JP2018116243A - Polarizing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical member with a surface protective film for a polarizing plate which can prevent whitening of a panel of a liquid crystal display device or the like and destruction of a tag when the surface protective film for the polarizing plate is peeled after the polarizing plate with the surface protective film for the polarizing plate is stacked on the liquid crystal display device or the like and used, and is excellent in peeling antistatic property, stain resistance and durability.SOLUTION: There is provided a polarizing plate with a surface protective film for a polarizing plate that has: a polarizing plate which has a protective film for a polarizer on at least one surface of a polarizer and an antistatic layer formed of an antistatic composition on an opposite side to a surface in contact with the polarizer of the protective film for the polarizer; and a surface protective film for a polarizing plate which has a base material film, an adhesive layer on one surface of the base material film, and an antistatic layer on an opposite side to a surface in contact with the adhesive layer of the base material film, where the surface protective film for the polarizing plate is stacked on the antistatic layer of the polarizing plate through the adhesive layer of the surface protective film for the polarizing plate.SELECTED DRAWING: None

Description

  The present invention relates to a polarizing plate with a surface protective film for a polarizing plate. In particular, the polarizing plate with a surface protective film can form an image display device such as a liquid crystal display device (LCD), an organic EL display device, a CRT, or a PDP alone or as an optical film obtained by laminating the polarizing plate.

  In liquid crystal display devices and organic EL display devices, for example, in a liquid crystal display device, it is indispensable to dispose a polarizer in a liquid crystal cell, and generally a polarizing plate is attached. Yes.

  For example, in the manufacture of a liquid crystal display panel, a polarizing plate bonded to a liquid crystal cell is an adhesive that constitutes a surface protective film for a polarizing plate in order to prevent scratches and dirt from being generated in processes such as processing and transportation. It is affixed to the polarizing plate surface through the agent layer. However, this surface protection film is peeled off when it is no longer needed. However, when peeling, static electricity is generated, whitening occurs on the liquid crystal panel, and tag destruction occurs. .

  In order to suppress the generation of such static electricity, an antistatic agent such as an alkali metal salt is blended in the pressure-sensitive adhesive layer to try to impart antistatic properties (for example, Patent Document 1).

JP 2009-251281 A

  However, by blending an antistatic agent in the pressure-sensitive adhesive layer as in Patent Document 1, the adhesive force based on the pressure-sensitive adhesive layer becomes insufficient, or the antistatic agent bleeds out and contaminates the polarizing plate surface. As a result, it is difficult to achieve both adhesive properties and stain resistance.

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

  In view of the above circumstances, the present invention has been intensively studied, and as a result, by using a polarizing plate (polarizing plate) with a surface protective film for a polarizing plate having a specific configuration (lamination order), the polarizing plate is used as a liquid crystal display device. When the surface protective film for polarizing plates is peeled off after being laminated (attached), etc., it is possible to prevent whitening of panels such as liquid crystal display devices and destruction of tags, excellent peeling antistatic properties, and contamination resistance And it aims at providing the optical member with the surface protection film for polarizing plates excellent in durability.

  That is, the polarizing plate with a surface protective film of the present invention has a polarizer and a polarizer protective film on at least one surface of the polarizer, and is opposite to the surface in contact with the polarizer of the polarizer protective film. A polarizing plate having an antistatic layer formed of an antistatic agent composition containing a conductive polymer on the side, a base material, and an adhesive layer on one side of the base film; A polarizing plate with a surface protective film for a polarizing plate having a surface protective film for a polarizing plate having an antistatic layer on the side opposite to the surface in contact with the pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer of the surface protective film for a polarizing plate is Thus, the surface protective film for a polarizing plate is laminated on the antistatic layer of the polarizing plate, and the pressure-sensitive adhesive composition forming the pressure-sensitive 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 a polarizer is at least one selected from the group consisting of (meth) acrylic resins, cyclic olefin resins, polyester resins, and polycarbonate resins. It is preferable to be formed of the resin.

  In the polarizing plate with a surface protective film of the present invention, the polarizer protective film preferably has an ultraviolet absorbing function.

  The polarizing plate with a surface protective film for a polarizing plate of the present invention is a surface protective film for a polarizing plate having an antistatic layer, a base film, and an adhesive layer formed of an adhesive composition not containing an antistatic component, And an antistatic layer formed of an antistatic agent composition containing a conductive polymer, a protective film for a polarizer, and a polarizing plate having a polarizer, with the adhesive layer of the surface protective film for a polarizing plate interposed therebetween. By laminating on the antistatic layer of the polarizing plate, it becomes a polarizing plate (polarizing plate) with a surface protective film for polarizing plate having a specific configuration (lamination order), and this polarizing plate is used as a liquid crystal display device (LCD), etc. When the surface protective film for polarizing plate is peeled off after being laminated (attached), the antistatic layer constituting the polarizing plate surface protective film and the antistatic layer constituting the polarizing plate are located at specific positions (laminated In order) It is, it is possible to prevent destruction of the panel whitening and tags, such as a liquid crystal display device), superior peeling antistatic properties, it is useful. Further, by not containing (substantially) an antistatic component in the pressure-sensitive adhesive layer, contamination due to the antistatic component in the pressure-sensitive adhesive layer can be prevented, and the anti-staining property is excellent. By forming the antistatic layer from an antistatic agent composition containing a conductive polymer, it is possible to provide an optical member with a surface protective film for a polarizing plate that is excellent in flexibility and durability (abrasion resistance). Is useful.

It is a typical sectional view showing an example of 1 composition of a polarizing plate with a surface protection film for polarizing plates concerning the present invention. It is a typical sectional view showing an example of 1 composition of a polarizing plate with a surface protection film for polarizing plates concerning the present invention. It is explanatory drawing which shows the measuring method of peeling voltage.

  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 plates disclosed here is, for example, as shown in FIG. 1, the surface protective film 2 for polarizing plate has an adhesive layer 12 on at least one side of the base film 11, and the other side. The antistatic layer 10 is laminated on the surface, and the polarizing plate 3 has a surface in contact with the polarizer protective film 21 on at least one surface of the polarizer 22 and the polarizer protective film 21. And an antistatic layer 20 laminated on the opposite surface. In addition, the polarizing plate surface protective film includes the polarizing plate 1 with a surface protective film for a polarizing plate having a configuration in which the polarizing plate surface protective film is directly laminated (contacted) with the antistatic layer 20 of the polarizing plate 3 through the pressure-sensitive adhesive layer 20. It is done. Moreover, the polarizing plate with the surface protective film for polarizing plates disclosed here may be in the form of a roll or a sheet.

<Base film of surface protective film for polarizing plate>
The surface protective film for polarizing plate used in the present invention has a base film and an adhesive layer on one side of the base film, and is antistatic on the side opposite to the side in contact with the adhesive layer of the base film. It has a layer. In the technology disclosed herein, the resin material constituting the base film can be used without any particular limitation. For example, transparency, mechanical strength, thermal stability, moisture shielding property, isotropic property, It is preferable to use a material excellent in properties such as flexibility and dimensional stability. In particular, since the base film has flexibility, the pressure-sensitive adhesive composition can be applied by a roll coater or the like, and can be wound up into a roll shape, which is useful.

  As the base film (base, support), for example, a polyester-based polymer, a cellulose-based polymer, a polycarbonate-based polymer, an acrylic-based polymer, or the like is a main resin component (the main component of the resin component, typically 50 wt. A plastic film composed of a resin material having a component occupying at least%) can be preferably used as the substrate film. A base film composed of a blend of two or more of these polymers may be used.

  Various additives such as an antioxidant, an ultraviolet absorber, a plasticizer, and a colorant (pigment, dye, etc.) may be blended in the resin material constituting the base film, if necessary. For example, a known or conventional surface treatment such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of a primer may be performed. Such surface treatment can be, for example, a treatment for improving the adhesion between the base film and the pressure-sensitive adhesive layer (the anchoring property of the pressure-sensitive adhesive layer).

  In the surface protective film for polarizing plate used in the present invention, a plastic film subjected to antistatic treatment can also be used as the base film. Use of the substrate film is preferable because charging of the surface protective film for a polarizing plate itself when peeled can be suppressed. In addition, the base film is a plastic film, and by applying antistatic treatment to the plastic film, the surface protection film for the polarizing plate itself is less charged and has an excellent antistatic ability on the adherend. can get. In addition, there is no restriction | limiting in particular as a method to provide an antistatic function, A conventionally well-known method can be used, for example, antistatic resin which consists of an antistatic agent and a resin component, a conductive polymer, a conductive substance Examples thereof include a method of applying a conductive resin, a method of depositing or plating a conductive material, a method of kneading an antistatic agent, and the like.

  The thickness of the base film is 50 μm or more, preferably 50 to 200 μm, more preferably 70 to 150 μm, and further preferably 75 to 130 μm. When the thickness of the base film is within the above range, the workability of bonding when the polarizing plate surface protective film is bonded to the polarizing plate and the transportability after bonding are preferable.

<Adhesive layer of surface protective film for polarizing plate>
The pressure-sensitive adhesive layer constituting the surface protective film for polarizing plate used in the present invention is formed of a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition does not contain an antistatic component. The said adhesive composition contains an adhesive polymer, and if the said adhesive polymer has adhesiveness, it can be especially used without a restriction | limiting. Examples of the pressure-sensitive adhesive composition include an acrylic pressure-sensitive adhesive containing a (meth) acrylic polymer, a urethane pressure-sensitive adhesive containing a urethane polymer, and a silicone pressure-sensitive adhesive containing a silicone polymer. In particular, it is particularly preferable to use an acrylic pressure-sensitive adhesive containing a (meth) acrylic polymer from the viewpoints of adhesiveness and transparency.

  As for the adhesive layer used by this invention, it is preferable that the said adhesive composition contains a crosslinking agent. Moreover, in this invention, it can be set as an adhesive layer using the said adhesive composition. For example, in the case where the pressure-sensitive adhesive composition is an acrylic pressure-sensitive adhesive containing the (meth) acrylic polymer, the constitutional unit, the structural ratio, the selection and addition ratio of the cross-linking agent, etc. are appropriately determined. By adjusting and crosslinking, a pressure-sensitive adhesive layer (surface protective film for polarizing plate) having more excellent heat resistance can be obtained.

  As the crosslinking agent, an isocyanate compound, an epoxy compound, a melamine resin, an aziridine derivative, a metal chelate compound, or the like may be used. In particular, the use of an isocyanate compound is a preferred embodiment. Moreover, these compounds may be used independently and may be used in mixture of 2 or more types.

  Furthermore, the pressure-sensitive adhesive composition may contain other known additives, such as powders such as cross-linking catalysts, lubricants, colorants, pigments, plasticizers, tackifiers, and low molecular weight polymers. , Surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, UV absorbers, polymerization inhibitors, silane coupling agents, inorganic or organic fillers, metal powders, particles, foils Or the like can be added as appropriate according to the use for which the material is used.

The pressure-sensitive adhesive composition is characterized by not containing an antistatic component. However, “not containing an antistatic component” means that it contains substantially no antistatic agent and has an antistatic function. It means a pressure-sensitive adhesive layer that does not exhibit (for example, the surface resistance value of the pressure-sensitive adhesive layer surface is 10 ¹³ or more). In addition, when the pressure-sensitive adhesive composition contains an antistatic component, contamination due to transfer of the antistatic component from the pressure-sensitive adhesive layer usually occurs. However, the pressure-sensitive adhesive layer used in the present invention has the pressure-sensitive adhesive composition. When the product does not substantially contain an antistatic component, this contamination can be prevented, and it is excellent in stain resistance and is a preferred embodiment.

<Antistatic layer of surface protective film for polarizing plate>
The surface protective film for polarizing plate used in the present invention has a pressure-sensitive adhesive layer on one side of the base film and the base film, and is on the side opposite to the surface in contact with the pressure-sensitive adhesive layer of the base film. It has an antistatic layer. By providing an antistatic layer on the outermost layer (back surface of the base film) of the surface protective film for polarizing plate, a grounding effect is exhibited and the antistatic property for peeling is excellent, which is a preferred embodiment.

  In order to form the antistatic layer, it is preferable that the base film is subjected to an antistatic treatment. As the antistatic treatment, a general antistatic treatment method can be used and is not particularly limited. For example, an antistatic layer is provided on the back surface of the base film (the surface opposite to the adhesive layer). A method or the like can be used.

  As a method of providing the antistatic layer, an antistatic agent or an antistatic resin containing an antistatic agent and a resin component, and a conductive resin composition or conductive polymer containing a conductive substance and a resin component as a base material are used. Examples thereof include a method of applying to a film and a method of depositing or plating a conductive substance.

  Examples of the antistatic agent include cationic antistatic agents having a cationic functional group such as a quaternary ammonium salt and a pyridinium salt (for example, a primary amino group, a secondary amino group, and a tertiary amino group); Anionic antistatic agents having anionic functional groups such as salts, sulfates, phosphonates, phosphates; zwitterionic antistatics such as alkylbetaines and their derivatives, imidazolines and their derivatives, alanine and their derivatives Agents; nonionic antistatic agents such as amino alcohol and derivatives thereof, glycerin and derivatives thereof, polyethylene glycol and derivatives thereof; and further, the cationic antistatic agent, anionic antistatic agent, and zwitterionic antistatic agent Obtained by polymerizing or copolymerizing a monomer having an ion conductive group Ion conductive polymer has can be mentioned.

  Specifically, the cationic antistatic agent includes a quaternary ammonium group such as alkyltrimethylammonium salt, acyloylamidopropyltrimethylammonium methosulfate, alkylbenzylmethylammonium salt, acylcholine chloride, and polydimethylaminoethyl methacrylate. Examples thereof include (meth) acrylate copolymers having, styrene copolymers having quaternary ammonium groups such as polyvinylbenzyltrimethylammonium chloride, and diallylamine copolymers having quaternary ammonium groups such as polydiallyldimethylammonium chloride. Examples of the anionic antistatic agent include alkyl sulfonate, alkyl benzene sulfonate, alkyl sulfate ester salt, alkyl ethoxy sulfate ester salt, alkyl phosphate ester salt, and sulfonic acid group-containing styrene copolymer. Examples of the zwitterionic antistatic agent include alkyl betaines, alkyl imidazolium betaines, carbobetaine graft copolymers, and the like. Examples of the nonionic antistatic agent include fatty acid alkylolamide, di- (2-hydroxyethyl) alkylamine, polyoxyethylene alkylamine, fatty acid glycerin ester, polyoxyethylene glycol fatty acid ester, sorbitan fatty acid ester, and polyoxysorbitan fatty acid. Examples thereof include esters, polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl ethers, polyethylene glycols, polyoxyethylene diamines, copolymers composed of polyethers, polyesters and polyamides, and methoxypolyethylene glycol (meth) acrylates.

  Examples of the conductive polymer include polyaniline, polypyrrole, and polythiophene.

  Examples of the conductive material 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, iodine. Examples thereof include copper chloride and alloys or mixtures thereof.

  As the resin component, general-purpose resins such as polyester, acrylic, polyvinyl, urethane, melamine, and epoxy are used. When the antistatic agent is a polymer antistatic agent, the antistatic resin may not contain the resin component. In addition, the antistatic resin may contain a methylolated or alkylolized melamine-based, urea-based, glyoxal-based, acrylamide-based compound, epoxy-based compound, or isocyanate-based compound as a crosslinking agent.

  As the formation method by applying the antistatic layer, the antistatic resin, the conductive polymer, and the conductive resin composition are diluted with a solvent or dispersion medium such as an organic solvent or water, and this coating liquid is used as a base film. The method of apply | coating and drying is mentioned. Examples of the organic solvent include methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexanone, n-hexane, toluene, xylene, methanol, ethanol, n-propanol, and isopropanol. These can be used alone or in combination. As the coating method, known coating methods are used, and specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, impregnation and curtain coating methods.

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

  Examples of the method for depositing or plating the conductive material include vacuum deposition, sputtering, ion plating, chemical vapor deposition, spray pyrolysis, chemical plating, and electroplating.

  The thickness of the antistatic layer (conductive material layer) formed by vapor deposition or plating is preferably 20 to 10000 mm (0.002 to 1 μm), more preferably 50 to 5000 mm (0.005 to 0.5 μm). is there.

<Surface protective film for polarizing plate>
The surface protective film for polarizing plate used in the present invention has a base film and an adhesive layer on one side of the base film, and is antistatic on the side opposite to the side in contact with the adhesive layer of the base film. The method of forming the pressure-sensitive adhesive layer by crosslinking of the pressure-sensitive adhesive composition is generally carried out after the application of the pressure-sensitive adhesive composition. It is also possible to transfer the pressure-sensitive adhesive layer comprising the adhesive composition to a substrate film or the like.

  The method for forming the pressure-sensitive adhesive layer on the base film is not particularly limited. For example, the pressure-sensitive adhesive layer is formed by applying the pressure-sensitive adhesive composition (solution) to the base film and removing the polymerization solvent by drying. It is produced by forming on a base film. Thereafter, curing may be performed for the purpose of adjusting the component transfer of the pressure-sensitive adhesive layer or adjusting the crosslinking reaction. Moreover, when producing a surface protective film for a polarizing plate by applying the pressure-sensitive adhesive composition on a base film, other than the polymerization solvent in the pressure-sensitive adhesive composition so that it can be uniformly applied onto the base film. One or more solvents may be newly added.

  Moreover, as a formation method of the adhesive layer at the time of manufacturing the surface protection film for polarizing plates used by this invention, the well-known method used for manufacture of adhesive tapes is used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, extrusion coating using a die coater, and the like.

  The surface protective film for polarizing plate used in the present invention is usually produced so that the pressure-sensitive adhesive layer has a thickness of 3 to 100 μm, preferably about 5 to 50 μm. It is preferable for the thickness of the pressure-sensitive adhesive layer to be within the above range because it is easy to obtain an appropriate balance between removability and adhesiveness.

  Moreover, it is preferable that the total thickness of the surface protective film for polarizing plates used by this invention is 5-300 micrometers, It is more preferable that it is 10-200 micrometers, It is most preferable that it is 12-100 micrometers. Within the above range, the adhesive properties (removability, adhesiveness, etc.), workability, and appearance properties are excellent and a preferred embodiment is obtained. In addition, the said total thickness means the sum total of the thickness containing all layers, such as a base film, an adhesive layer, an antistatic layer, and another layer.

  The surface protective film for polarizing plates disclosed herein may be implemented in an embodiment that further includes other layers in addition to the base film, the pressure-sensitive adhesive layer, and the antistatic layer. Examples of the other layer include an undercoat layer (anchor layer) that improves the anchoring property of the antistatic layer and the pressure-sensitive adhesive layer.

<Polarizing plate>
The polarizing plate used in the present invention has a polarizer and a protective film for polarizer on at least one surface of the polarizer, and a conductive polymer on the opposite side of the surface of the protective film for polarizer that contacts the polarizer. It has the antistatic layer formed with the antistatic agent composition containing this, It is characterized by the above-mentioned. Moreover, the thing of the structure which laminated | stacked the adhesive layer on the at least single side | surface of the said polarizing plate can be used, and other optical members (for example, on the surface on the opposite side to the surface which has contacted the said polarizing plate of the said adhesive layer, for example). A retardation film, a liquid crystal display device, and the like). The antistatic layer located on the surface layer of the polarizing plate and the pressure-sensitive adhesive layer constituting the surface protective film for polarizing plate are directly laminated (contacted).

<Polarizer>
As the polarizer used in the present invention, a polarizer using a polyvinyl alcohol resin is used. Examples of polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films. Examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products. Among these, a polarizer composed of a polyvinyl alcohol film and a dichroic material such as iodine is preferable.

  A polarizer obtained by dyeing the polyvinyl alcohol film with iodine and uniaxially stretching it can be prepared by, for example, dyeing polyvinyl alcohol in an aqueous solution of iodine and stretching it 3 to 7 times the original length. . If necessary, it may contain boric acid, zinc sulfate, zinc chloride, or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing. In addition to washing the polyvinyl alcohol film surface with dirt and anti-blocking agents by washing the polyvinyl alcohol film with water, it also has the effect of preventing unevenness such as uneven coloring by swelling the polyvinyl alcohol film. is there. Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. The film can be stretched even in an aqueous solution such as boric acid or potassium iodide or in a water bath.

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

The polarizer has an optical property represented by the following formula: P> − (100.929T-42.4-1) × 100 (where T <42.3), or , P ≧ 99.9 (however, T ≧ 42.3) is preferably satisfied. A polarizer configured so as to satisfy the above-described conditions uniquely has performance required as a display for a liquid crystal television using a large display element. Specifically, the contrast ratio is 1000: 1 or more and the maximum luminance is 500 cd / m ² or more. As other uses, for example, it is bonded to the viewing side of the organic EL cell.

<Protective film for polarizer>
The material constituting the polarizer protective film is not particularly limited, but a polymer (resin) excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropic property, ultraviolet absorption property, and the like is preferable. Examples include polyester polymers (polyester resins) such as polyethylene terephthalate and polyethylene naphthalate, (meth) acrylic polymers ((meth) acrylic resins) such as polymethyl methacrylate, polycarbonate polymers (polycarbonate resins), and the like. It is done. Further, polyethylene, polypropylene, polyolefin having a cyclo or norbornene structure (cyclic olefin resin), and the like are also examples of the polymer that forms the protective film for a polarizer. Among them, the protective film for a polarizer is preferably formed of at least one resin selected from the group consisting of (meth) acrylic resins, cyclic olefin resins, polyester resins, and polycarbonate resins. It is particularly preferable to use a resin having an ultraviolet absorbing function. These protective films for polarizers are usually bonded to the polarizer by an adhesive layer.

  In addition, 1 or more types of arbitrary appropriate additives may be contained in the protective film for polarizers. Examples of the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent. The content of the polymer in the protective film for a polarizer is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. . When the content of the polymer in the protective film for a polarizer is 50% by weight or less, there is a possibility that the high transparency and the like inherent to the polymer cannot be sufficiently exhibited.

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

  A functional layer such as a hard coat layer, an anti-reflection layer, an anti-sticking layer, a diffusion layer or an anti-glare layer can be provided on the surface of the protective film for polarizer to which the polarizer is not adhered. The functional layers such as the hard coat layer, antireflection layer, antisticking layer, diffusion layer and antiglare layer can be provided on the protective film for the polarizer itself, and separately from the protective film for the polarizer. It can also be provided.

  In addition, in laminating | stacking a polarizer and the protective film for polarizers, an easily bonding layer can be provided between the protective film for polarizers, and an adhesive bond layer.

<Antistatic layer of polarizing plate>
The polarizing plate with a surface protective film for a polarizing plate of the present invention has a polarizer and a surface in contact with the polarizer of the polarizer protective film, having a polarizer protective film on at least one surface of the polarizer. It has a polarizing plate having an antistatic layer formed of an antistatic agent composition containing a conductive polymer on the opposite side, and the antistatic layer of the polarizing plate via the adhesive layer of the surface protective film for the polarizing plate Further, the surface protective film for polarizing plate is laminated. Since the antistatic layer is an antistatic layer formed from an antistatic agent composition containing a conductive polymer, an increase in surface resistance value can be suppressed even in a high temperature environment, and excellent in flexibility and durability. An antistatic layer is obtained, which is a preferred embodiment.
Furthermore, by having an antistatic layer on the surface of the polarizing plate, there is no need to impart antistatic properties to the pressure-sensitive adhesive layer constituting the surface protective film for polarizing plate that is directly laminated (contacted) with the antistatic layer, That is, since it is not necessary to add an antistatic component, it is preferable because it has excellent stain resistance and good appearance. In particular, the polyaniline sulfonic acid and the polythiophenes doped with the polyions are blended within the above range, so that the polyaniline sulfonic acids alone or the polythiophenes doped with the polyions can be used alone. The reason why the stability of the antistatic property in a high temperature environment is improved as compared with the case of blending is presumed as follows. Polythiophenes doped in polyanions are composed of polythiophenes in which the anion groups of polyanions are coordinated to form a complex, and the conduction mechanism is the intramolecular conductivity of polythiophenes occurring in the complex, polythiophenes The intermolecular conduction and the conduction between complex structures are known. Here, the conduction between the complex structures is a rate-determining process because the intermolecular distance is large. By using polyaniline sulfonic acid, which is a polymer higher than polythiophenes, the polyaniline sulfonic acid connects between the complexes composed of polythiophenes and polyanions, and itself has conductivity, so the conductivity between the complexes can be increased. It is presumed that the antistatic property and the stability under a high temperature environment are increased, and it becomes very useful as a polarizing plate. In addition, when the polyaniline sulfonic acid is used alone as a conductive polymer, the initial conductivity is low, and thus the peeling voltage and the surface resistance value with time are likely to increase.
In addition, when the polythiophenes doped with the polyanions alone are used, the initial conductivity is high, but the polyanions (corresponding to the dopant) are more likely to be detached from the polythiophenes over time, so that the peeling over time An increase in the charged voltage or surface resistance is likely to occur, which is not preferable.

<Conductive polymer>
The antistatic layer is preferably formed of an antistatic agent composition containing, as a conductive polymer component, polyaniline sulfonic acid and polythiophenes doped with polyions. Compared to the combination of each of the above conductive polymers, polyaniline sulfonic acid is responsible for the conduction between the core-shell structures of polythiophenes / polyanions, so the conductivity is increased and peeling antistatic is based on the antistatic layer. And antistatic property under a high temperature environment can be stabilized and become useful.

  The content of the conductive polymer is preferably 1 to 90% by weight, more preferably 5 to 80% by weight, and still more preferably 10 to 70% by weight, based on all components contained in the antistatic layer. And most preferably 20-50% by weight. If the content of the conductive polymer is too low, the antistatic effect may be reduced, and if the content of the conductive polymer is too high, the adhesion of the antistatic layer to the base material (protective film for the polarizer) Is not preferable because it may drop or the transparency may decrease.

The polyaniline sulfonic acid used as the conductive polymer component preferably has a standard polystyrene equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of 5 × 10 ⁵ or less. × 10 ⁵ or less is more preferable. In addition, the weight average molecular weight of these conductive polymers is usually preferably 1 × 10 ³ or more, and more preferably 5 × 10 ³ or more.

  As a commercial item of the said polyaniline sulfonic acid, the brand name "aqua-PASS" by Mitsubishi Rayon Co., Ltd. etc. are illustrated.

  Examples of the polythiophenes used as the conductive polymer component include polythiophene, poly (3-methylthiophene), poly (3-ethylthiophene), poly (3-propylthiophene), poly (3-butylthiophene), and polythiophene. (3-hexylthiophene), poly (3-heptylthiophene), poly (3-octylthiophene), poly (3-decylthiophene), poly (3-dodecylthiophene), 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 ( -Methoxythiophene), poly (3-ethoxythiophene), poly (3-butoxythiophene), poly (3-hexyloxythiophene), poly (3-heptyloxythiophene), poly (3-octyloxythiophene), 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-dihexyloxythiophene), poly (3,4-diheptyloxythiophene) , Poly (3,4-dioctyloxythiophene), poly (3,4-dideci Oxythiophene), poly (3,4-didodecyloxythiophene), poly (3,4-ethylenedioxythiophene), poly (3,4-propylenedioxythiophene), poly (3,4-butenedioxythiophene) ), Poly (3-methyl-4-methoxythiophene), poly (3-methyl-4-ethoxythiophene), poly (3-carboxythiophene, poly (3-methyl-4-carboxythiophene), poly (3-methyl -4-carboxyethylthiophene) and poly (3-methyl-4-carboxybutylthiophene), which may be used alone or in combination of two or more. In view of the above, poly (3,4-ethylenedioxythiophene) (PEDOT) is preferable.

  The polythiophenes have a polymerization degree of preferably 2 to 1000, more preferably 5 to 100. It is preferable for it to be within the above range because of its excellent conductivity.

  The polyanions are polymers of structural units having an anionic group and serve as dopants for polythiophenes. Examples of the polyanions include polystyrene sulfonic acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polyacryl sulfonic acid, polymethacryl sulfonic acid, poly (2-acrylamido-2-methylpropane sulfonic acid), polyisoprene sulfonic acid, poly Sulfoethyl methacrylate, poly (4-sulfobutyl methacrylate), polymethallyloxybenzene sulfonic acid, polyvinyl carboxylic acid, polystyrene carboxylic acid, polyallyl carboxylic acid, polyacryl carboxylic acid, polymethacryl carboxylic acid, poly (2-acrylamide- 2-methylpropanecarboxylic acid), polyisoprenecarboxylic acid, polyacrylic acid, polysulfonated phenylacetylene and the like. These homopolymers may be sufficient and 2 or more types of copolymers may be sufficient. Of these, polystyrene sulfonic acid (PSS) is preferred.

  The polyanions preferably have a weight average molecular weight (Mw) of 1,000 to 1,000,000, more preferably 2,000 to 500,000. Within the above range, doping to polythiophenes and excellent dispersibility are preferable.

  Commercially available products of polythiophenes doped with the polyanions include, for example, poly (3,4-ethylenedioxythiophene) / polystyrene sulfonic acid (PEDOT / PSS) trade name “Bytron P” manufactured by BAYER, Shin-Etsu. Examples include the product name “Seplujida” manufactured by Polymer Co., Ltd., the product name “Verazol” manufactured by Soken Chemical Co., Ltd., and the product name “Denatron P-502RG” manufactured by Nagase ChemteX Corporation. Among them, when PEDOT / PSS is used for the antistatic layer constituting the polarizing plate, the occurrence of contamination is suppressed compared to the case where an antistatic component is used for the pressure-sensitive adhesive layer constituting the surface protective film for polarizing plate, Since it is excellent in stain resistance and PEDOT / PSS is a conductive polymer, an antistatic layer excellent in flexibility and durability is obtained, which is a preferred embodiment.

  In the antistatic agent composition, the mixing ratio (weight ratio) of the polyaniline sulfonic acid and the polythiophenes doped with the polyaniline (the polyaniline sulfonic acid: the polythiophenes doped with the polyanions) is: It is preferably 90:10 to 10:90, more preferably 85:15 to 15:85, and still more preferably 80:20 to 20:80. If it is in the said range, a surface resistance value can be restrained low, it is excellent in stability of the surface resistance value especially in a high temperature environment, and becomes a preferable aspect. In addition, when the content of the polyaniline sulfonic acid is small, or when the content of the polythiophenes doped with the polyanions is small, the surface resistance value in a high temperature environment tends to increase, which is not preferable.

<Binder>
The antistatic layer can contain a binder component and can be used without any particular limitation. However, in order to impart solvent resistance, mechanical strength, charging characteristics, and thermal stability, the antistatic layer contains a polyester resin as a binder. It is preferable that it is formed by the agent composition. The polyester resin is preferably a resin material containing polyester as a main component (typically more than 50% by weight, preferably 75% by weight or more, for example, 90% by weight or more). The polyester typically includes polyvalent carboxylic acids (typically dicarboxylic acids) having two or more carboxyl groups in one molecule and derivatives thereof (an anhydride, esterified product, halogenated product of the polyvalent carboxylic acid). Selected from one or more compounds (polyhydric carboxylic acid component) selected from, and polyhydric alcohols (typically diols) having two or more hydroxyl groups in one molecule. It is preferable to have a structure in which one or two or more compounds (polyhydric alcohol component) are condensed.

  Examples of compounds that can be employed as the polyvalent carboxylic acid component include oxalic acid, malonic acid, difluoromalonic acid, alkylmalonic acid, succinic acid, tetrafluorosuccinic acid, alkylsuccinic acid, (±) -malic acid, meso. -Tartaric acid, itaconic acid, maleic acid, methylmaleic acid, fumaric acid, methylfumaric acid, acetylenedicarboxylic acid, glutaric acid, hexafluoroglutaric acid, methylglutaric acid, glutaconic acid, adipic acid, dithioadipic acid, methyladipic acid, dimethyl Adipic acid, tetramethyladipic acid, methyleneadipic acid, muconic acid, galactaric acid, pimelic acid, suberic acid, perfluorosuberic acid, 3,3,6,6-tetramethylsuberic acid, azelaic acid, sebacic acid, perfluoro Sebacic acid, brassic acid, dodecyl dicar Aliphatic dicarboxylic acids such as acid, tridecyl dicarboxylic acid, tetradecyl dicarboxylic acid; cycloalkyl dicarboxylic acid (for example, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid), 1,4- (2- Alicyclic dicarboxylic acids such as norbornene) dicarboxylic acid, 5-norbornene-2,3-dicarboxylic acid (hymic acid), adamantane dicarboxylic acid, spiroheptane dicarboxylic acid; phthalic acid, isophthalic acid, dithioisophthalic acid, methylisophthalic acid, Dimethylisophthalic acid, chloroisophthalic acid, dichloroisophthalic acid, terephthalic acid, methylterephthalic acid, dimethylterephthalic acid, chloroterephthalic acid, bromoterephthalic acid, naphthalenedicarboxylic acid, oxofluorenedicarboxylic acid, anthracenedical Bonic acid, biphenyl dicarboxylic acid, biphenylene dicarboxylic acid, dimethyl biphenylene dicarboxylic acid, 4,4 "-p-terephenylene dicarboxylic acid, 4,4" -p-quarelphenyl dicarboxylic acid, bibenzyl dicarboxylic acid, azobenzene dicarboxylic acid, Homophthalic acid, phenylenediacetic acid, phenylenedipropionic acid, naphthalenedicarboxylic acid, naphthalenedipropionic acid, biphenyldiacetic acid, biphenyldipropionic acid, 3,3 ′-[4,4 ′-(methylenedi-p-biphenylene) dipropion Aromatic dicarboxylic acids such as acid, 4,4′-bibenzyldiacetic acid, 3,3 ′ (4,4′-bibenzyl) dipropionic acid, oxydi-p-phenylenediacetic acid; Acid anhydrides of any of the polyhydric carboxylic acids mentioned above (Eg alkyl esters). It can be a monoester, a diester or the like. ); Acid halides corresponding to any of the polyvalent carboxylic acids described above (for example, dicarboxylic acid chloride); and the like.

  Preferable examples of the compound that can be employed as the polyvalent carboxylic acid component include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and acid anhydrides thereof; adipic acid, sebacic acid, azelaic acid, succinic acid, Aliphatic dicarboxylic acids such as fumaric acid, maleic acid, hymic acid, 1,4-cyclohexanedicarboxylic acid, and acid anhydrides thereof; and lower alkyl esters of the dicarboxylic acids (for example, monoalcohols having 1 to 3 carbon atoms) Ester) and the like.

  On the other hand, examples of compounds that can be employed as the polyhydric alcohol component include ethylene glycol, propylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, and 1,4-butanediol. , Neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 3-methylpentanediol, diethylene glycol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl- Diols such as 1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, xylylene glycol, hydrogenated bisphenol A, and bisphenol A Is mentioned. Other examples include alkylene oxide adducts (for example, ethylene oxide adducts, propylene oxide adducts, etc.) of these compounds.

The molecular weight of the polyester resin is, for example, about 5 × 10 ^{3 to} 1.5 × 10 ⁵ (preferably 1 × 10 5) as a number average molecular weight (Mn) in terms of standard polystyrene measured by gel permeation chromatography (GPC). ^4-6 × 10 ⁴ ). Moreover, the glass transition temperature (Tg) of the said polyester resin can be 0-120 degreeC (preferably 10-80 degreeC), for example.

  As a commercial item of the said polyester resin, Toyobo Co., Ltd. brand name Bironal MD-1100, MD-1200, MD-1245, MD-1335, MD-1480, MD-1500, MD-1930, MD-1985, MD -2000, trade names plus coats Z-221, Z-446, Z-561, Z-565, Z-880, Z-3310, RZ-105, RZ-570, Z-730, Z manufactured by Kyoyo Chemical Industry Co., Ltd. -760, Z-592, Z-687, Z-690, Pesresin A-110, A-120, A-124GP, A-125S, A-160P, A-520, A-613D, A manufactured by Takamatsu Yushi Co., Ltd. -615GE, A-640, A-645GH, A-647GEX, A-680, A-684G, WAC-14, WAC-17XC, etc. .

  The antistatic layer is a resin other than a polyester resin (for example, an acrylic resin, an acrylic-urethane resin) as a binder, as long as the performance of the polarizing plate disclosed herein (for example, performance such as antistatic properties) is not significantly impaired. , Acrylic-styrene resin, acrylic-silicone resin, silicone resin, polysilazane resin, fluororesin, styrene resin, alkyd resin, urethane resin, amide resin, polyolefin resin, etc.) Can also be used. When using the said resin in combination, the antistatic layer whose ratio of the polyester resin to a binder is 51 to 100 weight% is preferable. The proportion of the binder in the whole antistatic layer can be, for example, 50 to 95% by weight, and is usually suitably 60 to 90% by weight.

<Lubricant>
The antistatic agent composition used when forming the antistatic layer in the technique disclosed herein is a lubricant comprising a fatty acid amide, a fatty acid ester, a silicone lubricant, a fluorine lubricant, and a wax lubricant. It is a preferred embodiment to use at least one selected. By using the lubricant, the surface of the antistatic layer is not subjected to a further release treatment (for example, a treatment in which a known release treatment agent such as a silicone release agent or a long-chain alkyl release agent is applied and dried). In this case, since an antistatic layer having both sufficient slipping property and printing adhesion can be obtained, it can be a preferable embodiment. Thus, the aspect in which the surface of the antistatic layer is not further peeled can prevent whitening due to the peeling treatment agent (for example, whitening due to storage under heating and humidification conditions). This is preferable. It is also advantageous from the viewpoint of solvent resistance.

  Specific examples of the fatty acid amide include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxystearic acid amide, oleic acid amide, erucic acid amide, N-oleylparticic acid amide, N-stearyl stearic acid. Amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, methylol stearic acid amide, methylene bis stearic acid amide, ethylene biscapric acid amide, ethylene bis lauric acid amide, ethylene bis stearic acid Amides, ethylene bishydroxystearic acid amides, ethylene bisbehenic acid amides, hexamethylene bisstearic acid amides, hexamethylene bisbehenic acid amides, hexamethylene hydroxystearic acid amides N, N′-distearyl adipic acid amide, N, N′-distearyl sebacic acid amide, ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N, N′-dioleyl Examples include adipic acid amide, N, N′-dioleyl sebacic acid amide, m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, N, N′-stearyl isophthalic acid amide, and the like. These lubricants may be used alone or in combination of two or more.

  Specific examples of the fatty acid ester include polyoxyethylene bisphenol A laurate, butyl stearate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, monoglyceride behenate, cetyl 2-ethylhexanoate, isopropyl myristate, palmitate Isopropyl acid, cholesteryl isostearate, lauryl methacrylate, methyl palm fatty acid, methyl laurate, methyl oleate, methyl stearate, myristyl myristate, octyldodecyl myristate, pentaerythritol monooleate, pentaerythritol monostearate, pentaerythritol Tetrapalmitate, stearyl stearate, isotridecyl stearate, 2-ethylhexanoic acid triglyceride, Butyl Ulin acid, octyl oleate. These lubricants may be used alone or in combination of two or more.

  Specific examples of the silicone lubricant include polydimethylsiloxane, polyether modified polydimethylsiloxane, amino modified polydimethylsiloxane, epoxy modified polydimethylsiloxane, carbinol modified polydimethylsiloxane, mercapto modified polydimethylsiloxane, carboxyl modified polydimethyl. Siloxane, methyl hydrogen silicone, methacrylic modified polydimethylsiloxane, phenol modified polydimethylsiloxane, silanol modified polydimethylsiloxane, aralkyl modified polydimethylsiloxane, fluoroalkyl modified polydimethylsiloxane, long chain alkyl modified polydimethylsiloxane, higher fatty acid modified ester Modified polydimethylsiloxane, higher fatty acid amide modified polydimethylsiloxane, phenyl modified poly Such as methyl siloxane. These lubricants may be used alone or in combination of two or more.

  Specific examples of the fluorine-based lubricant include perfluoroalkane, perfluorocarboxylic acid ester, fluorine-containing block copolymer, polyether polymer having a fluorinated alkyl group, and the like. These lubricants may be used alone or in combination of two or more.

  Specific examples of the wax-based lubricant include petroleum wax (paraffin wax, etc.), plant wax (carnauba wax, etc.), mineral wax (montan wax, etc.), higher fatty acid (serotic acid, etc.), and neutral fat (palmitin). And various waxes such as acid triglyceride). These lubricants may be used alone or in combination of two or more.

  The ratio of the lubricant to the whole antistatic layer can be 1 to 50% by weight, and usually 5 to 40% by weight is appropriate. When there is too little content rate of a lubricant, it exists in the tendency for slipperiness to fall easily. When the content ratio of the lubricant is too large, the print adhesion and the back surface peeling force (adhesive force) may be reduced.

  The antistatic agent composition forming the antistatic layer comprises 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. It is preferable to contain, and it is a preferable aspect by using the said melamine type crosslinking agent and / or an isocyanate type crosslinking agent especially. When forming an antistatic layer, conductive polymer components (for example, polythiophenes doped with polyaniline sulfonic acid or polyanions) can be fixed in the binder, providing excellent water resistance and solvent resistance. It is possible to achieve an effect such as improvement. 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, and by using these crosslinking agents in combination. Water resistance, solvent resistance and printing adhesion are improved and useful.

  As the melamine-based crosslinking agent, melamine, alkylated melamine, methylol melamine, alkoxylated methyl melamine and the like can be used.

  In addition, as the isocyanate-based crosslinking agent, it is preferable to use a blocked isocyanate-based crosslinking agent that is stable even in an aqueous solution. Specific examples of the blocked isocyanate crosslinking agent include isocyanate crosslinking agents that can be used in the preparation of general pressure-sensitive adhesive layers and antistatic layers, such as alcohols, phenols, thiophenols, amines, and imides. , Oximes, lactams, active methylene compounds, mercaptans, imines, ureas, diaryl compounds, sodium bisulfite and the like can be used.

  The antistatic layer in the technology disclosed herein includes an antistatic agent, an antioxidant, a colorant (pigment, dye, etc.), a fluidity modifier (thixotropic agent, a thickener, etc.), a film-forming as necessary. It may contain additives such as auxiliaries, surfactants (antifoaming agents, etc.), preservatives and the like. Moreover, it is also possible to contain a glycidyl compound, a polar solvent, a polyhydric aliphatic alcohol, a lactam compound, etc. as a conductivity improver.

<Formation of antistatic layer>
The antistatic layer is a liquid composition in which an additive used in accordance with the conductive polymer component or the like is dissolved or dispersed in an appropriate solvent (such as water) (a coating material for forming an antistatic layer, an antistatic composition) Product) can be suitably formed by a technique including imparting a base material (protective film for a polarizer). For example, a method of applying the coating material on one side of a base material (protective film for polarizer) and drying it, and performing a curing treatment (heat treatment, ultraviolet treatment, etc.) as necessary can be preferably employed. The NV (nonvolatile content) of the coating material can be, for example, 5% by weight or less (typically 0.05 to 5% by weight), and usually 1% by weight or less (typically 0.10 to 10%). 1% by weight) is appropriate. When forming an antistatic layer with a small thickness, it is preferable that the NV of the coating material is, for example, 0.05 to 0.50% by weight (for example, 0.10 to 0.40% by weight). Thus, a more uniform antistatic layer can be formed by using a low NV coating material.

  As the solvent constituting the coating material for forming the antistatic layer, those capable of stably dissolving or dispersing the components for forming the antistatic layer are preferable. Such a solvent may be an organic solvent, water, or a mixed solvent thereof. Examples of the organic solvent include esters such as ethyl acetate; ketones such as methyl ethyl ketone, acetone and cyclohexanone; cyclic ethers such as tetrahydrofuran (THF) and dioxane; aliphatic or alicyclic such as n-hexane and cyclohexane. Hydrocarbons; aromatic hydrocarbons such as toluene and xylene; aliphatic or alicyclic alcohols such as methanol, ethanol, n-propanol, isopropanol, and cyclohexanol; alkylene glycol monoalkyl ether (for example, ethylene glycol monomethyl ether) , Ethylene glycol monoethyl ether), glycol ethers such as dialkylene glycol monoalkyl ether; and the like can be used. 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).

  Moreover, in order to improve the dispersion stability to a solvent, it is possible to contain a basic organic compound that can be coordinated or bonded as an ion pair to the anion group of the polyanions. Examples of the basic organic compound include known amine compounds, hydrochlorides of amine compounds, cationic emulsifiers, basic resins, and the like.

  Specific examples of the basic organic compound include methyloctylamine, methylbenzylamine, N-methylaniline, dimethylamine, diethylamine, diethanolamine, N-methylethanolamine, di-n-propylamine, diisopropylamine, methyl- Isopropanolamine, dibutylamine, di-2-ethylhexylamine, aminoethylethanolamine, 3-amino-1-propanol, isopropylamine, monoethylamine, 2-ethylhexylamine, t-butylamine, N- (2-aminoethyl)- 3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropylto Amine compounds such as limethoxysilane, 3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, hydrochlorides of primary amines such as monomethylamine, monoethylamine, stearylamine, dimethylamine, diethylamine, Secondary amine hydrochlorides such as distearylamine, tertiary amine hydrochlorides such as trimethylamine, triethylamine, stearyldimethylamine, quaternary ammonium salts such as stearyltrimethylammonium chloride, distearyldimethylammonium chloride, stearyldimethylbenzylammonium chloride , Hydrochlorides of ethanolamines such as monoethanolamine, diethanolamine and triethanolamine, polyethylenepolyethylene such as ethylenediamine and diethylenetriamine Hydrochloride Min acids and the like.

  Specific examples of the cationic emulsifier include alkyl ammonium salts, alkyl amide betaines, and alkyl dimethyl amine oxides.

  Specific examples of the basic resin include polyester, acrylic, and urethane polymer copolymers, and those having a weight average molecular weight (Mw) of 1,000 to 1,000,000. If the weight average molecular weight of the basic resin is less than 1,000, sufficient steric hindrance may not be obtained, and the dispersion effect may be reduced.

  The amine value of the basic resin is preferably 5 to 200 mgKOH / g. If it is less than 5 mgKOH / g, the interaction with polyanions doped in polythiophenes tends to be insufficient, and a sufficient dispersion effect may not be obtained. On the other hand, when the amine value of the basic resin exceeds 200 mgKOH / g, the steric hindrance layer may be reduced and the dispersion effect may be insufficient as compared with the affinity part for polyanions doped in polythiophenes.

  Examples of the basic resin include Solsperse 17000, Solsperse 20000, Solsperse 24000, Solsperse 32000 (manufactured by GENEKA CORPORATION), Disperbyk-160, Disperbyk-161, Disperbyk-162, Disperbyk-163, DisperbykD-200, Disperbyk-170, (By Big Chemie), Addisper PB711, Addisper PB821, Addisper PB822, Addisper PB824 (Ajinomoto Co., Inc.), Epomin 006, Epomin 012, Epomin 018 (Nippon Shokubai Co., Ltd.), EFKA4046, EFKA4300, EFKA4330, EFKA4330, EFKA4330 Made), dispa Emissions DA-400 N (manufactured by Kusumoto Chemicals Chemical Co.), etc., and can be used alone or in combination. In particular, Addisper PB821, Addisper PB822, and Addisper PB824 are preferable in terms of dispersibility and conductivity during use.

  Although there is no restriction | limiting in content of the said basic compound, 1 weight part-100,000 weight part are preferable with respect to a total of 100 weight part of polythiophenes and polyanions, More preferably, 10 weight part-10,000 weight part Can be added in the range of

<Properties of antistatic layer>
The thickness of the antistatic layer (after heat stretching) is preferably 100 nm or less, more preferably 3 to 100 nm, still more preferably 20 to 80 nm. If the thickness of the antistatic layer is too small, it becomes difficult to form the antistatic layer uniformly (for example, the thickness of the antistatic layer varies greatly depending on the location). Unevenness can easily occur. On the other hand, if it is too thick, it may affect the properties (optical properties, dimensional stability, etc.) of the polarizing plate.

The surface resistance value (Ω / □) measured on 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 , More preferably, it is 1.0 * 10 < ⁶ > -1.0 * 10 < ⁷ >. The polarizing plate showing the surface resistance value within the above range suppresses the charging of the surface protective film for the polarizing plate due to frictional charging that occurs in the processing step and the transport step, and sucks dust and reduces workability. It can be prevented and can be suitably used. In addition, the said surface resistance value can be computed from the surface resistance value measured in the atmosphere of temperature 23 degreeC and humidity 50% RH using a commercially available insulation resistance measuring apparatus.

<First adhesive layer>
A structure in which the first pressure-sensitive adhesive layer is laminated on at least one surface of the polarizing plate can be used, and other optical members are provided on the surface of the front first pressure-sensitive adhesive layer opposite to the surface in contact with the polarizing plate. (For example, a phase difference film, a liquid crystal display device, etc.) etc. can be laminated | stacked (refer FIG. 2). An appropriate pressure-sensitive adhesive (pressure-sensitive adhesive composition) can be used for the first pressure-sensitive adhesive layer, and the type thereof is not particularly limited. Adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl pyrrolidone adhesives, polyacrylamide adhesives, Examples thereof include cellulose-based pressure-sensitive adhesives. Among these pressure-sensitive adhesives (pressure-sensitive adhesive compositions), those that are excellent in optical transparency, exhibit appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and are excellent in weather resistance, heat resistance, etc. are preferably used. The An acrylic pressure-sensitive adhesive is preferably used as one exhibiting such characteristics.

  As a method for forming the first pressure-sensitive adhesive layer, for example, the pressure-sensitive adhesive (pressure-sensitive adhesive composition) is applied to a release-treated separator, the polymerization solvent and the like are removed by drying, and then a pressure-sensitive adhesive layer is formed. Or a method of applying the pressure-sensitive adhesive to a polarizing plate, drying and removing the polymerization solvent, and forming a pressure-sensitive adhesive layer on the polarizer. In applying the pressure-sensitive adhesive, one or more solvents other than the polymerization solvent may be added as appropriate. A silicone separator is preferably used as the release-treated separator.

  In the step of applying the pressure-sensitive adhesive (pressure-sensitive adhesive composition) on such a separator and drying to form the pressure-sensitive adhesive layer, as a method of drying the pressure-sensitive adhesive, an appropriate method can be appropriately used according to the purpose. Can be employed. Preferably, a method of heating and drying the coating film is used. The heat drying temperature is preferably 40 to 200 ° C, more preferably 50 to 180 ° C, and particularly preferably 70 to 170 ° C. By setting the heating temperature in the above range, an adhesive layer having excellent adhesive properties can be obtained.

  Various methods are used as a method of forming the pressure-sensitive adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.

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

  The separator can protect the first pressure-sensitive adhesive layer until it is practically used. Examples of the constituent material of the separator include, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof. Although a thin leaf body etc. can be mentioned, a plastic film is used suitably from the point which is excellent in surface smoothness. The plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer. For example, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, and a vinyl chloride film are used. Examples thereof include a polymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.

  The separator may be a silicone type, a fluorine type, a long chain alkyl type or a fatty acid amide type release agent, a mold release and antifouling treatment with silica powder, a coating type, a kneading type, a vapor deposition type, etc. The antistatic treatment can also be performed. In particular, the release property from the first pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment on the surface of the release film.

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

  The polarizing plate disclosed herein may also include an antistatic layer, a protective film for a polarizer, a polarizer, and an additional layer in addition to an intervening layer (such as an adhesive layer and a first pressure-sensitive adhesive layer). Can be implemented.

<Polarizing plate with surface protective film for polarizing plate>
The polarizing plate with a surface protective film of the present invention comprises the polarizing plate and the surface protective film for a polarizing plate on an antistatic layer of the polarizing plate via an adhesive layer of the surface protective film for a polarizing plate, The surface protective film for polarizing plates is laminated. The polarizing plate with a surface protective film of the present invention has a specific configuration (lamination order), and thus the polarizing plate is used after being laminated (attached) to a liquid crystal display (LCD) or the like. When the film is peeled off, the antistatic layer constituting the polarizing plate protective film and the antistatic layer constituting the polarizing plate are in a specific position (stacking order). Can be prevented, and is excellent in peeling antistatic property and useful. In addition, since the pressure-sensitive adhesive layer does not use an antistatic component, it has excellent anti-contamination property, and by having an antistatic layer constituting the polarizing plate, it is excellent in flexibility and durability (abrasion resistance) and useful. It becomes.

  Hereinafter, several examples related to the present invention will be described, but the present invention is not intended to be limited to those shown in the specific examples. In the following description, “parts” and “%” are based on weight unless otherwise specified. Further, the blending amount (addition amount) in the table is shown.

  Each characteristic in the following description was measured or evaluated as follows. 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, it prepared according to the structure of Table 1, a positional relationship, etc.

<Preparation of protective film for polarizer>
An acrylic resin (trade name: Acrypet VH, Tg: 113 ° C., manufactured by Mitsubishi Rayon Co., Ltd.) was vacuum-dried at 100 ° C. to deaerate moisture and residual oxygen. A twin screw extruder (equipment) in which a mixture obtained by adding 30 parts by weight of acrylic rubber (trade name: AR12, manufactured by Nippon Zeon Co., Ltd.) to 100 parts by weight of degassed acrylic resin was replaced with nitrogen from the raw material hopper to the extruder. Name: TEM35B, manufactured by Toshiba Machine Co., Ltd.), melted at a cylinder set temperature of 230 to 270 ° C., and pelletized to obtain raw material pellets. The obtained raw material pellets are vacuum dried at 100 ° C. and supplied to a single screw extruder (device name: SE-65, manufactured by Toshiba Machine Co., Ltd.) in which the material hopper to the extruder are replaced with nitrogen. After melting at 230 to 270 ° C., passing through a coat hanger type T-die, and cooling with a casting roll made of chrome plating at 120 ° C. and a cooling roll made of chrome plating at 90 ° C., with a film winding device An acrylic resin film (thickness: 40 μm), which is a protective film for a polarizer, was obtained.

<Preparation of protective film for polarizer with antistatic layer (polymer type)>
On the acrylic resin film (thickness: 40 μm) as the protective film for the polarizer, Denatron P-502RG (containing PEDOT / PSS) manufactured by Nagase ChemteX Corporation as the antistatic agent composition, wire bar # 6 After coating, the film was dried at 120 ° C. for 60 seconds to prepare a protective film for a polarizer with an antistatic layer (antistatic layer thickness: 80 nm). The surface resistance value of the obtained antistatic layer surface was 3.12 × 10 ⁶ Ω / □.

<Preparation of protective film for polarizer with antistatic layer (metal type)>
On the acrylic resin film (thickness: 40 μm) which is the protective film for the polarizer, a tin-based oxide S-1 manufactured by Mitsubishi Materials Electronic Chemicals Co., Ltd., which is an antistatic agent composition, is used with a wire bar # 6. After coating, the film was dried at 120 ° C. for 60 seconds to prepare a protective film for a polarizer with an antistatic layer (antistatic layer thickness: 80 nm). The surface resistance value of the surface of the obtained antistatic layer was 1.21 × 10 ⁶ Ω / □.

<Production of polarizer>
A 75 μm-thick polyvinyl alcohol film (degree of polymerization: 2300, degree of saponification: 99.9%, width: 1000 mm, thickness: 75 μm, manufactured by Kuraray Co., Ltd .: VF-PS7500) in pure water at 30 ° C. The film was stretched to a stretching ratio of 2.5 times while being immersed for 2 seconds.
Subsequently, it dye | stained for 45 second in the iodine aqueous solution (weight ratio: pure water / iodine (I) / potassium iodide (KI) = 100 / 0.01 / 1) of 30 degreeC.
Thereafter, the film was stretched in a 4 wt% boric acid aqueous solution so that the stretching ratio was 5.8 times. After stretching, the film was immersed in pure water for 10 seconds and then dried at 50 ° C. for 3 minutes while maintaining the film tension to obtain a polarizer. This polarizer had a thickness of 25 μm and a moisture content of 14% by weight.

<Preparation of aqueous adhesive solution>
100 parts by weight of polyvinyl alcohol-based resin containing acetoacetyl group (average polymerization degree: 1200, saponification degree: 98.5 mol%, acetoacetyl group modification degree: 5 mol%), 50 parts by weight of methylol melamine, pure water An aqueous solution prepared by dissolving in (water temperature: 30 ° C.) and adjusting the solid content concentration to 3.7% by weight was prepared. An aqueous adhesive solution was prepared by adding 18 parts by weight of an alumina colloid aqueous solution (average particle size: 15 nm, solid content concentration: 10% by weight, positive charge) to 100 parts by weight of the aqueous solution. The viscosity of the adhesive aqueous solution was 9.6 mPa · s. The pH of the adhesive aqueous solution was in the range of 4 to 4.5. This was used as an adhesive aqueous solution.

<Laminated polarizing plate antistatic layer on polarizing plate surface protective film side (surface protecting film side for polarizing plate)>
On the surface opposite to the antistatic layer of the polarizer protective film with an antistatic layer, the adhesive aqueous solution is applied so that the thickness of the adhesive layer after drying is about 55 nm. A protective film for a child was produced.
Then, under the temperature condition of 23 ° C., the polarizer protective film with an adhesive layer is in contact with one surface of the polarizer, and the adhesive layer of the protective film for polarizer with an adhesive layer is in contact with the polarizer. Thus, it laminated | stacked with the roll machine and it was set as the laminated body. The laminate was dried at 70 ° C. for 10 minutes to produce a polarizing plate (1).

<Laminated polarizing plate polarizer on polarizing plate side of polarizing plate surface protective film (polarizer side)>
On the surface of the antistatic layer of the polarizer protective film with an antistatic layer, the adhesive aqueous solution was applied so that the thickness of the adhesive layer after drying was about 55 nm to prepare a protective film with an adhesive layer. .
Then, under the temperature condition of 23 ° C., the polarizer protective film with an adhesive layer is in contact with one surface of the polarizer, and the adhesive layer of the protective film for polarizer with an adhesive layer is in contact with the polarizer. Thus, it laminated | stacked with the roll machine and it was set as the laminated body. The laminate was dried at 70 ° C. for 10 minutes to produce a polarizing plate (2).

<Preparation of a polarizing plate in which a polarizing plate protective film for a polarizing plate having no antistatic layer is laminated on the pressure-sensitive adhesive layer side of the polarizing plate surface protective film>
The thickness of the adhesive layer after drying the aqueous adhesive solution on one side of the protective film for a polarizer not having an antistatic layer is compared with the protective film for a polarizer with an antistatic layer of the polarizing plate (1). It applied so that it might be set to about 55 nm, and produced the protective film for polarizers with an adhesive layer.
Then, under the temperature condition of 23 ° C., the polarizer protective film with an adhesive layer is in contact with one surface of the polarizer, and the adhesive layer of the protective film for polarizer with an adhesive layer is in contact with the polarizer. Thus, it laminated | stacked with the roll machine and it was set as the laminated body. The laminate was dried at 70 ° C. for 10 minutes to produce a polarizing plate (3).

<Surface protective film for polarizing plate to be used>
<E-MASK RP207>
The product name “E-MASK RP207” manufactured by Nitto Denko Corporation having the configuration described in Table 1 was used as the surface protective film for polarizing plate.

<AS3-830>
The product name “AS3-830” manufactured by Fujimori Kogyo Co., Ltd. having the configuration described in Table 1 was used as the surface protective film for the polarizing plate.

<NSA35-H>
As a surface protective film for polarizing plates, the product name “Sanitek NSA35-H” manufactured by Sanei Kaken Co., Ltd. having the configuration described in Table 1 was used.

<Preparation of polarizing plate with surface protective film for polarizing plate>
The surface of the polarizing plate (1) prepared above exposed on the antistatic layer, the surface of the polarizing plate (2) on which the polarizer is exposed, or the polarizing plate without the antistatic layer ( 3) Stick the adhesive layer surface of the polarizing plate surface protective film on the exposed surface of the polarizer protective film in 3) with a roller and leave it at room temperature for 5 minutes, with the polarizing plate surface protective film A polarizing plate was produced.

<Measurement of surface resistance value of antistatic layer surface of polarizing plate>
Measurement was performed in accordance with JIS-K-6911 using a resistivity meter (manufactured by Mitsubishi Chemical Analytic, Hiresta UP MCP-HT450 type) in an atmosphere of temperature 23 ° C. and humidity 50% RH. The applied voltage was 100 V, and the surface resistance value was read 10 seconds after the start of measurement.
In addition, the surface resistance value (Ω / □) measured on the surface of the antistatic layer of the polarizing plate is a state in which the antistatic layer is formed after the antistatic agent composition (solution) is applied to the substrate film and dried. And measured.

In addition, 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 more preferably 1.0 × 10 ^{6 to} 1.0 × 10 ⁷ . The surface protective film for a polarizing plate having an antistatic layer exhibiting a surface resistance value within the above range is, for example, a surface protective film used in processing or transporting an article that dislikes static electricity such as a liquid crystal cell or a semiconductor device. Can be suitably used.

<Measurement of peeling voltage (peeling antistatic property)>
As shown in FIG. 3, the surface protective film 2 for polarizing plates according to each example was cut to a size of 70 mm in width and 130 mm in length, and the release liner was peeled off from the surface of the pressure-sensitive adhesive layer, and then the acrylic previously discharged. A polarizing plate 3 (width: 70 mm, length: 100 mm) according to each example bonded to a plate 31 (Mitsubishi Rayon Co., Ltd., trade name “Acrylite”, thickness: 1 mm, width: 70 mm, length: 100 mm) The sample was pressure-bonded to the surface with a hand roller through an adhesive layer so that one end of the polarizing plate surface protective film 2 protruded from the end of the polarizing plate 20 by 30 mm.
The sample was left in an environment of 23 ° C. × 50% RH for one day, and then set at a predetermined position on a sample fixing base 30 having a height of 20 mm. The end of the surface protective film 1 that protruded 30 mm from the polarizing plate 3 was fixed to an automatic winder (not shown), and was peeled so that the peeling angle was 150 ° and the peeling speed was 30 m / min. A potential measuring device 32 (model “KSD-0103” manufactured by Kasuga Denki Co., Ltd.) in which the potential of the surface of the adherend (polarizing plate) generated at this time is fixed at a height of 100 mm from the center of the polarizing plate 20. The peeling voltage was measured. The measurement was performed in an environment of 23 ° C. and 50% RH. In addition, when the polarizing plate did not have an antistatic layer, instead of the surface of the antistatic layer, the surface potential of the protective film for the polarizer was measured as a peeling band voltage.

  The stripping voltage is a stripping voltage mainly derived from the antistatic layer constituting the surface protective film for polarizing plate of the present invention, and contributes to stripping antistatic properties.

  The stripping voltage (absolute value) of the surface protective film for polarizing plate of the present invention is preferably 0.4 kV or less, more preferably 0.3 kV or less. If the stripping voltage exceeds 0.4 kV, the polarizer arrangement in the polarizing plate is disturbed, which is not preferable. In addition, as evaluation in Table 1, 0.4 kV or less was evaluated as (circle) (good), and the case where it exceeded 0.4 kV was evaluated as x (inferior).

<Contamination resistance>
The surface of the pressure-sensitive adhesive layer of the polarizing plate surface protective film is attached to the surface of the antistatic layer of the polarizing plate, held at 70 ° C. for 120 hours, and then peeled off from the polarizing plate at a peeling rate of 30 m / min. The presence or absence of contamination on the polarizing plate surface was confirmed visually. If the surface of the polarizing plate to which the pressure-sensitive adhesive layer surface of the polarizing plate surface protective film is attached is not an antistatic layer but a protective film for a polarizer, visually check for the presence of contamination on the protective film surface for the polarizer. And confirmed.
As the evaluation, a case where no contamination was observed was evaluated as ◯ (good), and a case where contamination was observed was evaluated as x (inferior).

<Steel wool test (durability)>
Steel wool (# 0000, manufactured by Nippon Steel Wool Co., Ltd.) is attached to a circular jig with a radius of 25 mm, and the surface of the antistatic layer is scratch-resistant (durability) under the condition that the load is 10 g and the length is 10 cm. Sex). The case where the number of scratches visually confirmed was 10 or less was evaluated as ◯ (good), and the number exceeding 10 was evaluated as x (inferior). In addition, durability evaluation was not performed when the surface of the polarizing plate to which the adhesive layer surface of the surface protective film for polarizing plates is stuck is not an antistatic layer.

  Table 1 shows the results of the above-described blending contents, various measurements, and evaluations of the polarizing plate with a surface protective film for polarizing plates according to Examples and Comparative Examples.

注）表１中の「高分子タイプ」とは、帯電防止成分として、導電性高分子（ＰＥＤＯＴ／ＰＳＳ）を使用するものであり、金属タイプとは、帯電防止成分として、スズ系酸化物を使用するものである。
また、表１中の「偏光板用表面保護フィルム側」とは、偏光子とは反対側の帯電防止層の露出した表面に、偏光板用表面保護フィルムの粘着剤層表面が接触する場合を指す。
「偏光子側」とは、偏光子用保護フィルムとは反対側の偏光子の露出した表面に、偏光板用表面保護フィルムの粘着剤層表面が接触する場合を指す。
なお、偏光板の帯電防止層が存在しないため場合は、耐久性を評価をしていない。

Note) “Polymer type” in Table 1 uses a conductive polymer (PEDOT / PSS) as an antistatic component, and metal type uses a tin-based oxide as an antistatic component. It is what you use.
Moreover, the “surface protective film side for polarizing plate” in Table 1 means that the surface of the pressure-sensitive adhesive layer of the surface protective film for polarizing plate is in contact with the exposed surface of the antistatic layer on the side opposite to the polarizer. Point to.
“Polarizer side” refers to the case where the surface of the pressure-sensitive adhesive layer of the polarizing plate surface protective film is in contact with the exposed surface of the polarizer opposite to the protective film for polarizer.
In addition, since the antistatic layer of a polarizing plate does not exist, durability is not evaluated.

  From Table 1, in Example 1, it has peeling antistatic property, stain resistance, and durability (abrasion resistance) by having an antistatic layer in the specific position of a polarizing plate and the surface protective film for polarizing plates. It was confirmed that it was excellent.

  On the other hand, from Table 1, in the comparative example, the position of the antistatic layer constituting the polarizing plate and the antistatic layer constituting the polarizing plate and the surface protective film for the polarizing plate are inferior in peeling antistatic property, When the position of the antistatic layer constituting the polarizing plate is not at a desired position, the durability is inferior, and when the antistatic layer using a metal type antistatic component is also inferior in durability, for the polarizing plate When the antistatic component was contained in the adhesive layer which comprises a surface protection film, it was confirmed that it is inferior to stain resistance.

  The surface protective film which comprises the polarizing plate with a surface protective film disclosed here is used suitably for the polarizing plate used as components, such as a liquid crystal display panel, a plasma display panel (PDP), and an organic electroluminescent (EL) display. be able to.

1: Polarizing plate with surface protective film for polarizing plate 2: Surface protective film for polarizing plate 3: Polarizing plate 10: Antistatic layer 11: Base film 12: Adhesive layer 20: Antistatic layer 21: Protective film for polarizer 22: Polarizer 23: First adhesive layer 24: Phase difference film 30: Sample fixing base 31: Acrylic plate 32: Potential measuring device

Claims (3)

A polarizer and an antistatic agent composition comprising a polarizer protective film on at least one surface of the polarizer, and comprising a conductive polymer on the opposite side of the polarizer protective film in contact with the polarizer A polarizing plate having an antistatic layer formed, and
A base film, and a surface protective film for a polarizing plate having a pressure-sensitive adhesive layer on one side of the base film, and having an antistatic layer on the side opposite to the side in contact with the pressure-sensitive adhesive layer of the base film. A polarizing plate with a surface protective film for a polarizing plate,
Via the pressure-sensitive adhesive layer of the polarizing plate surface protective film, the polarizing plate surface protective film is laminated on the antistatic layer of the polarizing plate,
The pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer does not contain an antistatic component, and a polarizing plate with a surface protective film for a polarizing plate.   The polarizer protective film is formed of at least one resin selected from the group consisting of (meth) acrylic resins, cyclic olefin resins, polyester resins, and polycarbonate resins. The polarizing plate with the surface protective film for polarizing plates of Claim 1. The polarizing plate with a surface protective film for a polarizing plate according to claim 1 or 2, wherein the protective film for a polarizer has an ultraviolet absorbing function.

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