JP2019191282A - Polarizing plate with retardation layer and organic EL display device - Google Patents

Abstract

To provide a polarizing plate with retardation layers, which is less susceptible to cracking of the retardation layers in high temperature environments.SOLUTION: A polarizing plate with retardation layers provided herein comprises a polarizing plate, a first retardation layer, an adhesive layer, and a second retardation layer arranged in the described order, the first and second retardation layers containing a liquid crystal compound. An adhesive constituting the adhesive layer contains 0.05 pt.wt. or more of an isocyanate crosslinking agent per 100 pts.wt. of a base polymer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polarizing plate with a retardation layer and an organic EL display device.

  In recent years, with the widespread use of thin displays, image display devices (organic EL display devices) equipped with organic EL panels have been proposed. The organic EL panel has a highly reflective metal layer, and is likely to cause problems such as external light reflection and background reflection. Therefore, it is known to prevent these problems by providing a polarizing plate with a retardation layer (circular polarizing plate) on the viewing side. However, when a laminate in which two retardation layers containing a liquid crystal compound are bonded with an adhesive is used as a retardation layer of such a polarizing plate with a retardation layer, the retardation layer is cracked in a high temperature environment. May occur.

Japanese Patent No. 3325560

  The present invention has been made to solve the above-described conventional problems, and its main purpose is to provide a polarizing plate with a retardation layer that suppresses the generation of cracks in the retardation layer under a high-temperature environment, and such a polarizing plate. An object of the present invention is to provide an organic EL display device using a polarizing plate with a retardation layer.

The polarizing plate with a retardation layer of the present invention has a polarizing plate, a first retardation layer, a pressure-sensitive adhesive layer, and a second retardation layer in this order, and the first retardation layer and The second retardation layer contains a liquid crystal compound, and the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer contains 0.05 parts by weight or more of an isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer.
In one embodiment, the base polymer is a (meth) acrylic polymer.
In one embodiment, the base polymer includes a carboxyl group-containing monomer as a monomer component.
In one embodiment, the adhesive which comprises the said adhesive layer further contains a ultraviolet absorber.
In one embodiment, the said ultraviolet absorber has 0-3 hydroxyl groups in molecular structure.
In one embodiment, the adhesive which comprises the said adhesive layer further contains the pigment | dye compound which exists in the wavelength range whose maximum absorption wavelength of an absorption spectrum is 380 nm-430 nm.
According to another aspect of the present invention, an organic EL display device is provided. This organic EL display device has the above polarizing plate with a retardation layer.

  According to the present invention, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer disposed between the two retardation layers contains 0.05 parts by weight or more of the isocyanate cross-linking agent with respect to 100 parts by weight of the base polymer. It was possible to realize a polarizing plate with a retardation layer that suppressed the occurrence of cracks in the retardation layer under the environment.

It is a schematic sectional drawing of the polarizing plate with a phase difference layer concerning one embodiment of the present invention.

  Hereinafter, although embodiment of this invention is described, this invention is not limited to these embodiment.

A. FIG. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to one embodiment of the present invention. As illustrated in FIG. 1, the retardation layer-attached polarizing plate 100 includes a polarizing plate 10, a first retardation layer 20, an adhesive layer 30, and a second retardation layer 40 in this order. That is, the first retardation layer 20 and the second retardation layer 40 are laminated via the pressure-sensitive adhesive layer 30. The first retardation layer 20 and the second retardation layer 40 are configured to include a liquid crystal compound. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 30 contains 0.05 parts by weight or more of an isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer. Thereby, generation | occurrence | production of the crack of the 1st phase difference layer 20 and / or the 2nd phase difference layer 30 in a high temperature environment can be suppressed. Another pressure-sensitive adhesive layer 50 may be laminated on the opposite side of the second retardation layer 40 from the pressure-sensitive adhesive layer 30. Thereby, for example, bonding to an organic EL panel becomes easy.

  The base polymer of the pressure-sensitive adhesive is preferably a (meth) acrylic polymer. The base polymer of the pressure-sensitive adhesive preferably contains a carboxyl group-containing monomer as a monomer component. In one embodiment, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 30 further includes an ultraviolet absorber. In this case, the ultraviolet absorber preferably has 0 to 3 hydroxyl groups in the molecular structure. Moreover, in one embodiment, the adhesive which comprises the adhesive layer 30 further contains the pigment | dye compound which exists in the wavelength range whose maximum absorption wavelength of an absorption spectrum is 380 nm-430 nm. According to said structure, the ultraviolet-ray absorption function can be provided to the adhesive layer 30, and this suppresses deterioration of the organic EL element at the time of using a polarizing plate with a phase difference layer for an organic EL display apparatus. Can do.

  Hereinafter, each layer which comprises the polarizing plate 100 with a phase difference layer is demonstrated in detail.

B. Polarizing plate The polarizing plate 10 typically has a polarizer, a first protective layer disposed on one side of the polarizer, and a second protective layer disposed on the other side of the polarizer. . The polarizer is typically an absorptive polarizer. One of the first protective layer and the second protective layer may be omitted.

B-1. Polarizer Any appropriate polarizer may be adopted as the polarizer. For example, the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.

  Specific examples of polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films. In addition, there may be mentioned polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products. Preferably, a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.

  The dyeing with iodine is performed, for example, by immersing a PVA film in an iodine aqueous solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye | stain after extending | stretching. If necessary, the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.

  As a specific example of a polarizer obtained by using a laminate, a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin Examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate. For example, a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it. A PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain. In the present embodiment, stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Furthermore, the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution. The obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate. Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.

  The thickness of the polarizer is, for example, 1 μm to 35 μm. In one embodiment, the thickness of the polarizer is preferably 1 μm to 15 μm, more preferably 3 μm to 10 μm, and particularly preferably 3 μm to 8 μm. When the thickness of the polarizer is in such a range, curling during heating can be satisfactorily suppressed, and good appearance durability during heating can be obtained.

B-2. Protective layer The first and second protective layers are formed of any suitable protective film that can be used as a film for protecting the polarizer. Specific examples of the material that is the main component of the protective film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials. And transparent resins such as those based on polystyrene, polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate. Further, thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included. In addition to this, for example, a glassy polymer such as a siloxane polymer is also included. Moreover, the polymer film as described in Unexamined-Japanese-Patent No. 2001-343529 (WO01 / 37007) can also be used. As a material for this film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain For example, a resin composition having an alternating copolymer composed of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned. The polymer film can be, for example, an extruded product of the resin composition.

  The thickness of the protective film is preferably 10 μm to 100 μm. The protective film may be laminated to the polarizer via an adhesive layer (specifically, an adhesive layer or an adhesive layer), or may be adhered to the polarizer (without an adhesive layer). Good. The adhesive layer is formed of any appropriate adhesive. As an adhesive agent, the water-soluble adhesive agent which has a polyvinyl alcohol-type resin as a main component is mentioned, for example. The water-soluble adhesive mainly composed of a polyvinyl alcohol-based resin can preferably further contain a metal compound colloid. The metal compound colloid can be one in which metal compound fine particles are dispersed in a dispersion medium, and can be electrostatically stabilized due to mutual repulsion of the same kind of charge of the fine particles, and can have permanent stability. . The average particle size of the fine particles forming the metal compound colloid can be any appropriate value as long as it does not adversely affect the optical properties such as polarization properties. Preferably they are 1 nm-100 nm, More preferably, they are 1 nm-50 nm. This is because the fine particles can be uniformly dispersed in the adhesive layer, the adhesion can be ensured, and the nick can be suppressed. The “knic” refers to a local uneven defect generated at the interface between the polarizer and the protective film. The pressure-sensitive adhesive layer is composed of any appropriate pressure-sensitive adhesive.

C. Retardation layer As described above, the first and second retardation layers include a liquid crystal compound. Typically, the first and second retardation layers can be constituted by an alignment solidified layer of a liquid crystal composition containing a liquid crystal compound. In the present specification, the “alignment solidified layer” refers to a layer in which a liquid crystal compound is aligned in a predetermined direction in the layer and the alignment state is fixed. The alignment solidified layer of the liquid crystal compound is subjected to an alignment treatment on the surface of a predetermined substrate, and a coating liquid containing the liquid crystal compound is applied to the surface to align the liquid crystal compound in a direction corresponding to the alignment treatment, It can be formed by fixing the alignment state. In one embodiment, the substrate is any suitable resin film, and the alignment solidified layer formed on the substrate can be transferred to the surface of the other layer constituting the polarizing plate with a retardation layer. . Specific examples of the liquid crystal compound and details of the method for forming the alignment solidified layer are described in JP-A No. 2006-163343. The description in this publication is incorporated herein by reference.

  In one embodiment, the in-plane retardation Re (550) of the first retardation layer is preferably 200 nm to 300 nm, and the in-plane retardation Re (550) of the second retardation layer is preferably Is 100 nm to 150 nm. Therefore, in this case, the first retardation layer can function as a λ / 2 plate, and the second retardation layer can function as a λ / 4 plate. The angle formed by the absorption axis of the polarizer and the slow axis of the first retardation layer is preferably 5 ° to 25 °, and particularly preferably about 15 °. The angle formed by the absorption axis of the polarizer and the slow axis of the second retardation layer is preferably 65 ° to 85 °, and particularly preferably about 75 °. In another embodiment, the in-plane retardation Re (550) of the first retardation layer is preferably 120 nm to 160 nm, and the second retardation layer has a refractive index ellipsoid of nz> nx = ny. Satisfy the relationship. Therefore, in this case, the first retardation layer can function as a λ / 4 plate, and the second retardation layer can function as a so-called positive C plate. The angle formed between the absorption axis of the polarizer and the slow axis of the first retardation layer is preferably 39 ° to 51 °, particularly preferably about 45 °.

C-1. First Retardation Layer In one embodiment, the first retardation layer may be constituted by an alignment solidified layer of a liquid crystalline composition containing a discotic liquid crystal compound aligned substantially vertically. In the present specification, the “discotic liquid crystal compound” has a disc-shaped mesogenic group in the molecular structure, and 2 to 8 side differences in the mesogenic group are radially formed by an ether bond or an ester bond. This is what is connected. The thickness of the first retardation layer can be set so as to obtain a desired in-plane retardation, and is preferably 1 μm to 20 μm, more preferably 1 μm to 12 μm. The liquid crystalline composition containing the above discotic liquid crystal compound is not particularly limited as long as it contains a discotic liquid crystal compound and exhibits liquid crystallinity. The content of the discotic liquid crystal compound in the liquid crystal composition is preferably 40 parts by weight or more and less than 100 parts by weight with respect to 100 parts by weight of the total solid content of the liquid crystal composition. The retardation film comprising an alignment solidified layer of a liquid crystalline composition containing the substantially vertically aligned discotic liquid crystal compound can be obtained by the method described in JP-A-2001-56411.

  In another embodiment, the first retardation layer may be constituted by an alignment solidified layer in which rod-like liquid crystal compounds are aligned in a state of being aligned in the slow axis direction of the retardation layer (homogeneous alignment). Examples of the liquid crystal compound include a liquid crystal compound (nematic liquid crystal) whose liquid crystal phase is a nematic phase. As such a liquid crystal compound, for example, a liquid crystal polymer or a liquid crystal monomer can be used. The liquid crystal compound may exhibit liquid crystallinity either lyotropic or thermotropic. When the liquid crystal compound is a liquid crystal monomer, the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer. This is because the alignment state of the liquid crystal monomer can be fixed by polymerizing or crosslinking the liquid crystal monomer. Any appropriate liquid crystal monomer can be adopted as the liquid crystal monomer. For example, polymerizable mesogenic compounds described in JP-T-2002-533742 (WO00 / 37585), EP358208 (US52111877), EP66137 (US4388453), WO93 / 22397, EP02661712, DE195504224, DE44081171, and GB2280445 can be used. Specific examples of such a polymerizable mesogenic compound include, for example, the trade name LC242 from BASF, the trade name E7 from Merck, and the trade name LC-Silicon-CC3767 from Wacker-Chem. The thickness of the first retardation layer can be set so as to obtain a desired in-plane retardation, and is preferably 1 μm to 10 μm, more preferably 1 μm to 6 μm.

C-2. Second Retardation Layer The second retardation layer that can function as a λ / 4 plate can be formed by the materials and methods described in the above section C-1 for the first retardation layer.

  The second retardation layer that can function as a positive C plate can be composed of any appropriate liquid crystal compound as long as the refractive index ellipsoid satisfies the relationship of nz> nx = ny. Details of such a liquid crystal compound are described in Japanese Patent No. 4186980 and Japanese Patent No. 6055569. The description in this publication is incorporated herein by reference. In one embodiment, the second retardation layer has the following chemical formula (I) (numbers 65 and 35 in the formula indicate mol% of the monomer unit, and are represented by a block polymer body for convenience: weight average) A side chain type liquid crystal polymer represented by a molecular weight of 5000) and a polymerizable liquid crystal exhibiting a nematic liquid crystal phase.

D. Adhesive Layer As described above, the adhesive contains 0.05 parts by weight or more of an isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer, and preferably further contains an ultraviolet absorber and / or a dye compound.

  The thickness of the pressure-sensitive adhesive layer is, for example, 2 μm to 50 μm, preferably 5 μm to 30 μm. The gel fraction of the pressure-sensitive adhesive layer is preferably 40% to 95%, more preferably 50% to 95%, still more preferably 65% to 93%, and particularly preferably 80% to 93%. Yes, most preferably 85 to 93%. When the gel fraction of the pressure-sensitive adhesive layer is small, the cohesive force is inferior and there may be a problem in workability and handling properties. Further, the gel fraction immediately after forming the pressure-sensitive adhesive layer is preferably 60% or more, more preferably 63% or more, and 66% or more from the viewpoint of preventing appearance defects such as glue marks. It is more preferable that it is 70% or more.

D-1. Base polymer Any appropriate polymer can be adopted as the base polymer as long as the required adhesiveness and tackiness can be exhibited. Specific examples of the base polymer include (meth) acrylic polymers and rubber polymers. Preferably, the base polymer is a (meth) acrylic polymer.

  The (meth) acrylic polymer contains alkyl (meth) acrylate as a main component as a monomer unit. Examples of the alkyl (meth) acrylate include those having a linear or branched alkyl group having 1 to 24 carbon atoms at the ester terminal. Alkyl (meth) acrylate can be used individually by 1 type or in combination of 2 or more types. “Alkyl (meth) acrylate” refers to alkyl acrylate and / or alkyl methacrylate.

  The alkyl (meth) acrylate having an alkyl group having 1 to 24 carbon atoms at the ester terminal is preferably 40% by weight or more based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer, More preferably, it is more than 60% by weight.

  The monomer component may contain a copolymerization monomer other than alkyl (meth) acrylate as a monofunctional monomer component. A copolymerization monomer can be used as the remainder of the alkyl (meth) acrylate in a monomer component. As the copolymerization monomer, for example, a cyclic nitrogen-containing monomer may be included. As said cyclic nitrogen containing monomer, what has a polymerizable functional group which has unsaturated double bonds, such as a (meth) acryloyl group or a vinyl group, and has a cyclic nitrogen structure can be especially used without a restriction | limiting. The cyclic nitrogen structure preferably has a nitrogen atom in the cyclic structure. The content of the cyclic nitrogen-containing monomer is preferably 0.5 to 50% by weight, more preferably 0.5 to 40% by weight based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer. %, Even more preferably 0.5 to 30% by weight.

  The monomer component that forms the (meth) acrylic polymer may include other functional group-containing monomers. Examples of such a monomer include a carboxyl group-containing monomer and a monomer having a cyclic ether group. When the carboxyl group-containing monomer is contained, the content is preferably 0.05 to 10% by weight, more preferably 0.1 to 8% by weight, and further preferably 0.2 to 6% by weight. . By including a carboxyl group-containing monomer, the gel fraction of the pressure-sensitive adhesive layer can be set to a value within a preferable range, and as a result, generation of cracks in the retardation layer can be suppressed.

  The monomer component may include a hydroxyl group-containing monomer. As the hydroxyl group-containing monomer, a monomer having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group and having a hydroxyl group can be used without particular limitation. The content of the hydroxyl group-containing monomer is preferably 0.08% by weight or more based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer, from the viewpoint of enhancing the adhesive force and cohesive force. More preferably, it is 0.3% by weight or more, and further preferably 1% by weight or more. On the other hand, the upper limit of the content of the hydroxyl group-containing monomer is preferably 30% by weight, more preferably 27% by weight, based on the total amount of the monofunctional monomer component forming the (meth) acrylic polymer, More preferably, it is 25% by weight. If the amount of the hydroxyl group-containing monomer is too large, the pressure-sensitive adhesive layer becomes hard, the adhesive force may be reduced, and the viscosity of the pressure-sensitive adhesive may become too high.

  In addition to the above-mentioned monofunctional monomer, the monomer component that forms the (meth) acrylic polymer contains any appropriate multifunctional monomer as necessary to adjust the cohesive strength of the pressure-sensitive adhesive. can do.

  As the (meth) acrylic polymer, those having a weight average molecular weight in the range of 500,000 to 3,000,000 are usually used. In view of durability, particularly heat resistance, it is preferable to use those having a weight average molecular weight of 700,000 to 2,700,000. Furthermore, it is preferable that it is 800,000-2.5 million. A weight average molecular weight of less than 500,000 is not preferable in terms of heat resistance. On the other hand, if the weight average molecular weight is more than 3 million, a large amount of a diluting solvent is required to adjust the viscosity to be suitable for coating, which is not preferable. The weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.

  As a method for producing the (meth) acrylic polymer, any appropriate method such as radiation polymerization such as solution polymerization and ultraviolet (UV) polymerization, various radical polymerizations such as bulk polymerization and emulsion polymerization can be employed. Further, the (meth) acrylic polymer obtained may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.

  When a (meth) acrylic polymer is produced by radical polymerization, polymerization can be carried out by appropriately adding a polymerization initiator, a chain transfer agent, an emulsifier and the like used for radical polymerization to the monomer component. The polymerization initiator, chain transfer agent, emulsifier and the like used for radical polymerization are not particularly limited and can be appropriately selected and used. In addition, the weight average molecular weight of a (meth) acrylic-type polymer can be controlled by the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, and the usage-amount is suitably adjusted according to these kinds.

  When the (meth) acrylic polymer is produced by radiation polymerization, it can be produced by polymerizing the monomer component by irradiating the monomer component with radiation such as an electron beam or ultraviolet rays (UV). Among these, ultraviolet polymerization is preferable. When performing the ultraviolet polymerization, it is preferable to contain a photopolymerization initiator in the monomer component because of the advantage that the polymerization time can be shortened.

  Although it does not specifically limit as a photoinitiator, It is preferable that it is a photoinitiator which has an absorption band in wavelength 400nm or more. As such a photopolymerization initiator, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide (manufactured by BASF, product name “Irgacure 819”), 2,4,6-trimethylbenzoyl-diphenyl-phos Examples include fin oxide (manufactured by BASF, “LUCIRIN TPO”).

  The photopolymerization initiator can contain a photopolymerization initiator having an absorption band at a wavelength of less than 400 nm. Such a photopolymerization initiator is not particularly limited as long as it generates radicals by ultraviolet rays and initiates photopolymerization and has an absorption band at a wavelength of less than 400 nm. Any agent can be suitably used. For example, benzoin ether photopolymerization initiator, acetophenone photopolymerization initiator, α-ketol photopolymerization initiator, photoactive oxime photopolymerization initiator, benzoin photopolymerization initiator, benzyl photopolymerization initiator, benzophenone A photopolymerization initiator, a ketal photopolymerization initiator, a thioxanthone photopolymerization initiator, an acylphosphine oxide photopolymerization initiator, or the like can be used.

D-2. Isocyanate crosslinking agent In the pressure-sensitive adhesive, the content of the isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer is preferably 0.1 to 12 parts by weight. The lower limit of the content of the isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer is preferably 0.5 parts by weight, more preferably 1 part by weight, and particularly preferably 2 parts by weight. Thereby, generation | occurrence | production of the crack in a phase difference layer in a high temperature environment can be suppressed effectively. Moreover, the upper limit of the content of the isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer is preferably 8 parts by weight, more preferably 5 parts by weight. Thereby, the cloudiness of an adhesive layer can be suppressed.

  An isocyanate cross-linking agent refers to a compound having two or more isocyanate groups (including isocyanate-regenerating functional groups in which isocyanate groups are temporarily protected by blocking agents or quantification) in one molecule. Examples of the isocyanate crosslinking agent include aromatic isocyanates such as tolylene diisocyanate and xylene diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, and aliphatic isocyanates such as hexamethylene diisocyanate. Tolylene diisocyanate is preferable. This is because the gel fraction of the pressure-sensitive adhesive layer can be increased.

  More specifically, for example, lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate, alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate, 2,4-tolylene diisocyanate, Aromatic diisocyanates such as 4,4′-diphenylmethane diisocyanate, xylene diisocyanate, polymethylene polyphenyl isocyanate, trimethylolpropane / tolylene diisocyanate trimer adduct (product name “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd.) , Trimethylolpropane / hexamethylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., product name “Coronate HL”), hexame Isocyanurate of diisocyanate (product name “Coronate HX” manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane adduct of xylene diisocyanate (product name “D110N” manufactured by Mitsui Chemicals), hexa Trimethylolpropane adduct of methylene diisocyanate (product name “D160N” manufactured by Mitsui Chemicals, Inc.); polyether polyisocyanate, polyester polyisocyanate, and adducts of these with various polyols, isocyanurate bond, burette bond, Polyisocyanate polyfunctionalized by allophanate bond etc. is mentioned.

D-3. Ultraviolet absorber Any appropriate ultraviolet absorber can be used as the ultraviolet absorber. The ultraviolet absorber preferably has 0 to 3 hydroxyl groups in the molecular structure. Specific examples include triazine UV absorbers, benzotriazole UV absorbers, benzophenone UV absorbers, oxybenzophenone UV absorbers, salicylic acid ester UV absorbers, and cyanoacrylate UV absorbers. These can be used singly or in combination of two or more. Among these, triazine-based UV absorbers and benzotriazole-based UV absorbers are preferable, triazine-based UV absorbers having 2 or less hydroxyl groups in one molecule, and benzones having one benzotriazole skeleton in one molecule. It is at least one ultraviolet absorber selected from the group consisting of triazole-based ultraviolet absorbers, has good solubility in monomers used for forming an acrylic pressure-sensitive adhesive composition, and has a wavelength of around 380 nm This is preferable because of its high ultraviolet absorption ability. An ultraviolet absorber may be used independently and may mix and use 2 or more types.

  The content of the ultraviolet absorber is preferably 0.1 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, and further preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the base polymer. Parts by weight, particularly preferably 0.5 to 3 parts by weight.

  The maximum absorption wavelength of the absorption spectrum of the ultraviolet absorber is preferably in the wavelength region of 300 nm to 400 nm, more preferably in the wavelength region of 320 nm to 380 nm. The maximum absorption wavelength can be measured using an ultraviolet-visible spectrophotometer.

  As the ultraviolet absorbent product, commercially available products can be suitably used, and examples thereof include Tinosorb S (manufactured by BASF) and Seesorb 106 (manufactured by Sipro Kasei Co., Ltd.).

D-4. As mentioned above, the dye compound is present in the wavelength region of the absorption spectrum having a maximum absorption wavelength of 380 nm to 430 nm. The maximum absorption wavelength of the absorption spectrum of the dye compound is preferably in the wavelength region of 380 nm to 420 nm. By using a combination of such a dye compound and an ultraviolet absorber, light in a region (wavelength 380 nm to 430 nm) that does not affect the light emission of the organic EL element can be sufficiently absorbed, and the light emission of the organic EL element. The region (longer wavelength side than 430 nm) can be sufficiently transmitted.

The full width at half maximum of the dye compound is preferably 80 nm or less, more preferably 5 nm to 70 nm, and still more preferably 10 nm to 60 nm. Thereby, the light of the long wavelength side more than 430 nm can fully be permeate | transmitted, fully absorbing the light of the area | region which does not influence the light emission of an organic EL element. The full width at half maximum of the dye compound can be measured from the transmission absorption spectrum of the solution of the dye compound under the following measurement conditions using an ultraviolet-visible spectrophotometer (manufactured by Hitachi High-Tech Science Co., Ltd., product name “U-4100”). it can. Typically, from the spectrum measured by adjusting the concentration so that the absorbance at the maximum absorption wavelength is 1.0, the wavelength interval (full width at half maximum) between two points at 50% of the peak value is expressed as the dye compound. The full width at half maximum.
(Measurement condition)
Solvent: Toluene or chloroform Cell: Quartz cell Optical path length: 10 mm

  The dye compound is not particularly limited as long as it is a compound having a maximum absorption wavelength in the absorption spectrum in the above wavelength region. Examples of the dye compound include an organic dye compound and an inorganic dye compound. Among these, from the viewpoint of maintaining dispersibility and transparency in a resin component such as a base polymer, the organic dye compound is used. Is preferred.

  Examples of organic dye compounds include azomethine compounds, indole compounds, cinnamic acid compounds, pyrimidine compounds, porphyrin compounds, and polymethine compounds.

  What is marketed can be used suitably as an organic pigment | dye compound, Specifically, as an indole-type compound, BONASORB UA3911 (Orient Chemical Industries Ltd. make, absorption spectrum maximum absorption wavelength: 398nm, half Value range: 48 nm), BONASORB UA3912 (manufactured by Orient Chemical Industry Co., Ltd., maximum absorption wavelength of absorption spectrum: 386 nm, half-value width: 53 nm), and cinnamic acid compounds as SOM-5-0106 (manufactured by Orient Chemical Industry Co., Ltd.) Absorption spectrum maximum absorption wavelength: 416 nm, half-value width: 50 nm), as pyrimidine compounds, FDB-009 (manufactured by Yamada Chemical Co., Ltd., absorption spectrum maximum absorption wavelength: 394 nm, half-value width: 43 nm), porphyrin series As a compound, FDB-00 1 (manufactured by Yamada Chemical Co., Ltd., absorption spectrum maximum absorption wavelength: 420 nm, half width: 14 nm), as a polymethine compound, DAA247 (manufactured by Yamada Chemical Industry Co., Ltd., absorption spectrum maximum absorption wavelength: 389 nm, half width: 49.5 nm).

D-5. Other Components The pressure-sensitive adhesive composition may contain other components such as a silane coupling agent, an antioxidant, an anti-aging agent, and a plasticizer as necessary. Examples of the antioxidant include phenol-based, phosphorus-based, sulfur-based, and amine-based antioxidants. Examples of the silane coupling agent include epoxy group-containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, amino group-containing silane coupling agents such as 3-aminopropyltrimethoxysilane, and 3-acryloxypropyl. (Meth) acrylic group-containing silane coupling agents such as trimethoxysilane, isocyanate group-containing silane coupling agents such as 3-isocyanatopropyltriethoxysilane, and acetoacetyl group-containing silane coupling agents.

E. Organic EL Display Device The polarizing plate with a retardation layer described in the above items A to D can be used in an image display device. Therefore, the present invention also includes an image display device using such an optical laminate. Typical examples of the image display device include a liquid crystal display device and an organic electroluminescence (EL) display device. An image display device (organic EL display device) according to an embodiment of the present invention includes the optical layered body described in the items A to D.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by these Examples. In addition, the measuring method of each characteristic is as follows.
(1) Thickness The thickness of the retardation layer was measured using an interference film thickness meter (MCPD2000, manufactured by Otsuka Electronics Co., Ltd.). Moreover, the thickness of layers other than a phase difference layer was measured using the digital micrometer (The Anritsu Co., Ltd. make, KC-351C).
(2) Retardation value Refractive indexes nx, ny and nz of the retardation layer are measured by an automatic birefringence measuring device (manufactured by Oji Scientific Instruments, automatic birefringence meter KOBRA-WPR), and in-plane retardation Re and The thickness direction retardation Rth was calculated.
(3) Transmittance of pressure-sensitive adhesive layer The separator of each pressure-sensitive adhesive layer obtained in Examples and Comparative Examples was peeled off, and the pressure-sensitive adhesive layer was attached to a measuring jig, and a spectrophotometer (manufactured by Hitachi High-Technologies Corporation) , Product name “U4100”). As for the transmittance, the transmittance in a wavelength range of 300 nm to 450 nm was measured.
(4) Gel fraction of the pressure-sensitive adhesive layer 0.2 g of each pressure-sensitive adhesive layer (pressure-sensitive adhesive composition) obtained in Examples and Comparative Examples, and the weight of the fluororesin (manufactured by Nitto Denko Corporation, product) After wrapping in the name “TEMISH NTF-1122”, weight: Wa) and binding the adhesive so that it does not leak, the weight (Wb) was measured and placed in a sample bottle. 40 cc of ethyl acetate was added and left for 7 days. Thereafter, the fluororesin was taken out, dried on an aluminum cup at 130 ° C. for 2 hours, the weight (Wc) of the fluororesin including the sample was measured, and the gel fraction was determined by the following formula (I).
Formula (I): Gel fraction = (Wc−Wa) / (Wb−Wa) × 100 (% by weight)
The gel fraction was measured after the pressure-sensitive adhesive layer was formed and left at room temperature (23 ° C.) for 1 week.

<Production Example 1>
(Preparation of polarizing plate)
A long roll of polyvinyl alcohol film (product name “PE3000” manufactured by Kuraray Co., Ltd.) having a thickness of 30 μm is simultaneously swollen and dyed while being uniaxially stretched in the longitudinal direction so as to be 5.9 times in the longitudinal direction by a roll stretching machine. A cross-linking and cleaning treatment was performed, and finally a drying treatment was performed to produce a polarizer having a thickness of 12 μm.
Specifically, the swelling treatment was stretched 2.2 times while being treated with pure water at 20 ° C. Next, the dyeing treatment is performed in an aqueous solution at 30 ° C. in which the weight ratio of iodine and potassium iodide is 1: 7 and the iodine concentration is adjusted so that the transmittance of the produced polarizing film is 45.0%. The film was stretched 1.4 times. Furthermore, the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C. The boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight. In the second-stage crosslinking treatment, the film was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C. The boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight. In addition, the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C. The potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight. Finally, the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer.
A TAC film (product name: KC2UA thickness: 25 μm) manufactured by Konica Minolta Co., Ltd. and an HC layer on one side of the TAC film on both sides of the obtained polarizer via a polyvinyl alcohol adhesive, respectively. A TAC film (thickness: 32 μm) was bonded to obtain polarizing plate 1 having protective films bonded to both sides of the polarizer.

ポリエチレンテレフタレート（ＰＥＴ）フィルム（厚み３８μｍ）の表面を、ラビング布を用いてラビングし、配向処理を施した。配向処理の条件は、ラビング回数（ラビングロール個数）は１、ラビングロール半径ｒは７６．８９ｍｍ、ラビングロール回転数ｎｒは１５００ｒｐｍ、フィルム搬送速度ｖは８３ｍｍ／ｓｅｃであり、ラビング強度ＲＳおよび押し込み量Ｍは表１に示すような５種類の条件（ａ）〜（ｅ）で行った。 <Production Example 2>
(Preparation of retardation layer A)
10 g of a polymerizable liquid crystal exhibiting a nematic liquid crystal phase (manufactured by BASF, product name “Paliocolor LC242”, represented by the following formula) and a photopolymerization initiator (product name “Ciba Specialty Chemicals, product name”) 3 g of Irgacure 907 ") was dissolved in 40 g of toluene to prepare a liquid crystal composition (coating solution).

The surface of a polyethylene terephthalate (PET) film (thickness 38 μm) was rubbed with a rubbing cloth and subjected to orientation treatment. The conditions for the alignment treatment are as follows: rubbing frequency (number of rubbing rolls) is 1, rubbing roll radius r is 76.89 mm, rubbing roll rotation speed nr is 1500 rpm, film transport speed v is 83 mm / sec, rubbing strength RS and indentation amount M was performed under five conditions (a) to (e) as shown in Table 1.

The direction of the orientation treatment was set to a −75 ° direction when viewed from the viewing side with respect to the direction of the absorption axis of the polarizer when being attached to the polarizing plate. The liquid coating compound was aligned by applying the coating liquid onto the alignment-treated surface with a bar coater and heating and drying at 90 ° C. for 2 minutes. Under the conditions (a) to (c), the alignment state of the liquid crystal compound was very good. Under the conditions (d) and (e), a slight disturbance occurred in the alignment of the liquid crystal compound, but the level was not problematic for practical use. The liquid crystal layer thus formed was irradiated with 1 mJ / cm ² of light using a metal halide lamp to cure the liquid crystal layer, thereby forming a retardation layer A on the PET film. The thickness of the retardation layer A was 2 μm, and the in-plane retardation Re was 270 nm. Furthermore, the retardation layer A had a refractive index distribution of nx> ny = nz.

<Production Example 3>
(Preparation of retardation layer B)
The surface of a polyethylene terephthalate (PET) film (thickness 38 μm) was rubbed with a rubbing cloth and subjected to orientation treatment. The direction of the orientation treatment was set to a −15 ° direction when viewed from the viewing side with respect to the direction of the absorption axis of the polarizer when pasted to the polarizing plate. A liquid crystal coating liquid similar to that described above was applied to the surface subjected to the alignment treatment, and the liquid crystal was aligned and cured in the same manner as described above to form a retardation layer B on the PET film. The thickness of the retardation layer B was 1.2 μm, and the in-plane retardation Re was 140 nm. Further, the retardation layer B had a refractive index distribution of nx> ny = nz.

[Example 1]
1. Preparation of pressure-sensitive adhesive layer <Preparation of (meth) acrylic polymer (1)>
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, 99 parts of butyl acrylate, 1.0 part of 4-hydroxybutyl acrylate and 2,2′-azobisisobutyronitrile 0.3 After adding a part with ethyl acetate and making it react at 60 degreeC under nitrogen gas stream for 4 hours, ethyl acetate was added to the reaction liquid, and the solution (solid content concentration 30) containing a weight average molecular weight 1.6 million. %).
<Preparation of pressure-sensitive adhesive composition>
Based on the above acrylic polymer as a base polymer, 0.3 part of benzoyl peroxide (manufactured by NOF Corporation, product name “Nyper BMT”) and 100 parts of trimethylol per 100 parts of solid content of the acrylic polymer solution Propane xylene diisocyanate (Mitsui Chemicals, product name “Takenate D110N”) and 0.2 part silane coupling agent (Soken Chemicals, product name “A-100”, acetoacetyl group-containing silane coupling A pressure-sensitive adhesive composition A (solution) was obtained.
<Preparation of adhesive layer>
The pressure-sensitive adhesive composition A was applied to a separator made of a polyester film surface-treated with a silicone release agent and heat-treated at 155 ° C. for 3 minutes to obtain a pressure-sensitive adhesive layer having a thickness of 20 μm.
2. Preparation of Polarizing Plate with Retardation Layer The TAC film surface of the polarizing plate and the retardation layer A are UV curable so that the angle between the absorption axis of the polarizing plate and the slow axis of the retardation layer A is 75 °. It bonded together through the adhesive agent. Next, by laminating the retardation layer A and the retardation layer B through the pressure-sensitive adhesive layer so that the angle between the absorption axis of the polarizing plate and the slow axis of the retardation layer B is 15 °, A polarizing plate with a retardation layer was obtained.

[Example 2]
As a UV absorber, 2,4-bis-[{4- (4-ethylhexyloxy) -4-hydroxy} -phenyl] -6- (4-methoxyphenyl) -1,3,5-triazine (BASF Japan Ltd.) A pressure-sensitive adhesive composition B was obtained in the same manner as in Example 1 except that 2 parts by weight (solid content weight) of the product name “Tinosorb S” and “a1” in Table 1 were added.
Except having used the said adhesive composition B, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and a phase difference layer.

[Example 3]
A pressure-sensitive adhesive composition C was obtained in the same manner as in Example 2, except that the amount of trimethylolpropane xylene diisocyanate added was 0.5 parts with respect to 100 parts of the solid content of the acrylic polymer solution.
Except having used the said adhesive composition C, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 4]
2 weights of 2,2 ′, 4,4′-tetrahydroxybenzophenone (manufactured by Cypro Kasei Co., Ltd., product name “SeeSorb106”, “a2” in Table 1) is used as the ultraviolet absorber instead of the ultraviolet absorber a1. A pressure-sensitive adhesive composition D was obtained in the same manner as in Example 3 except that part (solid content weight) was added.
Except having used the said adhesive composition D, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 5]
The addition amount of the ultraviolet absorber a1 was 3 parts by weight, and a pyrimidine compound (manufactured by Yamada Chemical Co., Ltd., product name “FDB-009”, “b1” in Table 1) as a pigment compound was 3% by weight. A pressure-sensitive adhesive composition E was obtained in the same manner as in Example 3 except that part (solid weight) was added.
Except having used the said adhesive composition E, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and a phase difference layer.

[Example 6]
The addition amount of the ultraviolet absorber a2 was 3 parts by weight, and 2 parts by weight of an indole compound (made by Orient Chemical Industry Co., Ltd., product name “BONASORB UA3912”, “b3” in Table 1) as a pigment compound) A pressure-sensitive adhesive composition F was obtained in the same manner as in Example 4 except that (solid content weight) was added.
Except having used the said adhesive composition F, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and a phase difference layer.

[Example 7]
In a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirring device, 95 parts of butyl acrylate, 4.9 parts of acrylic acid, 0.1 part of 2-hydroxyethyl acrylate, and dibenzoyl peroxide are monomers (Solid content) 0.3 parts per 100 parts was added with ethyl acetate and reacted at 60 ° C. for 7 hours under a nitrogen gas stream. Then, ethyl acetate was added to the reaction solution to give a weight average molecular weight of 2.2 million. A solution containing an acrylic polymer (solid content concentration: 30% by weight) was obtained.
Using the acrylic polymer as a base polymer, 0.5 part of trimethylolpropane tolylene diisocyanate (product name “Coronate L”, manufactured by Nippon Polyurethane Co., Ltd.) per 100 parts of solid content of the acrylic polymer solution, and 0.075 part Γ-glycidoxypropylmethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KBM-403”) and 3 parts by weight of an ultraviolet absorber a1 were blended to obtain an adhesive composition G.
Except having used the said adhesive composition G, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and a phase difference layer.

[Example 8]
A pressure-sensitive adhesive composition H was obtained in the same manner as in Example 7 except that 3 parts by weight (solid weight) of the dye compound b1 was added.
Except having used the said adhesive composition H, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 9]
A pressure-sensitive adhesive composition I was obtained in the same manner as Example 7 except that 3 parts by weight (solid content weight) of the dye compound b3 was added.
Except having used the said adhesive composition I, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 10]
Adhesive in the same manner as in Example 7 except that 3 parts by weight (solid weight) of polymethine compound (manufactured by Yamada Chemical Co., Ltd., product name “DAA247”, “b2” in Table 1) was added as the dye compound. Agent composition J was obtained.
Except having used the said adhesive composition J, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 11]
A pressure-sensitive adhesive composition K was obtained in the same manner as in Example 10 except that the amount of trimethylolpropane tolylene diisocyanate added was 0.8 parts relative to 100 parts of the solid content of the acrylic polymer solution.
Except having used the said adhesive composition K, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 12]
A pressure-sensitive adhesive composition L was obtained in the same manner as in Example 10 except that the amount of trimethylolpropane tolylene diisocyanate added was 2.5 parts with respect to 100 parts of the solid content of the acrylic polymer solution.
Except having used the said adhesive composition L, it carried out similarly to Example 1, and obtained the adhesive layer and the polarizing plate with retardation layer.

[Example 13]
A pressure-sensitive adhesive composition M was obtained in the same manner as in Example 10 except that the amount of trimethylolpropane tolylene diisocyanate added was 10 parts with respect to 100 parts of the solid content of the acrylic polymer solution.
Except having used the said adhesive composition M, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and a phase difference layer.

[Comparative Example 1]
A pressure-sensitive adhesive composition N was obtained in the same manner as in Example 2, except that the amount of trimethylolpropane xylene diisocyanate added was 0.02 part with respect to 100 parts of the solid content of the acrylic polymer solution.
Except having used the said adhesive composition N, it carried out similarly to Example 1, and obtained the polarizing plate with an adhesive layer and retardation layer.

(Evaluation)
The following evaluation was performed about the polarizing plate with a phase difference layer obtained by the Example and the comparative example. The results are shown in Table 2.
<Heat resistance>
The polarizing plate with a retardation layer was cut into a size of 120 mm × 60 mm, and the surface on the retardation layer B side was bonded to glass through the adhesive used in Example 1 to prepare a test sample. The test sample was put into an oven at 85 ° C. and stored for 500 hours, and then the presence or absence of cracks in the retardation layer was confirmed with an optical microscope.
The heat resistance was evaluated according to the following criteria.
A: No crack occurred in the retardation layer.
A: Only cracks originating from the bonded foreign material occurred in a part of the retardation layer.
○: Cracks occurred in a part of the retardation layer, but it was a level that could not be visually recognized.
Δ: A crack occurred in a part of the retardation layer, which was a level that can be visually confirmed.
X: Many cracks occurred on the entire surface of the retardation layer.

  As can be seen from Table 2, the retardation layer-attached polarizing plate of the example suppresses cracks in the retardation layer. Moreover, Examples 2-13 which contain an ultraviolet absorber as an adhesive composition are excellent in an ultraviolet absorption characteristic, and especially Examples 5-6 and 8-13 which further contain a pigment | dye compound are especially excellent in an ultraviolet absorption characteristic. Yes.

  The optical layered body of the present invention is suitably used for an image display device such as an organic EL display device.

DESCRIPTION OF SYMBOLS 10 Polarizing plate 20 1st phase difference layer 30 Adhesive layer 40 2nd phase difference layer 50 Adhesive layer 100 Polarizing plate with phase difference layer

Claims (7)

It has a polarizing plate, a first retardation layer, an adhesive layer, and a second retardation layer in this order,
The first retardation layer and the second retardation layer contain a liquid crystal compound,
The polarizing plate with a retardation layer, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer contains 0.05 parts by weight or more of an isocyanate crosslinking agent with respect to 100 parts by weight of the base polymer.   The polarizing plate with a retardation layer according to claim 1, wherein the base polymer is a (meth) acrylic polymer.   The polarizing plate with a retardation layer according to claim 1, wherein the base polymer contains a carboxyl group-containing monomer as a monomer component.   The polarizing plate with a retardation layer according to claim 1, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer further contains an ultraviolet absorber.   The polarizing plate with a retardation layer according to claim 4, wherein the ultraviolet absorber has 0 to 3 hydroxyl groups in the molecular structure.   The polarizing plate with a retardation layer according to claim 1, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer further comprises a dye compound present in a wavelength region having a maximum absorption wavelength of an absorption spectrum of 380 nm to 430 nm. . An organic EL display device comprising the polarizing plate with a retardation layer according to claim 1.

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