JP2006206727A - Method for adjusting peel strength, adhesive layer for optical member and method for producing the same, optical member with adhesive and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily adjusting peel strength of a silicone release liner without using a silicone component such as a heavy release agent, to provide an adhesive layer for optical members which has excellent durability and suitable peel strength and a method for producing the same, and to provide an optical member with an adhesive having the adhesive layer and an image display device using the same. <P>SOLUTION: The method for adjusting peel strength of a silicone release liner comprises the steps of providing an adhesive layer composed of an adhesive composition which contains a (meth)acrylic polymer comprising 80 wt% or more of an alkyl methacrylate as a monomer unit and having a weight average molecular weight of 1,000,000-3,000,000 on a release-treated surface of the silicone release liner and irradiating the adhesive layer with ultraviolet light. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for adjusting the release force of a silicone release liner, an adhesive layer for an optical member in which an adhesive layer is laminated on the release-treated surface of a silicone release liner, a method for producing the same, and an optical member with an adhesive. Further, the present invention relates to an image display device such as a liquid crystal display device, an organic EL display device, and a PDP using the optical member pressure-sensitive adhesive layer. Examples of the optical member include a polarizing plate, a retardation plate, an optical compensation film, a brightness enhancement film, and those in which these are laminated.

  An optical member used for a liquid crystal display device or the like, for example, a polarizing plate or a retardation plate is attached to a liquid crystal cell using an adhesive. Usually, an optical member with an adhesive in which an adhesive layer is laminated on an optical member is used. Since the material used for the optical member has a large expansion and contraction under heating and humidification conditions, it tends to float and peel off after being attached. For this reason, the pressure-sensitive adhesive for optical members is required to have durability that can cope with heating conditions and humidification conditions.

  In addition, these optical members with pressure-sensitive adhesives have a structure that is integrated with a release liner that is usually subjected to a silicone release treatment. As the release liner for the optical member with the pressure-sensitive adhesive, a release liner in which a PET film is precisely coated with silicone is used because it is excellent in transparency, heat resistance and smoothness and has few appearance defects.

  This silicone release liner is removed when it is no longer needed, but if the release force of the silicone release liner is too high when it is removed, it will be difficult to remove when the release liner is removed, while if it is too small, it will be punched. There arises a problem that the release liner floats or peels off in the optical member manufacturing process such as the above, and an appropriate peeling force is required.

  As a method for adjusting the appropriate peeling force, for example, a method of changing the amount of the silicone component used has been proposed (see, for example, Patent Documents 1 and 2).

  In addition, a method for adjusting the peeling force by blending a release agent with a silicone release agent has been proposed (see, for example, Patent Documents 3 and 4).

  Further, a release film having an appropriate peeling force can be obtained by laminating a belt-like print layer in advance before laminating the release layer, and securing a region having a high peel force and a region having a light peel force on the same surface. Has been proposed (see, for example, Patent Documents 5 and 6).

  Moreover, the release film which has moderate peeling force is proposed by making the area | region where peeling force differs exists in the same surface of a peeling film (for example, refer patent document 7 and 8).

  However, if the release force is adjusted by using, for example, a heavy release agent for the silicone component, there is a problem of heavy release with time, or the heavy release agent is transferred to the surface of the adhesive sheet to deteriorate the adhesive properties. there is a possibility. Further, it has been found that when the silicone release liner is wound with a raw fabric, the heavy release agent is transferred to the back surface, causing problems when the release liner is peeled off.

In addition, a method has been proposed in which the adhesive layer contains a compound reactive to ionizing radiation or chemical radiation treatment to determine the release force between the release layer and the adhesive layer (see, for example, Patent Document 9). However, even if such a proposal is used, in an optical member application with large expansion and contraction under heating conditions and humidification conditions, it is likely to float and peel off due to expansion and contraction after application, and can be handled under heating conditions and humidification conditions. Durability and moderate peel force are not aligned side by side.
JP-A-6-298875 JP 2000-199199 A JP-A-6-166740 JP-A-10-195387 Japanese Patent Laid-Open No. 10-230576 JP 2001-219489 A JP 2001-334622 A JP 2002-154181 A JP 2002-530510 A

  Then, the objective of this invention aims at providing the adjustment method of the peeling force of a silicone release liner easily, without using silicone components, such as a heavy release agent. Another object of the present invention is to provide a pressure-sensitive adhesive layer for optical members that is excellent in durability and has an appropriate peeling force, and a method for producing the same. Furthermore, it is providing the optical member with an adhesive which has the said adhesive layer, and an image display apparatus using the same.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above-described object can be achieved by using the following method as a method for adjusting the release force of the silicone release liner, and the present invention has been completed. .

  That is, the method for adjusting the release force of the silicone release liner according to the present invention includes a silicone release liner having a weight-average molecular weight of 1,000,000 to 3,000,000 (methaacrylate) containing 80% by weight or more of an alkyl (meth) acrylate as a monomer unit. ) Including a step of providing a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing an acrylic polymer and a step of irradiating the pressure-sensitive adhesive layer with ultraviolet rays.

  Moreover, the manufacturing method of the adhesive layer with a silicone release liner of this invention is a weight average molecular weight 1 million-3 million which contains 80 weight% or more of (meth) acrylic-acid monomers as a monomer unit in the peeling process surface of a silicone release liner. It is a manufacturing method of an adhesive layer including the process of providing the adhesive layer which consists of an adhesive composition containing the (meth) acrylic-type polymer, Comprising: The process of adjusting the peeling force of a silicone release liner by ultraviolet irradiation is included. .

  According to the method for adjusting the release force of the silicone release liner of the present invention, as shown in the results of the examples, the step of providing an adhesive layer comprising an adhesive composition containing a specific (meth) acrylic polymer, and the adhesive By using the method for adjusting the release force of the silicone release liner including the step of irradiating the agent layer with ultraviolet rays, the release force of the silicone release liner can be easily adjusted. The details of the reason why the release force of the silicone release liner can be easily adjusted by the above adjustment method are not clear, but the radical active species generated by UV irradiation cause a hydrogen abstraction reaction in the silicone molecule, resulting in modification of the silicone surface. Presumed to be.

  In addition, the silicone release liner in this invention means the release liner (a separator is also included) peel-processed with the silicone type release agent.

  In the method for adjusting the peeling force of the silicone release liner, 0.01 to 1 part by weight of a silane coupling agent can be further contained with respect to 100 parts by weight of the pressure-sensitive adhesive composition.

  Moreover, in the said peeling force adjustment method of a silicone release liner, 0.01-3 weight part of isocyanate type crosslinking agents can be further contained with respect to 100 weight part of said adhesive compositions.

  Further, in the method for adjusting the peel strength of the silicone release liner, 0.01 to 3 parts by weight of a photoradical generator can be further contained with respect to 100 parts by weight of the pressure-sensitive adhesive composition. By using this pressure-sensitive adhesive composition, the peeling force of the silicone release liner can be adjusted with a smaller amount of ultraviolet irradiation.

  On the other hand, the method for producing a pressure-sensitive adhesive layer with a silicone release liner according to the present invention includes a step of providing a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing the (meth) acrylic polymer on the release-treated surface of a silicone release liner. It is a manufacturing method of an agent layer, Comprising: The process of adjusting the peeling force of a silicone release liner by ultraviolet irradiation is included. By using this production method, it is possible to obtain a pressure-sensitive adhesive layer for an optical member that is excellent in durability and has an appropriate peeling force.

  In the manufacturing method of the said adhesive layer, 0.01-1 weight part of silane coupling agents can further be contained with respect to 100 weight part of said adhesive compositions. By using this pressure-sensitive adhesive composition, it is possible to more reliably obtain a pressure-sensitive adhesive layer for an optical member having excellent durability and an appropriate peeling force.

  Moreover, in the manufacturing method of the said adhesive layer, 0.01-3 weight part of isocyanate type crosslinking agents can further be contained with respect to 100 weight part of said adhesive compositions. By using this pressure-sensitive adhesive composition, it is possible to more reliably obtain a pressure-sensitive adhesive layer for an optical member having excellent durability and an appropriate peeling force.

  Furthermore, in the manufacturing method of the said adhesive layer, 0.01-3 weight part of photoradical generating agents can further be contained with respect to 100 weight part of said adhesive compositions. By using this pressure-sensitive adhesive composition, it is possible to obtain a pressure-sensitive adhesive layer for an optical member that is excellent in durability and has an appropriate peeling force with a smaller amount of ultraviolet irradiation.

  Moreover, the method for producing the pressure-sensitive adhesive sheet with a silicone release liner of the present invention is the method for producing a pressure-sensitive adhesive layer with a silicone release liner according to any one of the above, wherein the pressure-sensitive adhesive layer is irradiated with ultraviolet rays. It adjusts so that the peeling force may be in the range of 0.1 to 0.4 N / 50 mm. By using this production method, it is possible to obtain pressure-sensitive adhesive sheets with a silicone release liner that have excellent durability and an appropriate peeling force.

  On the other hand, the pressure-sensitive adhesive layer for optical members of the present invention is produced by the above method. Since the pressure-sensitive adhesive layer of the present invention exhibits the above-described effects, by using the pressure-sensitive adhesive layer of the present invention, it is possible to obtain pressure-sensitive adhesive sheets for optical members that have excellent durability and an appropriate peeling force. Therefore, it is particularly useful as a re-peelable pressure-sensitive adhesive layer.

  The pressure-sensitive adhesive sheet for optical members of the present invention is obtained by forming a pressure-sensitive adhesive layer produced by the above method on a release liner. According to the pressure-sensitive adhesive sheet for optical members of the present invention, the pressure-sensitive adhesive sheet for optical members having excellent durability and an appropriate peeling force is provided because the pressure-sensitive adhesive layer having the above-described effects is provided.

  Furthermore, the optical member with pressure-sensitive adhesive of the present invention is characterized in that the above-mentioned pressure-sensitive adhesive layer for optical members is formed on one side or both sides of the optical member. According to the optical member with pressure-sensitive adhesive of the present invention, since the pressure-sensitive adhesive layer having the above-described effects is provided, the optical member with pressure-sensitive adhesive has excellent durability and an appropriate peeling force.

  Further, the image display device of the present invention is a liquid crystal display device, an organic EL display device, a PDP or the like using the optical member with an adhesive, and does not cause peeling or foaming even when stored in a high temperature and high humidity state. Even when the image display device is reused by peeling off the optical member due to durability, the adhesive force does not increase, and it has a function of easily peeling without adversely affecting the device.

  That is, the method for adjusting the release force of the silicone release liner according to the present invention includes a silicone release liner having a weight-average molecular weight of 1,000,000 to 3,000,000 (methaacrylate) containing 80% by weight or more of an alkyl (meth) acrylate as a monomer unit. ) Including a step of providing a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing an acrylic polymer and a step of irradiating the pressure-sensitive adhesive layer with ultraviolet rays.

  In the step of providing the pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition of the present invention, hot-melt coating that does not use a dispersion solvent of the pressure-sensitive adhesive composition may be used, but in order to improve the coating accuracy, the dispersion solvent Is preferably used.

  The dispersion solvent is not particularly limited, and for example, organic solvents such as toluene, ethyl acetate, alcohols, ketones, water, and the like can be appropriately used. Further, coating using the solvent used for polymer polymerization directly is also possible, and a solvent may be added as appropriate. These solvents may be used alone or in combination of two or more.

  As shown in “Adhesive Handbook (2nd edition), P174, edited by Adhesive Tape Industry Association, 1995.10.12”, the silicone release liner has a condensation reaction type silicone release agent (for example, a base polymer at both ends). A polydimethylsiloxane having a hydroxyl group, a polymethylhydrosiloxane siloxane as a crosslinking agent, and a tin-based catalyst as a catalyst are generally used, and an addition reaction type silicone release agent (for example, both ends as a base polymer) A polydimethylsiloxane having a hydroxyl group in which a part of the methyl group is substituted with a vinyl group, a polymethylhydrosiloxane siloxane as a crosslinking agent, and a platinum catalyst as a catalyst are generally used) However, the present invention is not particularly limited, and any release agent is used. It may be a release liner.

  The base material used for the release liner is a polyethylene laminate type in which low-density polyethylene or a blend of low-density polyethylene and high-density polyethylene is laminated to high-quality paper or kraft paper, glassine type using glassine paper as the base paper, super Super-calendered type using calendered paper as base paper, clay-coated type coated with clay and binder on high-quality paper or kraft paper, or water-based resin coated type coated with PVC, starch, carboxymethylcellulose, etc. Examples thereof include those based on a paper base material, and those based on a plastic film such as PET (polyethylene terephthalate), OPP (biaxially oriented polypropylene), PE (polyethylene), and the like.

  As the pressure-sensitive adhesive composition used in the present invention, a (meth) acrylic polymer having a weight average molecular weight of 1,000,000 to 3,000,000 containing 80% by weight or more of an alkyl (meth) acrylate as a monomer unit is used.

  As the alkyl (meth) acrylate used as the monomer component of the base polymer, an ester with an alcohol having 12 or less carbon atoms is used. Particularly preferred are (meth) acrylic monomers having an alkyl group having 4 to 12 carbon atoms.

  Examples of the (meth) acrylic monomer include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and s-butyl (meth). Acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate N-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate and the like. These acrylic monomers may be used alone or in combination of two or more.

  In the present invention, the (meth) acrylic polymer refers to a (meth) acrylic polymer and / or a methacrylic polymer, the (meth) acrylate refers to an acrylate and / or methacrylate, and an alkyl (meth) acrylate. Refers to alkyl acrylate and / or alkyl methacrylate.

  The ratio of the alkyl (meth) acrylate in the (meth) acrylic polymer is preferably 80% by weight or more (for example, about 80 to 99.8% by weight) as a monomer unit, and 90% by weight or more (for example, 90%). More preferably, it is about ˜99.5% by weight. If it is less than 80% by weight, the stress relaxation property becomes poor, which is not preferable.

  In the present invention, a functional group-containing monomer containing a functional group such as a hydroxyl group can be used. The kind of the functional group can be appropriately selected.

  Specific examples of the functional group-containing monomer include (meth) acrylic acid, itaconic acid, maleic acid, crotonic acid, maleic anhydride, 2- (meth) acryloyloxyethyl succinic acid, and 2- (meth) acrylic acid. Carboxyl group-containing monomers such as leuoxyethylphthalic acid or anhydrides thereof, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N- Amide group-containing monomers such as butoxymethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3 -Hydroxybutyl (meta Hydroxyl group-containing monomers such as acrylate, 4-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, amino group-containing monomers such as dimethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate, Examples include glycidyl group-containing monomers such as glycidyl (meth) acrylate, (meth) acrylonitrile, N- (meth) acryloylmorpholine, N-vinyl-2-pyrrolidone and the like.

  The functional group-containing monomer may be used alone or in combination, but the total content is preferably 0.01 to 20% by weight as a monomer unit of the (meth) acrylic polymer, It is more preferably 0.05 to 10% by weight, and more preferably 0.5 to 7% by weight. When the content of the functional group-containing monomer is less than 0.01% by weight, the cross-linking is insufficient and the durability may be inferior. On the other hand, when the content of the functional group-containing monomer exceeds 20% by weight, the adhesive force to the liquid crystal cell tends to be too large, which is not preferable.

  The (meth) acrylic polymer used in the present invention has a weight average molecular weight of 1,000,000 to 3,000,000, preferably 1,500,000 to 2,700,000, and more preferably 2,000,000 to 2,500,000. When the weight average molecular weight is less than 1,000,000, the durability is inferior and foaming may occur in the heating test. On the other hand, when the weight average molecular weight exceeds 3 million, the fluidity of the polymer is lowered, the wetting to the polarizing plate becomes insufficient, the adhesiveness is inferior, and the pressure-sensitive adhesive composition layer such as a release liner and an optical member. Air may remain between them. In addition, the weight average molecular weight in this invention says the value calculated in polystyrene conversion by GPC (gel permeation chromatography) method.

  The glass transition temperature (Tg) of the (meth) acrylic polymer is 0 ° C. or lower (usually −100 ° C. or higher), preferably −10 ° C. or lower. When the glass transition temperature is higher than 0 ° C., the polymer is difficult to flow and the wetting to the polarizing plate is insufficient, which may cause air to remain between the polarizing plate and the pressure-sensitive adhesive layer. In addition, Tg of a (meth) acrylic-type polymer can be adjusted in the said range by changing suitably the monomer component and composition ratio to be used. The glass transition temperature (Tg) in this invention says what was obtained by measuring with the measuring method using a dynamic viscoelasticity apparatus.

  The polymerization method of the (meth) acrylic polymer used in the present invention is not particularly limited, and can be appropriately polymerized by a known method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization or the like. Further, the polymer obtained may be any of a random polymer, a block polymer, a graft polymer, and the like.

  For example, when using solution polymerization, 0.01 to 0.2 parts by weight of a polymerization initiator such as azobisisobutyronitrile is blended with 100 parts by weight of a monomer, and a polymerization solvent such as ethyl acetate is used. And a predetermined (meth) acrylic-type polymer can be obtained by making it react at 50-70 degreeC for 8 to 30 hours under nitrogen stream.

  Moreover, a polymerization initiator, a chain transfer agent, an emulsifier, etc. can also be used suitably in the case of superposition | polymerization of a (meth) acrylic-type polymer.

  Examples of the polymerization initiator used in the present invention include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- ( 5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2′-azobis (2-methylpropionamidine) disulfate, 2,2′-azobis (N, N′-dimethyleneisobutylamidine ), 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate (manufactured by Wako Pure Chemical Industries, Ltd., VA-057), azo initiators, potassium persulfate, ammonium persulfate Persulfate such as di (2-ethylhexyl) peroxydicarbonate, di (4-t-butylcyclohexyl) peroxydicarbonate, di- sec-butyl peroxydicarbonate, t-butylperoxyneodecanoate, t-hexylperoxypivalate, t-butylperoxypivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1, 1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, di (4-methylbenzoyl) peroxide, dibenzoyl peroxide, t-butylperoxyisobutyrate, 1,1-di (t- Hexylperoxy) peroxide initiators such as cyclohexane, t-butyl hydroperoxide, hydrogen peroxide, peroxides such as a combination of persulfate and sodium bisulfite, a combination of peroxide and sodium ascorbate, Redox initiators combined with reducing agents can be listed , But it is not limited thereto.

  The polymerization initiator may be used alone or in combination of two or more, but the total content is 0.005 to 1 part by weight with respect to 100 parts by weight of the monomer. Is preferably about 0.02 to 0.5 parts by weight.

  In the present invention, a chain transfer agent may be used in the polymerization. By using a chain transfer agent, the molecular weight of the (meth) acrylic polymer can be appropriately adjusted.

  Examples of the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2,3-dimercapto-1-propanol.

  These chain transfer agents may be used alone or in admixture of two or more, but the total content is 0.01-0. About 5 parts by weight.

  Examples of the emulsifier used in the present invention include anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, ammonium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and polyoxyethylene. Nonionic emulsifiers such as alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene-polyoxypropylene block polymers, and the like can be mentioned. These emulsifiers may be used alone or in combination of two or more.

  Furthermore, as reactive emulsifiers, as emulsifiers into which radical polymerizable functional groups such as propenyl groups and allyl ether groups are introduced, specifically, for example, Aqualon HS-10, HS-20, KH-10, BC-05 BC-10, BC-20 (Daiichi Kogyo Seiyaku Co., Ltd.), Adekaria Soap SE10N (Asahi Denka Kogyo Co., Ltd.) and the like. Reactive emulsifiers are preferable because they are incorporated into the polymer chain after polymerization and thus have improved water resistance. The amount of the emulsifier used is more preferably 0.3 to 5 parts by weight and 0.5 to 1 part by weight with respect to 100 parts by weight of the monomer in view of polymerization stability and mechanical stability.

  In the case of using emulsion polymerization, for example, the above-mentioned monomers and copolymerization monomers are first mixed, and after emulsifying and water are added thereto, they are emulsified to prepare an emulsion. The monomer at this time may be blended in whole or in part with the total amount used, and the remainder may be dropped during the polymerization. Next, a polymerization initiator and, if necessary, water are added to this emulsion to carry out emulsion polymerization (emulsion polymerization).

  In addition, water may be blended only at the time of preparing the emulsion, or may be further blended thereafter, and can be appropriately selected according to the polymerization method described later. The amount of water is not particularly limited, but the solid content concentration of the (meth) acrylic polymer after emulsion polymerization (emulsion polymerization) is 30 to 75% by weight, preferably 35 to 70% by weight. Prepare to be.

  The method of emulsion polymerization (emulsion polymerization) is not particularly limited, and can be appropriately selected from a batch polymerization method, a total amount dropping method, a two-stage polymerization method combining these, and the like.

  In the batch polymerization method, for example, a monomer mixture, an emulsifier, and water are charged into a reaction vessel and emulsified by stirring and mixing to prepare an emulsion, and then a polymerization initiator and water as necessary are added to the reaction vessel to perform emulsion polymerization ( Emulsion polymerization).

  In addition, in the total amount dropping method, first, a monomer mixture, an emulsifier and water are added and emulsified by stirring and mixing to prepare a dropping solution, and a polymerization initiator and water are charged into a reaction vessel, and then the dropping solution is added to the reaction vessel. It is dripped in and emulsion polymerization (emulsion polymerization) is carried out.

  As additives after emulsion polymerization, for example, known ones such as pH buffering agents, neutralizing agents, antifoaming agents and stabilizers can be appropriately used.

  The pressure-sensitive adhesive composition of the present invention has the above (meth) acrylic polymer as a base polymer.

  In the step of irradiating with ultraviolet rays in the present invention, for example, a low pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a chemical lamp, a black light lamp, a mercury-xenon lamp, an excimer lamp, a short arc lamp, helium / cadmium. Lasers, argon lasers, excimer lasers, sunlight, and the like can be used as light sources for light irradiation, and among them, it is preferable to use a low-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a metal halide lamp, or the like.

  In addition, the wavelength of ultraviolet rays when irradiating with ultraviolet rays can be appropriately selected according to the required peeling force of the release liner, but is preferably 1 to 400 nm, more preferably 50 to 380 nm. 100 to 380 nm is more preferable.

The irradiation amount of ultraviolet rays when irradiating with ultraviolet rays can be appropriately selected according to the required peeling force of the release liner, but is usually preferably in the range of 0.2 to 10 J / cm ² , More preferably, it is in the range of 0.2 to 10 J / cm ² , and more preferably in the range of 0.2 to 10 J / cm ² .

  The temperature at the time of ultraviolet irradiation is not particularly limited, but is preferably 140 ° C. or lower in consideration of the heat resistance of the support.

  In the present invention, as a method of irradiating ultraviolet rays with a pressure-sensitive adhesive layer provided on a silicone release liner, a method of irradiating ultraviolet rays from the pressure-sensitive adhesive layer side, a base material of the release liner is polyethylene terephthalate (PET) or biaxial In the case where ultraviolet rays are allowed to pass, such as stretched polypropylene (OPP), a method of irradiating ultraviolet rays from the release liner side can be used.

  In addition, as a method of irradiating ultraviolet rays with a support provided on a silicone release liner through an adhesive layer, the release liner base material is polyethylene terephthalate (PET), biaxially oriented polypropylene (OPP), or the like. When UV rays are allowed to pass through, the method of irradiating UV rays from the release liner side, the support is a polyester film such as polyethylene terephthalate (PET), polyethylene film, polypropylene film, polyvinyl chloride film, polycarbonate film In the case where ultraviolet rays are allowed to pass, such as polyurethane film and cellophane film, a method of irradiating ultraviolet rays from the release liner side can be used.

  In the present invention, it is preferable that the peeling force of the silicone release liner is adjusted to be in the range of 0.1 to 0.4 N / 50 mm by the step of irradiating the pressure-sensitive adhesive layer with ultraviolet rays. It is more preferable to adjust so that it may become the range of .25N / 50mm, and it is still more preferable to adjust so that it may become the range of 0.12-0.2N / 50mm. If the peel force is less than 0.1 N / 50 mm, the pressure-sensitive adhesive layer may float from the release liner during production line processes or storage / storage, while the peel force is less than 0.4 N / 50 mm. When it becomes larger, there is a tendency that peeling becomes difficult.

  In the present invention, a photoradical generator can further be used, and any conventionally known photoradical generator can be used without particular limitation. By using such a photoradical generator, the release force of the release liner can be adjusted with a smaller amount of UV irradiation.

  Examples of the photo radical generator include polyfunctional photocrosslinkers having a plurality of radical generation points in the molecule, such as hydroxy ketones, benzyl dimethyl ketals, amino ketones, acylphosphine oxides, and benzophenones. And triazine derivatives containing trichloromethyl group.

  More specifically, for example, 2- (p-methoxyphenyl) -4,6-bis- (trichloromethyl) -s-triazine, 2-phenyl-4,6-bis- (trichloromethyl) -s-triazine 2- (4′-methoxy-1′-naphthyl) -4,6-bis- (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (4′-methoxyphenyl) -6-triazine, 2 , 4-trichloromethyl- (4′-methoxynaphthyl) -6-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, 2,4-trichloromethyl- (4′-methoxystyryl) -6 And triazine, 2-hydroxy-2-methyl [4- (1-methylvinyl) phenyl] propanol oligomer, and the like.

  These photo radical generators may be used alone or in combination of two or more. A monofunctional photoradical generator and a polyfunctional photoradical generator may be used in combination as appropriate.

  In the present invention, the photo radical generator is mainly composed of a (meth) acrylic polymer when a (meth) acrylic polymer is used alone, and a (meth) acrylic polymer when a reactive diluent is used. And a reactive diluent as a main material, with respect to 100 parts by weight of the main material, 0.01 to 3 parts by weight, preferably 0.05 to 2 parts by weight, more preferably 0.1 to 1.5 parts by weight. Partly formulated. When the blending amount is less than 0.01 parts by weight, even if the photoradical generator is sufficiently decomposed by ultraviolet irradiation, the release force of the release liner is small, and the durability may be lowered. On the other hand, if it exceeds 3 parts by weight, the releasability may become too high, and the (meth) acrylic polymer is cross-linked by the generated radicals, so the pressure-sensitive adhesive layer becomes harder and the polarizing plate There is a tendency that the followability with respect to the dimensional change is deteriorated and the durability is lowered, and further, the photo radical generator remains and the physical properties are changed with time.

  In the present invention, a silane coupling agent can be used, and any conventionally known silane coupling agent can be used without any particular limitation. For example, epoxy groups such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2- (3,4 epoxycyclohexyl) ethyltrimethoxysilane -Containing silane coupling agent, 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N- (1,3-dimethylbutylidene) propylamine Amino group-containing silane coupling agents such as 3-acryloxypropyltrimethoxysilane, (meth) acrylic group-containing silane coupling agents such as 3-methacryloxypropyltriethoxysilane, and isocyanates such as 3-isocyanatopropyltriethoxysilane Such as group-containing silane coupling agent.

  In this invention, the said silane coupling agent is 0.01-1 weight part with respect to 100 weight part of solid content of a (meth) acrylic-type polymer, Preferably 0.02-0.6 weight part is mix | blended. When the blending amount increases, the adhesive strength to the liquid crystal cell or the like may increase and the removability may decrease, whereas when it is too small, the durability may decrease.

  The pressure-sensitive adhesive composition of the present invention is more excellent in heat resistance and durability by appropriately crosslinking a (meth) acrylic polymer. As the crosslinking agent used in the present invention, an isocyanate compound, an epoxy compound, a melamine resin, an aziridine derivative, a metal chelate compound, and the like are used. Among these, an isocyanate compound is particularly preferably used mainly from the viewpoint of obtaining an appropriate cohesive force.

  In addition, an isocyanate type crosslinking agent means the isocyanate compound which has 2 or more isocyanate groups (Isocyanate reproduction | regeneration type functional groups which protected the isocyanate group temporarily by the block agent and quantification etc.) in 1 molecule.

  Examples of the isocyanate compound include aromatic isocyanates such as tolylene diisocyanate, xylene diisocyanate and diphenylmethane diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, aliphatic isocyanates such as hexamethylene diisocyanate, and diisocyanate adducts to various polyols. can give.

  More specifically, examples of the isocyanate compound include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate, alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, and isophorone diisocyanate, Aromatic diisocyanates such as 4-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane / tolylene diisocyanate trimer adduct (trade name Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.), tri Methylolpropane / hexamethylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name Coronate HL), hexamethylene diisocyanate Over the door of the isocyanurate body (Nippon Polyurethane Industry Co., Ltd., trade name: Coronate HX), and the like, such as isocyanate adducts such as. Furthermore, adducts of various polyols of these isocyanate compounds can be mentioned. In addition, trimethylolpropane adduct of tolylene diisocyanate (Mitsui Takeda Chemicals, Takenate D-101N), xylylene diisocyanate trimethylolpropane adduct (Mitsui Takeda Chemicals, Takenate D-110N), isophorone diisocyanate tri Methylolpropane adduct (Mitsui Takeda Chemicals, Takenate D-140N), hexamethylene diisocyanate trimethylolpropane adduct (Mitsui Takeda Chemicals, Takenate D-160N), hexamethylene diisocyanate trimer (isocyanurate) ) (Manufactured by Mitsui Takeda Chemicals, Takenate D-170N), trade name Sumijoule L-75 (manufactured by Sumitomo Biurethane Co., Ltd.), trade name Sumijoule FL-2 (manufactured by Sumitomo Biurethane Co., Ltd.), and the like. These isocyanate compounds may be used alone or in combination of two or more.

  The isocyanate compound is more preferably used for a (meth) acrylic polymer in which a hydroxyl group is introduced into a polymer structure by copolymerizing a hydroxyl group-containing monomer such as 2-hydroxyethyl acrylate during the production of the polymer.

  The content of the isocyanate-based crosslinking agent used in the present invention is usually 0.01 to 3 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer, but preferably 0.03 to 2 parts by weight. 0.05 to 1 part by weight is more preferable. When the content is less than 0.01 parts by weight, problems such as foaming may occur in the heating test. On the other hand, if the content is more than 3 parts by weight, the adhesiveness may be inferior, such as peeling off in a heating test or a humidification test.

  Examples of the epoxy compound include N, N, N ′, N′-tetraglycidyl-m-xylenediamine (trade name: TETRAD-X, manufactured by Mitsubishi Gas Chemical Company) and 1,3-bis (N, N-diglycidyl). Aminomethyl) cyclohexane (trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Company, Inc.). These compounds may be used alone or in combination.

  Examples of the melamine resin include hexamethylol melamine. Examples of the aziridine derivative include a commercial product name HDU (manufactured by Mutual Pharmaceutical Company), a product name TAZM (manufactured by Mutual Pharmaceutical Company), and a product name TAZO (manufactured by Mutual Pharmaceutical Company). These compounds may be used alone or in combination.

  Examples of the metal chelate compound include aluminum, iron, tin, titanium, and nickel as metal components, and acetylene, methyl acetoacetate, and ethyl lactate as chelate components. These compounds may be used alone or in combination.

  Content of the said crosslinking agent other than an isocyanate type crosslinking agent is about 0.01-5 weight part normally with respect to 100 weight part of (meth) acrylic-type polymers.

  In the pressure-sensitive adhesive composition of the present invention, as optional components, in addition to the above components, various tackifiers such as phenol resin, terpene-phenol resin, terpene resin, xylene resin, rosin, hydrogenated rosin, calcium carbonate, carbon black, etc. Inorganic fillers, lubricants, anti-aging agents, colorants, pigments, powders, surfactants, plasticizers, antifoaming agents, light stabilizers, thixotropic agents, UV absorbers, low molecular weight polymers, surface lubricants , Stabilizers such as leveling agents, antioxidants, polymerization inhibitors, heat stabilizers, hydrolysis stabilizers, metal powders, particles, foils, and the like can be used as appropriate. These arbitrary components may be used individually by 1 type, or may use 2 or more types.

  The thickness of the pressure-sensitive adhesive layer used in the present invention is preferably 2 μm to 500 μm after drying, and more preferably 5 μm to 100 μm. When the thickness is smaller than 2 μm, the adhesive strength to the optical member becomes insufficient, and when the thickness exceeds 500 μm, the adhesive strength is saturated, which is not economical, and the adhesive sticks out or causes cohesive failure and is difficult to peel.

  The pressure-sensitive adhesive layer of the present invention is formed on a silicone release liner obtained by peeling off a pressure-sensitive adhesive layer made of such a pressure-sensitive adhesive composition. At that time, the formation of the pressure-sensitive adhesive layer is generally carried out by volatilizing the solvent after the application of the pressure-sensitive adhesive composition solution, but the solvent is volatilized from the pressure-sensitive adhesive composition solution applied on an arbitrary support. It is also possible to form the pressure-sensitive adhesive layer obtained by transferring to a silicone release liner. In addition, the adhesive composition is applied and adhered by roll coater such as reverse coater and gravure coater, curtain coater, lip coater, die coater, roll brush, spray coat, air knife coat method, extrusion coat method with die coater, etc. An agent layer may be formed. Further, for example, curing may be performed for the purpose of adjusting the component transfer of the pressure-sensitive adhesive layer or adjusting the crosslinking reaction after application.

  In addition, when the pressure-sensitive adhesive composition is applied onto a release-treated silicone release liner, one or more solvents other than the polymerization solvent are newly added to the composition so that the adhesive composition can be uniformly applied onto the silicone release liner. Also good. Examples of the release liner subjected to the release treatment include a silicone release liner obtained by subjecting a PET film to a silicone release treatment.

  The pressure-sensitive adhesive layer with a silicone release liner of the present invention is formed on one side or both sides of various supports made of a plastic film such as a polyester film, a porous material such as paper or nonwoven fabric, and is formed into a sheet shape or a tape shape. It can also be used as an adhesive sheet.

  The support constituting the pressure-sensitive adhesive sheet is preferably a resin film having heat resistance and solvent resistance and flexibility. Due to the flexibility of the support, roll coaters such as reverse coaters and gravure coaters, curtain coaters, lip coaters, die coaters, roll brushes, spray coats, air knife coat methods, extrusion coat methods such as die coaters, etc. The pressure-sensitive adhesive composition can be applied and wound into a roll.

  The resin for forming the support film as the support is not particularly limited as long as it can be formed into a sheet or film. For example, polyethylene, polypropylene, poly-1-butene, poly-4-methyl -1-pentene, ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, polyolefin film such as ethylene / vinyl alcohol copolymer, polyethylene Polyester film such as terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyacrylate film, polystyrene film, nylon 6, nylon 6,6, polyamide film such as partially aromatic polyamide, polyvinyl chloride film, polyvinyl chloride Den film, polycarbonate film, fluorine-containing resins such as polyfluoroethylene, polyimide, nylon, cellulose and the like.

  In addition, in order to improve the adhesiveness between an adhesive layer and a support film, you may perform corona treatment etc. on the surface of a support film. Moreover, you may perform a back surface process to a support film.

  The thickness of the film is usually about 5 to 200 μm, preferably about 10 to 100 μm.

The optical member with pressure-sensitive adhesive of the present invention is obtained by forming a pressure-sensitive adhesive layer on one side or both sides of an optical member such as a polarizing plate from the pressure-sensitive adhesive layer formed by the production method.
When the pressure-sensitive adhesive layer is exposed on the surface, it is appropriately protected with a silicone release liner or the like until practical use.

  As the optical member, those used for forming an image display device such as a liquid crystal display device are used, and the type thereof is not particularly limited. For example, the optical member includes a polarizing plate. A polarizing plate having a transparent protective film on one or both sides of a polarizer is generally used.

  The polarizer is not particularly limited, and various types can be used. Examples of polarizers include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films, and two colors such as iodine and dichroic dyes. Examples include polyene-based oriented films such as those obtained by adsorbing volatile 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. The thickness of these polarizers is not particularly limited, but is generally about 5 to 80 μm.

  A polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be produced, for example, by dyeing polyvinyl alcohol in an aqueous solution of iodine and stretching it 3 to 7 times the original length. If necessary, it can be immersed in an aqueous solution such as potassium iodide which may contain boric acid, zinc sulfate, zinc chloride and the like. 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 in an aqueous solution of boric acid or potassium iodide or in a water bath.

  As a material for forming the transparent protective film provided on one side or both sides of the polarizer, a material excellent in transparency, mechanical strength, thermal stability, moisture shielding property, isotropy and the like is preferable. For example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, (meth) acrylic polymers such as polymethyl methacrylate, polystyrene, acrylonitrile / styrene copolymer (AS resin) And styrene-based polymers such as, and polycarbonate-based polymers. In addition, polyethylene, polypropylene, polyolefins having a cyclo or norbornene structure, polyolefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, sulfone polymers , Polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or the above Polymer blends and the like are also examples of polymers that form the transparent protective film. The transparent protective film can also be formed as a cured layer of thermosetting or ultraviolet curable resin such as acrylic, urethane, acrylurethane, epoxy, and silicone.

  Moreover, the polymer film described in JP-A-2001-343529 (WO01 / 37007), for example, (A) a thermoplastic resin having a substituted and / or unsubstituted imide group in the side chain, and (B) a substitution in the side chain And / or a resin composition containing an unsubstituted phenyl and a thermoplastic resin having a nitrile group. A specific example is a film of a resin composition containing an alternating copolymer composed of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer. As the film, a film made of a mixed extruded product of the resin composition or the like can be used.

  Although the thickness of a protective film can be determined suitably, generally it is about 1-500 micrometers from points, such as workability | operativity, such as intensity | strength and handleability, and thin layer property. 1-300 micrometers is especially preferable, and 5-200 micrometers is more preferable.

  Moreover, it is preferable that a protective film has as little color as possible. Therefore, Rth = [(nx + ny) / 2−nz] · d (where nx and ny are the main refractive index in the plane of the film, nz is the refractive index in the film thickness direction, and d is the film thickness). A protective film having a retardation value in the film thickness direction of −90 nm to +75 nm is preferably used. By using a film having a thickness direction retardation value (Rth) of −90 nm to +75 nm, the coloring (optical coloring) of the polarizing plate caused by the protective film can be almost eliminated. The thickness direction retardation value (Rth) is more preferably −80 nm to +60 nm, and particularly preferably −70 nm to +45 nm.

  As the protective film, a cellulose polymer such as triacetyl cellulose is preferable from the viewpoints of polarization characteristics and durability. A triacetyl cellulose film is particularly preferable. In addition, when providing a protective film in the both sides of a polarizer, the protective film which consists of the same polymer material may be used by the front and back, and the protective film which consists of a different polymer material etc. may be used. The polarizer and the protective film are usually in close contact with each other through an aqueous adhesive or the like. Examples of the water-based adhesive include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl-based latex, a water-based polyurethane, and a water-based polyester.

  The surface of the transparent protective film to which the polarizer is not adhered may be subjected to a hard coat layer, an antireflection treatment, an antisticking treatment, or a treatment for diffusion or antiglare.

  Hard coat treatment is performed for the purpose of preventing scratches on the polarizing plate surface, and for example, transparently protects the cured film with excellent hardness and sliding properties with an appropriate UV curable resin such as acrylic and silicone. It can be formed by a method of adding to the surface of the film. The antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the conventional art. Further, the anti-sticking treatment is performed for the purpose of preventing adhesion with an adjacent layer.

  Anti-glare treatment is applied for the purpose of preventing external light from reflecting on the surface of the polarizing plate and obstructing the visibility of the light transmitted through the polarizing plate. For example, roughening by sandblasting or embossing It can be formed by imparting a fine concavo-convex structure to the surface of the transparent protective film by an appropriate method such as a method or a method of blending transparent fine particles. The fine particles to be included in the formation of the surface fine concavo-convex structure are, for example, conductive composed of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide or the like having an average particle size of 0.5 to 50 μm. Transparent fine particles such as inorganic fine particles and organic fine particles made of a crosslinked or uncrosslinked polymer may be used. When forming a surface fine uneven structure, the amount of fine particles used is generally about 2 to 50 parts by weight, preferably 5 to 25 parts by weight, based on 100 parts by weight of the transparent resin forming the surface fine uneven structure. The antiglare layer may also serve as a diffusion layer (viewing angle expanding function or the like) for diffusing the light transmitted through the polarizing plate to expand the viewing angle.

  The antireflection layer, antisticking layer, diffusion layer, antiglare layer, and the like can be provided on the transparent protective film itself, or can be provided separately from the transparent protective film as an optical layer.

  The optical member of the present invention includes, for example, a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), a viewing angle compensation film, and a brightness enhancement film. What becomes an optical layer which may be used for formation of this is mention | raise | lifted. These can be used alone as the optical member of the present invention, and can be laminated on the polarizing plate for practical use and used in one or more layers.

  In particular, a reflective polarizing plate or a semi-transmissive polarizing plate in which a polarizing plate is further laminated with a reflecting plate or a semi-transmissive reflecting plate, an elliptical polarizing plate or a circular polarizing plate in which a retardation plate is further laminated on a polarizing plate, a polarizing plate A wide viewing angle polarizing plate in which a viewing angle compensation film is further laminated on a plate, or a polarizing plate in which a brightness enhancement film is further laminated on a polarizing plate is preferable.

  A reflective polarizing plate is a polarizing plate provided with a reflective layer, and is used to form a liquid crystal display device or the like that reflects incident light from the viewing side (display side). Thus, there is an advantage that it is easy to reduce the thickness of the liquid crystal display device. The reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is attached to one surface of the polarizing plate via a transparent protective layer, if necessary.

  Specific examples of the reflective polarizing plate include those in which a reflective layer is formed by attaching a foil or a vapor deposition film made of a reflective metal such as aluminum on one side of a transparent protective film matted as necessary. Moreover, the transparent protective film contains fine particles so as to have a surface fine concavo-convex structure and a reflective layer having a fine concavo-convex structure thereon. The reflective layer having the fine concavo-convex structure has an advantage that incident light is diffused by irregular reflection to prevent directivity and glaring appearance and to suppress unevenness in brightness and darkness. The transparent protective film containing fine particles also has an advantage that incident light and its reflected light are diffused when passing through it, and light and dark unevenness can be further suppressed. The reflective layer of the fine concavo-convex structure reflecting the surface fine concavo-convex structure of the transparent protective film can be formed by, for example, depositing metal by an appropriate method such as a vapor deposition method such as a vacuum vapor deposition method, an ion plating method, a sputtering method, or a plating method. It can be performed by a method of directly attaching to the surface of the transparent protective layer.

  The reflection plate can be used as a reflection sheet in which a reflection layer is provided on an appropriate film according to the transparent film, instead of directly applying to the transparent protective film of the polarizing plate. Since the reflective layer is usually made of metal, the usage form in which the reflective surface is covered with a transparent protective film, a polarizing plate, etc. prevents the decrease in reflectance due to oxidation, and thus the long-term sustainability of the initial reflectance. In addition, it is more preferable to avoid a separate attachment of the protective layer.

  The transflective polarizing plate can be obtained by using a transflective reflective layer such as a half mirror that reflects and transmits light with the reflective layer. A transflective polarizing plate is usually provided on the back side of a liquid crystal cell, and displays an image by reflecting incident light from the viewing side (display side) when a liquid crystal display device is used in a relatively bright atmosphere. In a relatively dark atmosphere, a liquid crystal display device or the like that displays an image using a built-in light source such as a backlight built in the back side of the transflective polarizing plate can be formed. In other words, the transflective polarizing plate can save the energy of using a light source such as a backlight in a bright atmosphere, and is useful for forming a liquid crystal display device that can be used with a built-in light source in a relatively dark atmosphere. It is.

  An elliptically polarizing plate or a circularly polarizing plate in which a retardation plate is further laminated on a polarizing plate will be described. A phase difference plate or the like is used when changing linearly polarized light to elliptically polarized light or circularly polarized light, changing elliptically polarized light or circularly polarized light to linearly polarized light, or changing the polarization direction of linearly polarized light. In particular, a so-called quarter-wave plate (also referred to as a λ / 4 plate) is used as a retardation plate that changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light. A half-wave plate (also referred to as a λ / 2 plate) is usually used when changing the polarization direction of linearly polarized light.

  The elliptically polarizing plate is effectively used for black and white display without the above color by compensating (preventing) the coloration (blue or yellow) generated by the birefringence of the liquid crystal layer of the super twist nematic (STN) type liquid crystal display device. It is done. Further, the one in which the three-dimensional refractive index is controlled is preferable because it can compensate (prevent) coloring that occurs when the screen of the liquid crystal display device is viewed from an oblique direction. The circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflective liquid crystal display device in which the image is displayed in color, and also has an antireflection function.

  Examples of the retardation plate include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, a liquid crystal polymer alignment film, and a liquid crystal polymer alignment layer supported by a film. The thickness of the retardation plate is not particularly limited, but is generally about 20 to 150 μm.

  Examples of the polymer material include polyvinyl alcohol, polyvinyl butyral, polymethyl vinyl ether, polyhydroxyethyl acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, polycarbonate, polyarylate, polysulfone, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, Polyphenylene sulfide, polyphenylene oxide, polyallylsulfone, polyvinyl alcohol, polyamide, polyimide, polyolefin, polyvinyl chloride, cellulose polymer, norbornene resin, or binary, ternary various copolymers, graft copolymers Examples thereof include polymers and blends. These polymer materials become oriented products (stretched films) by stretching or the like.

  Examples of the liquid crystalline polymer include various main chain types and side chain types in which a conjugated linear atomic group (mesogen) imparting liquid crystal alignment is introduced into the main chain or side chain of the polymer. It is done. Specific examples of main-chain liquid crystalline polymers include nematic alignment polyester liquid crystalline polymers, discotic polymers, cholesteric polymers, etc., which have a structure in which mesogenic groups are bonded at a spacer portion that imparts flexibility. It is done. Specific examples of the side chain type liquid crystalline polymer include polysiloxane, polyacrylate, polymethacrylate, or polymalonate as a main chain skeleton, and a nematic alignment imparting paraffin through a spacer portion composed of a conjugated atomic group as a side chain. Examples thereof include those having a mesogen moiety composed of a substituted cyclic compound unit. These liquid crystalline polymers can be obtained by, for example, applying a solution of a liquid crystalline polymer on an alignment surface such as one obtained by rubbing the surface of a thin film such as polyimide or polyvinyl alcohol formed on a glass plate or one obtained by obliquely depositing silicon oxide. This is done by developing and heat treatment.

  The retardation plate may have an appropriate retardation depending on the purpose of use, such as for the purpose of compensating for various wavelength plates or birefringence of the liquid crystal layer or compensation of viewing angle, etc. In this case, the retardation plate may be laminated to control optical characteristics such as retardation.

  The elliptical polarizing plate and the reflective elliptical polarizing plate are obtained by laminating a polarizing plate or a reflective polarizing plate and a retardation plate in an appropriate combination. Such an elliptically polarizing plate or the like can also be formed by sequentially laminating them sequentially in the manufacturing process of the liquid crystal display device so as to be a combination of a (reflective) polarizing plate and a retardation plate. What was used as optical members, such as a polarizing plate, has the advantage that it is excellent in quality stability, lamination workability, etc., and can improve manufacturing efficiency, such as a liquid crystal display device.

  The viewing angle compensation film is a film for widening the viewing angle so that an image can be seen relatively clearly even when the screen of the liquid crystal display device is viewed from a slightly oblique direction rather than perpendicular to the screen. Examples of such a viewing angle compensation phase difference plate include a phase difference plate, an alignment film such as a liquid crystal polymer, and a film in which an alignment layer such as a liquid crystal polymer is supported on a transparent substrate. A normal retardation plate uses a birefringent polymer film uniaxially stretched in the plane direction, whereas a retardation plate used as a viewing angle compensation film stretches biaxially in the plane direction. Birefringent polymer film, biaxially stretched film such as polymer with birefringence with a controlled refractive index in the thickness direction that is uniaxially stretched in the plane direction and stretched in the thickness direction, etc. Used. Examples of the tilted alignment film include a film obtained by bonding a heat shrink film to a polymer film and stretching or / and shrinking the polymer film under the action of the contraction force by heating, or a film obtained by obliquely aligning a liquid crystal polymer. Is mentioned. The raw material polymer for the phase difference plate is the same as the polymer described in the previous phase difference plate, preventing coloration due to a change in the viewing angle based on the phase difference by the liquid crystal cell and expanding the viewing angle for good visual recognition. An appropriate one for the purpose can be used.

  Also, from the viewpoint of achieving a wide viewing angle with good visibility, an optically compensated phase difference in which a liquid crystal polymer alignment layer, in particular an optically anisotropic layer composed of a discotic liquid crystal polymer gradient alignment layer, is supported by a triacetylcellulose film. A plate can be preferably used.

  A polarizing plate obtained by bonding a polarizing plate and a brightness enhancement film is usually provided on the back side of a liquid crystal cell. The brightness enhancement film reflects a linearly polarized light with a predetermined polarization axis or a circularly polarized light in a predetermined direction when natural light is incident due to a backlight such as a liquid crystal display device or reflection from the back side, and transmits other light. In addition, a polarizing plate in which a brightness enhancement film is laminated with a polarizing plate allows light from a light source such as a backlight to be incident to obtain transmitted light in a predetermined polarization state, and light other than the predetermined polarization state is reflected without being transmitted. The The light reflected on the surface of the brightness enhancement film is further inverted through a reflective layer provided on the rear side thereof, and re-incident on the brightness enhancement film, and part or all of the light is transmitted as light in a predetermined polarization state. Luminance can be improved by increasing the amount of light transmitted through the enhancement film and increasing the amount of light that can be used for liquid crystal display image display by supplying polarized light that is difficult to absorb into the polarizer. That is, when light is incident through the polarizer from the back side of the liquid crystal cell without using a brightness enhancement film, light having a polarization direction that does not coincide with the polarization axis of the polarizer is almost polarized. It is absorbed by the polarizer and does not pass through the polarizer. That is, although it depends on the characteristics of the polarizer used, approximately 50% of the light is absorbed by the polarizer, and the amount of light that can be used for liquid crystal image display is reduced accordingly, resulting in a dark image. In the brightness enhancement film, light having a polarization direction that is absorbed by the polarizer is reflected once by the brightness enhancement film without being incident on the polarizer, and further inverted through a reflection layer provided on the rear side thereof. Repeatedly re-enter the brightness enhancement film, and the brightness enhancement film transmits only polarized light whose polarization direction is such that the polarization direction of light reflected and inverted between the two can pass through the polarizer. Therefore, light such as a backlight can be efficiently used for displaying an image on the liquid crystal display device, and the screen can be brightened.

  A diffusion plate may be provided between the brightness enhancement film and the reflective layer. The polarized light reflected by the brightness enhancement film is directed to the reflective layer or the like, but the installed diffuser plate uniformly diffuses the light passing therethrough and at the same time cancels the polarized state and becomes a non-polarized state. That is, the diffuser plate returns the polarized light to the original natural light state. The light in the non-polarized state, that is, the natural light state is directed to the reflection layer and the like, reflected through the reflection layer and the like, and again passes through the diffusion plate and reenters the brightness enhancement film. Thus, while maintaining the brightness of the display screen by providing a diffuser plate that returns polarized light to the original natural light state between the brightness enhancement film and the reflective layer, etc., at the same time, the unevenness of the brightness of the display screen is reduced, A uniform and bright screen can be provided. By providing such a diffuser plate, it is considered that the first incident light has a moderate increase in the number of repetitions of reflection, and in combination with the diffusion function of the diffuser plate, a uniform bright display screen can be provided.

  As the brightness enhancement film, for example, a dielectric multilayer thin film or a multilayer laminate of thin film films having different refractive index anisotropy, such as a characteristic that transmits linearly polarized light having a predetermined polarization axis and reflects other light. Such as a cholesteric liquid crystal polymer alignment film or a film substrate whose alignment liquid crystal layer is supported on a film substrate, which reflects either left-handed or right-handed circularly polarized light and transmits other light. Appropriate ones such as those shown can be used.

  Therefore, in the brightness enhancement film of the type that transmits linearly polarized light having the predetermined polarization axis as described above, the transmitted light is incident on the polarizing plate with the polarization axis aligned as it is, thereby efficiently transmitting while suppressing absorption loss due to the polarizing plate. Can be made. On the other hand, in a brightness enhancement film of a type that emits circularly polarized light such as a cholesteric liquid crystal layer, it can be incident on a polarizer as it is, but from the viewpoint of suppressing absorption loss, the circularly polarized light is linearly polarized through a retardation plate. It is preferable to make it enter into a polarizing plate. Note that circularly polarized light can be converted to linearly polarized light by using a quarter wave plate as the retardation plate.

  A retardation plate that functions as a quarter-wave plate in a wide wavelength range such as a visible light region has, for example, a retardation layer that functions as a quarter-wave plate for light-color light with a wavelength of 550 nm and other retardation characteristics. The phase difference layer shown, for example, the method of superposing | stacking the phase difference layer which functions as a half-wave plate, etc. can obtain. Accordingly, the retardation plate disposed between the polarizing plate and the brightness enhancement film may be composed of one or more retardation layers.

  In addition, a cholesteric liquid crystal layer having a structure in which two or three or more layers are overlapped with a combination of those having different reflection wavelengths can be obtained to reflect circularly polarized light in a wide wavelength range such as a visible light region. Based on this, transmitted circularly polarized light in a wide wavelength range can be obtained.

  Further, the polarizing plate may be formed by laminating a polarizing plate and two or three or more optical layers like the above-described polarization separation type polarizing plate. Therefore, a reflective elliptical polarizing plate or a semi-transmissive elliptical polarizing plate in which the above-mentioned reflective polarizing plate or transflective polarizing plate and a retardation plate are combined may be used.

  The optical member in which the optical layer is laminated on the polarizing plate can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like. It is excellent in stability and assembly work, and has the advantage of improving the manufacturing process of a liquid crystal display device and the like. For the lamination, an appropriate adhesive means such as a pressure-sensitive adhesive layer can be used. When adhering the polarizing plate and the other optical layer, their optical axes can be set at an appropriate arrangement angle in accordance with the target phase difference characteristic.

  In addition, in each layer such as an optical member or an adhesive layer of the adhesive optical member of the present invention, for example, a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, a nickel complex compound, etc. What gave the ultraviolet absorptivity by systems, such as a system processed with a ultraviolet absorber, etc. may be used.

  The pressure-sensitive adhesive optical member of the present invention can be preferably used for forming various image display devices such as a liquid crystal display device. The liquid crystal display device can be formed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, an adhesive optical member, and an illumination system as necessary, and incorporating a drive circuit. There is no limitation in particular except the point which uses the optical member by invention, It can apply to the former. As the liquid crystal cell, for example, an arbitrary type such as a TN type, an STN type, or a π type can be used.

  An appropriate liquid crystal display device such as a liquid crystal display device in which an adhesive optical member is disposed on one side or both sides of a liquid crystal cell, or a backlight or a reflector used in an illumination system can be formed. In that case, the optical member by this invention can be installed in the one side or both sides of a liquid crystal cell. When optical members are provided on both sides, they may be the same or different. Furthermore, when forming a liquid crystal display device, for example, a single layer of appropriate components such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, and a backlight are provided at appropriate positions. Alternatively, two or more layers can be arranged.

  Next, an organic electroluminescence device (organic EL display device) will be described. Generally, in an organic EL display device, a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate to form a light emitter (organic electroluminescent light emitter). Here, the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, Or a combination of such a light emitting layer and an electron injection layer composed of a perylene derivative, or a combination of these hole injection layer, light emitting layer, and electron injection layer. Are known.

  In organic EL display devices, holes and electrons are injected into the organic light-emitting layer by applying a voltage to the transparent electrode and the metal electrode, and the energy generated by recombination of these holes and electrons excites the phosphor material. Then, light is emitted on the principle that the excited fluorescent material emits light when returning to the ground state. The mechanism of recombination in the middle is the same as that of a general diode, and as can be predicted from this, the current and the emission intensity show strong nonlinearity with rectification with respect to the applied voltage.

  In an organic EL display device, in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and a transparent electrode usually formed of a transparent conductor such as indium tin oxide (ITO) is used as an anode. It is used as. On the other hand, in order to facilitate electron injection and increase luminous efficiency, it is important to use a material having a small work function for the cathode, and usually metal electrodes such as Mg—Ag and Al—Li are used.

  In the organic EL display device having such a configuration, the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, the organic light emitting layer transmits light almost completely like the transparent electrode. As a result, light that is incident from the surface of the transparent substrate at the time of non-light emission, passes through the transparent electrode and the organic light emitting layer, and is reflected by the metal electrode is again emitted to the surface side of the transparent substrate. The display surface of the organic EL display device looks like a mirror surface.

  In an organic EL display device comprising an organic electroluminescent light emitting device comprising a transparent electrode on the surface side of an organic light emitting layer that emits light upon application of a voltage and a metal electrode on the back side of the organic light emitting layer, the surface of the transparent electrode While providing a polarizing plate on the side, a retardation plate can be provided between the transparent electrode and the polarizing plate.

  Since the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, there is an effect that the mirror surface of the metal electrode is not visually recognized by the polarization action. In particular, the mirror surface of the metal electrode can be completely shielded by configuring the retardation plate with a quarter-wave plate and adjusting the angle formed by the polarization direction of the polarizing plate and the retardation plate to π / 4. .

  That is, only the linearly polarized light component of the external light incident on the organic EL display device is transmitted by the polarizing plate. This linearly polarized light becomes generally elliptically polarized light by the phase difference plate, but becomes circularly polarized light particularly when the phase difference plate is a quarter wavelength plate and the angle formed by the polarization direction of the polarizing plate and the phase difference plate is π / 4. .

  This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic thin film, is reflected by the metal electrode, is again transmitted through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized light again on the retardation plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot permeate | transmit a polarizing plate. As a result, the mirror surface of the metal electrode can be completely shielded.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, the evaluation items in Examples and the like were measured as follows. In the examples, “%” is based on weight unless otherwise specified.

<Measurement of weight average molecular weight of (meth) acrylic polymer>
The weight average molecular weight of the produced polymer was measured by GPC (gel permeation chromatography) under the following conditions. In addition, after filtering the 0.1 weight% THF solution of each polymer with a membrane filter (0.45 micrometer), the obtained filtrate was made into the measurement sample.

Analyzing device: manufactured by Tosoh Corporation, HLC-8120GPC
Data processing device: GPC-8020 manufactured by Tosoh Corporation
column:
Sample column: G7000H _XL + GMH _XL + GMH _XL manufactured by Tosoh Corporation
Column size: 7.8mmφ x 30cm each (total 90cm)
Column temperature: 40 ° C
Eluent: THF
Flow rate: 0.8ml / min
Inlet pressure: 1.3 MPa
Injection volume: 100 μl
Detector: Differential refractometer (RI)
The weight average molecular weight was calculated in terms of polystyrene.

<Measurement of peel strength of release liner>
The peeling liner peel force when the optical member with a release liner cut to a size of 50 mm wide × 100 mm long was peeled at a peeling speed of 300 mm / min (peeling angle 180 °) with a universal tensile tester was measured. . The measurement was performed in an environment of 23 ° C. × 50% RH. The value of the obtained peeling force was evaluated according to the following criteria.

When peeling force is less than 0.1 N / 50 mm: ×
When the peel force is 0.1 to 0.4 N / 50 mm: ○
When peeling force is greater than 0.4 N / 50 mm: ×

  When the peeling force is less than 0.1 N / 50 mm, the peeling force is too small, and thus a problem such as the release liner floating easily occurs in a manufacturing process such as punching. On the other hand, when it is larger than 0.4 N / 50 mm, the peeling force becomes too large, and thus the problem that peeling of the release liner becomes difficult during actual use tends to occur.

<Durability evaluation>
The produced optical member (15-inch size: 240 mm × 320 mm) was attached to an alkali-free glass plate (Corning, Corning 1737, 250 × 350 mm, thickness: 0.7 mm), and the pressure was 50 ° C. × 0.5 MPa. Autoclaving was performed for 15 minutes. Thereafter, the sample was stored at 90 ° C. for 500 hours and then returned to room temperature to obtain a sample for evaluation. The state of adhesion to the glass plate after this treatment was confirmed and evaluated according to the following criteria.

When the optical member does not float, peel off, or foam: ○
When the optical member was lifted, peeled off, or slightly foamed, but it did not hinder the use of the present invention:
When the optical member floats, peels off or foams: ×

<Preparation of (meth) acrylic polymer>
[Acrylic polymer (A)]
95 parts by weight of butyl acrylate, 3 parts by weight of acrylic acid, 0.1 part by weight of 2-hydroxybutyl acrylate, 0.050 part by weight of 2,2-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) and 200 of ethyl acetate Part by weight was put into a four-necked flask equipped with a nitrogen introduction tube and a cooling tube, and after sufficiently purging with nitrogen, a polymerization reaction was carried out at 55 ° C. for 20 hours with stirring under a nitrogen stream, and a weight average molecular weight of 2.2 million. A solution of (meth) acrylic polymer (A) was obtained.

[Acrylic polymer (B)]
Nitrogen was introduced into 100 parts by weight of butyl acrylate, 0.1 part by weight of 2-hydroxybutyl acrylate, 0.05 part by weight of 2,2-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) and 200 parts by weight of ethyl acetate. After putting into a four-necked flask equipped with a tube and a cooling tube, and sufficiently purging with nitrogen, a polymerization reaction was carried out at 55 ° C. for 20 hours with stirring under a nitrogen stream, and a (meth) acrylic polymer having a weight average molecular weight of 1.6 million A solution of polymer (B) was obtained.

[Acrylic polymer (C)]
95 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, 0.2 part by weight of benzoyl peroxide and 200 parts by weight of ethyl acetate are put into a four-necked flask equipped with a nitrogen introduction tube and a cooling tube, and the nitrogen is sufficiently substituted. Then, a polymerization reaction was carried out at 65 ° C. for 20 hours with stirring under a nitrogen stream to obtain a solution of a (meth) acrylic polymer (C) having a weight average molecular weight of 600,000.

[Example 1]
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), As a cross-linking agent, 0.6 parts by weight of an isocyanate-based cross-linking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) consisting of a tolylene diisocyanate adduct of trimethylolpropane was uniformly mixed to obtain a pressure-sensitive adhesive composition (1). Prepared.

The pressure-sensitive adhesive composition (1) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

  In the ultraviolet irradiation treatment, an ultraviolet (UV) irradiation apparatus (CV-110Q-G manufactured by Fusion UV Systems Japan) was used, and a metal halide lamp (output 240 W / cm) was used as the light source. The irradiation intensity was measured with a high energy UV radiometer and a UV power pack irradiation measuring instrument (manufactured by Fusion UV Systems Japan). Ultraviolet irradiation was performed using a quartz filter under the conditions of a D bulb, output 100%, irradiation distance 25 mm, and line speed 10 m / min. Table 1 shows the illuminance and light intensity at each wavelength.

The accumulated light quantity under these conditions was 2.0 J / cm ² . The integrated (irradiation) light amount was controlled by the number of irradiations and the irradiation distance with this condition as a reference.

[Example 2]
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), As a cross-linking agent, 0.6 parts by weight of an isocyanate cross-linking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of a tolylene diisocyanate adduct of trimethylolpropane was uniformly mixed, and an adhesive composition (2) was obtained. Prepared.

The pressure-sensitive adhesive composition (2) was applied to a 38 μm thick polyethylene terephthalate film (Mitsubishi Polyester, MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 4.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 3
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An adhesive composition (3) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) comprising an adduct.

The above pressure-sensitive adhesive composition (3) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 4
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 0.5 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent -Adhesive composition (4) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) comprising an adduct.

The pressure-sensitive adhesive composition (4) was applied to a 38 μm thick polyethylene terephthalate film (Mitsubishi Polyester, MRF38: addition-reactive silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 5
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A). 0.15-part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (Lacerti, EsacureKK) as a photoradical generator, trimethylolpropane tolylene diisocyanate as a crosslinking agent A pressure-sensitive adhesive composition (5) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) comprising an adduct.

The pressure-sensitive adhesive composition (5) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition-reactive silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 6
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (6) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of an adduct.

The above pressure-sensitive adhesive composition (6) was applied to a 38 μm-thick polyethylene terephthalate film (MRF38: addition reaction type silicone manufactured by Mitsubishi Polyester Co., Ltd.) subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 1.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 7
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (7) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The pressure-sensitive adhesive composition (7) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 4.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 8
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An adhesive composition (8) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based cross-linking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The pressure-sensitive adhesive composition (8) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 8.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 9
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), Isocyanate-based crosslinking agent comprising 1 part by weight of 1-hydroxycyclohexyl phenyl ketone (manufactured by Ciba Specialty Chemicals Co., Ltd., Irgacure 184) as a photoradical generator, and a tolylene diisocyanate adduct of trimethylolpropane as a crosslinking agent (Japan) A pressure-sensitive adhesive composition (9) was prepared by uniformly mixing 0.6 part by weight of Coronate L) manufactured by Polyurethane.

The pressure-sensitive adhesive composition (9) was applied to a 38 μm thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 10
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), As a cross-linking agent, 0.6 parts by weight of an isocyanate-based cross-linking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of a tolylene diisocyanate adduct of trimethylolpropane was uniformly mixed, and an adhesive composition (10) was obtained. Prepared.

The pressure-sensitive adhesive composition (10) was applied to a 38 μm-thick polyethylene terephthalate film (manufactured by Mitsubishi Polyester Co., Ltd., MRN38: condensation reaction type silicone) so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Comparative Example 1]
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), As a crosslinking agent, 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of a tolylene diisocyanate adduct of trimethylolpropane was uniformly mixed to obtain a pressure-sensitive adhesive composition (11). Prepared.

  The pressure-sensitive adhesive composition (11) was applied to a 38 μm thick polyethylene terephthalate film (manufactured by Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. And dried at 100 ° C. for 5 minutes.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Comparative Example 2]
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (12) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) comprising an adduct.

The pressure-sensitive adhesive composition (12) was applied to a 38 μm-thick polyethylene terephthalate film (MRF38: addition reaction type silicone manufactured by Mitsubishi Polyester Co., Ltd.) subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 12.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Reference Example 1]
0.08 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A), 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (Lamberti, EsacureKK) 5 parts by weight as photoradical generator, trimethylolpropane tolylene diisocyanate as cross-linking agent An pressure-sensitive adhesive composition (13) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The above pressure-sensitive adhesive composition (13) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Reference Example 2]
Isocyanate-based cross-linking agent consisting of a tolylene diisocyanate adduct of trimethylolpropane as a cross-linking agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (A) L) An adhesive composition (14) was prepared by uniformly mixing 0.6 parts by weight.

The pressure-sensitive adhesive composition (14) was applied to a 38 μm-thick polyethylene terephthalate film (manufactured by Mitsubishi Polyester Co., Ltd., MRF38: addition-reactive silicone) so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 11
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (B). The pressure-sensitive adhesive composition (15) was uniformly mixed with 0.2 part by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of a tolylene diisocyanate adduct of trimethylolpropane as a crosslinking agent. Prepared.

The pressure-sensitive adhesive composition (15) was applied to a 38 μm thick polyethylene terephthalate film (manufactured by Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 12
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (B). 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (16) was prepared by uniformly mixing 0.2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The pressure-sensitive adhesive composition (16) was applied to a 38 μm-thick polyethylene terephthalate film (Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) having a silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

Example 13
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (B). 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (17) was prepared by uniformly mixing 0.2 parts by weight of an isocyanate-based crosslinking agent (Nihon Polyurethane Co., Ltd., Coronate L) comprising an adduct.

The pressure-sensitive adhesive composition (17) was applied to a 38 μm-thick polyethylene terephthalate film (MRF38: addition reaction type silicone manufactured by Mitsubishi Polyester Co., Ltd.) subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 8.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Comparative Example 3]
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (B). The pressure-sensitive adhesive composition (18) was uniformly mixed with 0.2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) composed of a tolylene diisocyanate adduct of trimethylolpropane as a crosslinking agent. Prepared.

  The pressure-sensitive adhesive composition (18) was applied to a 38 μm-thick polyethylene terephthalate film (MRF38: addition reaction type silicone manufactured by Mitsubishi Polyester Co., Ltd.) having been subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm And dried at 100 ° C. for 5 minutes.

  The pressure-sensitive adhesive layer thus obtained was transferred to a polarizing film (polyvinyl alcohol film impregnated with iodine, stretched, and a triacetyl cellulose film bonded on both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Reference Example 3]
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (B). 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (Lamberti, EsacureKK) 5 parts by weight as photoradical generator, trimethylolpropane tolylene diisocyanate as cross-linking agent An pressure-sensitive adhesive composition (19) was prepared by uniformly mixing 0.2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The pressure-sensitive adhesive composition (19) was applied to a 38 μm-thick polyethylene terephthalate film (manufactured by Mitsubishi Polyester Co., Ltd., MRF38: addition reaction type silicone) so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

[Comparative Example 4]
0.04 parts by weight of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403) as a silane coupling agent with respect to 100 parts by weight of the solid content of the solution of the (meth) acrylic polymer (C), 1 part by weight of 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (produced by Lamberti, EsacureKK) as a photoradical generator, and tolylene diisocyanate of trimethylolpropane as a crosslinking agent An pressure-sensitive adhesive composition (20) was prepared by uniformly mixing 0.6 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) made of an adduct.

The pressure-sensitive adhesive composition (20) was applied to a 38 μm-thick polyethylene terephthalate film (MRF38: addition reaction type silicone manufactured by Mitsubishi Polyester Co., Ltd.) having been subjected to silicone release treatment so that the dry thickness of the pressure-sensitive adhesive layer was 25 μm. Then, after drying at 100 ° C. for 5 minutes, the pressure-sensitive adhesive layer was subjected to ultraviolet irradiation treatment (irradiation light amount: 2.0 J / cm ² ) with a metal halide lamp.

  The pressure-sensitive adhesive layer thus obtained was transferred onto a polarizing film (polyvinyl alcohol film impregnated with iodine, and after stretching, a triacetyl cellulose film was bonded to both sides via an adhesive), and the pressure-sensitive adhesive of the present invention An attached optical member was obtained.

  According to the said method, said evaluation of the produced optical member with an adhesive was performed. The obtained results are shown in Table 2.

  From the results of Table 2 above, according to the production method of the present invention, in the step of forming the pressure-sensitive adhesive layer on the silicone release liner, when the pressure-sensitive adhesive layer is irradiated with ultraviolet rays (Examples 1 to 13), Thus, it was possible to obtain an optical member pressure-sensitive adhesive layer having excellent durability and easily adjusting the release force of the silicone release liner to an appropriate release force, and an optical member with an adhesive using the same (see FIG. 1).

  On the other hand, when an optical member with a pressure-sensitive adhesive that does not satisfy the configuration of the present invention is used (Comparative Examples 1 to 3), it may be difficult to align an appropriate peeling force and durability in any case. I understand.

  Therefore, it was confirmed that the pressure-sensitive adhesive layer for an optical member having excellent durability and appropriate peeling force and an optical member with a pressure-sensitive adhesive using the same were obtained by the method for producing a pressure-sensitive adhesive layer of the present invention.

Relationship diagram between UV irradiation amount and peeling force in Examples

Claims (13)

  A pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive composition containing a (meth) acrylic polymer having a weight average molecular weight of 1,000,000 to 3,000,000 containing 80% by weight or more of (meth) acrylic acid as a monomer unit on the release-treated surface of a silicone release liner. A method for adjusting the release force of a silicone release liner, comprising a step of providing an agent layer and a step of irradiating the pressure-sensitive adhesive layer with ultraviolet rays.   2. The silicone release agent according to claim 1, wherein the pressure-sensitive adhesive composition further comprises 0.01 to 1 part by weight of a silane coupling agent with respect to 100 parts by weight of the (meth) acrylic polymer. How to adjust the release force of the liner.   The said adhesive composition contains 0.01-3 weight part of isocyanate crosslinking agents further with respect to 100 weight part of said (meth) acrylic-type polymers, The Claim 1 or 2 characterized by the above-mentioned. Method for adjusting the release force of the silicone release liner.   The pressure-sensitive adhesive composition further comprises 0.01 to 3 parts by weight of a photo radical generator with respect to 100 parts by weight of the (meth) acrylic polymer. A method for adjusting the release force of the silicone release liner according to 1.   A pressure-sensitive adhesive composition comprising a pressure-sensitive adhesive composition containing a (meth) acrylic polymer having a weight average molecular weight of 1,000,000 to 3,000,000 containing 80% by weight or more of (meth) acrylic acid as a monomer unit on the release-treated surface of a silicone release liner. A method for producing a pressure-sensitive adhesive layer with a silicone release liner, comprising the step of producing a pressure-sensitive adhesive layer comprising a step of providing an adhesive layer, the method comprising the step of adjusting the peeling force of the silicone release liner by ultraviolet irradiation.   The silicone release agent according to claim 5, wherein the pressure-sensitive adhesive composition further contains 0.01 to 1 part by weight of a silane coupling agent with respect to 100 parts by weight of the (meth) acrylic polymer. The manufacturing method of an adhesive layer with a liner.   The said adhesive composition contains 0.01-3 weight part of isocyanate crosslinking agents further with respect to 100 weight part of said (meth) acrylic-type polymers, The Claim 5 or 6 characterized by the above-mentioned. The manufacturing method of an adhesive layer with a silicone release liner.   The said adhesive composition contains 0.01-3 weight part of photoradical generators further with respect to 100 weight part of said (meth) acrylic-type polymers, The any one of Claims 5-7 characterized by the above-mentioned. The manufacturing method of the adhesive layer with a silicone release liner as described in any one of. In the manufacturing method of the adhesive layer with a silicone release liner in any one of Claims 5-8,
The manufacturing method of the adhesive layer with a silicone release liner adjusted so that the peeling force of a silicone release liner may become the range of 0.1-0.4N / 50mm by the process of irradiating the said adhesive layer with an ultraviolet-ray.   The adhesive layer for optical members manufactured by the method in any one of Claims 5-9.   The adhesive sheet for optical members which has the adhesive layer for optical members manufactured by the method in any one of Claims 5-9.   An optical member with an adhesive, wherein the optical member pressure-sensitive adhesive layer produced by the method according to claim 5 is formed on one side or both sides of the optical member. An image display device using at least one optical member with an adhesive according to claim 12.

Images