TWI717384B - Polarizing film with adhesive layer, optical component and image display device - Google Patents

Abstract

The present invention is a polarizing film with an adhesive layer, which has a polarizing film and an adhesive layer A provided on the polarizing film. The aforementioned polarizing film is a single side with a transparent protective film only on one side of a polarizer with a thickness of 10μm or less To protect the polarizing film, the adhesive layer A is provided on the side of the polarizer that does not have the transparent protective film, and the moisture permeability of the adhesive layer A is 300 g/(m ² · 24h) or less and the thickness is 50 μm or less. The polarizing film with the adhesive layer can inhibit the deterioration of the polarizer of the single-sided protective polarizing film under high temperature and humid environment.

Description

Polarizing film with adhesive layer, optical component and image display device

Technical Field The present invention relates to an adhesive layer-attached polarizing film and an optical member including the adhesive layer-attached polarizing film. In addition, the present invention relates to an image display device including the polarizing film with the adhesive layer and/or the optical member.

2. Description of the Related Art In recent years, image display devices such as liquid crystal display devices are strongly required to be lighter and thinner, and various optical components such as polarizing films used in image display devices are also eagerly desired to be thinner and lighter. Various types of thinness are being discussed. Manufacturing method of polarizing film.

As for the manufacturing method of thin polarizing film, for example, it is known that a thin polyvinyl alcohol (PVA) polymer layer formed on a resin substrate with a certain thickness is integrated with the resin substrate. A method in which a thin polarizing film is formed on a resin substrate by uniaxial stretching (for example, refer to Patent Document 1); and a resin layer made of PVA resin is formed on one side of the substrate film The laminated film is stretched uniaxially in the longitudinal direction of the free end at a specific stretching ratio to obtain a stretched film, and the stretched film is dyed with a dichroic dye to form a thin polarizer (for example, refer to Patent Document 2). Prior technical literature Patent literature

Patent Document 1: Japanese Patent No. 4693205 Patent Document 2: Japanese Patent No. 5048120 Specification

SUMMARY OF THE INVENTION The problem to be solved by the invention is that the thinned polarizing films obtained in the aforementioned patent documents 1 and 2 are all single-sided protective polarizing films in which a transparent protective film protects one side of a polarizer, and the polarizing film can be protected on one side The polarizer side is bonded to various optical components through the adhesive layer and incorporated into the image display device.

Although the aforementioned single-sided protective polarizing film is excellent from the viewpoint of film formation, it has the following problem: when the single-sided protective polarizing film is exposed to a high-temperature humidified environment in a state where it has been bonded to an adherend, Moisture transfers to the polarizer, causing deterioration of the polarizer (depolarization occurs).

Therefore, the object of the present invention is to provide a polarizing film with an adhesive layer, which can suppress the deterioration of the polarizer of the single-sided protective polarizing film in a high-temperature humidified environment. In addition, the object of the present invention is to provide a polarizing film with an adhesive layer, wherein the adhesive layer of the polarizing film with an adhesive layer is a light diffusion adhesive layer. In addition, the object of the present invention is to provide an optical member including the polarizing film with the adhesive layer, and to provide an image display device including the polarizing film with the adhesive layer and/or the optical member. Means to solve the problem

In order to solve the aforementioned problems, the inventors have found the following polarizing film with an adhesive layer as a result of in-depth investigations, and completed the present invention.

That is, the present invention relates to a polarizing film with an adhesive layer, which has a polarizing film and an adhesive layer A provided on the polarizing film. The polarizing film with the adhesive layer is characterized in that: the aforementioned polarizing film is only in thickness A single-sided protective polarizing film with a transparent protective film on one side of a polarizer of less than 10μm, the adhesive layer A is provided on the side of the polarizer without the transparent protective film; the moisture permeability of the adhesive layer A is 300g/(m ²・24h) or less, and the thickness is 50μm or less.

The aforementioned adhesive layer A is preferably an adhesive layer containing a rubber-based polymer as a main component.

The aforementioned rubber-based polymer is preferably one or more rubber-based polymers selected from the group consisting of styrene-based thermoplastic elastomers, polyisobutylene, and butyl rubber.

The aforementioned adhesive layer A preferably further contains an adhesion imparting resin.

The aforementioned adhesive layer A may be a light-diffusing adhesive layer A1 containing light-diffusing fine particles.

The haze of the aforementioned light diffusion adhesive layer A1 is preferably 10-95%.

The aforementioned light diffusing particles are preferably silicone resin particles or styrene resin particles.

The volume average particle diameter of the aforementioned light diffusing fine particles is preferably 1 to 4 μm.

Furthermore, the present invention relates to an optical member, which is characterized by having the aforementioned polarizing film with an adhesive layer and a brightness improving film, the brightness improving film being provided on the adhesive layer of the polarizing film with the adhesive layer A or adhesive layer A1 side.

In the above-mentioned optical member, the brightening film may be further provided with a thin sheet on the side of the polarizing film without an adhesive layer.

The present invention further relates to an image display device characterized by including one or more selected from the group consisting of the polarizing film with the adhesive layer and the optical member. Invention effect

The adhesive layer-attached polarizing film of the present invention uses a single-sided protective polarizing film, so it can be thinned, and because the moisture permeability of the adhesive layer A is 300 g/(m ² · 24h) or less and the thickness is 50 μm or less, it can Suppress the deterioration of the polarizer in a high-temperature humidified environment. That is, since the adhesive layer A of the polarizing film with an adhesive layer of the present invention has a low moisture permeability and a thickness of 50 μm or less, it can suppress the transfer of moisture to the polarizer even when exposed to a high-temperature humidified environment. Suppress the depolarization caused by the deterioration of the polarizer. In addition, when the adhesive layer A is the light-diffusing adhesive layer A1, the polarizing film with the adhesive layer of the present invention has a light-diffusing function, so it can also be used to replace the diffusion sheet used in image display devices. Make the image display device thinner. In addition, the use of the aforementioned polarizing film with an adhesive layer with a light diffusion function on the backlight side can eliminate the deviation of light from the backlight and achieve a more uniform display. In addition, the optical member and image display device of the present invention have high reliability because they include the polarizing film with the adhesive layer of the present invention.

Mode for implementing the invention 1. Polarizing film with adhesive layer The polarizing film with adhesive layer of the present invention has a polarizing film and an adhesive layer A provided on the polarizing film, and the polarizing film with the adhesive layer is It is characterized in that: the aforementioned polarizing film is a single-sided protective polarizing film having a transparent protective film only on one side of a polarizer with a thickness of 10 μm or less, and the adhesive layer A is provided on the side of the polarizer that does not have the aforementioned transparent protective film; and, The moisture permeability of the aforementioned adhesive layer A is 300 g/(m ² · 24h) or less, and the thickness is 50 μm or less.

The structure of the polarizing film with an adhesive layer of the present invention will be described in detail with reference to the drawings. In addition, the size of each structure in FIG. 1 shows an example, and this invention is not limited to this.

As shown in FIG. 1, the polarizing film 1 with an adhesive layer of the present invention has an adhesive layer A (3 in FIG. 1) on at least one side of the polarizing film 2. In addition, the polarizing film 2 only has a transparent protective film 5 on one side of the polarizing member 4, and the adhesive layer A (3) only needs to be provided on the side of the polarizing member 4 that does not have the transparent protective film 5 (ie, the polarizing member 4). Side). The aforementioned polarizer 4 and the adhesive layer A (3) do not necessarily have to be in contact, but from the viewpoint that the effects of the present invention can be significantly exhibited, they are preferably in contact.

In addition, on the side of the transparent protective film 5 without the polarizer 4, an adhesive layer B (not shown) may be further provided. Regarding the adhesive layer B provided on the transparent protective film 5, it may be the adhesive layer A with a specific moisture permeability described above, or an adhesive layer other than it. The adhesive layer B system will be described later.

(1) Adhesive layer A The adhesive layer A used in the present invention is characterized in that its moisture permeability is 300 g/(m ² · 24h) or less, and its thickness is 50 μm or less.

The moisture permeability of the adhesive layer A used in the present invention is 300 g/(m ² ·24h) or less. Due to the low water vapor permeability, it is one that can suppress the deterioration of the polarizer due to moisture or the like. The aforementioned water vapor transmission rate is the water vapor transmission rate (water vapor transmission rate) under the conditions of 40° C. and 92% RH at a thickness of 50 μm of the adhesive layer, and the measurement method can be measured by the method described in the examples.

The aforementioned moisture permeability is 300g/(m ² ·24h) or less, preferably 200g/(m ² ·24h) or less, more preferably 100g/(m ² ·24h) or less, particularly preferably 60g/(m ² · 24h) or less. In addition, the lower limit value of the moisture permeability is not particularly limited, but ideally, it is preferably not to allow water vapor to penetrate at all (that is, 0 g/(m ² · 24h)). If the moisture permeability of the adhesive layer A is in the aforementioned range, the transfer of moisture to the polarizer can be suppressed, the elimination of polarized light due to the deterioration of the polarizer can be suppressed, and an adhesive layer-attached polarizing film with high optical reliability can be made.

The thickness of the adhesive layer A used in the present invention is 50 μm or less, preferably 30 μm or less, more preferably 20 μm or less, and still more preferably 10 μm or less. In addition, the lower limit value of the thickness of the adhesive layer A is not particularly limited, but from the viewpoint of durability, it is preferably 1 μm or more, and more preferably 5 μm or more. The adhesive layer A used in the present invention has a low water vapor transmission rate and a thickness of 50 μm or less as described above, so it can inhibit the transfer of moisture to the polarizer in a high-temperature humidified environment. As a result, it is possible to suppress the elimination of polarized light due to the deterioration of the polarizer, and it is possible to form a polarizing film with an adhesive layer with high optical reliability.

The transfer of moisture from the single-sided protective film to the polarizer is considered to come from the adhesive surface of the adhesive layer A provided on the single-sided protective polarizing film (that is, the adhesive layer A is on the opposite side to the side where the polarizer is provided Transfer of moisture from the surface) and moisture from the side of the adhesive layer A. Generally speaking, on the side opposite to the side of the adhesive layer A with the polarizer, it is bonded with: display panels, glass plates and other substrates, although it can suppress the transfer of moisture from the surface direction of the adhesive layer A to some extent , But it is difficult to suppress water transfer from the side part of the adhesive layer A. The adhesive layer A used in the present invention has low moisture permeability and a thickness of 50 μm or less. Due to the small area of the side part of the adhesive layer A, the amount of moisture transfer from the side part can be suppressed, and the polarized light can be suppressed. Elimination of polarization caused by component deterioration.

As for the adhesive layer A used in the present invention, as long as the moisture permeability and thickness are within the aforementioned ranges, its composition is not limited. For example, rubber-based adhesive compositions and acrylic adhesive compositions can be suitably used. , Polysiloxane-based adhesive composition, urethane-based adhesive composition, etc. Among these, from the viewpoint of moisture permeability, a rubber-based adhesive composition using a rubber-based polymer as a base polymer is preferred. The adhesive layer A used in the present invention preferably contains the aforementioned rubber-based polymer as a main component. Here, the "main component" means that the adhesive layer A (or the total solid content of the adhesive composition forming the adhesive layer A) contains 40% by weight or more of the rubber-based polymer.

The aforementioned rubber-based polymer is a polymer that exhibits rubber elasticity in a temperature range around room temperature. As for the rubber-based polymer, it is preferable to use one or more selected from the group consisting of natural rubber, synthetic rubber, and thermoplastic elastomer.

As for the aforementioned synthetic rubbers, examples include: polyisobutylene (PIB), butadiene rubber (BR), butyl rubber (IIR), isoprene rubber (IR), styrene-butadiene rubber (SBR) , Chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR), butadiene-isoprene-styrene random copolymer, isoprene-styrene random copolymer, EPR (Binary ethylene-propylene rubber), EPT (ternary ethylene-propylene rubber), acrylic rubber, urethane rubber, etc. Among them, from the viewpoint of transparency and light resistance, polyisobutylene (PIB) and butyl rubber (IIR) are preferred, and polyisobutylene (PIB) is more preferred.

As for the aforementioned thermoplastic elastomer, for example, styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), benzene Ethylene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene-styrene block copolymer (SEPS, SIS hydrogenated product), styrene-ethylene-propylene block copolymer (SEP , Styrene-isoprene block copolymer hydride), styrene-isobutylene-styrene block copolymer (SIBS) and other styrene-based thermoplastic elastomers (styrene-based block copolymer); polyamine Carbamate-based thermoplastic elastomers; polyester-based thermoplastic elastomers; blend-based thermoplastic elastomers such as a polymer blend of polypropylene and EPT (ternary ethylene-propylene rubber). Among them, from the viewpoint of transparency and light resistance, styrene-based thermoplastic elastomers are preferred, and styrene-ethylene-propylene-styrene block copolymers (hydrogenated products of SEPS and SIS) are more preferred. .

The aforementioned adhesive composition contains a rubber-based polymer as a base polymer. The content of the rubber-based polymer in the adhesive composition is preferably 40% by weight or more, more preferably 50% by weight or more, and still more preferably 60% by weight. More than weight%. The upper limit of the rubber-based polymer content is not particularly limited, and it may be 100% by weight or less, preferably 95% by weight or less.

From the point of view of adhesion to adherends, that is, polarizers, optical films, glass, display panels, etc., the adhesive composition preferably further includes an adhesion-imparting resin.

The aforementioned adhesion-imparting resins include: terpene-based adhesion-imparting resins, phenol-series adhesion-imparting resins, rosin-type adhesion-imparting resins, petroleum resin-type adhesion-imparting resins, etc., which may be used alone or in combination of 2 Use more than one species. Among these, from the viewpoint of transparency and adhesiveness, the terpene-based adhesion-imparting resin is preferred.

As for the terpene-based adhesion-imparting resin, for example, terpene polymers such as α -pinene polymer, β -pinene polymer, and dipentene polymer, and the aforementioned terpene polymer Modified terpene resins etc. modified (phenol modification, styrene modification, aromatic modification, hydrogenation modification, hydrocarbon modification, etc.). Examples of the above modified terpene resin may include terpene phenol resin, styrene modified terpene resin, aromatic modified terpene resin, hydrogenated terpene resin (hydrogenated terpene resin), and the like. Examples of the hydrogenated terpene resin referred to herein include hydrogenated terpene polymers, other modified terpene resins, and hydrogenated terpene phenol resins.

As for the adhesion-imparting resin, for example, commercially available products such as Clearon series and Polyster series manufactured by Yasuhara Chemical Co., Ltd., Super Ester series manufactured by Arakawa Chemical Industry Co., Ltd., Pen cell series, and Pine Crystal series can be used.

Although the softening point (softening temperature) of the aforementioned adhesion imparting resin is not particularly limited, for example, the softening point is preferably about 80°C or higher, more preferably about 100°C or higher. Although the upper limit of the softening point of the adhesion imparting resin is not particularly limited, for example, it is preferably about 200°C or lower, and more preferably about 180°C or lower. In addition, the softening point of the adhesion-imparting resin referred to herein is defined as the value measured by the softening point test method (Ring and Ball method) specified in either JIS K5902 and JIS K2207.

With respect to 100 parts by weight of the base polymer, the amount of the adhesion imparting resin added is preferably 100 parts by weight or less, more preferably 80 parts by weight or less, and still more preferably 50 parts by weight or less. In addition, although the lower limit value of the amount of adhesion imparting resin is not particularly limited, it is preferably 0 parts by weight or more, more preferably 1 part by weight or more, and still more preferably 5 parts by weight or more. By setting the usage amount of the adhesion-imparting resin in the aforementioned range, it is preferable to ensure heat resistance and adhesiveness.

Furthermore, in the aforementioned adhesive composition, an organic solvent can be added as a diluent. Although there are no particular limitations on the diluent, for example, hexane, heptane, toluene, xylene, dimethyl ether, etc., can be used alone or in combination of two or more. Among these, toluene is preferred.

Although the addition amount of the diluent is not particularly limited, it is preferably about 50 to 500 parts by weight, more preferably about 100 to 300 parts by weight relative to 100 parts by weight of the base polymer in the adhesive composition. Since the addition amount of the diluent is in the aforementioned range, it is ideal from the viewpoint of coating properties to a support or the like.

The aforementioned adhesive composition may further include any appropriate additives. Specific examples of additives include crosslinking agents (for example, polyisocyanates, epoxy compounds, alkyl etherified melamine compounds, etc.), plasticizers, fillers, anti-aging agents, and the like. The type, combination, and amount of additives added to the adhesive composition can be appropriately set according to the purpose. The content (total amount) of the aforementioned additives in the adhesive composition is preferably 50% by weight or less, more preferably 40% by weight or less, and still more preferably 30% by weight or less.

(Light diffusion adhesive layer A1) The aforementioned adhesive layer A can be made into a light diffusion adhesive layer A1 containing light diffusing fine particles. When the adhesive layer A is a light-diffusing adhesive layer A1, it is preferable because it can impart a light-diffusing function to the polarizing film with the adhesive layer of the present invention.

As for the light diffusing fine particles, any suitable ones can be used. Specific examples include inorganic microparticles, polymer microparticles, and the like. Among these, polymer microparticles are preferred.

Regarding the material of the aforementioned polymer particles, for example, polysiloxane resin, styrene resin, methacrylic resin (for example, polymethyl methacrylate), polystyrene resin, polyurethane Ester resin, melamine resin. Since these resins have excellent dispersibility to the adhesive composition and have a proper refractive index difference with the adhesive composition, a light diffusion adhesive layer A1 with excellent light diffusion performance can be obtained. Among them, polysiloxane resin and styrene resin are particularly preferred.

The shape of the light diffusing fine particles may be, for example, a true spherical shape, a flat shape, or an indefinite shape. The light diffusing fine particles may be used alone or in combination of two or more kinds.

The refractive index of the light diffusing fine particles used in the present invention is preferably lower than the refractive index of the aforementioned adhesive composition. The aforementioned "refractive index of the adhesive composition" refers to the refractive index of the adhesive composition that does not contain light diffusing fine particles (that is, the adhesive composition before adding the light diffusing fine particles). The refractive index of the light diffusing fine particles is preferably 1.30 to 1.70, more preferably 1.40 to 1.65. If the refractive index of the light diffusing fine particles is in the aforementioned range, the difference in refractive index with the adhesive composition can be made into the desired range. As a result, the light diffusing adhesive layer A1 having the desired haze value can be obtained. good.

The absolute value of the refractive index difference between the light diffusing fine particles and the adhesive composition is preferably more than 0 and 0.2 or less, more preferably more than 0 and 0.15 or less, and still more preferably 0.01 to 0.13.

The volume average particle diameter of the light diffusing fine particles is preferably about 1 to 4 μm, and more preferably about 2 to 4 μm. If the volume average particle diameter of the light-diffusing fine particles is within the aforementioned range, it is preferable that the light-diffusing adhesive layer A1 having a desired haze value can be obtained by combining with the aforementioned adhesive composition. In addition, the volume average particle size can be measured, for example, using an ultracentrifugal automatic particle size distribution measuring device.

Although the content of the light diffusing fine particles in the light diffusing adhesive layer A1 is not particularly limited, it is preferably 0.3 to 50% by weight, more preferably 3 to 48% by weight, and still more preferably 3 to 30% by weight. By setting the blending amount of the light diffusing fine particles within the aforementioned range, a light diffusing adhesive layer A1 having excellent light diffusing performance can be obtained.

Although the haze of the aforementioned light diffusion adhesive layer A1 is not particularly limited, it is preferably 10-95%, more preferably 20-85%, and still more preferably 30-70%. By setting the haze value in the aforementioned range, the desired diffusion performance can be obtained, and the occurrence of moire and flicker can be suppressed well. The light diffusion performance of the light diffusion adhesive layer A1 can be controlled by adjusting the material of the matrix (adhesive), the material of the light diffusing fine particles, the volume average particle size, and the blending amount.

The method for forming the aforementioned adhesive layer A (or A1) will be described later.

(2) Polarizing film The polarizing film used in the present invention is a single-sided protective polarizing film having a transparent protective film on only one side of the polarizer.

In the present invention, a thin polarizer with a thickness of 10 μm or less is used. From the viewpoint of thinning, the thickness is preferably 1 to 7 μm. Such a thin polarizer has less unevenness in thickness, is excellent in visibility, and has less dimensional changes, so it is excellent in durability, and furthermore, it is preferable that the thickness of the polarizing film can be reduced in thickness.

For thin polarizers, representative examples include Japanese Patent Application Publication No. 51-069644, Japanese Patent Application Publication No. 2000-338329, International Publication No. 2010/100917 or Japanese Patent Application Publication No. 2014-59328 and A thin polarizing film described in JP 2012-73563 A. These thin polarizing films can be obtained by a manufacturing method including the following steps: a step of stretching a polyvinyl alcohol-based resin (hereinafter, also referred to as a PVA-based resin) layer and a resin substrate for stretching in a laminated state and dyeing step. According to this manufacturing method, even if the PVA-based resin layer is thin, it is supported by the resin base material for stretching and can be stretched without defects (breaks due to stretching, etc.).

With regard to the aforementioned thin polarizing film, in the manufacturing method including the stretching step and the dyeing step in the state of a laminate, it is preferable to use the following at the point that it can stretch at a high magnification and can improve the polarization performance. Obtained by the method of preparation of the above steps: In the International Publication No. 2010/100917 Specification, or Japanese Unexamined Patent Publication No. 2014-059328 and Japanese Unexamined Patent Publication No. 2012-073563, the extension step in the boric acid aqueous solution is described. Jia is also obtained by a manufacturing method including the following steps: prior to stretching in an aqueous solution of boric acid as described in JP 2014-059328 A and JP 2012-073563 A, auxiliary aerial stretching is performed A step of.

As for the material forming the transparent protective film provided on one side of the aforementioned polarizer, it is preferably one having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and the like. For example, examples include polyester-based polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose-based polymers such as cellulose diacetate and triacetyl cellulose, and polyethylene terephthalate and polyethylene naphthalate; Acrylic polymers such as methyl acrylate, styrene polymers such as polystyrene and acrylonitrile/styrene copolymer (AS resin), polycarbonate polymers, etc. Also, examples include: polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure, polyolefin polymers such as ethylene and propylene copolymers, vinyl chloride polymers, nylon, and aromatics Amide-based polymers such as polyamides, imine-based polymers, tungsten-based polymers, polyether tungsten-based polymers, polyether ether ketone-based polymers, polyphenylene sulfide-based polymers, and vinyl alcohol-based polymers , Vinylidene chloride polymer, vinyl butyral polymer, aryl ester polymer, polyoxymethylene polymer, epoxy polymer, or blend of the aforementioned polymers As an example of the polymer forming the aforementioned transparent protective film. The transparent protective film can also be formed as a cured layer of thermosetting and ultraviolet curing resins such as acrylic, urethane, acrylic urethane, epoxy, and silicone resins.

The thickness of the protective film can be appropriately determined, but it is generally about 1 to 500 μm due to workability such as strength and handleability, and film properties.

The aforementioned polarizer and the protective film are usually in close contact with each other through an aqueous adhesive or the like. Examples of water-based adhesives include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl latex, water-based polyurethane, and water-based polyester. In addition to the above, the adhesive for the polarizer and the transparent protective film may include ultraviolet curing type adhesives, electron beam curing type adhesives, and the like. Adhesives for electron beam hardening polarizing films show suitable adhesion to the various transparent protective films mentioned above. In addition, the adhesive used in the present invention may contain a metal compound filler.

On the surface of the transparent protective film that is not adhered to the polarizing member, a hard coat layer or anti-reflection treatment or treatment for the purpose of anti-sticking, diffusion and anti-glare can be formed.

(3) Polarizing film with adhesive layer The polarizing film with adhesive layer of the present invention can be achieved by directly applying the adhesive composition to the polarizer of the single-sided protective polarizing film, and removing the solvent by heating and drying. , And the adhesive layer A (or A1) is formed on the polarizer. In addition, the adhesive layer A (or A1) that has been formed on a support or the like can be transferred to the polarizer of the aforementioned single-sided protective polarizing film to form a polarizing film with an adhesive layer.

Regarding the coating method of the adhesive composition, various methods can be used. Specifically, for example, a roll coating method, a contact sizing roll coating method, a gravure coating method, a reverse roll coating method, a rolling brush method, a spray method, a dip roll coating method, a bar coating method, Methods such as blade coating method, pneumatic blade coating method, curtain coating method, lip coating method, extrusion coating method by die coater, etc.

The aforementioned heating and drying temperature is preferably about 30°C to 200°C, preferably 40°C to 180°C, and more preferably 80°C to 150°C. By setting the heating temperature in the above range, the adhesive layer A (or A1) having excellent adhesive properties can be obtained. For drying time, a suitable and appropriate time can be used. The drying time is preferably about 5 seconds to 20 minutes, more preferably 30 seconds to 10 minutes, and still more preferably 1 minute to 8 minutes.

As for the aforementioned support, for example, a sheet (separator) subjected to peeling treatment can be used. For the release-treated sheet, it is preferable to use a silicone release liner.

As for the constituent materials of the separator, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and non-woven fabrics, and meshes ( Net), foamed sheets, metal foils, and laminates of these and other suitable thin leaf bodies, etc., from the viewpoint of excellent surface smoothness, plastic films can be suitably used.

As for the aforementioned plastic film, for example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, poly Ethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, etc.

The thickness of the aforementioned separator is usually 5 to 200 μm, preferably about 5 to 100 μm. The aforementioned separators can also be subjected to mold release and antifouling treatment, coating type, kneading, etc., caused by silicone, fluorine, long-chain alkyl, or fatty acid amide-based mold release agents and silica powder. Antistatic treatment such as combined type and vapor deposition type. In particular, by appropriately performing peeling treatments such as silicone treatment, long-chain alkyl treatment, and fluorine treatment on the surface of the separator, the peelability from the adhesive layer A (or A1) can be further improved.

In addition, it is used in the production of the above-mentioned polarizing film with adhesive layer. The peeled-off sheet can be directly used as a separator for the polarizing film with adhesive layer, which can simplify the process.

Furthermore, in the aforementioned polarizing film with an adhesive layer, when the adhesive layer A (or A1) is formed, an anchor layer may be formed on the surface of the polarizer, or may be subjected to corona treatment, plasma The adhesive layer is formed after various easy bonding treatments such as treatment. In addition, easy bonding treatment can also be performed on the surface of the adhesive layer A (or A1).

The adhesive layer-attached polarizing film of the present invention uses a single-sided protective polarizing film with a polarizer thickness of 10 μm or less, so even the adhesive layer-attached polarizing film can be thinned as a whole. As far as the thickness of the polarizing film with the adhesive layer is concerned, it can be made 35μm or less.

(4) Other layers The adhesive layer-attached polarizing film of the present invention may include, for example, an adhesive layer B other than the adhesive layer A in addition to the aforementioned polarizing film and adhesive layer A (or A1). Specifically, for example, another adhesive layer B may be further formed on the transparent protective film side of the polarizing film to which the adhesive layer is attached. The adhesive layer B is not particularly limited, and may be the aforementioned adhesive layer A and light diffusion adhesive layer A1, and an adhesive layer formed of an adhesive composition containing various other base polymers may be suitably used .

The type of the aforementioned base polymer is not particularly limited, and examples thereof include various polymers such as (meth)acrylic polymers, polysiloxane polymers, and urethane polymers. Among these base polymers, (meth)acrylic acid is suitable from the viewpoint of excellent optical transparency, suitable adhesive properties such as wettability, cohesiveness and adhesion, and excellent weather resistance and heat resistance. Department of polymers. Hereinafter, the acrylic adhesive of the forming material of the adhesive layer B will be described; the acrylic adhesive is polymerized with a (meth)acrylic polymer containing alkyl (meth)acrylate as a monomer unit as a base. Things.

The aforementioned (meth)acrylic polymer can be obtained by polymerizing monomer components containing alkyl (meth)acrylate, which is at the end of the ester group. Has an alkyl group with 4 to 24 carbon atoms. In addition, the alkyl (meth)acrylate is referred to as alkyl acrylate and/or alkyl methacrylate, and has the same meaning as (meth) in the present invention.

Examples of alkyl (meth)acrylates include those having a linear or branched alkyl group having 4 to 24 carbon atoms. The alkyl (meth)acrylate can be used alone or in combination of two or more.

The (meth)acrylic polymer related to the aforementioned adhesive layer B preferably contains the most butyl acrylate as a monomer unit from the viewpoint of controlling storage modulus, processability, storage property, and durability.

In the present invention, the alkyl (meth)acrylate having the aforementioned alkyl group having 4 to 24 carbon atoms at the end of the ester is relative to the total amount of monofunctional monomer components forming the (meth)acrylic polymer. It is preferably 40% by weight or more, more preferably 50% by weight or more, and still more preferably 60% by weight or more.

In the monomer component forming the (meth)acrylic polymer, a copolymerized monomer other than the alkyl (meth)acrylate may be contained as a monofunctional monomer component. Examples of such copolymerized monomers include cyclic nitrogen-containing monomers, hydroxyl group-containing monomers, carboxyl group-containing monomers, and cyclic ether group-containing monomers.

In the present invention, the aforementioned copolymerized monomer can be used as the remaining part of the aforementioned alkyl (meth)acrylate in the monomer component, and is relative to the monofunctionality of forming (meth)acrylic polymer The total amount of monomer components is preferably 60% by weight or less, more preferably 50% by weight or less, and still more preferably 40% by weight or less.

In addition to the foregoing, various copolymerizable monomers having polymerizable functional groups having unsaturated double bonds such as (meth)acrylic groups or vinyl groups, silicon atom-containing silane-based monomers, and the like can also be used.

Moreover, in the monomer components formed in the (meth)acrylic polymer used in the present invention, in addition to the monofunctional monomers exemplified above, in order to adjust the cohesive force of the adhesive, it may contain polyfunctional monomer.

The amount of the polyfunctional monomer used varies depending on its molecular weight and number of functional groups, but it is preferably 3 parts by weight or less, more preferably 2 parts by weight or less, with respect to 100 parts by weight of the total monofunctional monomers. Preferably, it is 1 part by weight or less. Furthermore, although the lower limit value is not particularly limited, it is preferably 0 part by weight or more, and more preferably 0.001 part by weight or more. Since the usage amount of the multifunctional monomer is within the aforementioned range, the adhesive force can be improved.

For the production of such (meth)acrylic polymers, known production methods such as radiation polymerization such as solution polymerization and ultraviolet polymerization, various radical polymerizations such as bulk polymerization and emulsion polymerization can be appropriately selected. In addition, the obtained (meth)acrylic polymer may be any of random copolymers, block copolymers, graft copolymers, and the like.

The polymerization initiator, chain transfer agent, emulsifier, etc. used in radical polymerization are not particularly limited, and known ones can be appropriately selected and used. In addition, the weight average molecular weight of the (meth)acrylic polymer can be controlled by the usage amount of the polymerization initiator and the chain transfer agent, and the reaction conditions, and the usage amount can be adjusted appropriately according to the type of the polymerization initiator and the chain transfer agent.

In addition, when the (meth)acrylic polymer is produced by active energy ray polymerization, it can be produced by polymerizing the aforementioned monomer components by irradiating active energy rays such as electron beams and ultraviolet rays. When the active energy ray polymerization is carried out by electron beam, it is not particularly necessary for the monomer component to contain a photopolymerization initiator. However, when the active energy ray polymerization is carried out by ultraviolet polymerization, it is particularly possible to shorten In view of the advantages of the polymerization time, the monomer component can contain a photopolymerization initiator. A photopolymerization initiator can be used individually by 1 type or in combination of 2 or more types. When the aforementioned monomer components are irradiated with radiation, a part of the monomer components can be used to form a slurry beforehand.

The photopolymerization initiator is not particularly limited, and known ones can be appropriately selected and used. The addition amount thereof can also be used in an amount normally used.

唑啉系交聯劑、吖

(aziridine)系交聯劑、矽烷系交聯劑、烷基醚化三聚氰胺系交聯劑、金屬螯合物系交聯劑、過氧化物等交聯劑。交聯劑能單獨使用1種或組合2種以上。就前述交聯劑而言，宜使用異氰酸酯系交聯劑、環氧系交聯劑。The adhesive composition forming the aforementioned adhesive layer B can contain a crosslinking agent. As for the crosslinking agent, it includes: isocyanate crosslinking agent, epoxy crosslinking agent, polysiloxane crosslinking agent,

Oxazoline-based crosslinking agent, acridine

(Aziridine) type crosslinking agent, silane type crosslinking agent, alkyl etherified melamine type crosslinking agent, metal chelate type crosslinking agent, peroxide and other crosslinking agents. A crosslinking agent can be used individually by 1 type or in combination of 2 or more types. As for the aforementioned crosslinking agent, an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent are preferably used.

The above-mentioned crosslinking agent can be used alone or in combination of two or more, but the overall content is preferably 0.01 with respect to 100 parts by weight of the aforementioned (meth)acrylic polymer The aforementioned crosslinking agent is contained in the range of ~5 parts by weight. The content of the crosslinking agent is preferably 0.01 to 4 parts by weight, more preferably 0.02 to 3 parts by weight.

In addition, an organic crosslinking agent and a polyfunctional metal chelate compound may be used in combination as a crosslinking agent.

In the adhesive composition forming the aforementioned adhesive layer B, in order to increase the adhesive force, a (meth)acrylic oligomer may be contained.

Furthermore, the adhesive composition forming the aforementioned adhesive layer B may contain a silane coupling agent. Relative to 100 parts by weight of the (meth)acrylic polymer, the blending amount of the silane coupling agent is preferably 1 part by weight or less, more preferably 0.01 to 1 part by weight, and still more preferably 0.02 to 0.6 part by weight.

As for the silane coupling agent that can be used preferably, there can be mentioned: 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl Silicone coupling agents containing epoxy groups such as methyl diethoxysilane, 2-(3,4 epoxycyclohexyl) ethyl trimethoxysilane, etc.; 3-aminopropyl trimethoxysilane, N- 2-(Aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylene)propylamine, N-benzene -Γ-aminopropyltrimethoxysilane and other silane coupling agents containing amine groups; 3-propenyloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, etc. Silane coupling agents containing (meth)acrylic acid groups; silane coupling agents containing isocyanate groups such as 3-isocyanatopropyltriethoxysilane.

Furthermore, the adhesive composition forming the adhesive layer B may also contain other well-known additives. For example, it may be appropriately added according to the application: polyether compounds of polyalkylene glycol such as polypropylene glycol, Powders such as colorants and pigments, dyes, surfactants, plasticizers, adhesion imparting agents, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization Inhibitors, inorganic or organic fillers, metal powders, particles, foils, etc. In addition, within a controllable range, a redox system in which a reducing agent is added can also be used.

The adhesive layer B can be formed, for example, by coating the adhesive composition on a transparent protective film of a polarizing film, and drying and removing the polymerization solvent. When applying the aforementioned forming material, one or more solvents other than the polymerization solvent may be newly added as appropriate.

Regarding the coating method of the aforementioned adhesive composition, various methods can be used. Specifically, for example, a roll coating method, a contact sizing roll coating method, a gravure coating method, a reverse roll coating method, a rolling brush method, a spray method, a dip roll coating method, a bar coating method, Methods such as blade coating method, pneumatic blade coating method, curtain coating method, lip nozzle coating method, extrusion coating method by die coater, etc.

The aforementioned heating and drying temperature is preferably 40°C to 200°C, more preferably 50°C to 180°C, particularly preferably 60°C to 170°C. By setting the heating temperature within the above range, an adhesive layer B having excellent adhesive properties can be obtained. Suitable drying time can be used. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.

In addition, the formation of the adhesive layer B can be performed by polymerization by irradiating active energy rays such as ultraviolet rays when the forming material (adhesive agent) is an active energy ray curable adhesive. For ultraviolet radiation, high-pressure mercury lamps, low-pressure mercury lamps, metal halide lamps, etc. can be used.

In addition, the aforementioned adhesive layer B may be transferred to the transparent protective film of the polarizing film after being formed on the support. As for the aforementioned support, those described in this specification can be suitably used.

The adhesive layer B that has been formed on the transparent protective film of the polarizing film can also protect the adhesive surface with a peel-off treated sheet (separator) until it is used. In actual use, the aforementioned peeling-treated sheet is peeled off. As for the separator, those described in this specification can be suitably used.

Although the thickness of the aforementioned adhesive layer B is not particularly limited, it is preferably 30 μm or less, more preferably 1 to 25 μm, still more preferably 5 to 25 μm, and particularly preferably 10 to 20 μm.

2. Optical member The optical member of the present invention is characterized by the polarizing film with the adhesive layer and the brightness enhancing film, which is provided on the adhesive layer A side of the polarizing film with the adhesive layer.

As shown in FIG. 2, in the optical member 10 of the present invention, the brightness enhancement film 6 can be directly attached through the adhesive layer A (3) of the polarizing film 1 with the adhesive layer, or through other layers. Buildup. In addition, the optical member 10 of the present invention is shown in FIG. 3. On the side of the polarizing film 1 without the adhesive layer of the brightness enhancement film 6, the adhesive layer (not shown) and the like can be further laminated on the side 7. The ridge sheet 7 typically has a substrate and a ridge portion.

As for the aforementioned brightness enhancement film 6, a reflective polarizer can be mentioned. The aforementioned reflective polarizing plate is a linearly polarized light separation type polarizing plate. Representative examples include: grid polarizers, multilayer thin-film laminated polarizers made of two or more materials with different refractive indexes, vapor-deposited multilayer films with different refractive indexes, birefringence of two or more materials with different refractive indexes A multi-layer film laminate, a laminate of two or more resins using two or more resins with a difference in refractive index, is stretched, and linearly polarized light is separated by reflection/transmission in the vertical axis direction Polarizing plate (linear polarization separation type reflective polarizing plate). Among these, a linearly polarized light separation type reflective polarizer can be suitably used. For such reflective polarizers, for example, those commercially available under the brand name "D-BEF" manufactured by 3M and the brand name "NIPOCS APCF" manufactured by Nitto Denko Corporation can also be used.

3. Image display device The image display device of the present invention is characterized by including one or more selected from the group consisting of the polarizing film with the adhesive layer and the optical member.

When the aforementioned adhesive layer A is the diffusion adhesive layer A1, the polarizing film with the adhesive layer of the present invention has a light diffusion function, so it can be used, for example, to replace the diffusion sheet provided on the backlight side of an image display device. In addition, at this time, it can be used by forming an optical member together with the brightness enhancement film and the scallop sheet as described above.

In addition, when the adhesive layer A of the polarizing film with an adhesive layer of the present invention does not have a diffusing function (that is, when the adhesive layer A does not contain light diffusing particles), it can also be used as the backlight side of an image display device, Polarizing film for any one of the viewing side.

The image display device of the present invention only needs to include the polarizing film or optical member with the adhesive layer of the present invention, and other configurations may be the same as those of the conventional image display device.

The image display device of the present invention has high reliability because it includes the polarizing film or optical member with the aforementioned adhesive layer. In addition, since the optical member of the present invention has a light diffusing function, the aforementioned optical member can be used in place of the diffusing sheet provided on the backlight side. As a result, the image display device can be thinned, and it is possible to eliminate the interference from the backlight. The deviation of light, and can perform more uniform display. Example

In the following, the present invention will be specifically explained through examples, but the present invention is not limited by these examples. In addition, any of parts and% in each example are based on weight.

Production Example 1 (Production of adhesive composition (A-1)) Styrene-ethylene-propylene-styrene block copolymer (SEPS, trade name: SEPTON 2063, styrene content: 13%, (stock) cola 100 parts by weight of the base polymer, hydrogenated terpene polymer (trade name: Clearon P150, softening point: about 152°C, manufactured by Yasuhara Chemical Co., Ltd.) as a base polymer, 10 parts by weight as an adhesion-imparting resin, mixed to toluene 300 Parts by weight, the adhesive composition (A-1) was prepared.

Production Examples 2 to 8 (Production of Adhesive Compositions (A-2) to (A-8)) Except for the compositions described in Table 1, the adhesive compositions were produced in the same manner as in Production Example 1 ( A-2)~(A-8). In addition, in Production Example 8, the amount of light diffusing fine particles described in Table 1 below was added to 100 parts by weight of the adhesive composition. In addition, the addition amount of the adhesion-imparting resin is an amount relative to 100 parts by weight of the base polymer (rubber-based polymer).

[Table 1]

In Table 1, SEPS is a styrene-ethylene-propylene-styrene block copolymer (trade name: SEPTON 2063, styrene content: 13%, manufactured by Kuraray), and PIB is polyisobutylene (trade name: OPPANOL B80, weight average molecular weight (Mw): about 750,000, made by BASF), BR is butyl rubber (trade name: JSR BUTYL 365, viscosity average molecular weight (Mv): about 350,000, made by JSR (stock)), Clearon Hydrogenated terpene polymer (trade name: Clearon P150, softening point: about 152°C, manufactured by Yasuhara Chemical Co., Ltd.), hydrogenated terpene phenol is trade name: YS POLYSTAR UH115, softening point: about 115°C, Yasuhara Chemical The light diffusing particles are made of silicone resin particles (trade name: Tospearl 145, volume average particle size: 4μm, refractive index: 1.43, silicone resin particles, manufactured by Momentive Performance Materials).

The moisture permeability of Table 1 was measured by the following method. (Method for measuring moisture permeability) The adhesive compositions (A-1) to (A-8) obtained in Production Examples 1 to 8 were used to form an adhesive layer according to the method described in Example 1 below Adhesive sheet with a thickness of 50μm. One of the release liners of the adhesive sheet was peeled off to expose the adhesive surface, and the adhesive sheet was bonded to a cellulose triacetate film (TAC film, thickness 25 μm, manufactured by Konica Minolta (stock)) through the adhesive surface. Then, another release liner was peeled off to obtain a measurement sample. Next, using this measurement sample, the moisture permeability (water vapor transmission rate) was measured by the moisture permeability test method (cup method (cup method) according to JIS Z 0208) under the following conditions. Measurement temperature: 40°C Relative humidity: 92% Measurement time: 24 hours In addition, a constant temperature and humidity bath was used for the measurement.

Production Example 9 (Production of Polarizing Film) In order to produce a thin polarizing film, first, a laminate with a 9μm thick polyvinyl alcohol (PVA) layer was formed on an amorphous polyethylene terephthalate (PET) substrate. The stretched laminate was produced by air-assisted stretch at a stretch temperature of 130°C. Next, the stretched laminate was dyed to produce a colored laminate, and the colored laminate was stretched in boric acid water at a stretching temperature of 65°C to produce an optical thin film laminate including a 4μm thick PVA layer. The 4μm thick The PVA layer is stretched integrally with the amorphous PET substrate so that the total stretch ratio becomes 5.94 times. By such two-stage stretching, an optical film laminate including a PVA layer with a thickness of 5 μm that constitutes a high-performance polarizing film (polarizer) is formed. The high-performance polarizing film (polarizer) is formed on an amorphous PET substrate. The PVA molecules of the PVA layer are highly aligned, and the iodine adsorbed by dyeing is highly aligned in one direction as a polyiodide ion complex.

The surface of the polarizing film (polarizer, thickness: 5μm) of the above-mentioned optical film laminate related to the above-mentioned polarizer is transparently protected while being coated with a polyvinyl alcohol-based adhesive so that the thickness of the adhesive layer becomes 0.1μm After the film (thickness 20 μm (meth)acrylic resin film having a lactone ring structure has been corona treated), it was dried at 50°C for 5 minutes. Next, the amorphous PET substrate was peeled off, and a single-sided protective polarizing film using a thin polarizer was produced.

Production example 10 (production of adhesive layer (B-1)) 99 parts by weight of butyl acrylate (BA) and 1 part by weight of 4-hydroxybutyl acrylate (4HBA) were used as monomer components, and azobisisobutyronitrile 0.2 parts by weight as a polymerization initiator and ethyl acetate as a polymerization solvent were put into a separable flask equipped with a thermometer, a stirrer, a reflux cooling tube, and a nitrogen inlet tube so that the solid content became 20%, and then nitrogen was flowed while Nitrogen substitution was performed for about 1 hour while stirring. Thereafter, the flask was heated to 60°C and reacted for 7 hours to obtain an acrylic polymer with a weight average molecular weight (Mw) of 1.1 million. 0.8 parts by weight of trimethylolpropane toluene diisocyanate (trade name: Coronaate L, manufactured by Japan Polyurethane Industry Co., Ltd.) was used as an isocyanate-based crosslinking agent and a silane coupling agent (trade name: KBM-403, 0.1 parts by weight of Shin-Etsu Chemical Co., Ltd.) was added to the acrylic polymer solution (100 parts by weight of solid content) to prepare an adhesive composition (B-1). The adhesive composition (B-1) prepared above was applied to a polyethylene terephthalate release liner having a thickness of 38 μm so that the thickness after drying became 5 μm, 10 μm, and 20 μm , Under normal pressure, heating and drying at 60°C for 1 minute and 150°C for 1 minute to produce adhesive layers (B-1) having various thicknesses (5 μm, 10 μm, and 20 μm). The moisture permeability of the adhesive layer B is 1400 g/(m ² · 24h). In addition, the measurement of the moisture permeability was measured by the same method as the adhesive layer A.

Example 1 A polyester film with a thickness of 38 μm (trade name: DIAHOIL MRF, manufactured by Mitsubishi Resin Co., Ltd.) was peeled off on one side with silicone to make the final thickness of 5 μm. The adhesive composition (A-1) obtained in Manufacturing Example 1 was applied by the method to form a coating layer. Next, the coating layer was dried at 130°C for 2 minutes to form an adhesive layer (A-1), and an adhesive sheet was produced. In addition, for the adhesive surface of the adhesive sheet, a 38μm thick polyester film (trade name: DIAHOIL MRF, manufactured by Mitsubishi Plastics Co., Ltd.) that has been peeled off on one side with silicone is used to make The peeling treatment surface is bonded with the aforementioned adhesive layer. The polyester film coated on both sides of the adhesive layer functions as a release liner (separator).

One of the release liners of the aforementioned adhesive sheet was peeled off and laminated to a brightness enhancement film (trade name: D-BEF, manufactured by 3M) to form a brightness enhancement film with adhesive layer A (adhesive layer (A- 1)/brightening film).

Transfer the adhesive layer (B-1) with a thickness of 20 μm obtained in Production Example 10 to one side (transparent protective film) of the single-sided protective polarizing film (Size: 150 mm in length × 70 mm in width) obtained in Production Example 9 Side), a polarizing film with adhesive layer B (release liner/adhesive layer (B-1)/transparent protective film/polarizer) was obtained.

Peel off the release liner of the adhesive layer A of the brightness enhancement film of the adhesive layer A, and laminate the adhesive layer A on the polarizer of the polarizing film of the adhesive layer B in such a way that the adhesive layer A is in contact with the polarizer.了optical components. The release liner of the adhesive layer B remains as a separator. The composition of the obtained optical member was release liner (separator)/adhesive layer (B-1)/transparent protective film/polarizer/adhesive layer (A-1)/brightness enhancement film.

Examples 2 to 23, Comparative Examples 1 to 5 In Example 1, the optical member was formed in the same manner as in Example 1, except that the type and thickness of the adhesive layer A were changed as shown in Table 2. In Comparative Examples 1 to 3, the adhesive layer (B-1) of each thickness obtained in Manufacturing Example 10 was used as the adhesive layer A. In addition, the haze value of the light diffusion adhesive layer of Examples 22 and 23 was measured by the following method.

<Haze value> For the haze value of the light diffusion adhesive layer used in Examples 22 and 23, a haze meter (product name: HN-150, ( (Stock) made by Murakami Color Science Research Institute) to carry out the measurement.

Example 24 One of the release liners of the adhesive sheet of the adhesive layer (A-1) obtained in Example 1 was peeled off, and the adhesive layer (A-1) was transferred to the sheet obtained in Manufacturing Example 9. One side (polarizer side) of the surface-protected polarizing film (size: 150mm x 70mm), polarizing film with adhesive layer (transparent protective film/polarizer/adhesive layer (A-1)/release liner) Pad (separator)).

Examples 25 to 28 In Example 24, except that the type of adhesive layer A was changed as shown in Table 2, a polarizing film with an adhesive layer was formed in the same manner as in Example 24.

Comparative Example 6 The adhesive layer (B-1) with a thickness of 5 μm obtained in Production Example 10 was transferred to one side of the single-sided protective polarizing film (size: 150 mm in length × 70 mm in width) obtained in Production Example 9 (Polarizer side), a polarizing film with adhesive layer B (release liner (separator)/adhesive layer (B-1)/polarizer/transparent protective film) was obtained.

Comparative Example 7 The adhesive layer (B-1) with a thickness of 20 μm obtained in Production Example 10 was transferred to one side of the single-sided protective polarizing film (size: 150 mm in length × 70 mm in width) obtained in Production Example 9 (Polarizer side), a polarizing film with adhesive layer B (release liner (separator)/adhesive layer (B-1)/polarizer/transparent protective film) was obtained.

For the optical members (measurement sample: with separator (release liner)) obtained in the above Examples 1 to 23 and Comparative Examples 1 to 5, the adhesion obtained in Examples 24 to 28 and Comparative Examples 6 and 7 The polarizing film of the agent layer (measurement sample: with separator (release liner)) was evaluated as follows. The evaluation results are shown in Table 2.

<Corner decolorization> Two test pieces (50mm×50mm) each perpendicular to the extending direction and the extending direction were made to face each other and cut out from the polarizing film with the adhesive layer obtained in the Examples and Comparative Examples. For the optical components of Examples 1 to 23 and Comparative Examples 1 to 5, the separator on the adhesive layer B was peeled off, the test piece was attached to the glass plate, and it was placed in an oven at 60°C and 90% humidity Humidification was performed for 300 hours, and the decolorization state of the corners of the humidified polarizing film when the standard polarizing plate and the crossed Nicols were arranged was investigated by microscope. For the polarizing films with adhesive layers of Examples 24 to 28 and Comparative Examples 6 and 7, the separator on the adhesive layer A was peeled off, the test piece was attached to the glass plate, and the same as the above-mentioned investigation by microscope The discoloration of the corners. Specifically, the size of the discoloration from the end of the polarizing film (amount of discoloration: μm) was measured. MX61L manufactured by Olympus was used as a microscope, and the amount of decolorization was measured from an image taken at a magnification of 10 times. When measuring for a plurality of parts, let the largest one be the amount of decolorization. In addition, the decolorized area has significantly low polarization characteristics and does not substantially function as a polarizing plate. Therefore, the amount of decolorization is preferably 200 μm or less, more preferably 100 μm, and still more preferably 50 μm or less.

<Durability> Visually or using a magnifying glass (20 times) to observe the optical member or the polarizing film with the adhesive layer obtained in the Examples and Comparative Examples, and put it in an environment of 80℃, 60℃/90%RH for 300 hours status. The evaluation was performed based on the following evaluation criteria. ◎: Even if confirmed with a magnifying glass, no defects (foaming, peeling, etc.) occurred. ○: The defect cannot be confirmed visually, but if it is confirmed with a magnifying glass, there will be some defects that are not problematic for use. ×: Defects can be confirmed visually.

[Table 2]

In Table 2, (A-1)~(A-8) are the adhesive compositions (A-1)~(A-8) obtained in Manufacturing Examples 1-8, and (B-1) is shown in Manufacturing In the adhesive composition (B-1) obtained in Example 10, D-BEF represents a brightening film (trade name: D-BEF, manufactured by 3M).

The content (%) of light diffusing fine particles in Table 2 is the content of light diffusing fine particles in the light diffusing adhesive layer.

1‧‧‧Polarizing film with adhesive layer 2‧‧‧Polarizing film 3‧‧‧Adhesive layer A (or light diffusion adhesive layer A1) 4‧‧‧Polarizer 5‧‧‧Transparent protective film 6‧‧ ‧Brightness enhancement film 7‧‧‧Film sheet 10‧‧‧Optical component

Fig. 1 is a cross-sectional view schematically showing an embodiment of the polarizing film with an adhesive layer of the present invention. Fig. 2 is a cross-sectional view schematically showing an embodiment of the optical member of the present invention. Fig. 3 is a cross-sectional view schematically showing an embodiment of the optical member of the present invention.

1‧‧‧Polarizing film with adhesive layer

2‧‧‧Polarizing film

3‧‧‧Adhesive layer A (or light diffusion adhesive layer A1)

4‧‧‧Polarizer

5‧‧‧Transparent protective film

Claims (11)

A polarizing film with an adhesive layer, which has a polarizing film and an adhesive layer A provided on the polarizing film. The polarizing film with the adhesive layer is characterized in that: the polarizing film is only a polarizer with a thickness of less than 10 μm A single-sided protective polarizing film with a transparent protective film on one side, the adhesive layer A is provided on the side of the polarizer that does not have the transparent protective film; and the moisture permeability of the adhesive layer A is 100g/(m ² ‧24h) Below, and the thickness is 30 μm or less. The polarizing film with an adhesive layer of claim 1, wherein the adhesive layer A is an adhesive layer containing a rubber-based polymer as a main component. The polarizing film with an adhesive layer of claim 2, wherein the rubber-based polymer is one or more rubber-based polymers selected from the group consisting of styrene-based thermoplastic elastomers, polyisobutylene, and butyl rubber . The polarizing film with an adhesive layer according to claim 2 or 3, wherein the adhesive layer A further includes an adhesion imparting resin. The polarizing film with an adhesive layer of claim 1, wherein the adhesive layer A is a light-diffusing adhesive layer A1 containing light diffusing fine particles. For example, the polarizing film with adhesive layer of claim 5, wherein the haze of the light-diffusing adhesive layer A1 is 10-95%. Such as the polarizing film with adhesive layer of claim 5, which Among them, the light diffusing particles are silicone resin particles or styrene resin particles. The polarizing film with an adhesive layer according to any one of claims 5 to 7, wherein the volume average particle diameter of the light diffusing fine particles is 1 to 4 μm. An optical component characterized by having a polarizing film with an adhesive layer and a brightness enhancing film as claimed in any one of claims 1 to 8, the brightness enhancing film being provided on the adhesive layer of the polarizing film with the adhesive layer side. The optical member of claim 9, wherein the brightening film is further provided with a scallop sheet on the side of the polarizing film without an adhesive layer. An image display device characterized by comprising at least one selected from the group consisting of polarizing films with adhesive layers as claimed in claims 1 to 8 and optical members as claimed in claims 9 and 10.

Images