WO2015190560A1 - タッチパネル用紫外線硬化型接着剤組成物及び物品 - Google Patents
タッチパネル用紫外線硬化型接着剤組成物及び物品 Download PDFInfo
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- WO2015190560A1 WO2015190560A1 PCT/JP2015/066888 JP2015066888W WO2015190560A1 WO 2015190560 A1 WO2015190560 A1 WO 2015190560A1 JP 2015066888 W JP2015066888 W JP 2015066888W WO 2015190560 A1 WO2015190560 A1 WO 2015190560A1
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- acrylate
- adhesive composition
- curable adhesive
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Classifications
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- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09J175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
Definitions
- the present invention relates to an ultraviolet curable adhesive composition for a touch panel for bonding at least two optical substrates, and a method for producing an optical member using the same.
- a touch panel In recent years, display devices that allow screen input by attaching a touch panel to a display screen of a display device such as a liquid crystal display, a plasma display, or an organic EL display have been widely used.
- a glass plate or a resin film on which a transparent electrode is formed is bonded with a slight gap facing each other. If necessary, a transparent protection made of glass or resin is provided on the touch surface. It has a structure in which plates are bonded together.
- Patent Document 1 discloses a technique in which an organic peroxide is contained in an ultraviolet curable resin and heated after ultraviolet irradiation to cure the resin in the light shielding portion. It is disclosed. However, there is a concern that the heating process may damage the liquid crystal display device and the like. Furthermore, since a heating step of usually 60 minutes or more is required to make the resin sufficiently cured, there is a problem that productivity is poor.
- Japanese Patent Application Laid-Open No. H10-228561 discloses a technique for curing the resin of the light shielding part by irradiating ultraviolet rays from the outer side surface of the light shielding part forming surface.
- Patent Document 3 discloses a technique using the slow-acting property of a cationic polymerizable ultraviolet curable resin, but the flexibility of the cured resin is inferior.
- the present invention is less damaging to the optical substrate, has good productivity, can provide an optical member such as a display unit having good curability and adhesion, and has high adhesion to the substrate, Even when the optical base material is pasted after applying the ultraviolet curable adhesive composition to the optical base material and then irradiating the coating layer with ultraviolet light, an optical member (such as a touch panel) having high adhesive strength can be obtained.
- An object of the present invention is to provide an ultraviolet curable adhesive composition for a touch panel.
- the present inventors have completed the present invention as a result of intensive studies in order to solve the above problems. That is, the present invention relates to the following (1) to (12).
- An ultraviolet curable adhesive for a touch panel comprising a polyurethane compound (E) obtained by reacting the compound (A) and the compound (B), the compound (C) and the compound (D) shown below.
- Agent composition obtained by reacting the compound (A) and the compound (B), the compound (C) and the compound (D) shown below.
- Compound (D): Diol compound other than compound (A) ( 2)
- the ultraviolet curable adhesive composition for touch panels comprising the polyurethane compound (E) according to (1), wherein the hydrogenated polybutadiene polyol compound (A) has an iodine value of 20 or less.
- An ultraviolet curable adhesive composition for a touch panel comprising the polyurethane compound (E) according to (1) or (2), wherein the polyisocyanate compound (B) is an aliphatic diisocyanate compound.
- the cured film of the ultraviolet curable adhesive composition containing the polyurethane compound of the present invention has excellent flexibility, high moisture resistance, heat resistance, and light resistance, and has a defect in the touch panel as an ultraviolet curable adhesive composition for touch panels. It is possible to effectively prevent the occurrence.
- the polyurethane compound (E) of the present invention is first reacted (hereinafter referred to as the first reaction) with the diol compound (D) other than the hydrogenated polybutadiene polyol (A) and the compound (A) and the polyisocyanate compound (B).
- the (meth) acrylate compound (C) having at least one hydroxyl group is reacted with the remaining isocyanate group (hereinafter referred to as a second reaction).
- the resulting polyurethane compound (E) preferably has a weight average molecular weight of 5,000 to 30,000, more preferably 10,000 to 20,000, and particularly preferably 13,000 to 15,000.
- the R value is preferably 1.1 to 2.0, more preferably 1.1 to 1.5.
- any hydrogenated reduction product of a general polybutadiene polyol can be used.
- the iodine value is particularly preferably 20 or less.
- the hydroxyl value is preferably 400 or less, and more preferably 300 or less. Although a minimum is not specifically limited, For example, what is necessary is just 0.1 or more.
- the molecular weight of (A) all generally available molecular weight distributions can be used, but those having a weight average molecular weight of 500 to 3000 are particularly preferred particularly when the balance between flexibility and curability is achieved. .
- the molecular weight of (A) all generally available molecular weight distributions can be used, but those having a number average molecular weight of 500 to 5000 are preferred particularly when the balance between flexibility and curability is achieved. Those of 500 to 3000 are particularly preferred.
- Examples of commercially available hydrogenated polybutadiene polyols (A) include Nippon Soda Co., Ltd .: GI-1000, GI-2000, GI-3000, CRAY VALLEY KRASOL HLBP-H 1000, HLBP-H 2000, HLBP-H 3000 etc. are mentioned. In addition, what contains an alkali salt can be used conveniently.
- diol compound (D) other than the compound (A) used in the first reaction of the present invention include, for example, polyethers such as polyethylene glycol, polybutylene glycol, polytetramethylene glycol, polypropylene glycol, and polyethylene glycol.
- Polyols polyethylene glycol adipate, poly 1,4-butanediol adipate, polyester polyols such as polycaprolactone, glycols such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol and neopentyl glycol, cyclohexane dimethylol, Polyisoprene glycol, polybutadiene glycol, hydrogenated bisphenol A, hydrogenated bisphenol F, spiro skeleton-containing alcohol, tricyclodeca Aliphatic alcohols such as dimethylol and pentacyclopentadecane dimethylol and their alkylene oxide adducts, hydrogenated polyisoprene, branched or linear long chain alkyl diols such as hydrogenated polybutadiene diols, bisphenol A, bisphenol F, etc.
- polyester polyols such as polycaprolactone
- the polyester polyol obtained by reaction of an acid etc. can be mentioned.
- polyether polyols in order to improve flexibility and compatibility in the cured product of the ultraviolet curable adhesive composition of the present invention.
- the molecular weight of the diol compound (D) other than the compound (A) all generally available molecular weight distributions can be used, but the number average molecular weight is particularly 50 when the balance between flexibility and curability is achieved. ⁇ 6000 is preferred, and 100 ⁇ 4000 is particularly preferred.
- the structure derived from the diol compound (D) other than the compound (A) particularly preferably a polyether polyol such as polyethylene glycol
- the polyethylene glycol skeleton and water are incorporated.
- the number average molecular weight of polyethylene glycol is more preferably 2000 or less, and particularly preferably 500 or less.
- a diol compound (D) other than the compound (A) is a diol other than the hydrogenated polybutadiene polyol (A) and the compound (A).
- the compound (D) is preferably incorporated in an amount of 5 to 10 mol%.
- the hydroxyl value is preferably 400 or less, and more preferably 300 or less.
- polyethylene glycol which is an example of polyether polyols that can be suitably used in the first reaction of the present invention
- all commercially available polyethylene glycols can be used.
- PEG # 200T, PEG # 200, PEG # 300, PEG # 400, PEG # 600, PEG # 1000, PEG # 1500, PEG # 1540, PEG # 200, PEG # 4000, PEG # 4000P, PEG # 6000, PEG # 6000P, PEG # 11000, PEG # 20000, and the like, and urethane grades and the like whose moisture are controlled can also be used.
- the water content is preferably 2% or less, particularly preferably 1% or less, in order to suppress thickening due to an increase in molecular weight.
- hydrogenated polybutadiene polyol (A) and diol compound (D) other than compound (A) (particularly preferably polyether polyol such as polyethylene glycol) are used for the reaction.
- diol compound (D) other than compound (A) (particularly preferably, a polyether polyol such as polyethylene glycol) is not particularly limited, but (A) component: (D) component is 9.999 in molar ratio. : 0.001 to 1: 9 is preferable, 9.999: 0.001 to 3: 7 is more preferable, and 9.999: 0.001 to 4: 6 is particularly preferable.
- the number average molecular weight of the hydrogenated polybutadiene polyol (A) used in the present invention is the number average molecular weight of a diol compound (D) other than the compound (A) used (particularly preferably a polyether polyol such as polyethylene glycol). It is preferable to use a larger one in combination.
- the number average molecular weight of the diol compound (D) other than the compound (A) (particularly preferably a polyether polyol such as polyethylene glycol) +500 is used as a hydrogenated polybutadiene polyol ( More preferably, the hydrogenated polybutadiene polyol (A) has a number average molecular weight of the diol compound (D) other than the compound (A) (particularly preferably a polyether polyol such as polyethylene glycol) +1000. Especially to have Masui.
- the polyisocyanate compound (B) used in the first reaction of the present invention is a compound comprising two or more isocyanate groups in one molecule, and examples thereof include aliphatic diisocyanate compounds and aromatic diisocyanates. Compounds, trimers thereof, and the like.
- the aliphatic diisocyanate compound as used herein means a diisocyanate compound in which an isocyanate group is bonded to a chain carbon atom, and a diisocyanate compound in which an isocyanate group is bonded to a carbon atom of a cyclic saturated hydrocarbon, and an aromatic diisocyanate compound.
- Examples of the aliphatic diisocyanate compound include 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,3-diisocyanate cyclohexane, 1,4-diisocyanate.
- aromatic diisocyanate compounds include tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, tolidine diisocyanate, 1,6-phenylene diisocyanate, 1,4-phenylene diisocyanate, 1,6-phenylene. And diisocyanate monomers such as diisocyanate.
- an aliphatic diisocyanate compound and a trimer of the aliphatic diisocyanate compound are preferable because they improve the moisture resistance and heat resistance of the coating film.
- the trimer of the aliphatic diisocyanate compound include the above-mentioned aliphatic isocyanate-based isocyanurate-type polyisocyanates, and specific examples include hexamethylene diisocyanate and isophorone diisocyanate. These may be used alone or in a mixture.
- the first reaction is charged in an equivalent relationship (B / (A + D)> 1: [NCO] / [OH] molar ratio) such that isocyanate groups remain after the reaction.
- B / (A + D)> 1: [NCO] / [OH] molar ratio a large amount of unreacted polyisocyanate compound (B) is present, which may affect the flexibility of the ultraviolet curable adhesive composition.
- the preparation ratio is reduced, the molecular weight increases and the curability of the ultraviolet curable adhesive composition may be affected.
- the OH group of the alcohol compound (A + D) is 0.1 to 0.9 mol with respect to 1.0 mol of the NCO group of the polyisocyanate compound (B).
- the first reaction can be carried out without a solvent, but in a solvent having a high viscosity of the product and having no alcoholic hydroxyl group for improving workability or in a polymerizable compound (F) described later. It is preferable to do so.
- the solvent include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, aromatic hydrocarbons such as benzene, toluene, xylene, and tetramethylbenzene, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, and dipropylene glycol.
- Glycol ethers such as dimethyl ether, dipropylene glycol diethyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, ethyl acetate, butyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, carbitol acetate, propylene glycol monomethyl ether acetate , Propylene glycol monoethyl ether acetate, Propylene glycol monomethyl ether acetate, esters such as dialkyl glutarate, dialkyl succinate, dialkyl adipate, cyclic esters such as ⁇ -butyrolactone, petroleum solvents such as petroleum ether, petroleum naphtha, hydrogenated petroleum naphtha, solvent naphtha, etc. Can be carried out alone or in a mixed organic solvent.
- the reaction temperature is usually in the range of 30 to 150 ° C, preferably 50 to 100 ° C.
- the end point of the reaction is confirmed by a decrease in the amount of isocyanate.
- a catalyst may be added for the purpose of shortening the reaction time.
- this catalyst either a basic catalyst or an acidic catalyst is used.
- the basic catalyst include amines such as pyridine, pyrrole, triethylamine, diethylamine, dibutylamine and ammonia, and phosphines such as tributylphosphine and triphenylphosphine.
- acidic catalysts examples include copper naphthenate, cobalt naphthenate, zinc naphthenate, tributoxyaluminum, titanium tetraisopropoxide, zirconium tetrabutoxide, aluminum chloride, tin octylate, octyltin trilaurate, dibutyltin dilaurate, Mention may be made of Lewis acid catalysts such as octyltin diacetate. The amount of these catalysts added is usually 0.1 to 1 part by weight based on 100 parts by weight of the total weight of the diol compound (A + D) and the polyisocyanate compound (B).
- the polyurethane compound (E) of the present invention is obtained by reacting (second reaction) a (meth) acrylate compound (C) having at least one hydroxyl group with respect to the remaining isocyanate group after the first reaction. be able to.
- the (meth) acrylate compound (C) having at least one hydroxyl group used in the second reaction of the present invention is a compound having at least one hydroxyl group and one (meth) acrylate in each molecule.
- the second reaction of the present invention is charged in an equivalent relationship such that the isocyanate group of the intermediate obtained after the first reaction is eliminated.
- the OH group of the (meth) acrylate compound (C) having at least one hydroxyl group is 1.0 to 3.3 mol per 1.0 mol of the NCO group of the intermediate obtained after the first reaction.
- the amount is 0 mol, more preferably 1.0 to 2.0 mol.
- the second reaction of the present invention can also be carried out in the absence of a solvent, but is preferably carried out in the above-mentioned solvent and / or in the polymerizable compound (F) described later for improving workability because the product has a high viscosity.
- the reaction temperature is usually in the range of 30 to 150 ° C, preferably 50 to 100 ° C.
- the end point of the reaction is confirmed by a decrease in the amount of isocyanate.
- the aforementioned catalyst may be added for the purpose of shortening the reaction time.
- a polymerization inhibitor such as 4-methoxyphenol is already added to the acrylate compound used as a raw material, but a polymerization inhibitor may be added again during the reaction.
- examples of such polymerization inhibitors include hydroquinone, 4-methoxyphenol, 2,4-dimethyl-6-t-butylphenol, 2,6-di-t-butyl-4-cresol, 3-hydroxythiophenol, Examples include p-benzoquinone, 2,5-dihydroxy-p-benzoquinone, and phenothiazine. The amount used is 0.01 to 1% by weight based on the reaction raw material mixture.
- the ultraviolet curable adhesive composition for a touch panel of the present invention can contain a polymerizable compound (F) other than the polyurethane compound (E) of the present invention and the component (E).
- the polymerizable compound (F) is not particularly limited, but is selected from the group consisting of urethane (meth) acrylate, (meth) acrylate having a polyisoprene skeleton, (meth) acrylate having a polybutadiene skeleton, and a (meth) acrylate monomer.
- (meth) acrylate means either one or both of methacrylate and acrylate.
- (meth) acrylic acid” and the like are examples of urethane (meth) acrylate or (meth) acrylate having a polyisoprene skeleton.
- the urethane (meth) acrylate that can be used in combination with the ultraviolet curable adhesive composition for a touch panel of the present invention is obtained by reacting at least one (meth) acryloyloxy group-containing hydroxy compound and an isocyanate compound (further as an optional component, a polyol). It is a general term for the obtained (meth) acrylate.
- hydroxy compound having at least one (meth) acryloyloxy group include, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4- Hydroxyethyl (meth) acrylate, cyclohexanedimethanol mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) )
- a (meth) acrylate compound having various hydroxyl groups such as acrylate, and a ring-opening reaction product of the above-mentioned (meth) acrylate compound having a hydroxyl group and ⁇ -caprolactone. Door can be.
- isocyanate compound examples include, for example, P-phenylene diisocyanate, m-phenylene diisocyanate, P-xylene diisocyanate, m-xylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4 ′.
- -Aromatic diisocyanates such as diphenylmethane diisocyanate and naphthalene diisocyanate; aliphatic or alicyclic diisocyanates such as isophorone diisocyanate, hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, hydrogenated xylene diisocyanate, norbornene diisocyanate, lysine diisocyanate ; Trimerization of one or more burettes of isocyanate monomers or the above diisocyanate compounds Polyisocyanates of the isocyanate and the like; the and the isocyanate compound include polyisocyanates obtained by urethane reaction of the polyol compound.
- the polyol that can be used as an optional component is not particularly limited as long as it is a known polyol.
- Specific examples include, for example, polyether polyols such as polyethylene glycol, polybutylene glycol, polytetramethylene glycol, polypropylene glycol and polyethylene glycol, and polyester polyols such as polyethylene glycol adipate, poly 1,4-butanediol adipate and polycaprolactone.
- Glycols such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol and neopentyl glycol, cyclohexane dimethylol, polyisoprene glycol, polybutadiene glycol, hydrogenated bisphenol A, hydrogenated bisphenol F, spiro skeleton-containing alcohol, Alicyclic alkanes such as tricyclodecane dimethylol and pentacyclopentadecane dimethylol And alkylene oxide adducts thereof, hydrogenated polyisoprene, branched or linear long chain alkyl diols such as diols of hydrogenated polybutadiene, bisphenols such as bisphenol A and bisphenol F, and alkylene oxide adducts of bisphenols, Examples include polyols such as trimethylolpropane, ditrimethylolpropane, pentaerythritol and dip
- the weight average molecular weight of the urethane (meth) acrylate is preferably about 7000 to 25000, and more preferably 10,000 to 20000. When the weight average molecular weight is less than 7000, shrinkage increases, and when the weight average molecular weight is greater than 25000, curability is poor.
- urethane (meth) acrylate may be used alone or in combination of two or more in any proportion.
- the weight ratio of urethane (meth) acrylate in the ultraviolet curable agent composition for touch panel of the present invention is usually 20 to 80% by weight, preferably 30 to 70% by weight.
- the (meth) acrylate having the polyisoprene skeleton has a (meth) acryloyl group at the terminal or side chain of the polyisoprene molecule.
- a (meth) acrylate having a polyisoprene skeleton can be obtained as “UC-203” (manufactured by Kuraray Co., Ltd.).
- the (meth) acrylate having a polyisoprene skeleton preferably has a polystyrene-equivalent number average molecular weight of 1,000 to 50,000, more preferably about 25,000 to 45,000.
- the weight ratio of the (meth) acrylate having a polyisoprene skeleton in the photocurable transparent adhesive composition of the present invention is usually 20 to 80% by weight, preferably 30 to 70% by weight.
- the (meth) acrylate having the polybutadiene skeleton has a (meth) acryloyl group at the terminal or side chain of the polybutadiene molecule.
- the (meth) acrylates having a polybutadiene skeleton are "TEAI-1000 (Nippon Soda Co., Ltd.)", “TE-2000 (Nippon Soda Co., Ltd.)", “EMA-3000 (Nippon Soda Co., Ltd.)” Manufactured by Kogyo Co., Ltd.).
- the (meth) acrylate having a polybutadiene skeleton preferably has a polystyrene-equivalent number average molecular weight of 1,000 to 30,000, more preferably about 1,000 to 10,000.
- the weight ratio of the (meth) acrylate having a polybutadiene skeleton in the photocurable transparent adhesive composition of the present invention is usually 10 to 80% by weight, preferably 20 to 70% by weight.
- the (meth) acrylate monomer a (meth) acrylate having one (meth) acryloyl group in the molecule can be preferably used.
- the (meth) acrylate monomer indicates (meth) acrylate excluding the urethane (meth) acrylate, the following epoxy (meth) acrylate, and the (meth) acrylate having the polyisoprene skeleton.
- the (meth) acrylate having one (meth) acryloyl basis in the molecule include isooctyl (meth) acrylate, isoamyl (meth) acrylate, lauryl (meth) acrylate, isodecyl (meth) acrylate, stearyl ( Alkyl (meth) acrylates having 5 to 20 carbon atoms such as (meth) acrylate, cetyl (meth) acrylate, isomyristyl (meth) acrylate, tridecyl (meth) acrylate, etc.
- alkyl (meth) acrylates preferably 10 carbon atoms from the viewpoint of volatility and solubility
- alkyl (meth) acrylates more preferably 10 to 20 carbon atoms having a branched chain (meth) acrylate), benzyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acryloylmorpholine, phenylglycine (Meth) acrylate, tricyclodecane (meth) acrylate, dicyclopentenyl acrylate, dicyclopentenyloxyethyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 1-adamantyl acrylate, 2 -Having a cyclic skeleton such as methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl acrylate, 1-adamantyl methacrylate, polypropy
- alkyl (meth) acrylates having 10 to 20 carbon atoms, 2-ethylhexyl carbitol acrylate, acryloylmorpholine, 4-hydroxybutyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, isostearyl (meth) acrylate, dicyclo Pentenyloxyethyl (meth) acrylate and polypropylene oxide-modified nonylphenyl (meth) acrylate are preferred.
- alkyl (meth) acrylate having 10 to 20 carbon atoms, dicyclopentenyloxyethyl (meth) Preferred are acrylate, polypropylene oxide-modified nonylphenyl (meth) acrylate, and tetrahydrofurfuryl (meth) acrylate.
- an alkyl (meth) acrylate having 1 to 5 carbon atoms having a hydroxyl group and acryloylmorpholine are preferable, and acryloylmorpholine is particularly preferable.
- the (meth) acrylate monomer refers to (meth) acrylate excluding urethane (meth) acrylate, epoxy (meth) acrylate, and (meth) acrylate having a polyisoprene skeleton.
- composition of the present invention can contain (meth) acrylates other than (meth) acrylate having one (meth) acryloyl group as long as the characteristics of the present invention are not impaired.
- Trimethylol C2-C10 alkanes such as caprolactone-modified hydroxypivalic acid neopentyl glycol di (meth) acrylate and ethylene oxide-modified phosphoric acid di (meth) acrylate
- Tri (meth) acrylate trimethylolpropane polyethoxytri (me
- these (meth) acrylate monomer components can be used 1 type or in mixture of 2 or more types in arbitrary ratios.
- the weight ratio of the (meth) acrylate monomer in the photocurable transparent adhesive composition of the present invention is usually 5 to 70% by weight, preferably 10 to 50% by weight. When it is less than 5% by weight, the curability is poor, and when it is more than 70% by weight, shrinkage increases.
- (I) and (ii) are generally 25 to 90% by weight, 40 to 90% by weight, more preferably 40 to 80% by weight, based on the total amount of the resin composition.
- epoxy (meth) acrylate can be used as long as the characteristics of the present invention are not impaired.
- Epoxy (meth) acrylate has a function of improving curability and improving the hardness and curing speed of a cured product.
- Epoxy (meth) acrylate is a general term for (meth) acrylate obtained by reacting an epoxy resin containing one or more functional epoxy groups with (meth) acrylic acid. (Meth) acrylic acid is reacted at a ratio of 0.9 to 1.5 mol, more preferably 0.95 to 1.1 mol, per 1 equivalent of epoxy group of the glycidyl ether type epoxy compound.
- the reaction temperature is preferably 80 to 120 ° C., and the reaction time is about 10 to 35 hours.
- a catalyst such as triphenylphosphine, TAP, triethanolamine, or tetraethylammonium chloride.
- paramethoxyphenol, methylhydroquinone or the like can be used as a polymerization inhibitor.
- epoxy resins used as raw materials for epoxy (meth) acrylates include phenyl diglycidyl ethers such as hydroquinone diglycidyl ether, catechol diglycidyl ether, resorcinol diglycidyl ether; bisphenol-A type epoxy resin, bisphenol-F type epoxy Bisphenol-type epoxy compounds such as resins, bisphenol-S type epoxy resins, 2,2-bis (4-hydroxyphenyl) -1,1,1,3,3,3-hexafluoropropane epoxy compounds; A type epoxy resin, hydrogenated bisphenol-F type epoxy resin, hydrogenated bisphenol-S type epoxy resin, hydrogenated 2,2-bis (4-hydroxyphenyl) -1,1,1,3,3,3-hexa Fluoropropane Epoxy Hydrogenated bisphenol-type epoxy compounds such as compounds; Halogenated bisphenol-type epoxy compounds such as brominated bisphenol-A type epoxy resins and brominated bisphenol-F type epoxy resins; Alicyclic diglycidyl such as cyclohex
- An epoxy (meth) acrylate that can be suitably used in the present invention is a bisphenol A type epoxy (meth) acrylate obtained from a bisphenol A type epoxy compound.
- the weight average molecular weight of the epoxy (meth) acrylate is preferably 500 to 10,000.
- the weight ratio of the epoxy (meth) acrylate in the ultraviolet curable adhesive composition of the present invention is usually 1 to 80% by weight, preferably 5 to 30% by weight.
- the content ratio of (meth) acrylate in the ultraviolet curable resin composition of the present invention is 25 to 90% by weight, preferably 40 to 90% by weight, more preferably, based on the total amount of the ultraviolet curable adhesive composition. Is 40 to 80% by weight.
- the (meth) acrylate at least selected from the group consisting of the urethane (meth) acrylate, the (meth) acrylate having a polyisoprene skeleton, and the (meth) acrylate monomer.
- the urethane (meth) acrylate content is 20 to 80% by weight, preferably 30 to 70% by weight, and the (meth) acrylate content rate having the polyisoprene skeleton is 20%. It is more preferable when the content of the (meth) acrylate monomer is 5 to 70% by weight, preferably 10 to 50% by weight.
- the (meth) acrylate contains the urethane (meth) acrylate or the (meth) acrylate having a polyisoprene skeleton, and the content ratio is 20 to 80% by weight, preferably More preferably, it is 30 to 70% by weight and contains a (meth) acrylate monomer, and its content is 5 to 70% by weight, preferably 10 to 50% by weight.
- Examples of the (meth) acrylamide compound that can be used in combination with the ultraviolet curable adhesive composition for a touch panel of the present invention include monofunctional (meth) acrylamides such as acryloylmorpholine and N-isopropyl (meth) acrylamide; And polyfunctional (meth) acrylamides such as acrylamide.
- the content is 25 to 90% by weight, preferably 40 to 90% by weight, and more preferably 40 to 80% by weight, based on the total amount of the ultraviolet curable adhesive composition.
- an acyl phosphine oxide compound for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2, 6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide.
- an uncured portion 2,4,6-trimethylbenzoyldiphenylphosphine oxide is particularly preferable from the viewpoint of the ease of formation of the resin and the transparency of the cured resin layer.
- photopolymerization initiators include 1-hydroxycyclohexyl phenyl ketone (Irgacure 184; manufactured by BASF), 2-hydroxy-2-methyl- [4- (1-methylvinyl) phenyl] propanol oligomer (Esacure ONE; Lambarti 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure 2959; manufactured by BASF), 2-hydroxy-1- ⁇ 4 -[4- (2-Hydroxy-2-methyl-propionyl) -benzyl] -phenyl ⁇ -2-methyl-propan-1-one (Irgacure 127; manufactured by BASF), 2,2-dimethoxy-2-phenylacetophenone (Irgacure 651; manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl Propan-1-one (Darocur 1173; manufactured by BASF), 2-methyl-1- [4-
- these photopolymerization initiators can be used alone or in combination of two or more at any ratio.
- the weight ratio of the photopolymerization initiator in the photocurable resin composition of the present invention is usually 0.2 to 5% by weight, preferably 0.3 to 3% by weight. When it is more than 5% by weight, when obtaining a cured product layer having a cured part and an uncured part on the side opposite to the optical substrate side, the uncured part cannot be formed or the transparency of the resin cured product layer is low. There is a risk of getting worse.
- accelerators such as tertiary amines such as triethanolamine and methyldiethanolamine, and benzoic acid derivatives such as N, N-dimethylaminobenzoic acid ethyl ester and N, N-dimethylaminobenzoic acid isoamyl ester. can do.
- accelerators such as tertiary amines such as triethanolamine and methyldiethanolamine
- benzoic acid derivatives such as N, N-dimethylaminobenzoic acid ethyl ester and N, N-dimethylaminobenzoic acid isoamyl ester.
- an amount of 100% by weight or less is added to the photopolymerization initiator as necessary.
- the ultraviolet curable adhesive composition for a touch panel of the present invention is represented by the following photopolymerization initiation assistant, a general formula (1) described below, as other components.
- the content ratio of the other components with respect to the total amount of the ultraviolet curable adhesive composition of the present invention is a balance obtained by subtracting the total amount of the (meth) acrylate and the photopolymerization initiator from the total amount.
- the total amount of the other components is 0 to 74% by weight, preferably about 5 to 70% by weight, based on the total amount of the ultraviolet curable adhesive composition of the present invention.
- amines that can serve as photopolymerization initiation assistants can be used in combination with the above photopolymerization initiator.
- examples of amines that can be used include benzoic acid 2-dimethylaminoethyl ester, dimethylaminoacetophenone, p-dimethylaminobenzoic acid ethyl ester, and p-dimethylaminobenzoic acid isoamyl ester.
- the photopolymerization initiation assistant such as amines
- the content in the adhesive resin composition of the present invention is usually 0.005 to 5% by weight, preferably 0.01 to 3% by weight.
- the ultraviolet curable adhesive composition for a touch panel of the present invention can contain a compound having a structure represented by the general formula (1) as necessary.
- R 1 and R 2 may be the same or different.
- R 1 and R 2 each have 1 to 18 alkyl groups, alkenyl groups having 1 to 18 carbon atoms, alkynyl groups having 1 to 18 carbon atoms, and aryl groups having 5 to 18 carbon atoms.
- the compound having the structure represented by the general formula (1) can be obtained as, for example, Unisafe PKA-5017 (product name, polyethylene glycol-polypropylene glycol allyl butyl ether) manufactured by NOF Corporation.
- the weight ratio of the compound having the structure represented by the general formula (1) in the ultraviolet curable adhesive composition is usually 10 to 80% by weight, preferably 10 to 70% by weight.
- a softening component (G) can be used as necessary.
- the softening component include polymers or oligomers excluding the (meth) acrylate or the compound having the structure represented by the general formula (1), phthalates, phosphates, glycol esters, Examples thereof include acid esters, aliphatic dibasic acid esters, fatty acid esters, epoxy plasticizers, castor oils, and terpene hydrogenated resins.
- oligomer and polymer examples include an oligomer or a polymer having a polyisoprene skeleton, a polybutadiene skeleton, a polybutene skeleton or a xylene skeleton and an esterified product thereof. In some cases, a polymer or an oligomer having a polybutadiene skeleton and an ester thereof are used. It is preferred to use a compound.
- polystyrene resin examples include butadiene homopolymer, epoxy-modified polybutadiene, butadiene-styrene random copolymer, maleic acid-modified polybutadiene, and terminal hydroxyl group-modified liquid polybutadiene.
- these softening components can be used in combination of two or more of the above components.
- the weight ratio of the softening component in the ultraviolet curable adhesive composition is usually 10 to 80% by weight, preferably 10 to 70% by weight.
- the ultraviolet curable adhesive composition for a touch panel of the present invention includes an antioxidant, an organic solvent, a silane coupling agent, a polymerization inhibitor, a leveling agent, an antistatic agent, a surface lubricant, and a fluorescent brightening agent as necessary.
- Additives such as light stabilizers (for example, hindered amine compounds) and fillers may be added.
- antioxidants include, for example, BHT, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine Pentaerythrityl tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 2,2-thio-diethylenebis [3- (3,5-di-t-butyl- 4-hydroxyphenyl) propionate], triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3-t -Butyl-5-methyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, , N-hexamethylenebis (3,5-di-di
- organic solvent examples include alcohols such as methanol, ethanol and isopropyl alcohol, dimethyl sulfone, dimethyl sulfoxide, tetrahydrofuran, dioxane, toluene, xylene and the like.
- silane coupling agent examples include, for example, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxy) (Cyclohexyl) ethyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyldimethoxysilane, ⁇ -mercapropropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyltrimethoxysilane, 3 -Aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, N- (2- (vinylbenzylamino) ethyl) 3-aminopropyltrimethoxysilane hydrochloride, 3-methacryloxypropyltri
- polymerization inhibitor examples include paramethoxyphenol and methylhydroquinone.
- the light stabilizer include, for example, 1,2,2,6,6-pentamethyl-4-piperidyl alcohol, 2,2,6,6-tetramethyl-4-piperidyl alcohol, 1,2,2, 6,6-pentamethyl-4-piperidyl (meth) acrylate (LA-82, manufactured by ADEKA Corporation), tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3 4-butanetetracarboxylate, tetrakis (2,2,6,6-totramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethylethyl) -2,4,8,10-tetraoxaspiro [5.5] Unde Mixed ester with decanoic acid bis (2,2,6,6-tetramethyl-4-
- the filler include, for example, crystalline silica, fused silica, alumina, zircon, calcium silicate, calcium carbonate, silicon carbide, silicon nitride, boron nitride, zirconia, fosterite, steatite, spinel, titania, talc and the like.
- examples thereof include powder or beads obtained by spheroidizing these.
- the weight ratio of the various additives in the photocurable transparent adhesive composition is 0.01 to 3% by weight, preferably 0.01 to 1% by weight, and more preferably. Is 0.02 to 0.5% by weight.
- the ultraviolet curable adhesive composition for a touch panel of the present invention can be obtained by mixing and dissolving the above-mentioned components at room temperature to 80 ° C. If necessary, impurities may be removed by an operation such as filtration.
- impurities may be removed by an operation such as filtration.
- the adhesive resin composition of the present invention it is preferable to appropriately adjust the blending ratio of the components so that the viscosity at 25 ° C. is in the range of 300 to 15000 mPa ⁇ s in view of applicability.
- the ultraviolet curable adhesive composition for a touch panel of the present invention is used for the purpose of manufacturing a touch panel by bonding at least two optical base materials, at least one of which is an optical base material having a light shielding part.
- the cure shrinkage of the cured product of the ultraviolet curable adhesive composition for a touch panel of the present invention is preferably 3.0% or less, and particularly preferably 2.0% or less.
- the transmittance at 400 nm to 800 nm of the cured product of the ultraviolet curable adhesive composition for a touch panel of the present invention is preferably 90% or more. This is because when the transmittance is less than 90%, it is difficult for light to pass therethrough and the visibility is lowered when used in a display device. Further, when the cured product has a high transmittance at 400 to 450 nm, the visibility can be further improved. Therefore, the transmittance at 400 to 450 nm is preferably 90% or more.
- the ultraviolet curable adhesive composition for a touch panel of the present invention can be suitably used as an adhesive for producing an optical member by laminating a plurality of optical substrates.
- the optical substrate used in the method for producing an optical member of the present invention include a transparent plate, a sheet, a touch panel, and a display unit.
- the “optical substrate” means both an optical substrate having no light shielding part on the surface and an optical substrate having a light shielding part on the surface.
- at least one of the plurality of optical base materials used is an optical base material having a light shielding portion. The position of the light shielding part in the optical substrate having the light shielding part is not particularly limited.
- a band-shaped light shielding portion having a width of 0.05 to 20 mm, preferably about 0.05 to 10 mm, more preferably about 0.1 to 6 mm is formed in the peripheral portion of the optical substrate.
- the light-shielding portion on the optical substrate can be formed by attaching a tape, applying a coating or printing.
- Various materials can be used as the material of the optical substrate used in the present invention. Specifically, resins such as PET, PC, PMMA, a composite of PC and PMMA, glass, COC, COP, plastic (such as acrylic resin), and the like can be given.
- an optical substrate used in the present invention for example, a transparent plate or sheet, a sheet or transparent plate obtained by laminating a plurality of films or sheets such as polarizing plates, a non-laminated sheet or transparent plate, and a transparent made from inorganic glass Plates (inorganic glass plates and processed products thereof, such as lenses, prisms, ITO glass) and the like can be used.
- the optical substrate used in the present invention is a laminate composed of a plurality of functional plates or sheets (hereinafter referred to as “functional laminate”) such as a touch panel (touch panel input sensor) or the following display unit in addition to the polarizing plate described above. Also called “body”).
- Examples of the sheet that can be used as the optical substrate used in the present invention include an icon sheet, a decorative sheet, and a protective sheet.
- Examples of the plate (transparent plate) that can be used in the method for producing an optical member of the present invention include a decorative plate and a protective plate.
- materials for these sheets or plates those listed as materials for transparent plates can be applied.
- Examples of the material of the touch panel surface that can be used as the optical substrate used in the present invention include glass, PET, PC, PMMA, a composite of PC and PMMA, COC, and COP.
- the thickness of a plate-like or sheet-like optical substrate such as a transparent plate or a sheet is not particularly limited, and is usually about 5 ⁇ m to 5 cm, preferably about 10 ⁇ m to 10 mm, more preferably about 50 ⁇ m to 3 mm. Is the thickness.
- a plate-shaped or sheet-shaped transparent optical substrate having a light-shielding portion and the functional laminate are attached with a cured product of the ultraviolet curable adhesive composition for a touch panel of the present invention.
- the combined optical member can be mentioned.
- a display unit such as a liquid crystal display device as one of the optical substrates and using an optical functional material as the other optical substrate, a display unit with an optical functional material (hereinafter also referred to as a display panel). ) Can be manufactured.
- the display unit include display devices such as LCD, EL display, EL illumination, electronic paper, and plasma display in which a polarizing plate is attached to glass.
- the optical functional material include transparent plastic plates such as acrylic plates, PC plates, PET plates, and PEN plates, tempered glass, and touch panel input sensors.
- the refractive index of the cured product is 1.45 to 1.55 in order to improve the visibility because the visibility of the display image is further improved.
- the difference in refractive index from the base material used as the optical base material can be reduced, and the light loss can be reduced by suppressing the irregular reflection of light.
- the optical member including the display unit knit obtained by the manufacturing method of the present invention and the optical base material having the light shielding portion can be incorporated into an electronic device such as a television, a small game machine, a mobile phone, and a personal computer.
- the ultraviolet curable adhesive composition of the present invention is excellent in flexibility, has high moisture resistance, heat resistance, and light resistance, and fills an air gap in a display device such as a liquid crystal display device, an organic EL display device, or a touch panel image display device. Useful for applications such as agents.
- Synthesis example 1 To a reactor equipped with a reflux condenser, a stirrer, a thermometer, and a temperature control device, GI-2000 manufactured by Nippon Soda Co., Ltd. (iodine value: 12.2, hydroxyl value: 46.8 mg ⁇ KOH) as a hydrogenated polybutadiene polyol compound / G) is 569.73 g (0.24 mol), 7.50 g (0.0024 mol) of Exenol 3020 (polypropylene glycol, hydroxyl value: 35.9 mg ⁇ KOH / g) manufactured by Asahi Glass Co., Ltd. as a diol compound is polymerizable.
- GI-2000 manufactured by Nippon Soda Co., Ltd.
- Synthesis example 2 To a reactor equipped with a reflux condenser, a stirrer, a thermometer, and a temperature control device, GI-2000 manufactured by Nippon Soda Co., Ltd. (iodine value: 12.2, hydroxyl value: 46.8 mg ⁇ KOH) as a hydrogenated polybutadiene polyol compound / G) is 545.99 g (0.23 mol), 7.19 g (0.0023 mol) of Exenol 3020 (polypropylene glycol, hydroxyl value: 35.9 mg ⁇ KOH / g) manufactured by Asahi Glass Co., Ltd. as a diol compound is polymerizable.
- GI-2000 manufactured by Nippon Soda Co., Ltd.
- Synthesis example 3 In a reactor equipped with a reflux condenser, a stirrer, a thermometer, and a temperature control device, as a hydrogenated polybutadiene polyol compound, KRASOL HLBH-P 2000 (iodine value: 13.5, hydroxyl value: 0.89 meq / g) manufactured by CRAY VALLEY 511.69 g (0.23 mol), 7.19 g (0.0023 mol) of Exenol 3020 (polypropylene glycol, hydroxyl value: 35.9 mg ⁇ KOH / g) manufactured by Asahi Glass Co., Ltd.
- KRASOL HLBH-P 2000 iodine value: 13.5, hydroxyl value: 0.89 meq / g
- Exenol 3020 polypropylene glycol, hydroxyl value: 35.9 mg ⁇ KOH / g
- Example 1 20 parts by mass of the polyurethane compound (E-1) of Synthesis Example 1, 22 parts by mass of S-1800A (isostearyl acrylate) manufactured by Shin-Nakamura Chemical Co., Ltd., 10 parts by mass of Bremer LA (lauryl acrylate) manufactured by NOF Corporation, 18 parts by mass of Clearon M-105 (aromatically modified hydrogenated terpene resin) manufactured by Yashara Chemical Co., Ltd., 10 parts by mass of LV-100 (polybutene) manufactured by JX Nippon Oil & Energy Corporation, GI-2000 manufactured by Nippon Soda Co., Ltd.
- S-1800A isostearyl acrylate
- Bremer LA laauryl acrylate
- Clearon M-105 aromatically modified hydrogenated terpene resin
- LV-100 polybutene manufactured by JX Nippon Oil & Energy Corporation
- GI-2000 manufactured by Nippon Soda Co., Ltd.
- Example 2 20 parts by mass of the polyurethane compound (E-2) of Synthesis Example 2, 22 parts by mass of S-1800A (isostearyl acrylate) manufactured by Shin-Nakamura Chemical Co., Ltd., 10 parts by mass of Bremer LA (lauryl acrylate) manufactured by NOF Corporation, Yashara Chemical Co., Ltd. Clearon M-105 (aromatically modified hydrogenated terpene resin) 18 parts by mass, JX Nippon Oil & Energy Corporation LV-100 (polybutene) 10 parts by mass, Nippon Soda Co., Ltd.
- S-1800A isostearyl acrylate
- Bremer LA laauryl acrylate
- Clearon M-105 aromatically modified hydrogenated terpene resin
- JX Nippon Oil & Energy Corporation LV-100 polybutene
- GI-2000 (1,2-hydrogenated polybutadiene glycol) 20 parts by mass
- LAMBSON speed cure TPO (2,4,6-trimethylbenzoyldiphenylphosphine oxide) 0.5 parts by mass
- BASF IRGACURE184 (1-hydroxycyclohexylphenyl) Ketone
- PBD (2- (4-Bifeni) manufactured by Wako Pure Chemical Industries Lu) -5- (4-t-butylphenyl) -1,3,4-oxadiazole (0.05 parts by mass) was heated to 70 ° C. and mixed to obtain a resin composition of the present invention.
- the viscosity of the composition was 5000 mPa ⁇ s.
- Example 3 20 parts by mass of the polyurethane compound (E-3) of Synthesis Example 3, 22 parts by mass of S-1800A (isostearyl acrylate) manufactured by Shin-Nakamura Chemical Co., Ltd., 10 parts by mass of Bremer LA (lauryl acrylate) manufactured by NOF Corporation, 18 parts by mass of Clearon M-105 (aromatically modified hydrogenated terpene resin) manufactured by Yashara Chemical Co., Ltd., 10 parts by mass of LV-100 (polybutene) manufactured by JX Nippon Oil & Energy Corporation, GI-2000 manufactured by Nippon Soda Co., Ltd.
- S-1800A isostearyl acrylate
- Bremer LA laauryl acrylate
- Clearon M-105 aromatically modified hydrogenated terpene resin
- LV-100 polybutene manufactured by JX Nippon Oil & Energy Corporation
- GI-2000 manufactured by Nippon Soda Co., Ltd.
- Examples 1 to 3 are shown in Table 1, and the following evaluation was performed.
- the refractive index (25 ° C.) of the resin was measured with an Abbe refractometer (DR-M2: manufactured by Atago Co., Ltd.).
- the ultraviolet curable adhesive composition containing the polyurethane compound of the present invention is useful as a member for optical applications because of its excellent flexibility, weather resistance, light resistance, and transparency. Furthermore, the cured product of the ultraviolet curable adhesive composition of the present invention is useful as an adhesive for bonding a transparent display substrate.
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Abstract
Description
(1)下記に示される化合物(A)と化合物(B)、化合物(C)及び化合物(D)を反応させて得られるポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
化合物(A):水添ポリブタジエンポリオール化合物
化合物(B):ポリイソシアネート化合物
化合物(C):少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物
化合物(D):化合物(A)以外のジオール化合物
(2)水添ポリブタジエンポリオール化合物(A)のヨウ素価が20以下である(1)に記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
(3)ポリイソシアネート化合物(B)が脂肪族系ジイソシアネート化合物である(1)又は(2)に記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
(4)少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物(C)が2-ヒドロキシエチル(メタ)アクリレートである(1)乃至(3)のいずれか一項記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
(5)化合物(A)以外のジオール化合物(D)がポリエーテルポリオールである(1)乃至(4)のいずれか一項記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
(6)(1)乃至(5)のいずれか一項記載のポリウレタン化合物(E)と(E)以外の重合性化合物(F)を含有することを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
(7)重合性化合物(F)がアルキル(メタ)アクリレート又はアルキレン(メタ)アクリレートである(6)記載のタッチパネル用紫外線硬化型接着剤組成物。
(8)ポリウレタン化合物(E)が紫外線硬化型組成物中に5質量%以上含まれることを特徴とする(1)~(7)のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物。
(9)さらに、柔軟化成分(G)を含むことを特徴とする(1)~(8)のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物。
(10)柔軟化成分(G)として、ヒドロキシル基含有ポリマー、テルペン系樹脂のいずれか一方、又はその両方を含むことを特徴とする(9)に記載のタッチパネル用紫外線硬化型接着剤組成物。
(11)(1)~(10)のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物に活性エネルギー線を照射して得られる硬化物。
(12)(1)~(10)のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物を用いてなることを特徴とするタッチパネル。
水酸基価は400以下が好ましく、300以下がより好ましい。下限は特に限定されないが、例えば、0.1以上であればよい。また、(A)の分子量に関しては一般的に入手できる分子量分布のものは全て使用できるが、特に柔軟性と硬化性のバランスをとった場合には重量平均分子量が500~3000のものが特に好ましい。一方、(A)の分子量に関しては一般的に入手できる分子量分布のものは全て使用できるが、特に柔軟性と硬化性のバランスをとった場合には数平均分子量が500~5000のものが好ましく、500~3000のものが特に好ましい。
市販されている水添ポリブタジエンポリオール(A)としては、例えば日本曹達株式会社製:GI-1000、GI-2000、GI-3000、CRAY VALLEY製KRASOL HLBP-H 1000、HLBP-H 2000、HLBP-H 3000等が挙げられる。尚、アルカリ塩を含有するものが好適に使用できる。
また化合物(A)以外のジオール化合物(D)の分子量に関しては一般的に入手できる分子量分布のものは全て使用できるが、特に柔軟性と硬化性のバランスをとった場合には数平均分子量が50~6000のものが好ましく、100~4000のものが特に好ましい。
ここで、得られるポリウレタン化合物(E)において、化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)由来の構造が分散的に取り込まれ、ポリエチレングリコール骨格と水添ポリブタジエン骨格が均一に取り込まれるようにすることで、モノマーとの相溶性を高める観点から、ポリエチレングリコールの数平均分子量は2000以下であることがより好ましく、500以下であることが特に好ましい。
また、ポリウレタン化合物(E)においては、化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)が、水添ポリブタジエンポリオール(A)と化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)との合計モル数からみて、5~10モル%取り込まれていることが好適である。
水酸基価は400以下が好ましく、300以下がより好ましい。下限は特に限定されないが、例えば、5以上であればよい。
また、本発明において使用する水添ポリブタジエンポリオール(A)の数平均分子量については、使用する化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)の数平均分子量より大きいものを組み合わせて使用することが好ましく、化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)の数平均分子量+500の数平均分子量を水添ポリブタジエンポリオール(A)が有することがより好ましく、化合物(A)以外のジオール化合物(D)(特に好ましくはポリエチレングリコール等のポリエーテルポリオール)の数平均分子量+1000の数平均分子量を水添ポリブタジエンポリオール(A)が有することが特に好ましい。
なお、本明細書において「(メタ)アクリレート」とは、メタアクリレート及びアクリレートのいずれか一方又は両者を意味する。「(メタ)アクリル酸」等についても同様である。
ポリイソプレン骨格を有する(メタ)アクリレートの本発明の光硬化型透明接着剤組成物中における重量割合は通常20~80重量%、好ましくは30~70重量%である。
ポリブタジエン骨格を有する(メタ)アクリレートの本発明の光硬化型透明接着剤組成物中における重量割合は通常10~80重量%、好ましくは20~70重量%である。
ここで、(メタ)アクリレートモノマーとは、上記ウレタン(メタ)アクリレート、下記エポキシ(メタ)アクリレート及び上記ポリイソプレン骨格を有する(メタ)アクリレートを除いた(メタ)アクリレートを示す。
一方、ガラスへの密着性を向上させる観点からは、水酸基を有する炭素数1~5のアルキル(メタ)アクリレート、アクリロイルモルホリンが好ましく、アクリロイルモルホリンが特に好ましい。
ここで、(メタ)アクリレートモノマーとは、ウレタン(メタ)アクリレート、エポキシ(メタ)アクリレート、ポリイソプレン骨格を有する(メタ)アクリレートを除いた(メタ)アクリレートを示す。
本発明においては、併用する場合は、硬化収縮を抑えるために、1又は2官能の(メタ)アクリレートを使用することが好ましい。
該紫外線硬化型接着剤組成物における(i)ウレタン(メタ)アクリレート又はポリイソプレン骨格を有する(メタ)アクリレートの少なくとも何れか一方、及び、(ii)(メタ)アクリレートモノマーの両者を含む態様においては、(i)及び(ii)の両者の合計含量が、該樹脂組成物の総量に対して、通常、25~90重量%、40~90重量%、より好ましくは40~80重量%である。
エポキシ(メタ)アクリレートの本発明の紫外線硬化型接着剤組成物中における重量割合は通常1~80重量%、好ましくは5~30重量%である。
本発明の紫外線硬化型接着剤組成物において、(メタ)アクリレートとして、前記ウレタン(メタ)アクリレート、前記ポリイソプレン骨格を有する(メタ)アクリレート及び前記(メタ)アクリレートモノマーからなる群から選択される少なくとも一つを含有することが好ましく、前記ウレタン(メタ)アクリレートの含有割合が20~80重量%、好ましくは30~70重量%であり、前記ポリイソプレン骨格を有する(メタ)アクリレートの含有割合が20~80重量%、好ましくは30~70重量%であり、前記(メタ)アクリレートモノマーの含有割合が5~70重量%、好ましくは10~50重量%であるとき、より好ましい。
本発明の紫外線硬化型接着剤組成物において、(メタ)アクリレートとして、前記ウレタン(メタ)アクリレート又はポリイソプレン骨格を有する(メタ)アクリレートを含有し、その含有割合が20~80重量%、好ましくは30~70重量%であり、且つ、(メタ)アクリレートモノマーを含有し、その含有割合が5~70重量%、好ましくは10~50重量%であるとき、さらに好ましい。
一般式(1)で示される構造を有する化合物を使用する際の紫外線硬化型接着剤組成物中における重量割合は、通常10~80重量%、好ましくは10~70重量%である。
かかる柔軟化成分の紫外線硬化型接着剤組成物中における重量割合は、通常10~80重量%、好ましくは10~70重量%である。
本発明のタッチパネル用紫外線硬化型接着剤組成物の硬化物の硬化収縮率は3.0%以下であることが好ましく、2.0%以下であることが特に好ましい。これにより、紫外線硬化型接着剤組成物が硬化する際に、樹脂硬化物に蓄積される内部応力を低減することができ、基材と紫外線硬化型接着剤組成物の硬化物からなる層との界面に歪みができることを有効に防止することができる。
また、ガラス等の基材が薄い場合には、硬化収縮率が大きい場合には硬化時の反りが大きくなるころから、表示性能に大きな悪影響を及ぼすため、当該観点からも、硬化収縮率は少ない方が好ましい。
また、硬化物の400~450nmでの透過率が高いと視認性の向上が一層期待できることから、400~450nmでの透過率が90%以上であることが好ましい。
本発明の光学部材の製造方法において使用する光学基材としては、透明板、シート、タッチパネル、及び表示体ユニット等を挙げることができる。
本発明において「光学基材」とは、表面に遮光部を有さない光学基材と、表面に遮光部を有する光学基材の両者を意味する。本発明の光学部材の製造においては、好適には複数用いられる光学基材のうち少なくとも一つが、遮光部を有する光学基材である。
上記遮光部を有する光学基材における遮光部の位置は、特に限定されない。好ましい態様としては、該光学基材の周辺部に、幅0.05~20mm、好ましくは0.05~10mm程度、より好ましくは0.1~6mm程度の幅を有する帯状の遮光部が形成される場合が挙げられる。光学基材上の遮光部は、テープの貼り付けや塗料の塗布又は印刷等によって形成することができる。
本発明に用いる光学基材として使用することができるタッチパネル表面の材質としては、ガラス、PET、PC、PMMA、PCとPMMAの複合体、COC、COPが挙げられる。
透明板又はシート等の板状又はシート状の光学基材の厚さは、特に制限されず、通常は、5μm程度から5cm程度、好ましくは10μm程度から10mm程度、より好ましくは50μm~3mm程度の厚さである。
また、光学基材の一つとして液晶表示装置等の表示ユニットを使用し、他の光学基材として光学機能材料を使用することにより、光学機能材料付き表示体ユニット(以下、表示パネルともいう。)を製造することができる。上記の表示ユニットとしては、例えば、ガラスに偏光板を貼り付けてあるLCD、ELディスプレイ、EL照明、電子ペーパーやプラズマディスプレイ等の表示装置が挙げられる。また、光学機能材料としては、アクリル板、PC板、PET板、PEN板等の透明プラスチック板、強化ガラス、タッチパネル入力センサーが挙げられる。
当該屈折率の範囲内であれば、光学基材として使用される基材との屈折率の差を低減させることができ、光の乱反射を抑えて光損失を低減させることが可能となる。
還流冷却器、攪拌機、温度計、温度調節装置を備えた反応器に、水添ポリブタジエンポリオール化合物として日本曹達(株)製GI-2000(ヨウ素価:12.2、水酸基価:46.8mg・KOH/g)を569.73g(0.24mol)、ジオール化合物として旭硝子(株)製エクセノール3020(ポリプロピレングリコール、水酸基価:35.9mg・KOH/g)を7.50g(0.0024mol)、重合性化合物として新中村化学(株)製S-1800A(イソステアリルアクリレート)を171.49g、重合禁止剤として4-メトキシフェノールを0.41gを添加し均一になるまで攪拌し、内部温度を50℃とした。続いてポリイソシアネート化合物としてイソホロンジイソシアネートを80.03g(0.36mol)を添加し80℃で目標のNCO含有量に達するまで反応させた。次に、少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物として大阪有機化学工業(株)製2-ヒドロキシエチルアクリレートを28.70g(0.247mol)、ウレタン化反応触媒としてオクチル酸スズを0.20gを添加し、80℃で反応させ、NCO含有量が0.1%以下となったところを反応の終点とし、ポリウレタン化合物(E-1)を得た。
還流冷却器、攪拌機、温度計、温度調節装置を備えた反応器に、水添ポリブタジエンポリオール化合物として日本曹達(株)製GI-2000(ヨウ素価:12.2、水酸基価:46.8mg・KOH/g)を545.99g(0.23mol)、ジオール化合物として旭硝子(株)製エクセノール3020(ポリプロピレングリコール、水酸基価:35.9mg・KOH/g)を7.19g(0.0023mol)、重合性化合物として新中村化学(株)製S-1800A(イソステアリルアクリレート)を208.51g、重合禁止剤として4-メトキシフェノールを0.37gを添加し均一になるまで攪拌し、内部温度を50℃とした。続いてポリイソシアネート化合物としてイソホロンジイソシアネートを61.35g(0.28mol)を添加し80℃で目標のNCO含有量に達するまで反応させた。次に、少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物として大阪有機化学工業(株)製2-ヒドロキシエチルアクリレートを11.00g(0.095mol)、ウレタン化反応触媒としてオクチル酸スズを0.20gを添加し、80℃で反応させ、NCO含有量が0.1%以下となったところを反応の終点とし、ポリウレタン化合物(E-2)を得た。
還流冷却器、攪拌機、温度計、温度調節装置を備えた反応器に、水添ポリブタジエンポリオール化合物としてCRAY VALLEY製KRASOL HLBH-P 2000(ヨウ素価:13.5、水酸基価:0.89meq/g)を511.69g(0.23mol)、ジオール化合物として旭硝子(株)製エクセノール3020(ポリプロピレングリコール、水酸基価:35.9mg・KOH/g)を7.19g(0.0023mol)、重合性化合物として新中村化学(株)製S-1800A(イソステアリルアクリレート)を197.08g、重合禁止剤として4-メトキシフェノールを0.36gを添加し均一になるまで攪拌し、内部温度を50℃とした。続いてポリイソシアネート化合物としてイソホロンジイソシアネートを61.35g(0.28mol)を添加し80℃で目標のNCO含有量に達するまで反応させた。次に、少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物として大阪有機化学工業(株)製2-ヒドロキシエチルアクリレートを11.00g(0.095mol)、ウレタン化反応触媒としてオクチル酸スズを0.20gを添加し、80℃で反応させ、NCO含有量が0.1%以下となったところを反応の終点とし、ポリウレタン化合物(E-3)を得た。
合成例1のポリウレタン化合物(E-1)20質量部、新中村化学(株)製S-1800A(イソステアリルアクリレート)22質量部、日油(株)製ブレンマーLA(ラウリルアクリレート)10質量部、ヤスハラケミカル(株)製クリアロンM-105(芳香族変性水添テルペン樹脂)18質量部、JX日鉱日石エネルギー(株)製LV-100(ポリブテン)10質量部、日本曹達(株)製GI-2000(1,2-水素化ポリブタジエングリコール)20質量部、LAMBSON社製スピードキュアTPO(2,4,6-トリメチルベンゾイルジフェニルフォスフィンオキサイド)0.5質量部、BASF社製IRGACURE184(1-ヒドロキシシクロヘキシルフェニルケトン)0.5質量部、和光純薬(株)製PBD(2-(4-ビフェニル)-5-(4-t-ブチルフェニル)-1,3,4-オキサジアゾール0.05質量部を70℃に加温、混合し、本発明の樹脂組成物を得た。この樹脂組成物の粘度は3200mPa・sであった。
合成例2のポリウレタン化合物(E-2)20質量部、新中村化学(株)製S-1800A(イソステアリルアクリレート)22質量部、日油(株)製ブレンマーLA(ラウリルアクリレート)10質量部、ヤスハラケミカル(株)製クリアロンM-105(芳香族変性水添テルペン樹脂)18質量部、JX日鉱日石エネルギー(株)製LV-100(ポリブテン)10質量部、日本曹達(株)製GI-2000(1,2-水素化ポリブタジエングリコール)20質量部、LAMBSON社製スピードキュアTPO(2,4,6-トリメチルベンゾイルジフェニルフォスフィンオキサイド)0.5質量部、BASF社製IRGACURE184(1-ヒドロキシシクロヘキシルフェニルケトン)0.5質量部、和光純薬(株)製PBD(2-(4-ビフェニル)-5-(4-t-ブチルフェニル)-1,3,4-オキサジアゾール0.05質量部を70℃に加温、混合し、本発明の樹脂組成物を得た。この樹脂組成物の粘度は5000mPa・sであった。
合成例3のポリウレタン化合物(E-3)20質量部、新中村化学(株)製S-1800A(イソステアリルアクリレート)22質量部、日油(株)製ブレンマーLA(ラウリルアクリレート)10質量部、ヤスハラケミカル(株)製クリアロンM-105(芳香族変性水添テルペン樹脂)18質量部、JX日鉱日石エネルギー(株)製LV-100(ポリブテン)10質量部、日本曹達(株)製GI-2000(1,2-水素化ポリブタジエングリコール)20質量部、LAMBSON社製スピードキュアTPO(2,4,6-トリメチルベンゾイルジフェニルフォスフィンオキサイド)0.5質量部、BASF社製IRGACURE184(1-ヒドロキシシクロヘキシルフェニルケトン)0.5質量部、和光純薬(株)製PBD(2-(4-ビフェニル)-5-(4-t-ブチルフェニル)-1,3,4-オキサジアゾール0.05質量部を70℃に加温、混合し、本発明の樹脂組成物を得た。この樹脂組成物の粘度は5500mPa・sであった。
E型粘度計(TV-200:東機産業(株)製)を用い、25℃にて測定した。
樹脂の屈折率(25℃)をアッベ屈折率計(DR-M2:(株)アタゴ製)で測定した。
フッ素系離型剤を塗布した厚さ1mmのスライドガラス2枚を用意し、そのうち1枚の離型剤塗布面に、得られた紫外線硬化型接着剤組成物を膜厚が200μmとなるよう塗布した。その後、2枚のスライドガラスを、それぞれの離型剤塗布面が互いに向かい合うように貼り合わせた。ガラス越しに高圧水銀灯(80W/cm、オゾンレス)で積算光量3000mJ/cm2の紫外線を該樹脂組成物に照射し、該樹脂組成物を硬化させた。その後、2枚のスライドガラスを剥離し、膜比重測定用の硬化物を作製した。JIS K7112 B法に準拠し、硬化物の比重(DS)を測定した。また、25℃で樹脂組成物の液比重(DL)を測定した。DS及びDLの測定結果から、次式より硬化収縮率を算出したところ、2.5%未満であった。
硬化収縮率(%)=(DS-DL)÷DS×100
離型処理されたPETフィルムを2枚用意し、そのうち1枚の離形面に、得られた紫外線硬化型接着剤組成物を膜厚が200μmとなるように塗布した。その後、2枚のPETフィルムを、それぞれ離型面が互いに向かい合うように貼り合せた。PETフィルム越しに高圧水銀灯(80W/cm、オゾンレス)で積算光量3000mJ/cm2の紫外線を該樹脂組成物に照射し、該樹脂組成物を硬化させた。その後、2枚のPETフィルムを剥離し、剛性率測定用の硬化物を作製した。剛性率はARES(TA Instruments社製)で測定した。
厚さ1mmのスライドガラス2枚を用意し、そのうちの1枚に、得られた紫外線硬化型接着剤組成物を硬化後の膜厚が200μmとなるように塗布した。その後、2枚のスライドガラスを貼り合わせた。ガラス越しに高圧水銀灯(80W/cm、オゾンレス)で積算光量3000mJ/cm2の紫外線照射し、該樹脂組成物を硬化させ、透過率測定用の硬化物を作製した。得られた硬化物の透明性については、分光光度計(U-3310、日立ハイテクノロジーズ(株))を用いて、400~800nm及び400~450nmの波長領域における透過率を測定した。その結果、400~800nmの透過率90%以上であり、かつ、400~450nmの透過率が90%以上であった。
厚さ1mmのスライドガラスと厚さ1mmのガラス板、若しくは片面に偏光フィルムを貼った厚さ1mmのガラス板を用意し、一方に得られた紫外線硬化型接着剤組成物を膜厚が200μmとなるように塗布した後、その塗布面に他方を貼り合わせた。ガラス越しに、高圧水銀灯(80W/cm、オゾンレス)で積算光量3000mJ/cm2の紫外線を該樹脂組成物に照射し、該樹脂組成物を硬化させ、接着性評価用サンプルを作製した。これを用いて、85℃の耐熱試験、60℃90%RHの耐湿試験を行い、100時間放置した。その評価用サンプルにおいて、目視にてガラス又は偏光フィルムからの樹脂硬化物の剥がれを確認したが、剥がれはなかった。
なお、本願は、2014年6月11日付で出願された日本国特許出願(2014-120621)に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。
Claims (12)
- 下記に示される化合物(A)と化合物(B)、化合物(C)及び化合物(D)を反応させて得られるポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
化合物(A):水添ポリブタジエンポリオール化合物
化合物(B):ポリイソシアネート化合物
化合物(C):少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物
化合物(D):化合物(A)以外のジオール化合物 - 水添ポリブタジエンポリオール化合物(A)のヨウ素価が20以下である請求項1に記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
- ポリイソシアネート化合物(B)が脂肪族系ジイソシアネート化合物である請求項1又は2に記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
- 少なくとも1つ以上の水酸基を有する(メタ)アクリレート化合物(C)が2-ヒドロキシエチル(メタ)アクリレートである請求項1乃至3のいずれか一項記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
- 化合物(A)以外のジオール化合物(D)がポリエーテルポリオールである請求項1乃至4のいずれか一項記載のポリウレタン化合物(E)を含むことを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
- 請求項1乃至5のいずれか一項記載のポリウレタン化合物(E)と(E)以外の重合性化合物(F)を含有することを特徴とするタッチパネル用紫外線硬化型接着剤組成物。
- 重合性化合物(F)がアルキル(メタ)アクリレート又はアルキレン(メタ)アクリレートである請求項6記載のタッチパネル用紫外線硬化型接着剤組成物。
- ポリウレタン化合物(E)が紫外線硬化型組成物中に5質量%以上含まれることを特徴とする請求項1~7のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物。
- さらに、柔軟化成分(G)を含むことを特徴とする請求項1~8のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物。
- 柔軟化成分(G)として、ヒドロキシル基含有ポリマー、テルペン系樹脂のいずれか一方、又はその両方を含むことを特徴とする請求項9に記載のタッチパネル用紫外線硬化型接着剤組成物。
- 請求項1~10のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物に活性エネルギー線を照射して得られる硬化物。
- 請求項1~10のいずれか一項に記載のタッチパネル用紫外線硬化型接着剤組成物を用いてなることを特徴とするタッチパネル。
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CN201580031101.8A CN106414647A (zh) | 2014-06-11 | 2015-06-11 | 触控面板用紫外线固化型胶粘剂组合物和物品 |
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