WO2017033741A1 - 光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置 - Google Patents

光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置 Download PDF

Info

Publication number
WO2017033741A1
WO2017033741A1 PCT/JP2016/073457 JP2016073457W WO2017033741A1 WO 2017033741 A1 WO2017033741 A1 WO 2017033741A1 JP 2016073457 W JP2016073457 W JP 2016073457W WO 2017033741 A1 WO2017033741 A1 WO 2017033741A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive layer
sensitive adhesive
pressure
meth
optical member
Prior art date
Application number
PCT/JP2016/073457
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
淳 保井
翔 寳田
良平 澤▲崎▼
山本　真也
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020177036994A priority Critical patent/KR102543355B1/ko
Priority to CN201680047018.4A priority patent/CN107922807B/zh
Publication of WO2017033741A1 publication Critical patent/WO2017033741A1/ja

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to a pressure-sensitive adhesive layer for optical members having a light diffusion function, and an optical member with a pressure-sensitive adhesive layer having at least one pressure-sensitive adhesive layer for optical members on at least one surface of the optical member. Moreover, this invention relates to the image display apparatus containing the said optical member with an adhesive layer.
  • the backlight unit of the image display device generally includes a diffusion sheet in order to improve the visibility, but the diffusion sheet alone may not ensure sufficient visibility, In some cases, an adhesive layer having a light diffusion function is used.
  • Examples of such a light diffusing pressure-sensitive adhesive include a pressure-sensitive adhesive containing a base polymer containing a (meth) acrylic polymer, and light diffusing fine particles having a refractive index lower than that of the pressure-sensitive adhesive.
  • a light diffusion pressure-sensitive adhesive in which an acrylic polymer contains an aromatic ring-containing (meth) acrylic monomer as a monomer unit is disclosed (for example, see Patent Document 1).
  • the pressure-sensitive adhesive layer of Patent Document 1 has a light diffusing function, wrinkles and sagging may occur when various types of optical members having a large size or a thin film are bonded.
  • a step absorbability is required when bonding an optical member having a step (unevenness) on the surface, such as a prism sheet.
  • a step absorbability is required when bonding an optical member having a step (unevenness) on the surface, such as a prism sheet.
  • a step absorbability is required.
  • in terms of the step absorbability was not enough.
  • this invention aims at providing the adhesive layer for optical members which can bond the optical member which has various optical members thinned and thinned, and the optical member which has a level
  • this invention provides the image display apparatus containing the optical member with an adhesive layer which has at least 1 layer of the said adhesive layer for optical members on the at least one surface of an optical member, and the said optical member with an adhesive layer. Also aimed.
  • the present invention includes at least one light-diffusing pressure-sensitive adhesive layer formed from a base pressure-sensitive adhesive composition containing a (meth) acrylic polymer and a light-diffusing fine particle and having a thickness of 5 to 300 ⁇ m, The thickness of the entire pressure-sensitive adhesive layer is 20 ⁇ m or more,
  • the present invention relates to a pressure-sensitive adhesive layer for optical members, characterized by having a haze of 10 to 96%.
  • the light diffusing fine particles are preferably silicone resin fine particles.
  • the refractive index of the light diffusing fine particles is preferably lower than the refractive index of the base pressure-sensitive adhesive composition.
  • the volume average particle diameter of the light diffusing fine particles is preferably 1 to 5 ⁇ m.
  • the pressure-sensitive adhesive layer of the present invention can be formed by laminating a transparent pressure-sensitive adhesive layer having a haze of 0.01 to 5% on at least one surface of the light-diffusing pressure-sensitive adhesive layer.
  • the thickness of the transparent adhesive layer having a haze of 0.01 to 5% is preferably 50 to 300 ⁇ m.
  • the content of the light diffusing fine particles in the light diffusing pressure-sensitive adhesive layer is preferably 3 to 30% by weight.
  • the (meth) acrylic polymer preferably contains an alkyl (meth) acrylate and a carboxyl group-containing monomer as monomer components.
  • the transparent adhesive layer preferably contains a (meth) acrylic polymer containing an alkyl (meth) acrylate, a hydroxyl group-containing monomer, and a nitrogen-containing monomer as monomer components.
  • the (meth) acrylic polymer contained in the transparent adhesive layer does not contain a carboxyl group-containing monomer as a monomer component.
  • the present invention also relates to an optical member with an adhesive layer, characterized in that the optical member has at least one adhesive layer for an optical member on at least one surface of the optical member. Furthermore, this invention relates to the image display apparatus characterized by including the said optical member with an adhesive layer.
  • the pressure-sensitive adhesive layer for optical members of the present invention has a light diffusion pressure-sensitive adhesive layer having a specific thickness and has a specific thickness as the whole pressure-sensitive adhesive layer, various types of optical devices that have been made larger and thinner.
  • the members can be laminated without wrinkles or sagging.
  • the pressure-sensitive adhesive layer for optical members of the present invention has a specific thickness, for example, when a member having a step on the surface thereof, such as a prism sheet, is bonded, there is no gap following the step. Bonding can be performed.
  • the adhesive layer for optical members of this invention has a specific haze, it is excellent also in the display nonuniformity and durability requested
  • Such an optical member with an adhesive layer using the adhesive layer for an optical member of the present invention and an image display device including the optical member with an adhesive layer have high reliability.
  • the pressure-sensitive adhesive layer for an optical member of the present invention is formed of a base pressure-sensitive adhesive composition containing a (meth) acrylic polymer and light-diffusing fine particles, and has at least one light-diffusing pressure-sensitive adhesive layer having a thickness of 5 to 300 ⁇ m. Including The pressure-sensitive adhesive layer as a whole has a thickness of 20 ⁇ m or more and a haze of 10 to 96%.
  • the configuration of the pressure-sensitive adhesive layer for optical members of the present invention is not particularly limited, and it may have at least one light diffusion pressure-sensitive adhesive layer having a thickness of 5 to 300 ⁇ m, and the total thickness of the pressure-sensitive adhesive layer may be 20 ⁇ m or more. It is good. Although it does not specifically limit about a specific structure, For example, the following structures can be mentioned.
  • the thickness of the light diffusion pressure-sensitive adhesive layer is less than 20 ⁇ m, a transparent pressure-sensitive adhesive layer other than the light diffusion pressure-sensitive adhesive layer is bonded together with the light diffusion pressure-sensitive adhesive layer so that the total thickness becomes 20 ⁇ m or more.
  • the pressure-sensitive adhesive layer for optical members of the present invention can be formed.
  • the light diffusion pressure-sensitive adhesive layer or the other transparent pressure-sensitive adhesive layer may be one layer or two or more layers, for example, as shown in FIG.
  • the pressure-sensitive adhesive layer 1 for an optical member can be formed from the layer 2 and the transparent pressure-sensitive adhesive layer 3.
  • the transparent adhesive layer 3 can also be formed on both surfaces of the light-diffusion adhesive layer 2, and the light-diffusion adhesive layer 2 is shown in FIG.1 (c). And the transparent pressure-sensitive adhesive layer 3 can be alternately laminated. Further, when the thickness of the light diffusing pressure-sensitive adhesive layer is 20 ⁇ m or more, the same configuration as that shown in FIGS. 1 (a) to (c) can be obtained, but as shown in FIG. Only one diffusion adhesive layer 2 can be used as the optical member adhesive layer 1 of the present invention. 1A to 1D show a form in which the separator 4 is bonded to both surfaces of the optical member pressure-sensitive adhesive layer 1.
  • the thickness of the pressure-sensitive adhesive layer for optical members of the present invention is 20 ⁇ m or more, preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more, and more preferably 100 ⁇ m or more. More preferably, it is more preferable to exceed 100 ⁇ m.
  • the upper limit of the thickness of the entire pressure-sensitive adhesive layer is not particularly limited, but is preferably about 300 ⁇ m or less, more preferably about 200 ⁇ m or less.
  • the light diffusion pressure-sensitive adhesive layer included in the pressure-sensitive adhesive layer for optical members of the present invention is formed from a base pressure-sensitive adhesive composition containing a (meth) acrylic polymer and light diffusing fine particles, The thickness is 5 to 300 ⁇ m.
  • the base pressure-sensitive adhesive composition used in the present invention contains a (meth) acrylic polymer (A) as a base polymer.
  • the (meth) acrylic polymer (A) contains an alkyl (meth) acrylate (a1) constituting the main skeleton of the (meth) acrylic polymer (A) as a monomer unit.
  • (Meth) acrylate refers to acrylate and / or methacrylate.
  • alkyl (meth) acrylate (a1) examples include those having a linear or branched alkyl group having 1 to 18 carbon atoms.
  • the alkyl group includes methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, amyl group, hexyl group, cyclohexyl group, heptyl group, 2-ethylhexyl group, isooctyl group, nonyl group, decyl group.
  • isodecyl group isodecyl group, dodecyl group, isomyristyl group, lauryl group, tridecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group and the like. These can be used alone or in combination.
  • the blending ratio of the alkyl (meth) acrylate (a1) is preferably 50% by weight or more with respect to all constituent monomers (100% by weight) constituting the (meth) acrylic polymer (A), It is more preferably 100% by weight, further preferably 60 to 100% by weight, and particularly preferably 70 to 90% by weight.
  • the (meth) acrylic polymer (A) is selected from the group consisting of a carboxyl group-containing monomer (a2), a hydroxyl group-containing monomer (a3), and a nitrogen-containing monomer (a4) for the purpose of improving adhesiveness and heat resistance. It is preferable to include one or more selected monomers as monomer components.
  • the carboxyl group-containing monomer (a2) a monomer having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group and having a carboxyl group can be used without particular limitation.
  • the carboxyl group-containing monomer include (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid. Can be used alone or in combination. These anhydrides can be used for itaconic acid and maleic acid. Among these, acrylic acid and methacrylic acid are preferable, and acrylic acid is particularly preferable.
  • the blending ratio of the carboxyl group-containing monomer (a2) is preferably 10% by weight or less with respect to all constituent monomers (100% by weight) constituting the (meth) acrylic polymer (A), 0.05 It is more preferably from 10 to 10% by weight, further preferably from 0.1 to 10% by weight, particularly preferably from 0.5 to 5% by weight.
  • hydroxyl group-containing monomer (a3) a monomer having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group and having a hydroxyl group can be used without particular limitation. .
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl ( (4-hydroxymethylcyclohexyl) methyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, hydroxyalkyl (meth) acrylate such as 12-hydroxylauryl (meth) acrylate; And hydroxyalkylcycloalkane (meth) acrylates such as (meth) acrylate.
  • hydroxyethyl (meth) acrylamide examples include hydroxyethyl (meth) acrylamide, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like. These can be used alone or in combination. Among these, hydroxyalkyl (meth) acrylate is preferable, and 2-hydroxyethyl (meth) acrylate is more preferable.
  • the blending ratio of the hydroxyl group-containing monomer (a3) is preferably 20% by weight or less with respect to all the constituent monomers (100% by weight) constituting the (meth) acrylic polymer (A). More preferably, it is ⁇ 20% by weight, more preferably 0.1 to 15% by weight, and particularly preferably 1 to 15% by weight.
  • the nitrogen-containing monomer (a4) a monomer having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group and a functional group having a nitrogen atom is used without particular limitation. be able to.
  • the nitrogen-containing monomer (a4) include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, and N-butyl (meth).
  • (Meth) acrylamide monomers such as acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, (meth) acryloylmorpholine; for example, aminoethyl (meth) acrylate, (meth) acrylic acid N, N-dimethylaminoethyl, amino group-containing monomer having primary, secondary or tertiary at the terminal, such as t-butylaminoethyl (meth) acrylate; for example, cyano group-containing monomer such as acrylonitrile, methacrylonitrile; N -Vinylpyrrolidone, N- (1-methyl Nyl) pyrrolidone and other pyrrolidone monomers, N-vinylpyridine, N-vinylpiperidone, N-vinylpyrimidine, N-vinylpiperazine, N-vinylpyrazine, N-vinylpyrrole,
  • the blending ratio of the nitrogen-containing monomer (a4) is preferably 20% by weight or less with respect to all the constituent monomers (100% by weight) constituting the (meth) acrylic polymer (A), and is 0.05 to It is more preferably 20% by weight, further preferably 0.1 to 15% by weight, and particularly preferably 1 to 15% by weight.
  • the (meth) acrylic polymer (A) In addition to the alkyl (meth) acrylate (a1), the carboxyl group-containing monomer (a2), the hydroxyl group-containing monomer (a3), and the nitrogen-containing monomer (a4), the (meth) acrylic polymer (A) In order to improve adhesiveness and heat resistance, one or more copolymerization monomers having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group are introduced by copolymerization. be able to.
  • copolymerization monomers include, for example, caprolactone adducts of acrylic acid; sulfonic acid groups containing styrene sulfonic acid, allyl sulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalene sulfonic acid, etc.
  • Monomers Phosphoric acid group-containing monomers such as 2-hydroxyethylacryloyl phosphate.
  • vinyl monomers such as vinyl acetate and vinyl propionate; epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, ( Glycol acrylic ester monomers such as methacrylic acid methoxyethylene glycol and (meth) acrylic acid methoxypolypropylene glycol; (meth) acrylic acid tetrahydrofurfuryl, fluorine (meth) acrylate, silicone (meth) acrylate and 2-methoxyethyl acrylate Acrylic ester monomers such as can also be used. Furthermore, isoprene, butadiene, isobutylene, vinyl ether and the like can be mentioned.
  • examples of copolymerizable monomers other than the above include silane-based monomers containing silicon atoms.
  • examples of the silane monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8-vinyloctyltrimethoxysilane.
  • a polyfunctional monomer can be used as a copolymerization monomer as necessary in order to adjust the cohesive strength of the pressure-sensitive adhesive.
  • the monofunctional monomer means a monomer having one polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group, and is a polyfunctional monomer. As described later, indicates a monomer having at least two polymerizable functional groups having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group.
  • the polyfunctional monomer is a monomer having at least two polymerizable functional groups having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group, such as (poly) ethylene glycol di (meth) acrylate, (Poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,2-ethylene Glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,12-dodecanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylol methanetri (meth) acrylate Ester compounds of poly
  • the proportion of the copolymerization monomer other than the carboxyl group-containing monomer (a2), the hydroxyl group-containing monomer (a3), and the nitrogen-containing monomer (a4) is not particularly limited, but may be all of the (meth) acrylic polymer (A).
  • the monomer it is preferably 10% by weight or less, more preferably 0.1 to 10% by weight, and further preferably 0.1 to 5% by weight.
  • the (meth) acrylic polymer (A) can be obtained by polymerizing the above monomers appropriately in accordance with the purpose and desired properties.
  • the obtained (meth) acrylic polymer (A) may be any of a random copolymer, a block copolymer, and a graft copolymer.
  • the (meth) acrylic polymer (A) can be synthesized by any appropriate method. For example, it can be synthesized by referring to “Chemistry and Application of Adhesion / Adhesion” by Katsuhiko Nakamae, published by Dainippon Tosho Co., Ltd. .
  • any appropriate method can be adopted as a polymerization method of the (meth) acrylic polymer (A).
  • Specific examples include solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations.
  • the polymerization initiator, chain transfer agent, emulsifier and the like used for radical polymerization are not particularly limited and can be appropriately selected and used.
  • the weight average molecular weight of a (meth) acrylic-type polymer can be controlled by the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, The usage-amount is suitably adjusted according to these kinds.
  • solution polymerization for example, ethyl acetate, toluene or the like is used as a polymerization solvent.
  • the reaction is carried out in an inert gas stream such as nitrogen and a polymerization initiator is added, and the reaction is usually performed at about 50 to 70 ° C. under reaction conditions for about 5 to 30 hours.
  • thermal polymerization initiators used for solution polymerization include 2,2′-azobisisobutyronitrile, 2,2′-azobis-2-methylbutyronitrile, 2,2′-azobis (2 -Methylpropionic acid) dimethyl, 4,4'-azobis-4-cyanovaleric acid, azobisisovaleronitrile, 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′-dimethyleneisobutyl) Amidine), 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate (VA-057, Wako Pure Chemical Industries, Ltd.) Azo initiators such as potassium persulfate, ammonium persulfate,
  • Examples include oxide initiators, redox initiators that combine a peroxide and a reducing agent, such as a combination of persulfate and sodium bisulfite, and a combination of peroxide and sodium ascorbate. It is not limited to.
  • the said polymerization initiator may be used independently and may be used in mixture of 2 or more types, with respect to 100 weight part of all the monomer components which comprise a (meth) acrylic-type polymer (A).
  • the amount is preferably about 1 part by weight or less, more preferably about 0.005 to 1 part by weight, and still more preferably about 0.02 to 0.5 part by weight.
  • the amount of polymerization initiator used is the total amount of monomer components.
  • the amount is preferably about 0.2 parts by weight or less with respect to 100 parts by weight, and more preferably about 0.06 to 0.2 parts by weight.
  • chain transfer agent examples include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2,3-dimercapto-1-propanol.
  • the chain transfer agent may be used alone or in combination of two or more, but the total content is 0.1 parts by weight with respect to 100 parts by weight of the total amount of monomer components. Less than or equal to
  • emulsifier used in emulsion polymerization examples include anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, ammonium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkylphenyl ether sulfate, and polyoxy Nonionic emulsifiers such as ethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene-polyoxypropylene block polymer and the like can be mentioned. These emulsifiers may be used alone or in combination of two or more.
  • a reactive emulsifier into which a radical polymerizable functional group such as a propenyl group or an allyl ether group is introduced can be used.
  • a reactive emulsifier into which a radical polymerizable functional group such as a propenyl group or an allyl ether group is introduced can be used.
  • Aqualon HS-10, HS-20, KH-10, BC-05, BC-10, BC-20 (all of which are manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Adekaria soap SE10N (Made by ADEKA).
  • the amount of the emulsifier used is preferably 5 parts by weight or less, more preferably 0.3 to 5 parts by weight, based on 100 parts by weight of the total amount of the monomer components, and it has polymerization stability and mechanical stability. From the viewpoint, it is more preferably 0.5 to 1 part by weight.
  • the (meth) acrylic polymer (A) when produced by radiation polymerization, it can be produced by polymerizing the monomer component by irradiating with radiation such as electron beam or UV.
  • radiation polymerization When the radiation polymerization is performed with an electron beam, it is not particularly necessary to include a photopolymerization initiator in the monomer component.
  • the radiation polymerization is performed with UV polymerization, the polymerization time is particularly short.
  • a photopolymerization initiator can be contained in the monomer component because of the advantages that can be achieved.
  • a photoinitiator can be used individually by 1 type or in combination of 2 or more types.
  • the photopolymerization initiator is not particularly limited, but is not particularly limited as long as it initiates photopolymerization, and a commonly used photopolymerization initiator can be used.
  • a commonly used photopolymerization initiator can be used.
  • benzoin ether photopolymerization initiator acetophenone photopolymerization initiator, ⁇ -ketol photopolymerization initiator, aromatic sulfonyl chloride photopolymerization initiator, photoactive oxime photopolymerization initiator, benzoin photopolymerization initiator Agents, benzyl photopolymerization initiators, benzophenone photopolymerization initiators, ketal photopolymerization initiators, thioxanthone photopolymerization initiators, acylphosphine oxide photopolymerization initiators, and the like can be used.
  • examples of the benzoin ether photopolymerization initiator include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane- Examples thereof include 1-one (trade name: Irgacure 651, manufactured by BASF), anisole methyl ether, and the like.
  • acetophenone photopolymerization initiator examples include 1-hydroxycyclohexyl phenyl ketone (trade name: Irgacure 184, manufactured by BASF), 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 1- [4- ( 2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (trade name: Irgacure 2959, manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl-propane- Examples thereof include 1-one (trade name: Darocur 1173, manufactured by BASF), methoxyacetophenone, and the like.
  • Examples of the ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1- [4- (2-hydroxyethyl) -phenyl] -2-hydroxy-2-methylpropane-1- ON etc. are mentioned.
  • Examples of aromatic sulfonyl chloride photopolymerization initiators include 2-naphthalenesulfonyl chloride.
  • Examples of the photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime.
  • the benzoin photopolymerization initiator includes, for example, benzoin.
  • Examples of the benzyl photopolymerization initiator include benzyl.
  • Examples of the benzophenone photopolymerization initiator include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexyl phenyl ketone, and the like.
  • Examples of the ketal photopolymerization initiator include benzyl dimethyl ketal.
  • thioxanthone photopolymerization initiator examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone and the like are included.
  • acylphosphine photopolymerization initiator examples include bis (2,6-dimethoxybenzoyl) phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) (2,4,4-trimethylpentyl) phosphine oxide, bis ( 2,6-dimethoxybenzoyl) -n-butylphosphine oxide, bis (2,6-dimethoxybenzoyl)-(2-methylpropan-1-yl) phosphine oxide, bis (2,6-dimethoxybenzoyl)-(1- Methylpropan-1-yl) phosphine oxide, bis (2,6-dimethoxybenzoyl) -t-butylphosphine oxide, bis (2,6-dimethoxybenzoyl) cyclohexylphosphine oxide, bis (2,6-dimethoxybenzoyl) octylphosphine Oxides, bis (2- T
  • the amount of the photopolymerization initiator used is not particularly limited, but is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the total monomers constituting the (meth) acrylic polymer (A), for example, 0.05 Is more preferably 3 to 3 parts by weight, still more preferably 0.05 to 1.5 parts by weight, and particularly preferably 0.1 to 1 part by weight. If the usage-amount of a photoinitiator is in the said range, a polymerization reaction can fully be advanced. In addition, a photopolymerization initiator can be used individually by 1 type or in combination of 2 or more types.
  • the weight average molecular weight of the (meth) acrylic polymer (A) used in the present invention is preferably 400,000 to 2,500,000, and more preferably 600,000 to 2,200,000. By making the weight average molecular weight larger than 400,000, it is possible to satisfy the durability of the pressure-sensitive adhesive layer, or to suppress the occurrence of adhesive residue due to the reduced cohesive force of the pressure-sensitive adhesive layer.
  • the weight average molecular weight is a value measured by gel permeation chromatography (GPC) and calculated in terms of polystyrene. In addition, it is difficult to measure the molecular weight of the (meth) acrylic polymer obtained by radiation polymerization.
  • the base pressure-sensitive adhesive composition used in the present invention may contain a crosslinking agent.
  • the crosslinking agent include organic crosslinking agents and polyfunctional metal chelates.
  • the organic crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, an epoxy crosslinking agent, and an imine crosslinking agent.
  • a polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinately bonded to an organic compound.
  • the polyvalent metal include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, and Ti. Can be mentioned.
  • organic compound examples include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, and ketone compounds.
  • an oxygen atom is mentioned, for example.
  • a crosslinking agent an isocyanate type crosslinking agent is preferable.
  • An isocyanate-based crosslinking agent typically refers to a compound having two or more isocyanate groups in one molecule.
  • isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and isocyanate compounds obtained by adding these isocyanate monomers to trimethylolpropane, etc.
  • Examples include isocyanurates, burette type compounds, and urethane prepolymer type isocyanates obtained by addition reaction with polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, and the like.
  • a polyisocyanate compound which is one or a polyisocyanate compound derived from one selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate.
  • hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, polyol modified with one or more polyisocyanate compounds selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate examples include hexamethylene diisocyanate, polyol-modified hydrogenated xylylene diisocyanate, trimer-type hydrogenated xylylene diisocyanate, and polyol-modified isophorone diisocyanate.
  • the epoxy-based crosslinking agent typically refers to a compound having two or more epoxy groups (glycidyl groups) in one molecule.
  • examples of the epoxy-based crosslinking agent include ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, diglycidyl terephthalate, spiroglycol diglycidyl ether, diglycidylaminomethylcyclohexane, tetraglycidylxylenediamine, and polyglycidylmetaxylene. Examples include diamines.
  • any suitable compound capable of generating radical active species by heating or light irradiation to advance the crosslinking of the base polymer can be employed.
  • a peroxide having a 1 minute half-life temperature of 80 ° C. to 160 ° C. is preferable, and a peroxide having a 90 ° C. to 140 ° C. is more preferable.
  • peroxides include di (2-ethylhexyl) peroxydicarbonate (1 minute half-life temperature: 90.6 ° C.), di (4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life) Temperature: 92.1 ° C.), di-sec-butyl peroxydicarbonate (1 minute half-life temperature: 92.4 ° C.), t-butyl peroxyneodecanoate (1 minute half-life temperature: 103.5 ° C.) ), T-hexyl peroxypivalate (1 minute half-life temperature: 109.1 ° C.), t-butyl peroxypivalate (1 minute half-life temperature: 110.3 ° C.), dilauroyl peroxide (half minute for 1 minute) Phase temperature: 116.4 ° C.), di-n-octanoyl peroxide (1 minute half-life temperature: 117.4 ° C.), 1,1,3,3-tetramethylbutyl
  • the peroxide half-life is an index representing the decomposition rate of the peroxide, and means the time until the remaining amount of peroxide is reduced to half. Therefore, the 1-minute half-life temperature of peroxide refers to the temperature at which the remaining amount of peroxide is halved in 1 minute.
  • the decomposition temperature for obtaining a half-life at an arbitrary time and the half-life time at an arbitrary temperature are described in the manufacturer catalog, for example, “Organic Peroxide Catalog No. 9 of Nippon Oil & Fats Co., Ltd.” Edition ( May 2003) ".
  • the amount of the crosslinking agent used is preferably 0.01 to 20 parts by weight and more preferably 0.03 to 10 parts by weight with respect to 100 parts by weight of the (meth) acrylic polymer (A).
  • the amount of the crosslinking agent used is less than 0.01 parts by weight, the cohesive force of the pressure-sensitive adhesive tends to be insufficient, and foaming may occur during heating.
  • the amount of the crosslinking agent used exceeds 20 parts by weight, the moisture resistance is not sufficient, and peeling or the like may easily occur.
  • the base pressure-sensitive adhesive composition may contain any appropriate additive.
  • the additive include an antistatic agent, an antioxidant, and a coupling agent.
  • the kind of additive, the addition amount, the combination, and the like can be appropriately set according to the purpose.
  • the content of the base pressure-sensitive adhesive composition in the light diffusion pressure-sensitive adhesive layer used in the present invention is preferably 50 to 99.7% by weight, more preferably 52 to 97% by weight, and 70 to 97% by weight. More preferably.
  • the refractive index of the base pressure-sensitive adhesive composition is preferably 1.47 or more, more preferably 1.47 to 1.60, and further preferably 1.47 to 1.55. If the refractive index of a base adhesive composition is the said range, the refractive index difference with the light diffusible fine particle mentioned later can be made into a desired range. As a result, a light diffusion pressure-sensitive adhesive layer having a desired haze value after curing can be obtained, which is preferable.
  • the light diffusing pressure-sensitive adhesive layer is a layer in which light diffusing fine particles are dispersed in a pressure-sensitive adhesive layer formed from the base pressure-sensitive adhesive composition.
  • the light diffusing fine particles any appropriate one can be used as long as the effect of the present invention is obtained. Specific examples include inorganic fine particles and polymer fine particles. Among these, polymer fine particles are preferable.
  • the material of the polymer fine particles examples include silicone resin, methacrylic resin (for example, polymethyl methacrylate), polystyrene resin, polyurethane resin, and melamine resin. Since these resins have excellent dispersibility with respect to the base pressure-sensitive adhesive composition and an appropriate refractive index difference from the base pressure-sensitive adhesive composition, a light diffusion pressure-sensitive adhesive layer having excellent diffusion performance can be obtained. Among these, silicone resins and polymethyl methacrylate are particularly preferable.
  • the shape of the light diffusing fine particles can be, for example, a 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.
  • the refractive index of the light diffusing fine particles used in the present invention is preferably lower than the refractive index of the base pressure-sensitive adhesive composition.
  • the refractive index of the light diffusing fine particles is preferably 1.30 to 1.70, and more preferably 1.40 to 1.65. If the refractive index of the light diffusing fine particles is in the above range, the difference in refractive index from the base pressure-sensitive adhesive composition can be set to a desired range, and as a result, the light diffusing pressure-sensitive adhesive layer having a desired haze value after curing. Is preferable.
  • the absolute value of the difference in refractive index between the light diffusing fine particles and the base pressure-sensitive adhesive composition is preferably more than 0 and 0.2 or less, more preferably more than 0 and 0.15 or less. More preferably, the ratio is 0.01 to 0.13.
  • the volume average particle diameter of the light diffusing fine particles is preferably about 1 to 5 ⁇ m, more preferably about 2 to 5 ⁇ m, and further preferably about 2 to 4 ⁇ m. If the volume average particle diameter of the light diffusing fine particles is within the above range, a light diffusing pressure-sensitive adhesive layer having a desired haze value can be obtained by combining with the base pressure-sensitive adhesive composition, which is preferable.
  • the volume average particle diameter can be measured using, for example, an ultracentrifugal automatic particle size distribution measuring apparatus.
  • the content of the light diffusing fine particles in the light diffusing pressure-sensitive adhesive layer is not particularly limited, but is preferably 0.3 to 50% by weight, more preferably 3 to 48% by weight. More preferably, it is ⁇ 30% by weight. By setting the blending amount of the light diffusing fine particles in the above range, a light diffusing pressure-sensitive adhesive layer having excellent light diffusing performance can be obtained.
  • the light diffusing pressure-sensitive adhesive layer is formed by, for example, applying a light diffusing pressure-sensitive adhesive composition in which light diffusing fine particles are dispersed in the base pressure-sensitive adhesive composition to a support. It can be formed by removing the solvent and the like by drying. In applying the light diffusion pressure-sensitive adhesive composition, one or more solvents may be appropriately added. Further, when the base pressure-sensitive adhesive composition is an active energy ray curable type, a light diffusion is produced by preparing a prepolymer obtained by polymerizing a part of the base pressure-sensitive adhesive composition, and dispersing light diffusing fine particles in the prepolymer.
  • a light-diffusion pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive composition to a support and irradiating the coating layer with active energy rays such as ultraviolet rays.
  • the light diffusion pressure-sensitive adhesive layer can be formed by directly coating the light diffusion pressure-sensitive adhesive composition on an optical member such as a polarizing film described later.
  • the light diffusion pressure-sensitive adhesive layer has a thickness of 5 to 300 ⁇ m, preferably 5 to 250 ⁇ m, more preferably 50 to 250 ⁇ m, still more preferably 100 to 200 ⁇ m, more than 100 ⁇ m and not more than 200 ⁇ m. More preferably. It is preferable that the thickness of the light diffusing pressure-sensitive adhesive layer be in the above-mentioned range because the bonding can be performed following the fine unevenness of the material to be bonded or the uneven portion for imparting an optical function. In addition, when a transparent adhesive layer is bonded to the light diffusion adhesive layer, the thickness of the light diffusion adhesive layer is about 5 to 100 ⁇ m. It is preferable from the viewpoint of not affecting the bonding effect, and more preferably about 5 to 30 ⁇ m. Moreover, when a light-diffusion adhesive layer consists of two or more layers, the total value of the thickness of all the light-diffusion adhesive layers should just be in the said range.
  • Various methods are used as a method for applying the light diffusion adhesive composition. Specifically, for example, by roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
  • the heating and drying temperature is preferably about 30 ° C. to 200 ° C., more preferably 40 ° C. to 180 ° C., and further preferably 80 ° C. to 160 ° C. By setting the heating temperature in the above range, an adhesive layer having excellent adhesive properties can be obtained.
  • As the drying time an appropriate time can be adopted as appropriate.
  • the drying time is preferably about 5 seconds to 20 minutes, more preferably 30 seconds to 10 minutes, and further preferably 1 minute to 8 minutes.
  • a light diffusion pressure-sensitive adhesive layer can be formed by irradiating active energy rays such as ultraviolet rays.
  • active energy rays such as ultraviolet rays.
  • a high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a chemical light lamp, or the like can be used.
  • a peeled sheet can be used as the support.
  • a silicone release liner is preferably used as the release-treated sheet.
  • the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed on the release-treated sheet, the pressure-sensitive adhesive layer may be protected with a release-treated sheet (separator) until practical use. . In practical use, the peeled sheet is peeled off.
  • Examples of the constituent material of the separator may include porous materials such as plastic film, paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and appropriate thin leaves such as laminates thereof.
  • a plastic film is preferably used from the viewpoint of excellent surface smoothness.
  • plastic film examples include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, and ethylene.
  • plastic film examples include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, and ethylene.
  • -Vinyl acetate copolymer film and the like.
  • the thickness of the separator is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
  • silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, mold release and antifouling treatment with silica powder, coating type, kneading type, vapor deposition type, if necessary It is also possible to perform antistatic treatment such as.
  • the release property from the pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the separator.
  • the haze value of the formed light diffusion pressure-sensitive adhesive layer is preferably 10 to 99%, more preferably 10 to 96%, further preferably 20 to 96%, and more preferably 40 to 80%. It is particularly preferred. By setting the haze value in the above range, desired diffusion performance can be obtained, and generation of moire and glare can be favorably suppressed, which is preferable.
  • the light diffusing performance of the light diffusing adhesive can be controlled by adjusting the constituent material of the matrix (adhesive), the constituent material of the light diffusing fine particles, the volume average particle diameter, the blending amount, and the like.
  • the total light transmittance of the light diffusion pressure-sensitive adhesive layer is preferably 75% or more, more preferably 80% or more, and further preferably 85% or more.
  • the adhesive layer for optical members of this invention can contain transparent adhesive layers other than the said light-diffusion adhesive layer as above-mentioned.
  • the transparent adhesive layer is not particularly limited, and examples thereof include those formed from an adhesive composition containing a base polymer and a crosslinking agent.
  • the pressure-sensitive adhesive composition may be an acrylic, synthetic rubber-based, rubber-based, or silicone-based pressure-sensitive adhesive, but from the viewpoint of transparency and heat resistance, a (meth) acrylic polymer is a base polymer. An acrylic pressure-sensitive adhesive is preferred.
  • the monomer component contained in the (meth) acrylic polymer those mentioned in the base pressure-sensitive adhesive composition can be preferably used, but the alkyl (meth) acrylate (a1), the hydroxyl group-containing monomer (a3), And a (meth) acrylic polymer containing the nitrogen-containing monomer (a4) as a monomer component is preferred. Moreover, it is preferable that the monomer component contained in the said (meth) acrylic-type polymer does not contain a carboxyl group-containing monomer.
  • the blending ratio of each monomer and the method for forming the transparent pressure-sensitive adhesive layer can include the same methods as in the case of the light diffusion pressure-sensitive adhesive layer.
  • the haze of the transparent pressure-sensitive adhesive layer is not particularly limited, but is preferably 0.01 to 5%, more preferably 0.05 to 5%, and 0.1 to 3%. More preferably. It is preferable that the haze of the transparent pressure-sensitive adhesive layer is in the above range because optical design such as haze becomes easy.
  • the thickness of the transparent pressure-sensitive adhesive layer is not particularly limited, and when the pressure-sensitive adhesive layer is formed by laminating with the light diffusion pressure-sensitive adhesive layer, the total thickness may be 20 ⁇ m or more. Although not limited, it is preferably 20 to 300 ⁇ m, more preferably 50 to 300 ⁇ m. It is preferable that the thickness of the transparent pressure-sensitive adhesive layer be in the above-mentioned range since the bonding can be performed following a minute unevenness of a material to be bonded or an uneven portion for imparting an optical function.
  • the optical member pressure-sensitive adhesive layer of the present invention may be formed of only one light diffusion pressure-sensitive adhesive layer, and at least one light diffusion pressure-sensitive adhesive layer and It may be formed from at least one transparent adhesive layer.
  • the pressure-sensitive adhesive layer for an optical member of the present invention is preferably applied to an optical member, and the optical member is as described later.
  • optical members it can be preferably used for a brightness enhancement film and a polarizing film.
  • the haze value of the pressure-sensitive adhesive layer for an optical member of the present invention is 10 to 96%, preferably 20 to 96%, more preferably 30 to 96%. If the haze value is less than 10%, display unevenness occurs because the light from the backlight and the prism sheet is biased and cannot be eliminated. Further, when the haze value of the pressure-sensitive adhesive layer exceeds 96%, it is necessary to add a large amount of particles to the pressure-sensitive adhesive layer. In that case, the stress relaxation property and adhesiveness of the pressure-sensitive adhesive layer are lowered, and the durability is inferior. .
  • optical member with pressure-sensitive adhesive layer has at least one pressure-sensitive adhesive layer for optical members on at least one surface of the optical member.
  • optical member those used for manufacturing various image display devices and the like are used, and the type thereof is not particularly limited, and examples thereof include a polarizing film, a retardation plate, a brightness enhancement film, or an antiglare sheet. Can do.
  • the optical member is a laminate of two or more optical materials, such as a laminate of a polarizing film and a retardation plate, a laminate of retardation plates, a laminate of a polarizing film and a brightness enhancement film, or an antiglare sheet. There may be. Among these, a brightness enhancement film and a polarizing film are preferable.
  • polarizing film one having a transparent protective film on one side or both sides of a polarizer is generally used.
  • the polarizer is not particularly limited, and various types can be used.
  • polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer composed of a polyvinyl alcohol film and a dichroic substance such as iodine is preferable.
  • the thickness of these polarizers is not particularly limited, but is generally about 5 to 80 ⁇ m.
  • 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 iodine solution and stretching it 3 to 7 times the original length. If necessary, it can be immersed in an aqueous solution of potassium iodide or the like which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
  • the polyvinyl alcohol film In addition to washing the polyvinyl alcohol film surface with stains and antiblocking agents by washing the polyvinyl alcohol film with water, the polyvinyl alcohol film is also swollen to prevent unevenness such as uneven coloring. is there. Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. The film can be stretched even in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • a thin polarizer having a thickness of 10 ⁇ m or less can also be used.
  • the thickness is preferably 1 to 7 ⁇ m.
  • Such a thin polarizer is preferable in that the thickness unevenness is small, the visibility is excellent, the dimensional change is small, the durability is excellent, and the thickness of the polarizing plate can be reduced.
  • the thin polarizer typically, Japanese Patent Application Laid-Open No. 51-069644, Japanese Patent Application Laid-Open No. 2000-338329, International Publication No. 2010/100917, PCT / JP2010 / 001460, Examples thereof include thin polarizing films described in Japanese Patent Application Nos. 2010-269002 and 2010-263692.
  • These thin polarizing films can be obtained by a production method including a step of stretching and dyeing a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin substrate in the state of a laminate. With this production method, even if the PVA-based resin layer is thin, it can be stretched without problems such as breakage due to stretching by being supported by the stretching resin substrate.
  • PVA-based resin polyvinyl alcohol-based resin
  • polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
  • cellulose polymers such as diacetyl cellulose and triacetyl cellulose
  • acrylic polymers such as polymethyl methacrylate
  • styrene such as polystyrene and acrylonitrile / styrene copolymer (AS resin)
  • AS resin acrylonitrile / styrene copolymer
  • 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 Examples of the polymer that forms the transparent protective film include polymer blends.
  • 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.
  • the thickness of the protective film can be determined as appropriate, but is generally about 1 to 500 ⁇ m from the viewpoints of workability such as strength and handleability, and thin film properties.
  • the polarizer and the protective film are usually in close contact with each other through an aqueous adhesive or the like.
  • 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.
  • examples of the adhesive between the polarizer and the transparent protective film include an ultraviolet curable adhesive and an electron beam curable adhesive.
  • the electron beam curable polarizing film adhesive exhibits suitable adhesiveness to the various transparent protective films.
  • the adhesive used in the present invention can contain a metal compound filler.
  • the surface of the transparent protective film to which the polarizer is not bonded may be subjected to a treatment for the purpose of hard coat layer, antireflection treatment, sticking prevention, diffusion or antiglare.
  • FIG. 2 An example of a specific usage pattern of the optical member with an adhesive layer of the present invention is shown in FIG.
  • the polarizing film 10 (optical member with an adhesive layer) having the adhesive layer 1 for an optical member of the present invention can be used by bonding the adhesive layer surface to the step surface of the prism sheet 20. Since the optical member with the pressure-sensitive adhesive layer of the present invention has the pressure-sensitive adhesive layer for the optical member of the present invention, the optical member can be bonded without following the step.
  • the polarizing film 10 has a protective film 12 on both sides of the polarizer 11, but may be a single-sided protective polarizing film having the protective film 12 on one side of the polarizer 11.
  • the prism sheet 20 typically includes a substrate 22 and a prism portion 21.
  • the pressure-sensitive adhesive layer 1 for an optical member of the present invention has a light diffusing function, it can usually be used instead of a diffusion sheet provided on the backlight side of an image display device.
  • Image display device The image display device of the present invention is characterized by including the optical member with an adhesive layer.
  • the image display device of the present invention only needs to include the optical member with the pressure-sensitive adhesive layer of the present invention, and other configurations can be the same as those of the conventional image display device.
  • the image display device of the present invention includes the optical member with the pressure-sensitive adhesive layer, it has high reliability.
  • the pressure-sensitive adhesive layer for optical members of the present invention has a light diffusion function
  • the optical member with the pressure-sensitive adhesive layer can be used instead of the diffusion sheet provided on the backlight side, and the image display device is thinned. be able to.
  • an isocyanate crosslinking agent (trade name: Coronate L, adduct of tolylene diisocyanate of trimethylolpropane, manufactured by Nippon Polyurethane Industry Co., Ltd.) is added to 100 parts of the obtained prepolymer composition.
  • a base pressure-sensitive adhesive composition (A-1) was obtained.
  • the obtained base adhesive composition (A-1) had a refractive index of 1.475.
  • silicone resin fine particles (trade name: Tospearl 145, volume average particle size: 4 ⁇ m, refractive index: 1.43, silicone, as light diffusing fine particles 14 parts of resin fine particles (manufactured by Momentive Performance Materials) were added to obtain a light diffusion adhesive composition (A-1).
  • Production Examples 2 to 5 (Production of light diffusion adhesive compositions (A-2) to (A-5))
  • the light diffusing pressure-sensitive adhesive compositions (A-2) to (A-5) were the same as Production Example 1 except that the addition amount of the light diffusing fine particles was changed. Manufactured.
  • Production Example 6 (Production of light diffusion adhesive composition (A-6))
  • 100 parts of butyl acrylate, 5 parts of acrylic acid, 1 part of hydroxyethyl acrylate, 2,2′-azobisiso as a polymerization initiator
  • 0.1 parts of butyronitrile with 100 parts of ethyl acetate (monomer concentration 50%) After charging 0.1 parts of butyronitrile with 100 parts of ethyl acetate (monomer concentration 50%), introducing nitrogen gas with gentle stirring and replacing with nitrogen, the liquid temperature in the flask was kept at around 55 ° C.
  • a polymerization reaction was carried out for 8 hours to prepare a solution of an acrylic polymer (A-6) having a weight average molecular weight (Mw) of 1.8 million.
  • Mw weight average molecular weight
  • an isocyanate-based crosslinking agent (trade name: Coronate L, trimethylolpropane / tolylene diisocyanate trimer adduct, Nippon Polyurethane Industry 0.66 part, 0.3 parts of benzoyl peroxide (Niper BMT, manufactured by NOF Corporation), silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.2 Part was added to obtain a base pressure-sensitive adhesive composition (A-6).
  • an isocyanate-based crosslinking agent (trade name: Coronate L, trimethylolpropane / tolylene diisocyanate trimer adduct, Nippon Polyurethane Industry 0.66 part, 0.3 parts of benzoyl peroxide (Niper BMT, manufactured by NOF Corporation), silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.2 Part was added to obtain a base pressure-sensitive adhesive composition (A
  • Silicone resin fine particles (trade name: Tospearl 145, volume average particle size: 4 ⁇ m, refractive index: 1. ⁇ m) as light diffusing fine particles with respect to 100 parts of solid content of the obtained base pressure-sensitive adhesive composition (A-6). 43, silicone resin fine particles, manufactured by Momentive Performance Materials Co., Ltd.) were blended to prepare a light diffusion adhesive composition (A-6).
  • Production Example 7 (Production of light diffusion adhesive composition (A-7))
  • Production Example 6 as shown in Table 1, a light diffusing pressure-sensitive adhesive composition (A-7) was produced in the same manner as in Production Example 6 except that the addition amount of the light diffusing fine particles was changed.
  • Production Examples 8 to 12 (Production of light diffusion adhesive compositions (A-8) to (A-12))
  • Production Example 1 As shown in Table 1, the light diffusing pressure-sensitive adhesive compositions (A-8) to (A-12) were produced in the same manner as in Production Example 1 except that the addition amount of the light diffusing fine particles was changed. Manufactured.
  • Example 1 (Production of light diffusion adhesive layer) Release treatment of a 38 ⁇ m-thick polyester film (trade name: Diafoil MRF, manufactured by Mitsubishi Plastics Co., Ltd.) obtained by removing the light-diffusing adhesive composition (A-1) obtained in Production Example 1 with silicone on one side. On the surface, the obtained light diffusion pressure-sensitive adhesive layer was applied so that the thickness was 23 ⁇ m, thereby forming a coating layer. Next, a 38 ⁇ m thick polyester film (trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.) having one surface peeled with silicone is applied to the surface of the formed coating layer. It coat
  • a 38 ⁇ m-thick polyester film trade name: Diafoil MRF, manufactured by Mitsubishi Plastics Co., Ltd.
  • Examples 2 to 12 Comparative Examples 1 to 3, 6, 7
  • a pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 except that the light diffusion pressure-sensitive adhesive composition used and the thickness after drying were changed to those described in Table 2.
  • Example 13 Manufacture of first layer and third layer (transparent adhesive layer)
  • the transparent pressure-sensitive adhesive layer in the same manner as in Example 1, except that the light diffusion pressure-sensitive adhesive composition (A-8) obtained in Production Example 8 was used and the thickness of the pressure-sensitive adhesive layer obtained was 50 ⁇ m.
  • a pressure-sensitive adhesive sheet was prepared. Two identical pieces were produced.
  • One release sheet of the pressure-sensitive adhesive sheet for the transparent pressure-sensitive adhesive layer obtained above is peeled off, and a transparent pressure-sensitive adhesive layer is bonded to both surfaces of the light diffusion pressure-sensitive adhesive layer obtained above, and the pressure-sensitive adhesive layer for optical members Formed.
  • Example 14 A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 13 except that the light diffusion pressure-sensitive adhesive composition used and the thickness after drying were changed to those described in Table 2.
  • Example 15 Manufacture of second layer (light diffusion adhesive layer) Release treatment of a 38 ⁇ m-thick polyester film (trade name: Diafoil MRF, manufactured by Mitsubishi Plastics Co., Ltd.) obtained by peeling off the light diffusing pressure-sensitive adhesive composition (A-10) obtained in Production Example 10 with silicone on one side On the surface, the obtained light diffusion pressure-sensitive adhesive layer was applied so that the thickness was 23 ⁇ m, thereby forming a coating layer. Next, a 38 ⁇ m thick polyester film (trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.) having one surface peeled with silicone is applied to the surface of the formed coating layer. It coat
  • a 38 ⁇ m thick polyester film trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.
  • the coating layer of the light diffusion adhesive composition was shielded from oxygen.
  • a chemical light lamp manufactured by Toshiba Corporation
  • ultraviolet rays having an illuminance of 100 mW / cm 2 measured with Topcon UVR-T1 having a maximum sensitivity of about 350 nm
  • Irradiation was performed for 30 seconds, the coating layer was cured to form a light diffusion pressure-sensitive adhesive layer, and a pressure-sensitive adhesive sheet was produced.
  • the polyester film coated on both sides of the pressure-sensitive adhesive layer functions as a release liner.
  • Example 13 A pressure-sensitive adhesive sheet was produced in the same manner as in Example 13 except that the pressure-sensitive adhesive layer was used as the second layer (light diffusion pressure-sensitive adhesive layer).
  • Examples 16 and 17, Comparative Examples 4 and 5 A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 15 except that the light diffusing pressure-sensitive adhesive composition used and the thickness were changed to those shown in Table 2.
  • a polarizing film in which a brightness enhancement film (trade name: DBEF-Q, manufactured by 3M) was bonded onto a polarizing film (trade name: CVT, manufactured by Nitto Denko Corporation) was prepared.
  • One release film of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was peeled off and bonded to the brightness enhancement film side of the polarizing film.
  • the other release film of the pressure-sensitive adhesive sheet was peeled off, and bonded to a prism sheet having 50 ⁇ m or 5 ⁇ m unevenness with a hand roller, and autoclaved at 50 ° C. and 5 atm for 15 minutes. The state after bonding was visually confirmed and evaluated according to the following evaluation criteria.
  • a sample obtained by bonding the polarizing film to the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was cut into a size of 400 mm long ⁇ 250 mm wide to prepare a sample.
  • This sample was bonded to a non-alkali glass plate having a thickness of 0.07 mm with a laminator, and a polarizing plate with a transparent adhesive layer was bonded to the opposite side so as to be in a crossed Nicol state, and then at 50 ° C., 5 atm for 15 minutes.
  • An autoclave treatment was performed to prepare an evaluation sample. Then, it put on the backlight of 10,000 candela, the light leak was observed visually, and the corner nonuniformity was evaluated on the following reference

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
PCT/JP2016/073457 2015-08-25 2016-08-09 光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置 WO2017033741A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020177036994A KR102543355B1 (ko) 2015-08-25 2016-08-09 광학 부재용 점착제층, 점착제층을 갖는 광학 부재 및 화상 표시 장치
CN201680047018.4A CN107922807B (zh) 2015-08-25 2016-08-09 光学构件用粘合剂层、带有粘合剂层的光学构件以及图像显示装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015165888A JP6670060B2 (ja) 2015-08-25 2015-08-25 光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置
JP2015-165888 2015-08-25

Publications (1)

Publication Number Publication Date
WO2017033741A1 true WO2017033741A1 (ja) 2017-03-02

Family

ID=58100013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/073457 WO2017033741A1 (ja) 2015-08-25 2016-08-09 光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置

Country Status (5)

Country Link
JP (1) JP6670060B2 (zh)
KR (1) KR102543355B1 (zh)
CN (1) CN107922807B (zh)
TW (2) TWI752915B (zh)
WO (1) WO2017033741A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019101294A (ja) * 2017-12-05 2019-06-24 大日本印刷株式会社 光学積層体及び画像表示装置
CN112442321A (zh) * 2019-09-05 2021-03-05 琳得科株式会社 粘着片、背光源单元及显示装置

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6834369B2 (ja) * 2016-11-07 2021-02-24 王子ホールディングス株式会社 粘着シート及び積層体
JP6908379B2 (ja) * 2016-12-27 2021-07-28 リンテック株式会社 粘着シートおよび液晶表示部材
DE102017003362A1 (de) * 2017-04-06 2018-10-11 Carl Freudenberg Kg Element zur Lichtmanipulation
KR102146998B1 (ko) * 2017-10-26 2020-08-21 국도화학 주식회사 이방 도전성 필름, 이를 포함하는 접속 구조체 및 이를 포함하는 디스플레이 장치
JP2019196468A (ja) * 2018-05-11 2019-11-14 日東電工株式会社 粘着剤層、その製造方法、粘着シート、粘着剤層付光学フィルムおよび画像表示装置
JP7164980B2 (ja) * 2018-07-12 2022-11-02 リンテック株式会社 粘着シートおよび防眩性シート
CN109143764A (zh) * 2018-11-05 2019-01-04 成都菲斯特科技有限公司 成像结构、投影屏幕及投影系统
JP6906560B2 (ja) * 2019-04-03 2021-07-21 リンテック株式会社 粘着シートおよび表示体
JP7340998B2 (ja) * 2019-09-05 2023-09-08 リンテック株式会社 バックライトユニットおよび表示装置
JP7340997B2 (ja) * 2019-09-05 2023-09-08 リンテック株式会社 粘着シートおよび光学積層体
JP7383448B2 (ja) * 2019-10-18 2023-11-20 リンテック株式会社 粘着剤、粘着シート、バックライトユニットおよび表示装置
KR20230158465A (ko) 2021-03-24 2023-11-20 린텍 가부시키가이샤 점착 시트 및 구성체의 제조 방법

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001089731A (ja) * 1999-09-20 2001-04-03 Lintec Corp 粘着剤組成物及びそれを用いた接着性光学機能部材
JP2004177781A (ja) * 2002-11-28 2004-06-24 Nitto Denko Corp 楕円偏光板および画像表示装置
JP2005263994A (ja) * 2004-03-18 2005-09-29 Soken Chem & Eng Co Ltd 光拡散反射遮光性粘着テープ及びそれを用いるフラットパネル型ディスプレイ装置
JP2008310267A (ja) * 2007-06-18 2008-12-25 Daio Paper Corp 光拡散性粘着シート
JP2009209329A (ja) * 2008-03-06 2009-09-17 Nitto Denko Corp 光散乱粘着剤組成物、光散乱粘着剤層、光散乱粘着シート、及びこれらを用いたバックライトシステム
JP2013010839A (ja) * 2011-06-28 2013-01-17 Lintec Corp 粘着性組成物、粘着剤および粘着シート
WO2014042110A1 (ja) * 2012-09-13 2014-03-20 日東電工株式会社 光学部材、偏光板のセットおよび液晶表示装置
JP2014227453A (ja) * 2013-05-21 2014-12-08 日東電工株式会社 粘着シートおよび積層体

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6285127B2 (ja) 2012-09-13 2018-02-28 日東電工株式会社 光拡散粘着剤ならびに該光拡散粘着剤を用いた偏光板および光学部材

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001089731A (ja) * 1999-09-20 2001-04-03 Lintec Corp 粘着剤組成物及びそれを用いた接着性光学機能部材
JP2004177781A (ja) * 2002-11-28 2004-06-24 Nitto Denko Corp 楕円偏光板および画像表示装置
JP2005263994A (ja) * 2004-03-18 2005-09-29 Soken Chem & Eng Co Ltd 光拡散反射遮光性粘着テープ及びそれを用いるフラットパネル型ディスプレイ装置
JP2008310267A (ja) * 2007-06-18 2008-12-25 Daio Paper Corp 光拡散性粘着シート
JP2009209329A (ja) * 2008-03-06 2009-09-17 Nitto Denko Corp 光散乱粘着剤組成物、光散乱粘着剤層、光散乱粘着シート、及びこれらを用いたバックライトシステム
JP2013010839A (ja) * 2011-06-28 2013-01-17 Lintec Corp 粘着性組成物、粘着剤および粘着シート
WO2014042110A1 (ja) * 2012-09-13 2014-03-20 日東電工株式会社 光学部材、偏光板のセットおよび液晶表示装置
JP2014227453A (ja) * 2013-05-21 2014-12-08 日東電工株式会社 粘着シートおよび積層体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019101294A (ja) * 2017-12-05 2019-06-24 大日本印刷株式会社 光学積層体及び画像表示装置
CN112442321A (zh) * 2019-09-05 2021-03-05 琳得科株式会社 粘着片、背光源单元及显示装置

Also Published As

Publication number Publication date
TWI752915B (zh) 2022-01-21
KR20180044233A (ko) 2018-05-02
KR102543355B1 (ko) 2023-06-16
CN107922807B (zh) 2020-11-13
JP6670060B2 (ja) 2020-03-18
TW201715006A (zh) 2017-05-01
JP2017043678A (ja) 2017-03-02
CN107922807A (zh) 2018-04-17
TW202039752A (zh) 2020-11-01

Similar Documents

Publication Publication Date Title
WO2017033741A1 (ja) 光学部材用粘着剤層、粘着剤層付光学部材、及び画像表示装置
JP6045742B1 (ja) セパレータ付粘着剤層およびその製造方法、セパレータ付粘着剤層付偏光フィルムおよびその製造方法、ならびに画像表示装置
JP6057600B2 (ja) 粘着剤、粘着剤層、および粘着シート
JP6370029B2 (ja) 粘着剤層付偏光フィルムおよび画像表示装置
WO2014020821A1 (ja) 粘着剤組成物、粘着剤層、粘着シート、表面保護シート、光学用表面保護シート及び表面保護シート付き光学フィルム
JP2013006892A (ja) 光学用両面粘着シート
JP6691271B2 (ja) 粘着剤層、粘着剤層付光学フィルム、光学積層体、および画像表示装置
JP6916196B2 (ja) 光学用粘着剤層、光学用粘着剤層の製造方法、粘着剤層付光学フィルム、及び、画像表示装置
JP7128945B2 (ja) 光学用粘着剤層、光学用粘着剤層の製造方法、粘着剤層付光学フィルム、及び、画像表示装置
JPWO2019031486A1 (ja) 粘着剤層、粘着剤層付光学フィルム、光学積層体、および画像表示装置
JP6068543B2 (ja) 液晶パネル及び画像表示装置
WO2018164052A1 (ja) 光学機能層付光学部材
TWI763791B (zh) 液晶面板及液晶顯示裝置
JP6938616B2 (ja) 光学機能層付偏光フィルムおよび液晶表示装置
CN113242987A (zh) 带粘合剂层的偏振膜
WO2024106486A1 (ja) 粘着剤組成物、粘着シート、光学積層体、及び画像表示装置
TWI759438B (zh) 偏光薄膜用黏著劑組成物、偏光薄膜用黏著劑層、附黏著劑層之偏光薄膜、液晶面板及液晶顯示裝置
WO2019235064A1 (ja) 液晶表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16839088

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20177036994

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16839088

Country of ref document: EP

Kind code of ref document: A1