkyl ethoxy sulfates, alkyl phosphates, and sulfonic acid-containing salts. -Based styrene copolymers, etc. As said zwitterionic antistatic agent, alkyl betaine, alkyl imidazolium betaine, carbonized betaine graft copolymer, etc. are mentioned. Examples of the above-mentioned non-ionic antistatic agent include: fatty acid alkanolamine, di(2-hydroxyethyl)alkylamine, polyoxyethylene alkylamine, fatty acid glyceride, polyoxyethylene glycol Fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan ether fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ether, polyethylene glycol, polyoxyethylene Diamine, copolymer composed of polyether, polyester and polyamide, methoxy polyethylene glycol (meth)acrylate, etc.

As said conductive polymer, polyaniline, polypyrrole, polythiophene, etc. are mentioned.

Examples of the above-mentioned conductive substances include tin oxide, antimony oxide, indium oxide, cadmium oxide, titanium oxide, zinc oxide, indium, tin, antimony, gold, silver, copper, aluminum, nickel, chromium, titanium, iron , Cobalt, copper iodide, and their alloys or mixtures, etc.

As the above-mentioned resin component, general-purpose resins such as polyester resins, acrylic resins, polyethylene compound resins, polyurethane resins, melamine resins, and epoxy resins can be used. It should be noted that anti-static When the electrical agent is a polymer type antistatic agent, the antistatic resin may not contain the above-mentioned resin component. In addition, the antistatic resin may also contain methylolated or hydroxyalkylated melamines, ureas, glyoxal, acrylamides and other compounds, epoxy compounds, and isocyanate compounds as crosslinking agents.

The coating-based method for forming the antistatic layer includes the following method: diluting the antistatic resin, conductive polymer, and conductive resin composition with an organic solvent or a solvent such as water or a dispersion medium to dilute The coating liquid is applied to the base film and dried. As said organic solvent, methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexanone, n-hexane, toluene, xylene, methanol, ethanol, n-propanol, isopropanol, etc. are mentioned. These etc. can be used individually or in combination of multiple types. Regarding the coating method, a well-known coating method can be used. Specifically, it can include: roll coating, gravure coating, reverse coating, roll brushing, spraying, air knife coating, dipping, and curtain coating .

The thickness of the antistatic layer (antistatic resin layer, conductive polymer layer, conductive resin composition layer) formed by the above coating is preferably 0.001 μm to 5 μm, more preferably 0.005 μm to 1 μm.

Examples of methods for vapor deposition or plating of the conductive substance include: vacuum vapor deposition, sputtering, ion plating, chemical vapor deposition, spray thermal decomposition, chemical plating, electroplating, etc. .

The thickness of the antistatic layer (conductive material layer) formed by the above-mentioned vapor deposition or plating is preferably 20 Å to 10000 Å (0.002 μm to 1 μm), More preferably, it is 50Å~5000Å (0.005μm~0.5μm).

<Surface protection film for polarizing plate>

The surface protective film for a polarizing plate used in the present invention is characterized in that it has a base film and an adhesive layer on one side of the base film, and is on the opposite side of the contact surface of the base film and the adhesive layer. It has an antistatic layer. As a method of forming an adhesive layer by cross-linking of the adhesive composition, it is usually carried out after the application of the adhesive composition, and the adhesive including the cross-linked adhesive composition The layer is transferred to the base film or the like.

In addition, the method of forming the adhesive layer on the base film is not particularly limited. For example, it can be produced by applying the above-mentioned adhesive composition (solution) to the base film, and drying and removing the polymerization solvent, etc. An adhesive layer is formed on the substrate film. Then, curing can be performed for the purpose of adjusting the component transfer of the adhesive layer or adjusting the crosslinking reaction. In addition, when the adhesive composition is coated on the substrate film to produce a surface protective film for polarizing plates, one or more solvents other than the polymerization solvent may be newly added to the adhesive composition to enable the substrate film Coat evenly on top.

In addition, as a method of forming the adhesive layer when manufacturing the surface protection film for polarizing plates used in the present invention, a known method used in the production of adhesive tapes can be used. Specifically, for example, a roll coating method, a gravure coating method, a reverse coating method, a roll brush method, a spray coating method, an air knife coating method, an extrusion coating method using a die coater, etc. can be cited.

The surface protective film for polarizing plate used in the present invention It is often made in such a way that the thickness of the adhesive layer is 3 μm-100 μm, preferably 5 μm-50 μm. When the thickness of the adhesive layer is within the above range, it is easy to obtain a proper balance between re-peelability and adhesiveness, which is therefore preferred.

In addition, the total thickness of the surface protective film for a polarizing plate used in the present invention is preferably 5 μm to 300 μm, more preferably 10 μm to 200 μm, and most preferably 12 μm to 100 μm. When it is within the above range, the adhesion characteristics (repeelability, adhesiveness, etc.), workability, and appearance characteristics are excellent, which is a preferable aspect. It should be noted that the above-mentioned total thickness refers to the total thickness of all layers including the base film, adhesive layer, antistatic layer, and other layers.

The surface protection film for polarizing plates disclosed here can be implemented in an aspect including other layers in addition to the base film, the adhesive layer, and the antistatic layer. As said other layer, the undercoat (anchor layer) etc. which improve the anchoring property of an antistatic layer or an adhesive layer etc. are mentioned.

<Polarizer>

The polarizing plate used in the present invention is characterized in that it has a polarizer, and a polarizer protective film on at least one side of the polarizer, and has a protective film on the opposite side of the polarizer protective film and the polarizer contact surface. An antistatic layer formed of an antistatic agent composition containing a conductive polymer. In addition, a polarizing plate having an adhesive layer laminated on at least one surface of the polarizing plate may be used, and other optical members (e.g., retardation film, Liquid crystal display device etc.) etc. In addition, it is a structure in which the antistatic layer located on the surface layer of the said polarizing plate and the adhesive layer which comprises the said surface protection film for polarizing plates directly laminated|stacked (contacted).

<Polarizer>

As the polarizer used in the present invention, a polarizer using polyvinyl alcohol-based resin can be used. Examples of polarizers include: absorbing dichroic substances such as iodine and dichroic dyes on polyvinyl alcohol-based films, partially methylated polyvinyl alcohol-based films, and partially saponified ethylene-vinyl acetate copolymers. A film obtained by uniaxially stretching a hydrophilic polymer film such as a film, a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol, and a dehydrochlorinated product of polyvinyl chloride. Among them, a polarizer containing a dichroic substance such as a polyvinyl alcohol film and iodine is preferable.

The polarizer obtained by dyeing the above-mentioned polyvinyl alcohol film with iodine and uniaxially stretched it can be produced by, for example, the following method: by immersing polyvinyl alcohol in an aqueous solution of iodine for dyeing and stretching to the original length 3~7 times of that. It may contain boric acid, zinc sulfate, zinc chloride, etc. as needed, and may be immersed in an aqueous solution such as potassium iodide. In addition, the polyvinyl alcohol-based film may be immersed in water for washing before dyeing if necessary. By washing the polyvinyl alcohol-based film with water, in addition to cleaning stains and anti-blocking agents on the surface of the polyvinyl alcohol-based film, it also has the effect of preventing unevenness such as uneven dyeing by swelling the polyvinyl alcohol-based film. Stretching may be performed after dyeing with iodine, or stretching may be performed at the same time as dyeing, and it may be dyed with iodine after stretching. Stretching can be performed in an aqueous solution of boric acid, potassium iodide, or the like, or in a water bath.

The thickness of the aforementioned polarizer can be appropriately determined, and is preferably 30 μm or less, more preferably 28 μm or less, and still more preferably 5 μm to 25 μm. For such a polarizer, the thickness unevenness is small, thin layer, The visibility is excellent, and the dimensional change is small, and therefore, the durability against thermal shock is excellent.

99.9(其中，T

42.3)的條件的方式構成。以滿足上述條件的方式構成的偏光件獨特地具有作為使用了大型顯示元件的液晶電視用的顯示器所要求的性能。具體而言，對比度比為1000：1以上並且最大亮度為500cd/m²以上。作為其它用途而言，例如貼合於有機EL單元的視覺辨認側。 The above-mentioned polarizer is preferably such that the optical characteristics represented by the monolithic transmittance (single transmittance) T and the degree of polarization P satisfy the following formula P>-(100.929T-42.4-1)×100 (where T<42.3) Or P

99.9 (where T

42.3) The condition of the composition. The polarizer configured to satisfy the above-mentioned conditions uniquely has the performance required as a display for liquid crystal televisions using a large display element. Specifically, the contrast ratio is 1000:1 or more and the maximum brightness is 500 cd/m ² or more. As for other uses, for example, it is attached to the visual recognition side of an organic EL unit.

<Protective film for polarizers>

The material constituting the protective film for polarizers is not particularly limited, but polymers (resins) that are excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and ultraviolet absorption are preferred. Examples include polyester polymers (polyester resins) such as polyethylene terephthalate and polyethylene naphthalate, and (meth)acrylic polymers such as polymethyl methacrylate. ((Meth)acrylic resin), polycarbonate polymer (polycarbonate resin), etc. In addition, polyethylene, polypropylene, polyolefin having a cyclic or norbornene structure (cyclic olefin resin), etc., can also be cited as examples of the polymer forming the protective film for polarizers. Among them, it is preferable that the protective film for polarizers is formed of at least one resin selected from the group consisting of (meth)acrylic resins, cyclic olefin resins, polyester resins, and polycarbonate resins, particularly It is preferable to use a resin having an ultraviolet absorbing function. These protective films for polarizers are usually glued The agent layer is attached to the polarizer.

In addition, the protective film for polarizers may contain one or more arbitrary suitable additives. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, colorants, and the like. The content of the polymer in the protective film for polarizers is preferably 50% by weight to 100% by weight, more preferably 50% by weight to 99% by weight, still more preferably 60% by weight to 98% by weight, particularly preferably 70% by weight. Weight%~97% by weight. When the content of the polymer in the protective film for polarizers is 50% by weight or less, there is a possibility that the high transparency etc. inherent in the polymer may not be sufficiently expressed.

The thickness of the protective film for polarizers can be appropriately determined. Generally, from the viewpoints of workability such as strength and handleability, thin layer properties, etc., it is preferably 100 μm or less, more preferably 80 μm or less, and still more preferably 10 μm to 60 μm.

Functional layers such as hard coat, anti-reflection layer, anti-adhesion layer, diffusion layer or anti-glare layer can be provided on the non-adhesive polarizer surface of the above-mentioned protective film for polarizer. It should be noted that the above-mentioned functional layers such as the hard coat layer, anti-reflection layer, anti-adhesion layer, diffusion layer, and anti-glare layer may be provided on the polarizer protective film itself, or separately from the polarizer protective film set up.

It should be noted that when the polarizer and the protective film for the polarizer are laminated, an easy-adhesive layer may be provided between the protective film for the polarizer and the adhesive layer.

<Anti-static layer of polarizing plate>

The polarizing plate with the surface protective film for polarizing plate of the present invention has a polarizing plate, the polarizing plate has a polarizing member, and a polarizing member protective film on at least one side of the polarizing member, and the polarizing member protective film is connected to the polarizer. The opposite side of the polarizer contact surface has an antistatic layer formed of an antistatic agent composition containing a conductive polymer, and the polarizing plate with a surface protective film for polarizing plate is characterized in that the surface for polarizing plate The protective film is laminated on the antistatic layer of the polarizing plate via the adhesive layer of the surface protective film for polarizing plates. The above-mentioned antistatic layer is an antistatic layer formed of an antistatic agent composition containing a conductive polymer. As a result, an increase in surface resistance can be suppressed even in a high-temperature environment, and an excellent flexibility and durability can be obtained. Anti-static layer is a better way.

In addition, by having an antistatic layer on the surface of the polarizing plate, it is not necessary to impart antistatic properties to the adhesive layer constituting the surface protective film for polarizing plate which is directly laminated (contacted) with the antistatic layer, in other words, there is no need to mix an antistatic component Therefore, it has excellent stain resistance and good aesthetics, which is preferable. In particular, compared with the case where the polyaniline sulfonic acid is blended alone or the polythiophene doped with polyanions is blended alone, by blending the polyaniline sulfonic acid and the polyanion-doped polythiophenes within the above range The reasons for the improved stability of antistatic properties in high-temperature environments of polythiophenes are presumed as follows. Regarding the polythiophenes doped with polyanions, the polythiophenes coordinate with the anionic groups of the polyanions to form a complex. The conductive mechanism of the polythiophene is known to include intramolecular conduction and polythiophene produced in the complex. The intermolecular conduction of thiophenes and the conduction between complex structures. Here, the complex structure Because of the long distance between the molecules, the conduction is a fast-determining process. It is speculated that by using polyaniline sulfonic acid, which has a higher molecular weight compared with polythiophenes, polyaniline sulfonic acid connects the complexes containing polythiophenes and polyanions, and it also has electrical conductivity. Therefore, it improves The electrical conductivity between the composites, the improvement of antistatic properties, and the increase of stability in high-temperature environments are very useful as polarizing plates. In addition, when the above-mentioned polyaniline sulfonic acid is used alone as the conductive polymer, the initial conductivity is low, and therefore, an increase in the peeling charging voltage or surface resistance value over time is likely to occur.

In addition, when the above-mentioned polythiophenes doped with polyanions are used alone, the initial conductivity is high, but as time goes by, the polyanions (corresponding to dopants) are more likely to be released than polythiophenes. Therefore, an increase in the peeling charging voltage and surface resistance value over time is likely to occur, which is undesirable.

<Conductive polymer>

The antistatic layer is preferably formed of an antistatic agent composition containing polyaniline sulfonic acid and polythiophenes doped with polyanions as conductive polymer components. With the combination of the above conductive polymers, polyaniline sulfonic acid is responsible for the conduction between the core-shell structure of polythiophene/polyanion, and therefore, the conductivity is improved, and it can be based on antistatic The anti-peeling and electrification properties of the layer and the stable anti-static properties in a high-temperature environment are useful.

The content of the conductive polymer is preferably 1% by weight to 90% by weight, more preferably 5% by weight to 80% by weight, and still more preferably 10% by weight to 70% by weight relative to all components contained in the antistatic layer. % By weight, preferably 20% by weight to 50% by weight. When the content of the conductive polymer is too small, the antistatic effect may be reduced, and when the content of the conductive polymer is too large, There is a possibility that the adhesion of the antistatic layer to the substrate (protective film for polarizers) may decrease, or the transparency may decrease, so it is undesirable.

For the polyaniline sulfonic acid used as the conductive polymer component, it is preferable that the weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) in terms of standard polystyrene is 5×10 ⁵ or less, more preferably It is 3×10 ⁵ or less. In addition, the weight average molecular weight of these conductive polymers is generally preferably 1×10 ³ or more, more preferably 5×10 ³ or more.

As a commercially available product of the polyaniline sulfonic acid, a brand name "aqua-PASS" manufactured by Mitsubishi Rayon Corporation, etc. can be exemplified.

Regarding the above-mentioned polythiophenes used as the conductive polymer component, for example, polythiophene, poly(3-methylthiophene), poly(3-ethylthiophene), poly(3-propylthiophene), Poly(3-butylthiophene), poly(3-hexylthiophene), poly(3-heptylthiophene), poly(3-octylthiophene), poly(3-decylthiophene), poly(3-decylthiophene) Alkylthiophene), poly(3-octadecylthiophene), poly(3-bromothiophene), poly(3-chlorothiophene), poly(3-iodothiophene), poly(3-cyanothiophene), poly (3-phenylthiophene), poly(3,4-dimethylthiophene), poly(3,4-dibutylthiophene), poly(3-hydroxythiophene), poly(3-methoxythiophene), Poly(3-ethoxythiophene), poly(3-butoxythiophene), poly(3-hexoxythiophene), poly(3-heptoxythiophene), poly(3-octoxythiophene), Poly(3-decyloxythiophene), poly(3-dodecyloxythiophene), poly(3-octadecyloxythiophene), poly(3,4-dihydroxythiophene), poly(3,4 -Dimethoxythiophene), poly(3,4-diethoxythiophene), poly(3,4-dipropoxythiophene), poly(3,4-dibutoxythiophene), poly(3,4-dibutoxythiophene) ,4-Dihexyloxythiophene), poly(3,4-diheptyloxythiophene), poly(3,4-dioctyloxythiophene), poly(3,4-didecoxythiophene), poly [3,4-Di(dodecyloxy)thiol Phene], poly(3,4-ethylenedioxythiophene), poly(3,4-propylenedioxythiophene), poly(3,4-butylenedioxythiophene), poly(3-methyl -4-methoxythiophene), poly(3-methyl-4-ethoxythiophene), poly(3-carboxythiophene), poly(3-methyl-4-carboxythiophene), poly(3-methyl 4-carboxyethylthiophene), poly(3-methyl-4-carboxybutylthiophene). These may be used alone, or two or more of them may be mixed and used. Among them, from the viewpoint of conductivity, poly(3,4-ethylenedioxythiophene) (PEDOT) is preferred.

As for the above-mentioned polythiophenes, the degree of polymerization is preferably 2 to 1,000, more preferably 5 to 100. When the degree of polymerization is within the above range, the conductivity is excellent, so it is preferred.

The above-mentioned polyanions are polymers having structural units of an anionic group, and function as dopants in polythiophenes. Examples of the above-mentioned polyanions include: polystyrene sulfonic acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polypropylene sulfonic acid, polymethacryl sulfonic acid, poly (2 -Acrylamido-2-methylpropanesulfonic acid), polyisoprene sulfonic acid, polysulfoethyl methacrylate, poly(4-sulfobutyl methacrylate), polymethallyl Oxybenzene sulfonic acid, polyvinyl carboxylic acid, polystyrene carboxylic acid, polyallyl carboxylic acid, polyacrylic acid, polymethacrylic acid, poly(2-acrylamide -2-methylpropane carboxylic acid), polyisoprene carboxylic acid, polyacrylic acid, polysulfonated phenylacetylene, etc. It may be a homopolymer of the same, or a copolymer of two or more kinds. Among them, polystyrene sulfonic acid (PSS) is preferred.

The weight average molecular weight (Mw) of the above-mentioned polyanions is preferably 10 to 1 million, more preferably 20 to 500,000. When Mw is within the above range, It has excellent doping and dispersibility in polythiophenes, so it is preferred.

As a commercial product of the above-mentioned polythiophenes doped with polyanions, for example, there can be exemplified: The brand name "Bytron P" manufactured by Bayer, the brand name "Seplegyda" manufactured by Shin-Etsu Polymer Co., the brand name "VERAZOL" manufactured by Soken Chemical Co., the brand name "Denatron P-502RG" manufactured by Nagase Kasei Co., Ltd., and the like. Among them, compared with the case of using an antistatic component in the adhesive layer constituting the surface protection film for polarizing plates, when PEDOT/PSS is used in the antistatic layer constituting the polarizing plate, the generation of pollution can be suppressed and the pollution is resistant It has excellent properties. In addition, since PEDOT/PSS is a conductive polymer, it is a preferable method to obtain an antistatic layer with excellent flexibility and durability.

In the antistatic agent composition, it is preferable that the mixing ratio (weight ratio) of the polyaniline sulfonic acid and the polythiophene doped with polyanions (the polyaniline sulfonic acid: the polyanion doped poly Thiophenes) are 90:10-10:90, more preferably 85:15-15:85, and still more preferably 80:20-20:80. When the blending ratio is within the above range, the surface resistance value can be suppressed to be low, and the stability of the surface resistance value in a high-temperature environment is particularly excellent, which is a preferred aspect. It should be noted that when the content of the polyaniline sulfonic acid is small, or the content of the polythiophene doped with polyanions is small, the surface resistance value in a high-temperature environment tends to increase, which is undesirable.

<Binder>

The aforementioned antistatic layer may contain binder components, and there may be no special restrictions. In order to provide solvent resistance, mechanical strength, charging characteristics, and thermal stability, it is preferably an antistatic layer formed of an antistatic agent composition containing a polyester resin as a binder. The above-mentioned polyester resin is preferably a resin material containing polyester as a main component (typically a component that accounts for more than 50% by weight, preferably 75% by weight or more, for example, 90% by weight or more). The above-mentioned polyester is typically preferably selected from polycarboxylic acids having two or more carboxyl groups in one molecule (typically dicarboxylic acids) and derivatives thereof (anhydrides, esters, halides, etc. of the polycarboxylic acids) One or two or more compounds (polycarboxylic acid components) and one or two or more compounds (polyol components) selected from polyols (typically glycols) having two or more hydroxyl groups in one molecule The structure obtained by condensation.

Examples of compounds that can be used as the above-mentioned polycarboxylic acid components include: oxalic acid, malonic acid, difluoromalonic acid, alkylmalonic acid, succinic acid, tetrafluorosuccinic acid, alkylsuccinic acid, (±)-malic acid, mesotartaric acid, itaconic acid, maleic acid, methylmaleic acid, fumaric acid, methylfumaric acid, acetylene dicarboxylic acid, glutaric acid, hexafluoroglutaric acid, Methylglutaric acid, glutenedioic acid, adipic acid, dithioadipic acid, methyl adipic acid, dimethyl adipic acid, tetramethyl adipic acid, methylene adipic acid, viscose Conic acid, galactaric acid, pimelic acid, suberic acid, perfluoro suberic acid, 3,3,6,6-tetramethyl suberic acid, azelaic acid, sebacic acid, perfluorosebacic acid Aliphatic dicarboxylic acids such as, brazil acid, dodecyl dicarboxylic acid, tridecyl dicarboxylic acid, tetradecyl dicarboxylic acid; cycloalkyl dicarboxylic acid (for example, 1,4-cyclohexane dicarboxylic acid , 1,2-cyclohexane dicarboxylic acid), 1,4-(2-norbornene) dicarboxylic acid, 5-norbornene-2,3-dicarboxylic acid (Nadic acid), adamantane dicarboxylic acid, spiro Heptane II Alicyclic dicarboxylic acids such as formic acid; phthalic acid, isophthalic acid, dithioisophthalic acid, methyl isophthalic acid, dimethyl isophthalic acid, chloroisophthalic acid, Dichloroisophthalic acid, terephthalic acid, methyl terephthalic acid, dimethyl terephthalic acid, chloroterephthalic acid, bromoterephthalic acid, naphthalenedicarboxylic acid, oxofluorene Formic acid, anthracene dicarboxylic acid, diphthalic acid, biphenylenedicarboxylic acid, dimethyl diphenylenedicarboxylic acid, 4,4"-terphenylene dicarboxylic acid, 4,4"-terephthalic acid, Dibenzyl dicarboxylic acid, azophthalic acid, homophthalic acid, phenylene diacetic acid, phenylene dipropionic acid, naphthalenedicarboxylic acid, naphthalenedipropionic acid, biphenyl diacetic acid, biphenyl dipropionic acid, 3 ,3'-[4,4'-(methylenebis-p-biphenylene) dipropionic acid, 4,4'-bibenzyl diacetic acid, 3,3'(4,4'-bibenzyl) dipropylene Aromatic dicarboxylic acids such as acids and oxydi-p-phenylene diacetic acid; anhydrides of any of the above-mentioned polycarboxylic acids; esters of any of the above-mentioned polycarboxylic acids (for example, alkyl esters. It can be mono-ester or diester) Etc.); A halides corresponding to any of the above-mentioned polycarboxylic acids (for example, dimethyl chloride); etc.

Preferred examples of compounds that can be used as the above-mentioned polycarboxylic acid component include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid and their anhydrides; adipic acid, decanoic acid, etc. Aliphatic dicarboxylic acids such as diacid, azelaic acid, succinic acid, fumaric acid, maleic acid, nadic acid, and 1,4-cyclohexanedicarboxylic acid and their anhydrides; and lower grades of the above-mentioned dicarboxylic acids Alkyl esters (for example, esters formed with monohydric alcohols having 1 to 3 carbon atoms) and the like.

On the other hand, examples of compounds that can be used as the above-mentioned polyol component include: ethylene glycol, propylene glycol, 1,2-propane Glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl Pentylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, 2,2-diethyl Diols such as 1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, benzenedimethanol, hydrogenated bisphenol A, and bisphenol A. As other examples, alkylene oxide adducts of these compounds (for example, ethylene oxide adducts, propylene oxide adducts, etc.) can be cited.

The molecular weight of the above-mentioned polyester resin can be, for example, about 5×10 ³ to about 1.5×10 ⁵ (preferably about 1 ×10 ⁴ ~ about 6×10 ⁴ ). In addition, the glass transition temperature (Tg) of the polyester resin may be, for example, 0°C to 120°C (preferably 10°C to 80°C).

Examples of commercially available products of the above-mentioned polyester resins include: VYLONAL MD-1100, MD-1200, MD-1245, MD-1335, MD-1480, MD-1500, MD-1930 manufactured by Toyobo Co., Ltd. , MD-1985, MD-2000, trade name Plascoat Z-221, Z-446, Z-561, Z-565, Z-880, Z-3310, RZ-105, RZ-570 manufactured by Inter-Chemical Industry Company , Z-730, Z-760, Z-592, Z-687, Z-690, PESRESIN A-110, A-120, A-124GP, A-125S, A-160P, A-520 manufactured by Takamatsu Oil , A-613D, A-615GE, A-640, A-645GH, A-647GEX, A-680, A-684G, WAC-14, WAC-17XC, etc.

Regarding the above-mentioned antistatic layer, within the limit of not significantly impairing the performance (for example, antistatic properties, etc.) of the polarizing plate disclosed herein, it may be Use resins other than polyester resins in combination (for example, selected from acrylic resins, acrylic-polyurethane resins, acrylic-styrene resins, acrylic-polysiloxane resins, polysiloxane resins, and polysiloxane resins). One or two or more of alkane resins, fluororesins, styrene resins, alkyd resins, polyurethane resins, amide resins, polyolefin resins, etc.) are used as binders. In the case of using the above resins in combination, it is preferable that the proportion of the polyester resin in the adhesive is 51% by weight to 100% by weight of the antistatic layer. The proportion of the binder in the entire antistatic layer can be set to, for example, 50% by weight to 95% by weight, and it is generally appropriate to set it to 60% by weight to 90% by weight.

<Lubricant>

With regard to the preferred method of the antistatic agent composition used in the formation of the antistatic layer in the technology disclosed herein, it is to use a lubricant selected from the group consisting of fatty acid amides, fatty acid esters, polysiloxanes, and A fluorine lubricant and a wax lubricant constitute at least one of the group as the lubricant. By using the above-mentioned lubricant, even if the surface of the antistatic layer is not subjected to further peeling treatment (for example, coating with a known peeling treatment agent such as polysiloxane-based release agent, long-chain alkyl-based release agent, etc., and then dried In the method of treatment), an antistatic layer that has both sufficient lubricity and printing adhesion can be obtained, so it can be a better method. Regarding the method in which no further peeling treatment is performed on the surface of the antistatic layer, it is possible to prevent whitening caused by the peeling treatment agent (for example, whitening due to storage under heating and humidifying conditions), etc. Is better. In addition, it is also advantageous from the viewpoint of solvent resistance.

As specific examples of the above-mentioned fatty acid amides, one can list Examples: amide laurate, amide palmitate, amide stearate, amide behenate, amide hydroxystearate, amide oleate, amide erucate, N-oleyl palmitate amide , N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, hydroxymethyl stearic acid amide Amine, methylenebisstearate, ethylenebiscaprate, ethylenebislaurate, ethylenebisstearate, ethylenebishydroxystearate , Ethylene bisbehenate amide, hexamethylene bisbehenate amide, hexamethylene bisbehenate amide, hexamethylene hydroxystearate amide, N,N'-di Stearyl adipic acid amide, N,N'-distearyl sebacic acid amide, ethylene bis oleic acid amide, ethylene bis erucic acid amide, hexamethylene bis oleic acid amide Amine, N,N'-dioleyl adipamide, N,N'-dioleyl sebacate amide, m-xylylene bisstearate amide, m-xylylene dimethylene Dihydroxystearic acid amide, N,N'-stearyl isophthalic acid amide, etc. One kind of these lubricants may be used alone, or two or more kinds may be used in combination.

Specific examples of the above fatty acid esters include: polyoxyethylene bisphenol A laurate, butyl stearate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, glycerin Monobehenate, cetyl 2-ethylhexanoate, isopropyl myristate, isopropyl palmitate, cholesteryl isostearate, lauryl methacrylate, coconut fatty acid methyl ester , Methyl laurate, methyl oleate, methyl stearate, myristyl myristate, octyl dodecyl myristate, pentaerythritol monooleate, pentaerythritol monostearate, pentaerythritol tetrapalm Ester, stearyl stearate, isotridecyl stearate, glycerol tri-2-ethylhexanoate, butyl laurate, octyl oleate, etc. These lubricants can be used alone or in combination Use two or more.

As specific examples of the above-mentioned polysiloxane-based lubricants, polydimethylsiloxane, polyether-modified polydimethylsiloxane, amino-modified polydimethylsiloxane, Epoxy modified polydimethylsiloxane, methanol modified polydimethylsiloxane, mercapto modified polydimethylsiloxane, carboxyl modified polydimethylsiloxane, methyl hydrogen polysiloxane Oxyane, methacrylic modified polydimethylsiloxane, phenol modified polydimethylsiloxane, silanol modified polydimethylsiloxane, aralkyl modified polydimethylsiloxane Alkyl, fluoroalkyl modified polydimethylsiloxane, long-chain alkyl modified polydimethylsiloxane, higher fatty acid modified ester modified polydimethylsiloxane, higher fatty acid amide modified Polydimethylsiloxane, phenyl modified polydimethylsiloxane, etc. One kind of these lubricants may be used alone, or two or more kinds may be used in combination.

Specific examples of the above-mentioned fluorine-containing lubricant include perfluoroalkanes, perfluorocarboxylic acid esters, fluorinated block copolymers, and polyether polymers having fluoroalkyl groups. One kind of these lubricants may be used alone, or two or more kinds may be used in combination.

Specific examples of the wax-based lubricants include petroleum waxes (paraffin wax, etc.), vegetable waxes (carnauba wax, etc.), mineral waxes (montan wax, etc.), higher fatty acids (ceramic acid, etc.) , Neutral fats (glyceryl tripalmitate, etc.) and other waxes. One kind of these lubricants may be used alone, or two or more kinds may be used in combination.

The ratio of the lubricant in the entire antistatic layer can be set to 1% by weight to 50% by weight, and it is usually appropriate to set it to 5% to 40% by weight. When the content of lubricant is too small, it will have lubricity. The tendency to decrease easily. If the content of the lubricant is too high, the printing adhesion and back peeling strength (adhesive strength) may decrease.

The antistatic agent composition forming the antistatic layer preferably contains at least one selected from the group consisting of a silane coupling agent, an epoxy crosslinking agent, a melamine crosslinking agent, and an isocyanate crosslinking agent as a crosslinking agent. Among them, the use of the above-mentioned melamine-based cross-linking agent and/or isocyanate-based cross-linking agent is particularly preferable. When the antistatic layer is formed, conductive polymer components (for example, polyaniline sulfonic acid, polythiophenes doped with polyanions) can be fixed in the binder, which has excellent water resistance and solvent resistance, and can improve printing Adhesion and other effects. In particular, by using a melamine-based crosslinking agent, water resistance and solvent resistance are improved, and by using an isocyanate-based crosslinking agent, water resistance and printing adhesion are improved. By using these crosslinking agents together, water resistance and solvent resistance are improved. It is useful to improve solvent properties and printing adhesion.

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

In addition, as the above-mentioned isocyanate-based crosslinking agent, a preferred aspect is to use a blocked isocyanate-based crosslinking agent that is stable in an aqueous solution. As specific examples of the above-mentioned blocked isocyanate-based crosslinking agent, alcohols, phenols, thiophenols, amines, imines, oximes, endoamides, and active methylene groups can be used. Compounds, mercaptans, imines, ureas, diaryl compounds, sodium bisulfite, etc. are obtained by blocking isocyanate crosslinking agents that can be used when preparing ordinary adhesive layers and antistatic layers Of the substance.

The antistatic layer in the technology disclosed herein may contain antistatic agents, antioxidants, colorants (pigments, dyes, etc.), fluidity regulators (thixotropic agents, thickeners, etc.), film forming aids, Surfactants (defoamers, etc.), preservatives and other additives. In addition, a glycidyl compound, a polar solvent, a polyvalent aliphatic alcohol, a lactam compound, etc. may be contained as a conductivity improver.

<Formation of Antistatic Layer>

The above-mentioned antistatic layer can be obtained by including on a substrate (protective film for polarizers, dissolving or dispersing additives used in accordance with the above-mentioned conductive polymer components, etc.) in an appropriate solvent (water, etc.) to obtain a liquid composition ( The coating material for forming the antistatic layer, the antistatic agent composition) can be appropriately formed. For example, the following method can be preferably used: the coating material is applied to the substrate (protective film for polarizer). The surface is dried, and curing treatment (heat treatment, ultraviolet treatment, etc.) is carried out as necessary. The NV (non-volatile component) of the above-mentioned coating material can be set to 5 wt% or less (typically 0.05 wt% to 5 wt%). ), usually set to 1% by weight or less (typically 0.10% by weight to 1% by weight) is appropriate. In the case of forming an antistatic layer with a small thickness, it is preferable to set the NV of the coating material to, for example, 0.05% by weight to 0.50% by weight (for example, 0.10% by weight to 0.40% by weight). By using such a low NV coating material, a more uniform antistatic layer can be formed.

As the solvent constituting the coating material for forming the antistatic layer, a solvent capable of stably dissolving or dispersing the forming component of the antistatic layer is preferable. The solvent can be an organic solvent, water, or the like Mixed solvents. As the above-mentioned organic solvent, for example, esters selected from ethyl acetate; ketones such as methyl ethyl ketone, acetone, and cyclohexanone; cyclic ethers such as tetrahydrofuran (THF) and dioxane; n-hexane and cyclohexane can be used. Aliphatic or alicyclic hydrocarbons; aromatic hydrocarbons such as toluene and xylene; aliphatic or alicyclic alcohols such as methanol, ethanol, n-propanol, isopropanol, and cyclohexanol; alkylene glycols One or two or more of glycol ethers such as monoalkyl ether (for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether), dialkylene glycol monoalkyl ether, and the like. In a preferred embodiment, the solvent of the coating material is water or a mixed solvent containing water as a main component (for example, a mixed solvent of water and ethanol).

In addition, in order to improve the dispersion stability in the solvent, it may contain a basic organic compound capable of coordinating or bonding with the anionic group of the polyanion in the form of an ion pair. Examples of basic organic compounds include well-known amine compounds, hydrochlorides of amine compounds, cationic emulsifiers, and basic resins.

Specific examples of the above-mentioned basic organic compounds include: methyloctylamine, methylbenzylamine, N-methylaniline, dimethylamine, diethylamine, diethanolamine, N-methylethanolamine, and di-n-propylamine , Diisopropylamine, methyl-isopropanolamine, dibutylamine, di-2-ethylhexylamine, aminoethylethanolamine, 3-amino-1-propanol, isopropylamine, monoethylamine, 2 -Ethylhexylamine, 3rd butylamine, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-amine Trimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethyl Amine compounds such as oxysilane, N-phenyl-3-aminopropyltrimethoxysilane, monomethylamine, monoethylamine, stearylamine and other primary amine hydrochlorides, Hydrochloride of secondary amines such as dimethylamine, diethylamine and distearylamine, hydrochloride of tertiary amines such as trimethylamine, triethylamine, and stearyl dimethylamine, stearyl trimethyl Ammonium chloride, distearyl dimethyl ammonium chloride, stearyl dimethyl benzyl ammonium chloride and other quaternary ammonium salts, monoethanolamine, diethanolamine, triethanolamine and other ethanolamine hydrochloride, ethylene dichloride Hydrochlorides of polyethylene polyamines such as amines and diethylene triamine.

As said cationic emulsifier, specifically, an alkylammonium salt, an alkylamidobetaine, an alkyldimethylamine oxide, etc. are mentioned.

As a specific example of the said basic resin, the basic resin containing a polyester-based, acrylic-based, and polyurethane-based polymer copolymer and having a weight average molecular weight (Mw) of 10 to 1 million can be cited. When the weight average molecular weight of the basic resin is less than 1,000, sufficient steric hindrance cannot be obtained, and the dispersion effect may be reduced. When the weight average molecular weight is more than 1 million, agglomeration may occur instead.

In addition, the amine value of the basic resin is preferably 5 mgKOH/g to 200 mgKOH/g. When it is less than 5 mgKOH/g, the interaction with the polyanions doped in the polythiophenes is likely to become insufficient, and a sufficient dispersion effect may not be obtained in some cases. On the other hand, when the amine value of the basic resin exceeds 200 mgKOH/g, the steric hindrance layer is reduced compared to the part that is compatible with the polyanion doped in the polythiophene, and the dispersion effect may be insufficient.

As the above-mentioned basic resin, for example, Solsperse 17000, Solsperse 20000, Solsperse 24000, Solsperse 32000 (manufactured by Zeneca Co., Ltd.), Disperbyk-160, Disperbyk-161, Disperbyk-162, Disperbyk-163, Disperbyk-170, Disperbyk-2000, Disperbyk-2001 (manufactured by BYK Chemie), AJISPER PB711, AJISPER PB821 , AJISPER PB822, AJISPER PB824 (manufactured by Ajinomoto Co., Ltd.), EPOMIN 006, EPOMIN 012, EPOMIN 018 (manufactured by Nippon Shokubai Co., Ltd.), EFKA 4046, EFKA 4300, EFKA 4330, EFKA 4510 (manufactured by EFKA) , DISPARLON DA-400N (manufactured by Kusumoto Chemical Co., Ltd.), etc., can be used alone or in combination. In particular, in terms of dispersibility and conductivity during use, AJISPER PB821, AJISPER PB822, and AJISPER PB824 are preferred.

The content of the basic compound is not limited, and it can be preferably in the range of 1 part by weight to 100,000 parts by weight, more preferably in the range of 10 parts by weight to 10,000 parts by weight relative to 100 parts by weight of the total of polythiophenes and polyanions. Added within.

<Properties of Antistatic Layer>

)增大)，因此，有可能容易在偏光板的外觀上產生不均。另一方面，防靜電層過厚時，有時對偏光板的特性(光學特性、尺寸穩定性等)帶來影響。 The thickness of the antistatic layer (after heating and stretching) is preferably 100 nm or less, more preferably 3 nm to 100 nm, and still more preferably 20 nm to 80 nm. If the thickness of the anti-static layer is too small, it is difficult to form the anti-static layer uniformly (for example, for the thickness of the anti-static layer, depending on the deviation of the thickness of the position (

) Increases), therefore, there is a possibility that unevenness may easily occur in the appearance of the polarizing plate. On the other hand, when the antistatic layer is too thick, it may affect the characteristics (optical characteristics, dimensional stability, etc.) of the polarizing plate.

The surface resistance value (Ω/□) measured at the surface of the antistatic layer is preferably 1.0×10 ⁸ or less, more preferably 1.0×10 ⁴ to 1.0×10 ⁸ , and still more preferably 1.0×10 ⁶ to 1.0 ×10 ⁷ . The polarizing plate showing the surface resistance value in the above range can suppress the electrification of the surface protective film for the polarizing plate caused by the frictional electrification generated in the processing process and the transportation process, can prevent the suction of dust or prevent the workability from being reduced, and can be preferably used . It should be noted that the above-mentioned surface resistance value can be calculated from the surface resistance value measured by a commercially available insulation resistance measuring device in an atmosphere with a temperature of 23° C. and a humidity of 50% RH.

<First Adhesive Layer>

A polarizing plate having a configuration in which a first adhesive layer is laminated on at least one surface of the above-mentioned polarizing plate can be used, and other optical members (e.g., phase difference Film, liquid crystal display device, etc.) etc. (see Figure 2). An appropriate adhesive (adhesive composition) can be used for the first adhesive layer, and the kind thereof is not particularly limited. Examples of adhesives include: rubber adhesives, acrylic adhesives, silicone adhesives, polyurethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyethylene Pyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, etc. Among these adhesives (adhesive compositions), it is preferable to use an adhesive that is excellent in optical transparency, exhibits suitable adhesive properties such as wettability, cohesiveness, and tackiness, and is excellent in weather resistance, heat resistance, and the like. As the adhesive exhibiting such characteristics, an acrylic adhesive is preferably used.

As a method of forming the first adhesive layer, for example, It is produced by a method such as: applying the above-mentioned adhesive (adhesive composition) to the separator after the peeling treatment, and drying and removing the polymerization solvent, etc., to form an adhesive layer, and then transferring to a polarizing plate; or The above-mentioned adhesive is applied to the polarizing plate, and the polymerization solvent and the like are dried and removed, thereby forming an adhesive layer on the polarizing member. It should be noted that when applying the adhesive, one or more solvents other than the polymerization solvent may be newly added as appropriate. As the separator after the peeling treatment, a polysiloxane separator is preferably used.

In the process of applying the above-mentioned adhesive (adhesive composition) to such a separator and drying to form an adhesive layer, as a method of drying the adhesive, an appropriate method can be appropriately adopted according to the purpose. It is preferable to use a method of heating and drying the above-mentioned coating film. The heating and drying temperature is preferably 40°C to 200°C, more preferably 50°C to 180°C, particularly preferably 70°C to 170°C. By setting the heating temperature to the above range, an adhesive layer having excellent adhesive properties can be obtained.

As a method of forming the adhesive layer, various methods can be used. Specifically, examples include: roll coating, roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, and air knife coating. Method, curtain coating method, lip die coating method, extrusion coating method using die coater, etc.

The thickness of the first adhesive layer is preferably 2 μm to 50 μm, more preferably 2 μm to 40 μm, and still more preferably 5 μm to 35 μm.

The separator can protect the first adhesive layer until it is put into practical use. As the constituent material of the separator, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester film can be cited; Porous materials such as paper, cloth, and non-woven fabric; appropriate thin paper (thin leaf) such as mesh, foam sheet, metal foil, and laminates thereof, etc., from the viewpoint of excellent surface smoothness, it is more It is better to use plastic film. The plastic film is not particularly limited as long as it is a film that can protect the adhesive layer. Examples include polyethylene film, polypropylene film, polybutene film, polybutadiene film, and polymethylpentene. Film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, etc.

The separator can also be subjected to mold release and antifouling treatment, or coating, using polysiloxane, fluorine-containing, long-chain alkyl, or fatty acid amide-based mold release agents, or silica powder, as needed. Anti-static treatment such as type, kneading type, vapor deposition type, etc. In particular, by appropriately subjecting the surface of the release film to a release treatment such as polysiloxane treatment, long-chain alkyl treatment, fluorine treatment, etc., the releasability from the first adhesive layer can be further improved.

The thickness of the separator is generally preferably 5 μm to 50 μm, and more preferably 15 μm to 40 μm.

The polarizing plate disclosed herein may also include other layers in addition to the antistatic layer, the protective film for polarizers, the polarizer, and the intermediate layer (interlayer) (adhesive layer, first adhesive layer, etc.) Implement.

<Polarizing plate with surface protective film for polarizing plate>

The polarizing plate with a surface protective film of the present invention is characterized in that, with respect to the polarizing plate and the surface protective film for polarizing plates, the surface protective film for polarizing plates is laminated via an adhesive layer of the surface protective film for polarizing plates On the anti-static layer of the above-mentioned polarizing plate. Attached surface of the present invention The polarizing plate of the protective film has a specific structure (layering order). When the polarizing plate is laminated (adhered) on a liquid crystal display device (LCD), etc., the surface of the polarizing plate is peeled off to form the surface of the polarizing plate. Since the antistatic layer of the protective film and the antistatic layer constituting the polarizing plate are in a specific position (laminating order), it is possible to prevent whitening of panels of liquid crystal display devices and breakage of labels, and is useful because of its excellent peeling and charging resistance. In addition, since the adhesive layer does not use an antistatic component and is excellent in stain resistance, having the antistatic layer constituting the polarizing plate has excellent flexibility and durability (scratch resistance) and is useful.

Example

Hereinafter, several embodiments related to the present invention will be described, but it is not intended to limit the present invention to the content shown by the specific examples. It should be noted that, unless otherwise specified, "parts" and "%" in the following descriptions are based on weight. In addition, the compounding amount (addition amount) in the table is shown.

In addition, each characteristic in the following description was measured or evaluated as follows, respectively. In addition, about the preparation method of the polarizing plate described below, the surface protective film for polarizing plates, and the polarizing plate with the surface protective film for polarizing plates, they were prepared based on the structure, positional relationship, etc. described in Table 1.

<Preparation of protective film for polarizers>

Acrylic resin (trade name: Acrypet VH, Tg: 113°C, manufactured by Mitsubishi Rayon Co., Ltd.) was vacuum dried at 100°C to degas moisture and residual oxygen. Acrylic rubber (trade name: AR12, Japan Zeon Co., Ltd.) 30 parts by weight, and the mixture thus obtained was supplied to a twin-screw extruder (device name: TEM35B, manufactured by Toshiba Machine Co., Ltd.) that was replaced with nitrogen in the range from the raw material hopper to the extruder , Melt at the set temperature of the barrel at 230°C~270°C, and granulate to obtain raw material pellets. The obtained raw material pellets were vacuum dried at 100°C and supplied to a single-screw extruder (device name: SE-65, Toshiba Machine Co., Ltd.) which was replaced with nitrogen in the range from the raw material hopper to the extruder Manufacturing), the barrel is melted at a set temperature of 230°C to 270°C and is cooled by a coat hanger-type T mold with a chrome-plated casting roll at 120°C and a cooling chrome-plated casting roll at 90°C. The film winding device obtained an acrylic resin film (thickness: 40 μm) as a protective film for a polarizer.

<Preparation of protective film for polarizer with antistatic layer (polymer type)>

Use wire rod #6 to coat Denatron P-502RG (including PEDOT/PSS) manufactured by Nagase Kasei Co., Ltd. as an antistatic agent composition on the acrylic resin film (thickness: 40 μm) as a protective film for polarizers, and then It was dried at 120°C for 60 seconds to produce a protective film for a polarizer with an antistatic layer (thickness of the antistatic layer: 80 nm). The surface resistance value of the surface of the obtained antistatic layer was 3.12×10 ⁶ Ω/□.

<Preparation of protective film for polarizer with antistatic layer (metal type)>

Use wire rod #6 to coat the above-mentioned acrylic resin film (thickness: 40μm) as the protective film for polarizers as an antistatic agent composition with tin oxide S-1 manufactured by Mitsubishi Material Electronics Co., Ltd. After drying at ℃ for 60 seconds, a protective film for a polarizer with an antistatic layer (thickness of the antistatic layer: 80 nm) was produced. The surface resistance value of the surface of the obtained antistatic layer was 1.21×10 ⁶ Ω/□.

<Production of Polarizing Parts>

A polyvinyl alcohol film with a thickness of 75μm (degree of polymerization: 2300, degree of saponification: 99.9%, width: 1000mm, thickness: 75μm, manufactured by Kuraray Co., Ltd.: VF-PS7500) is immersed in pure water at 30°C. Stretching for 60 seconds to a stretching ratio of 2.5 times.

Next, dyeing was performed in an iodine aqueous solution (weight ratio: pure water/iodine (I)/potassium iodide (KI)=100/0.01/1) at 30°C for 45 seconds.

Then, stretching was performed in a 4% by weight boric acid aqueous solution so that the stretching ratio was 5.8 times. After stretching, it was immersed in pure water for 10 seconds, and then dried at 50° C. for 3 minutes while maintaining the tension of the film, thereby obtaining a polarizer. The thickness of this polarizer was 25 μm, and the moisture content was 14% by weight.

<Preparation of Adhesive Aqueous Solution>

100 parts by weight of polyvinyl alcohol resin containing acetyl acetyl group (average degree of polymerization: 1200, saponification degree: 98.5 mol%, acetyl acetyl group modification degree: 5 mol%), methylol melamine 50 parts by weight were dissolved in pure water (water temperature: 30°C) to prepare an aqueous solution whose solid content concentration was adjusted to 3.7% by weight. 18 weight parts of alumina colloid aqueous solution (average particle diameter: 15 nm, solid content concentration: 10 weight%, positive charge) were added with respect to 100 weight part of said aqueous solutions, and the adhesive aqueous solution was prepared. The viscosity of the adhesive aqueous solution is 9.6mPa‧s. The pH of the adhesive aqueous solution is in the range of 4 to 4.5. will It is used as an aqueous adhesive solution.

<Laminating the antistatic layer of the polarizing plate on the adhesive layer side of the surface protective film for polarizing plate (surface protective film side for polarizing plate)>

On the surface of the polarizer protective film with the antistatic layer on the opposite side of the antistatic layer, the adhesive aqueous solution was applied so that the thickness of the dried adhesive layer was about 55nm, and the adhesive A protective film for polarizing parts of the adhesive layer.

Then, under the temperature condition of 23°C, the adhesive layer with the adhesive layer was polarized by a roller so that the adhesive layer of the protective film for the polarizer with the adhesive layer was in contact with the polarizer. The protective film for the material was bonded to one side of the above-mentioned polarizing material to obtain a laminate. The laminate was dried at 70°C for 10 minutes to produce a polarizing plate (1).

<The polarizer (the polarizer side) of the polarizing plate laminated on the adhesive layer side of the surface protection film for polarizing plates>

On the surface of the antistatic layer of the polarizer protective film with the antistatic layer, the adhesive aqueous solution was coated so that the thickness of the dried adhesive layer was about 55nm to produce the adhesive The protective film of the agent layer.

Then, under the temperature condition of 23°C, the adhesive layer with the adhesive layer was polarized by a roller so that the adhesive layer of the protective film for the polarizer with the adhesive layer was in contact with the polarizer. The protective film for the material was bonded to one side of the above-mentioned polarizing material to obtain a laminate. The laminate was dried at 70°C for 10 minutes to produce a polarizing plate (2).

<A protective film for a polarizer of a polarizer without an antistatic layer is laminated on the adhesive layer side of the surface protective film for a polarizer Preparation of polarizing plate>

Regarding the protective film for polarizers with an antistatic layer of the above-mentioned polarizing plate (1), on one side of the protective film for polarizers without an antistatic layer, the thickness of the adhesive layer after drying is about The above-mentioned adhesive aqueous solution was applied at 55 nm to produce a protective film for polarizers with an adhesive layer.

Then, under the temperature condition of 23°C, the polarizer with the adhesive layer was made by a roller so that the adhesive layer of the protective film for the polarizer with the adhesive layer was in contact with the polarizer. It was bonded to one side of the above-mentioned polarizer with a protective film to obtain a laminate. The laminate was dried at 70°C for 10 minutes to produce a polarizing plate (3).

<Surface protective film for polarizing plate used>

<E-MASK RP207>

As the surface protection film for polarizing plates, the brand name "E-MASK RP207" manufactured by Nitto Denko Co., Ltd. having the configuration described in Table 1 was used.

<AS3-830>

As the surface protection film for polarizing plates, the brand name "AS3-830" manufactured by Fujimori Industrial Co., Ltd. having the configuration described in Table 1 was used.

<NSA35-H>

As a surface protection film for a polarizing plate, the brand name "Sunytect NSA35-H" manufactured by San-A Kaken Co., Ltd. having the configuration described in Table 1 was used.

<Production of polarizing plate with surface protective film for polarizing plate Make>

The surface of the adhesive layer of the above-mentioned polarizing plate surface protection film is attached to the exposed surface of the antistatic layer of the polarizing plate (1) prepared above, or the exposed surface of the polarizer of the above-mentioned polarizing plate (2), or the above On the exposed surface of the polarizer protective film of the polarizing plate (3) without an antistatic layer, it was left at room temperature for 5 minutes to produce a polarizing plate with a surface protective film for polarizing plate.

<Measurement of the surface resistance value of the surface of the antistatic layer of the polarizing plate>

In an atmosphere with a temperature of 23° C. and a humidity of 50% RH, the measurement was performed with a resistivity meter (manufactured by Mitsubishi Chemical Analytic, Hiresta UP MCP-HT450 type) in accordance with JIS-K-6911. The applied voltage was set to 100V, and the reading of the surface resistance value was performed 10 seconds after the start of the measurement.

In addition, the surface resistance value (Ω/□) measured on the surface of the antistatic layer of the polarizing plate was performed in a state where the antistatic agent composition (solution) was applied to the base film and dried to form an antistatic layer. Determination.

It should be noted that the surface resistance value (Ω/□) measured on the surface of the antistatic layer in the present invention is preferably 1.0×10 ⁸ or less, more preferably 1.0×10 ⁴ to 1.0×10 ⁸ , and still more preferably It is 1.0×10 ⁶ ~1.0×10 ⁷ . A surface protective film for polarizing plates having an antistatic layer showing a surface resistance value within the above-mentioned range can be suitably used as a surface protective film used in the processing or transportation of static-resistant articles such as liquid crystal cells and semiconductor devices, for example. .

<Measurement of peeling electrification voltage (anti-peeling electrification)>

As shown in Figure 3, the polarizing plate surface protection film 2 of each example was cut into a size of 70 mm in width and 130 mm in length. The resin plate 31 (manufactured by Mitsubishi Rayon, trade name "ACRYLITE", thickness: 1mm, width: 70mm, length: 100mm) of each example of polarizing plate 3 (width: 70mm, length: 100mm) surface, so that the polarizing plate The end of the surface protection film 2 protruded 30 mm from the end of the polarizing plate 20, and pressure-bonded with a hand roller via an adhesive layer to obtain a sample.

The sample was left in an environment of 23° C.×50% RH for 1 day, and then set at a predetermined position of a sample fixing table 30 with a height of 20 mm. The end of the surface protection film 1 protruding 30 mm from the polarizing plate 3 was fixed to an automatic winder (not shown), and peeled so that the peeling angle was 150° and the peeling speed was 30 m/min. The potential on the surface of the adherend (polarizing plate) generated at this time was measured by a potential measuring instrument 32 (manufactured by Kasuga Electric Co., Ltd., model "KSD-0103") fixed at a height of 100 mm from the center of the polarizing plate 20 as peeling Live voltage. The measurement was performed under an environment of 23°C and 50% RH. In addition, when the polarizing plate does not have an antistatic layer, instead of the surface of the antistatic layer, the potential of the surface of the protective film for polarizers is measured as the peeling charging voltage.

In addition, the peeling charging voltage means the peeling charging voltage mainly derived from the antistatic layer which comprises the surface protection film for polarizing plates of this invention, and it contributes to the peeling charging prevention property.

As the peeling charging voltage (absolute value) of the surface protective film for polarizing plates of the present invention, it is preferably 0.4 kV or less, more preferably Below 0.3kV. When the stripping charging voltage exceeds 0.4 kV, the polarizer array in the polarizing plate is disturbed, so it is undesirable. In addition, as the evaluation in Table 1, the case of 0.4 kV or less was evaluated as ○ (good), and the case of exceeding 0.4 kV was evaluated as × (poor).

<Fouling resistance>

The surface of the antistatic layer of the polarizing plate was stuck to the surface of the adhesive layer of the surface protection film for polarizing plate, and kept at 70°C for 120 hours, and then it was confirmed by visual inspection that the surface protection film for polarizing plate was peeled at a peeling speed of 30m/min. The presence or absence of contamination on the surface of the polarizing plate after peeling off the polarizing plate. It should be noted that when the surface of the polarizing plate adhered to the surface of the adhesive layer of the polarizing plate surface protection film is not an antistatic layer but a protective film for polarizers, it was confirmed visually that the surface of the protective film for polarizers The presence or absence of pollution.

As an evaluation, the case where no contamination was found was evaluated as ○ (good), and the case where contamination was found was evaluated as × (poor).

<Steel Wool Test (Durability)>

Paste steel wool (#0000, made by Japan Steel Wool Co., Ltd.) on a circular jig with a radius of 25mm, and under the condition of five times back and forth within a length of 10cm with a load of 10g, the surface of the antistatic layer is resistant to scratches Performance (durability) was evaluated. The case where the number of flaws confirmed visually was 10 or less was evaluated as ○ (good), and the case where it exceeded 10 was evaluated as × (poor). In addition, when the surface of the polarizing plate adhered to the surface of the adhesive layer of the surface protection film for polarizing plates is not an antistatic layer, durability evaluation is not performed.

About the surface with polarizing plate of Examples and Comparative Examples For the polarizing plate of the protective film, the contents of the above-mentioned compounding and the results of various measurements and evaluations are shown in Table 1.

In addition, the "surface protection film side for polarizing plates" in Table 1 refers to the case where the exposed surface of the antistatic layer on the side opposite to the polarizer is in contact with the surface of the adhesive layer of the surface protection film for polarizing plates.

The "polarizer side" refers to the case where the exposed surface of the polarizer on the opposite side of the polarizer protective film is in contact with the surface of the adhesive layer of the polarizer surface protective film.

In addition, when the antistatic layer of the polarizing plate does not exist, durability is not evaluated.

From Table 1, it was confirmed that in Example 1, by having an antistatic layer at a specific position of the polarizing plate and the surface protective film for polarizing plate, the anti-peel charging property, stain resistance, and durability (scratch resistance) are excellent.

On the other hand, it is confirmed from Table 1 that in the comparative example, when the position of the antistatic layer constituting the polarizing plate is not in the desired position, the antistatic layer constituting the polarizing plate or the surface protective film for the polarizing plate is not When it exists, the anti-peeling chargeability is poor. In addition, when the position of the antistatic layer constituting the polarizing plate is not in the desired position, the durability is poor. In addition, when the antistatic layer of the metal type antistatic component is used The bottom durability is also poor, and the stain resistance is poor when the adhesive layer constituting the surface protective film for polarizing plates contains an antistatic component.

Industrial applicability

The surface protective film that constitutes the polarizing plate with the surface protective film disclosed herein can be suitably used as a polarizing element for liquid crystal display panels, plasma display panels (PDP), organic electroluminescence (EL) displays, etc. plate.

(none)

Claims (3)

A polarizing plate attached with a surface protective film for a polarizing plate, which has a polarizing plate and a surface protective film for the polarizing plate, the polarizing plate has a polarizing member and a protective film for a polarizing member on at least one side of the polarizing member, and The protective film for polarizers has an antistatic layer formed of an antistatic agent composition containing a conductive polymer on the opposite side of the contact surface of the polarizer, and the surface protective film for polarizers has a substrate film and The base film has a single-sided adhesive layer, and has an antistatic layer on the opposite side of the contact surface of the base film and the adhesive layer, and the polarizing plate with the surface protective film for polarizing plate The surface protective film for polarizing plate is laminated on the antistatic layer of the polarizing plate via the adhesive layer of the surface protective film for polarizing plate, and the adhesive composition forming the adhesive layer contains: (Meth)acrylic polymer acrylic adhesive or polysiloxane polymer containing polysiloxane adhesive, the antistatic layer of the surface protective film for polarizing plate does not contain ionic compounds, and The adhesive composition forming the adhesive layer does not contain an antistatic component. The polarizing plate with a surface protective film for polarizing plate according to claim 1, wherein the protective film for polarizing member is selected from the group consisting of (meth)acrylic resin, cyclic olefin resin, polyester resin and Polycarbonate At least one resin in the resin-like composition group is formed. The polarizing plate with a surface protective film for polarizing plate according to claim 1 or 2, wherein the protective film for polarizing member has an ultraviolet absorbing function.

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