WO2014174936A1 - 紫外線硬化型粘着剤組成物及び粘着剤 - Google Patents
紫外線硬化型粘着剤組成物及び粘着剤 Download PDFInfo
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- WO2014174936A1 WO2014174936A1 PCT/JP2014/057277 JP2014057277W WO2014174936A1 WO 2014174936 A1 WO2014174936 A1 WO 2014174936A1 JP 2014057277 W JP2014057277 W JP 2014057277W WO 2014174936 A1 WO2014174936 A1 WO 2014174936A1
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4808—Mixtures of two or more polyetherdiols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- 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
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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
Definitions
- the present invention relates to an ultraviolet curable pressure-sensitive adhesive composition and a pressure-sensitive adhesive that are excellent in adhesive strength, moisture and heat whitening resistance and moisture and heat yellowing resistance.
- Acrylic adhesives have been used for a wide range of applications.
- applications for IT-related products such as flat-screen TVs are expanding, and high performance and high functionality are being promoted.
- the prices of IT-related products are also falling, and not only high performance but also high productivity is required.
- UV curable adhesive examples include a urethane bond with respect to 100 parts by mass of the monomer having an unsaturated double bond, and an unsaturated double bond at the polymer terminal.
- a pressure-sensitive adhesive composition containing 5 to 200 parts by mass of a high molecular weight polymer having a weight average molecular weight of 20,000 or more is known (see, for example, Patent Document 1).
- the pressure-sensitive adhesive has problems such as whitening of the pressure-sensitive adhesive film and continuous yellowing when left at room temperature after the pressure-sensitive adhesive is used under wet heat conditions.
- the problem to be solved by the present invention is to provide an ultraviolet curable pressure-sensitive adhesive composition which is excellent in adhesive strength, resistance to moist heat whitening and resistance to heat and heat yellowing.
- the inventors of the present invention while pursuing earnest research to solve the above-mentioned problems, paid attention to urethane (meth) acrylate and proceeded with research.
- the present invention is a urethane (meth) obtained by reacting a polyol (a) containing polyethylene glycol (a1), a polyisocyanate (b), and a (meth) acrylic compound (c) having a hydroxyl group or an isocyanate group.
- An ultraviolet curable pressure-sensitive adhesive composition comprising an acrylate (X), a (meth) acrylic monomer (Y), and a photopolymerization initiator (Z), and a pressure-sensitive adhesive obtained using the same It is to provide.
- the pressure-sensitive adhesive obtained by using the ultraviolet curable pressure-sensitive adhesive composition of the present invention has excellent adhesive strength, holding power, wet heat whitening resistance and wet heat yellowing resistance.
- the pressure-sensitive adhesive obtained by using the ultraviolet curable pressure-sensitive adhesive composition of the present invention can be suitably used as a pressure-sensitive adhesive used for an optical member.
- it can be suitably used for manufacturing IT-related products such as a touch panel, a liquid crystal display, a plasma display, an organic EL, a personal computer, and a mobile phone.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention is obtained by reacting a polyol (a) containing polyethylene glycol (a1), a polyisocyanate (b), and a (meth) acrylic compound (c) having a hydroxyl group or an isocyanate group.
- a polyol (a) containing polyethylene glycol (a1), a polyisocyanate (b), and a (meth) acrylic compound (c) having a hydroxyl group or an isocyanate group The resulting urethane (meth) acrylate (X), (meth) acrylic monomer (Y), and photopolymerization initiator (Z) are contained.
- the polyethylene glycol (a1) improves the hydrophilicity of the ultraviolet curable pressure-sensitive adhesive composition, and can absorb moisture and moisture uniformly when the pressure-sensitive adhesive film is exposed under wet heat conditions. This contributes to suppression of whitening of the coating after heat and humidity resistance.
- the amount of the (meth) acrylic monomer that easily yellows can be reduced, or it can be made unusable, so that the adhesive strength is maintained and excellent. Moisture heat yellowing resistance can also be imparted.
- the polyethylene glycol (a1) is used as a raw material for the urethane (meth) acrylate (X).
- a linear one, a branched one, Either may be used, and it may exist as a graft chain or a block chain in the urethane (meth) acrylate (X).
- the number average molecular weight of the polyethylene glycol (a1) is preferably in the range of 200 to 5,000 from the viewpoint of further improving the heat and heat whitening resistance and the heat and heat yellowing resistance, and further the reactivity control during synthesis.
- the range of 200 to 2,000 is more preferable, and the range of 200 to 1,000 is still more preferable from the viewpoint of further improving the ease of storage and storage stability at low temperatures.
- the number average molecular weight of the said polyethylene glycol (a1) shows the value measured on condition of the following by gel permeation chromatography (GPC) method.
- Measuring device High-speed GPC device (“HLC-8220GPC” manufactured by Tosoh Corporation) Column: The following columns manufactured by Tosoh Corporation were connected in series. "TSKgel G5000" (7.8 mm ID x 30 cm) x 1 "TSKgel G4000” (7.8 mm ID x 30 cm) x 1 "TSKgel G3000” (7.8 mm ID x 30 cm) x 1 “TSKgel G2000” (7.8 mm ID ⁇ 30 cm) ⁇ 1 detector: RI (differential refractometer) Column temperature: 40 ° C Eluent: Tetrahydrofuran (THF) Flow rate: 1.0 mL / min Injection amount: 100 ⁇ L (tetrahydrofuran solution with a sample concentration of 0.4 mass%) Standard sample: A calibration curve was prepared using the following standard polystyrene.
- the amount of the polyethylene glycol (a1) used is in the range of 1 to 60% by mass in the polyol (a) from the viewpoint that the adhesive strength, holding power, wet heat whitening resistance and wet heat yellowing resistance can be further improved.
- the range is 3 to 50% by mass, more preferably 5 to 40% by mass, and particularly preferably 10.5 to 33% by mass.
- content of the said polyethyleneglycol (a1) in urethane (meth) acrylate (X) from the point which can improve adhesive force, holding power, wet heat whitening resistance, and wet heat yellowing resistance further, it is 0.1.
- the range is preferably from 50 to 50% by mass, more preferably from 5 to 35% by mass, and still more preferably from 9 to 25% by mass.
- polystyrene resin examples include polyether polyols, polyester polyols, polycarbonate polyols, acrylic polyols, and butadiene polyols other than polyethylene glycol. These polyols may be used alone or in combination of two or more. Among these, it is preferable to use the polyether polyol and the polycarbonate polyol from the viewpoint that adhesive strength, holding power, wet heat whitening resistance and wet heat yellowing resistance can be further improved.
- polyether polyol examples include products obtained by addition polymerization of one or more alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide to a compound having two or more active hydrogens, Use polytetramethylene glycol obtained by ring-opening polymerization of tetrahydrofuran, modified polytetramethylene glycol copolymerized with tetrahydrofuran and alkyl-substituted tetrahydrofuran, modified polytetramethylene glycol copolymerized with neopentyl glycol and tetrahydrofuran, etc. Can do.
- alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide
- a compound having two or more active hydrogens Use polytetramethylene glycol obtained by ring-opening polymerization of tetrahydrofuran, modified polytetramethylene glycol copolymerized with tetrahydrofuran and alkyl-sub
- Examples of the compound having two or more active hydrogens include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, tripropylene glycol, , 2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2, 5-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 2-methyl 1,3-propanediol, neopentylgly
- the number average molecular weight of the polyether polyol is preferably in the range of 200 to 3,000, more preferably in the range of 500 to 2,000, and still more preferably in the range of 500 to 1,500.
- the number average molecular weight of the said polyether polyol shows the value obtained by measuring similarly to the number average molecular weight of the said polyethyleneglycol (a1).
- polycarbonate polyol for example, those obtained by reacting carbonate and / or phosgene with the compound having two or more active hydrogens can be used.
- carbonate ester for example, methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate and the like can be used.
- the hydroxyl value of the polycarbonate polyol is preferably in the range of 30 to 230 mgKOH / g, more preferably in the range of 50 to 230 mgKOH / g, from the viewpoint that the adhesive force can be further improved.
- the hydroxyl value of the polycarbonate polyol is a value measured according to JIS K0070-1992.
- polyisocyanate (b) examples include aromatic diisocyanates such as xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, 4,4 ′.
- aromatic diisocyanates such as xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate
- hexamethylene diisocyanate lysine diisocyanate
- cyclohexane diisocyanate isophorone diisocyanate
- -Diisocyanate having an aliphatic or alicyclic structure such as dicyclohexylmethane diisocyanate, diisocyanate methylcyclohexane, tetramethylxylylene diisocyanate and the like can be used.
- These polyisocyanates may be used alone or in combination of two or more.
- diisocyanates having an alicyclic structure are preferably used from the viewpoint of further improving the adhesive strength, holding power, and heat and heat yellowing resistance.
- the (meth) acrylic compound (c) having a hydroxyl group or an isocyanate group is used for the purpose of introducing a (meth) acryloyl group into the urethane (meth) acrylate (X).
- Examples of the (meth) acrylic compound having a hydroxyl group that can be used as the compound (c) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, (Meth) acrylic acid alkyl ester having a hydroxyl group such as hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl acrylate, hydroxyethyl acrylamide; trimethylolpropane di (meth) acrylate, pentaerythritol tris Polyfunctional (meth) acrylate having a hydroxyl group such as (meth) acrylate, dipentaerythritol penta (meth) acrylate; polyethylene glycol monoacrylate, polypropylene Or the like can be used recall monoacrylate.
- an acrylic compound having a hydroxyl group from the viewpoint of further improving the curability by ultraviolet rays, and from the point that the raw material availability, curability and adhesive properties can be further improved. It is more preferable to use an acrylic acid alkyl ester having the above, and it is particularly preferable to use 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate.
- Examples of the (meth) acrylic compound having an isocyanate group that can be used as the compound (c) include 2- (meth) acryloyloxyethyl isocyanate and 2- (2- (meth) acryloyloxyethyloxy) ethyl.
- Isocyanate, 1,1-bis ((meth) acryloyloxymethyl) ethyl isocyanate, and the like can be used.
- 2- (meth) acryloyloxyethyl isocyanate is preferably used, and 2-acryloyloxyethyl isocyanate is more preferable.
- the said urethane (meth) acrylate (X) in the case of using the (meth) acrylic compound which has a hydroxyl group as the said compound (c), the said polyol (a) and the said (meth) under solvent-free, for example.
- a urethane prepolymer having an isocyanate group is obtained by reacting with (b), and then the (meth) acrylic compound (c) having a hydroxyl group is supplied, mixed, and reacted to be used.
- the reaction is preferably carried out under a condition of 20 to 120 ° C. for about 30 minutes to 24 hours.
- the said polyol (a) and the said polysiloxane are carried out under a non-solvent, for example.
- a method for producing a urethane prepolymer having a hydroxyl group by charging and reacting with isocyanate (b), then supplying the (meth) acrylic compound (c) having an isocyanate group, mixing and reacting, etc. can be used.
- the reaction is preferably carried out under a condition of 20 to 120 ° C. for about 30 minutes to 24 hours.
- the urethane (meth) acrylate (X) may be produced in the presence of an organic solvent or an aqueous medium. Moreover, it may replace with an organic solvent and an aqueous medium, and may manufacture in the presence of the (meth) acryl monomer (Y) mentioned later.
- the reaction of the polyol (a), the polyisocyanate (b), and the (meth) acrylic compound (c) is the sum of the hydroxyl groups of the polyol (a) and the hydroxyl groups of the (meth) acrylic compound (c).
- the reaction may be performed when the equivalent ratio exceeds 1, but in that case, it is preferable to use an alcohol such as methanol for the purpose of deactivating the isocyanate group of the urethane (meth) acrylate (X). .
- an alcohol such as methanol
- the total amount of the hydroxyl group of the polyol (a), the hydroxyl group of the (meth) acrylic compound (dc) and the hydroxyl group of the alcohol, and the equivalent ratio of the polyisocyanate group [isocyanate group / hydroxyl group It is preferable to adjust so that [total amount] is within the above range.
- alcohols that can be used to deactivate the isocyanate group of the urethane (meth) acrylate (X) include monofunctional alcohols such as methanol, ethanol, propanol, and butanol, and 1,2-propylene.
- a bifunctional alcohol composed of primary and secondary hydroxyl groups such as glycol and 1,3-butylene glycol may also be used.
- urethane (meth) acrylate (X) when producing urethane (meth) acrylate (X), a polymerization inhibitor, a urethanization catalyst, or the like may be used as necessary.
- polymerization inhibitor examples include 3,5-bistertiary butyl-4-hydroxytoluene, hydroquinone, methyl hydroquinone, hydroquinone monomethyl ether (methoquinone), para tertiary butyl catechol methoxyphenol, and 2,6-ditertiary butyl cresol.
- Phenothiazine, tetramethylthiuram disulfide, diphenylamine, dinitrobenzene and the like can be used.
- urethanization catalyst examples include nitrogen-containing compounds such as triethylamine, triethylenediamine, N-methylmorpholine, metal salts such as potassium acetate, zinc stearate, tin octylate, dibutyltin laurate, zirconium tetraacetylacetonate, etc. These organometallic compounds can be used.
- the urethane (meth) acrylate (X) has a (meth) acryloyl group that promotes radical polymerization by light irradiation, heating, or the like.
- the equivalent of the (meth) acryloyl group is 1,000 to 200,000 g / eq. From the viewpoint that the adhesive force, the step following ability and the like can be further improved. In the range of 5,000 to 100,000 g / eq. The range of is more preferable.
- the equivalent weight of the (meth) acryloyl group is the total mass of the polyol (a), polyisocyanate (b), and (meth) acryl compound (d) in the urethane (meth) acrylate (X).
- (meth) acrylic compound refers to one or both of a methacrylic compound and an acrylic compound
- (meth) acrylate refers to one or both of methacrylate and acrylate
- Acryloyl group means one or both of methacryloyl group and acryloyl group
- (meth) acrylic acid means one or both of methacrylic acid and acrylic acid
- (meth) acrylic monomer Means one or both of a methacrylic monomer and an acrylic monomer.
- the urethane (meth) acrylate (X) has a weight average molecular weight of 5,000 to 200,000 from the viewpoint of achieving both excellent adhesive strength and holding power and imparting good coating workability.
- the range is preferable, and the range of 10,000 to 100,000 is more preferable.
- the weight average molecular weight of the said urethane (meth) acrylate (X) shows the value obtained by measuring similarly to the number average molecular weight of the said polyethyleneglycol (a1).
- Examples of the (meth) acrylic monomer (Y) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, sec-butyl ( (Meth) acrylate, isobutyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n-pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) Acrylate, nonyl (meth) acrylate, dodecyl (meth) acrylate, 3-methylbutyl (meth) acrylate, isooctyl (meth) acrylate, lauryl (meth) acrylate, tridecy
- the (meth) acrylic monomer (Y) the (meth) acrylic monomer having a nitrogen atom may be used in order to impart excellent moisture and heat whitening resistance.
- the addition amount is preferably small, and is preferably 40% by mass or less based on the total amount of the (meth) acrylic monomer (Y), and 35% by mass. % Or less is more preferable.
- the hydrophilicity of the pressure-sensitive adhesive film can be improved by using the polyethylene glycol (a1), moisture and heat whitening resistance can be expressed with a small addition amount.
- the amount of the (meth) acrylic monomer (Y) used is in the range of 30 to 200 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (X) from the viewpoint of adhesive strength.
- the range of 50 to 150 parts by mass is more preferable, and the range of 70 to 130 parts by mass is particularly preferable.
- the photopolymerization initiator (Z) generates radicals by light irradiation or heating, and initiates radical polymerization of the urethane (meth) acrylate (X) or the (meth) acrylic monomer (Y). is there.
- Examples of the photopolymerization initiator (Z) include 4-phenoxydichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and 1- (4-isopropylphenyl) -2.
- 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1 can be further improved in terms of adhesion, retention, wet heat yellowing resistance and curability. It is preferable to use -hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, or bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide.
- the amount of the photopolymerization initiator (Z) used is preferably in the range of 0.1 to 20 parts by mass, and 0.5 to 15 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (X).
- the range of parts is more preferable, and the range of 1 to 5 parts by weight is particularly preferable.
- the ultraviolet curable adhesive composition of the present invention contains the urethane (meth) acrylate (X), the (meth) acrylic monomer (Y) and the photopolymerization initiator (Z) as essential components. You may contain another additive as needed.
- Examples of the other additives include silane coupling agents, antioxidants, light stabilizers, solvents, rust inhibitors, thixotropic agents, sensitizers, polymerization inhibitors, leveling agents, tackifiers, and antistatic agents.
- An agent, a flame retardant, etc. can be used.
- silane coupling agent examples include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropylmethyl.
- Silane coupling agents having an epoxy group such as dimethoxysilane; 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4- Epoxycyclohexyl) ethylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethylmethyldiethoxysilane, 2- (3,4-epoxycyclohexyl) propyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) propyl Methyldimeth Silane coupling agents having an alicyclic epoxy group such as silane, 2- (3,4-epoxycyclohexyl) propyltriethoxysilane, 2- (3,4-epoxycyclohexyl) propylmethyldiethoxysilane; vinylt
- silane coupling agents may be used alone or in combination of two or more.
- a silane coupling agent having an epoxy group or a silane coupling agent having an alicyclic epoxy group from the viewpoint that the adhesive strength after heat and moisture resistance can be further improved.
- 1 selected from the group consisting of -epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropyltriethoxysilane More preferably, seeds or more are used.
- the amount of the silane coupling agent used is in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (X) because the adhesive strength after heat and moisture resistance can be further improved. In the range of 0.05 to 5 parts by mass, and more preferably in the range of 0.05 to 1 part by mass.
- antioxidants examples include hindered phenol compounds (primary antioxidants) that capture radicals generated by thermal degradation, phosphorus compounds that decompose peroxides generated by thermal degradation, and sulfur compounds (secondary antioxidants). ) Etc. can be used.
- primary antioxidants hindered phenol compounds
- phosphorus compounds that decompose peroxides generated by thermal degradation
- sulfur compounds secondary antioxidants
- hindered phenol compound examples include triethylene glycol-bis- [3- (3-tert-butyl-5-methyl-4hydroxyphenyl) propionate], pentaerythritol tetrakis [3- (3,5-di-).
- sulfur compound examples include didodecyl-3,3′-thiopropionate, dilauryl-3,3′-thiodipropionate, lauryl thiodithionate, ditridecyl-3,3′-thiodipropionate, Dimyristyl-3,3′-thiodipropionate, distearyl-3,3′-thiodipropionate, tetrakis-methylene-3-laurylthiopropionate methane, distearyl-3,3′-methyl-3, 3′-thiodipropionate, laurylstearyl-3,3′-thiodipropionate, bis [2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl] sulfide, ⁇ - Laurylthiopropionate, 2-mercaptobenzimidazole, 2-mercapto-5-methylbenzoy Imidazole, can be used dioct
- one or more antioxidants selected from the group consisting of phosphite and tris (2,4-di-tert-butylphenyl) phosphite, and triphenylphosphine, bis (2,4-diphenyl).
- the amount of the antioxidant used is in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (X) from the viewpoint of further improving wet heat and yellowing resistance. Is preferred.
- the light stabilizer captures radicals generated by photodegradation.
- a radical scavenger such as a thiol compound, a thioether compound, or a hindered amine compound
- an ultraviolet absorber such as a benzophenone compound or a benzoate compound.
- hindered amine compound examples include a reaction product of cyclohexane and N-butyl peroxide 2,2,6,6-tetramethyl-4-piperidineamine-2,4,6-trichloro 1,3,5-triazine.
- the amount of the light stabilizer used is in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (X) from the viewpoint that the heat and heat yellowing resistance can be further improved. Is preferred.
- the viscosity of the ultraviolet curable pressure-sensitive adhesive composition of the present invention is in the range of 500 to 20,000 mPa ⁇ s from the viewpoint of good coating properties and good handling of the pressure-sensitive adhesive solution during coating.
- the range of 1,000 to 15,000 mPa ⁇ s is more preferable.
- the said viscosity shows the value measured with the B-type viscometer at 25 degreeC.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention can be cured by irradiation with energy rays such as ultraviolet rays.
- a predetermined ultraviolet light irradiation apparatus such as a xenon lamp, a xenon-mercury lamp, a metal halide lamp, a high pressure mercury lamp, or a low pressure mercury lamp may be used. It can be cured by irradiating with ultraviolet rays.
- Irradiation of the ultraviolet light preferably be 0.05 ⁇ 5J / cm 2, more preferably 0.1 ⁇ 3J / cm 2, particularly preferably in the range of 0.3 ⁇ 1.5J / cm 2.
- the ultraviolet irradiation amount was based on a value measured in a wavelength range of 300 to 390 nm using a UV checker UVR-N1 (manufactured by GS Yuasa Co., Ltd.).
- Examples of the substrate on which the ultraviolet curable pressure-sensitive adhesive composition of the present invention can be applied to form a pressure-sensitive adhesive layer include a plastic substrate, a flexible print substrate, a glass substrate, and a substrate obtained by depositing ITO on these substrates. A material etc. can be used.
- plastic substrate examples include a commonly used acrylic resin and the like, PC (polycarbonate), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), modified PPE (polyphenylene ether), PET (polyethylene terephthalate), COP (cycloolefin polymer), TAC (triacetyl cellulose), an antireflection film, an antifouling film, a transparent conductive film constituting a touch panel, and the like can be used.
- PC polycarbonate
- PBT polybutylene terephthalate
- PPS polyphenylene sulfide
- modified PPE polyphenylene ether
- PET polyethylene terephthalate
- COP cycloolefin polymer
- TAC triacetyl cellulose
- IPDI isophorone diisocyanate
- 0.1 part by mass of dioctyltin dineodecanate was added, and the temperature was raised to 80 ° C. over 1 hour. Thereafter, it was held at 80 ° C. for 12 hours, and after confirming that all isocyanate groups had disappeared, it was cooled to obtain urethane acrylate (X-1).
- the obtained urethane acrylate (X-1) has an acryloyl group equivalent of 10,441 (rounded off after the decimal point.
- the molecular weight of 2-hydroxyethyl acrylate is 116.1. The same applies hereinafter), and the weight average molecular weight is 30. 000.
- urethane acrylate (X-2) After raising the temperature in the reaction vessel to 40 ° C., 102 parts by mass of IPDI was added. Therefore, 0.1 part by mass of dioctyltin dineodecanate was added, and the temperature was raised to 80 ° C. over 1 hour. Thereafter, it was held at 80 ° C. for 12 hours, and after confirming that all isocyanate groups had disappeared, it was cooled to obtain urethane acrylate (X-2).
- the obtained urethane acrylate (X-2) had an acryloyl group equivalent of 7,023 and a weight average molecular weight of 19,000.
- urethane acrylate (X-3) had an acryloyl group equivalent of 10,431 and a weight average molecular weight of 21,000.
- urethane acrylate (X-4) had an acryloyl group equivalent of 10,507 and a weight average molecular weight of 26,000.
- urethane acrylate (X-5) had an acryloyl group equivalent of 9,771 and a weight average molecular weight of 20,000.
- urethane acrylate (X-6) had an acryloyl group equivalent of 6,985 and a weight average molecular weight of 19,000.
- urethane acrylate (X-7) had an acryloyl group equivalent of 10,208 and a weight average molecular weight of 22,000.
- Example 1 ⁇ Preparation of UV-curable adhesive composition>
- X-1 urethane acrylate
- BA butyl acrylate
- DMAA dimethylacrylamide
- Examples 2-6, Comparative Examples 1-2 An ultraviolet curable pressure-sensitive adhesive composition was obtained in the same manner as in Example 1 except that the type and amount of urethane (meth) acrylate and (meth) acrylic monomer used were changed as shown in Table 1.
- UV curable adhesive fats obtained in Examples and Comparative Examples so that the film thickness after UV irradiation is 175 ⁇ m on the surface of a 50 ⁇ m-thick polyethylene terephthalate film (mold-release PET 50) whose surface has been subjected to mold release treatment
- the composition was applied, and release PET50 was bonded.
- UV irradiation was performed with a UV irradiation apparatus so that the integrated light quantity of the wavelength in the UV-A region after passing through the release PET 50 was 1 J / cm 2 , thereby producing an adhesive film.
- the haze (%) of the test piece was measured with a turbidimeter “NDH5000” (manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS K7361-1-1997, and this value was used as an initial value.
- the test piece was left for 10 minutes in an atmosphere of 85 ° C. and 85% humidity and then taken out, and the haze (%) was taken within 10 minutes after taking out the turbidimeter “NDH5000” (manufactured by Nippon Denshoku Industries Co., Ltd.). ) In accordance with JISK7361-1-1997.
- a test piece was prepared by sticking one side of the pressure-sensitive adhesive film prepared by the above-described method to a glass plate and further peeling off another release PET50.
- the yellowing degree (b *) of the test piece was measured according to JISK7105-1981 using a light source C, a visual field of 2 °, and a spectrocolorimeter “CM-5000d” (manufactured by Konica Minolta Sensing Co., Ltd.). Further, after the test piece was allowed to stand for 500 hours in an atmosphere of 80 ° C. and 85% humidity, the degree of yellowing (b *) was measured in the same manner.
- the pressure-sensitive adhesive obtained using the ultraviolet curable pressure-sensitive adhesive composition of the present invention is excellent in adhesive strength, heat-and-moisture whitening resistance, and heat-and-heat yellowing resistance.
- Comparative Example 1 is an embodiment in which polyethylene glycol is not used as a raw material for urethane (meth) acrylate, but it was found that the heat-and-moisture whitening resistance was poor.
- Comparative Example 2 is an embodiment in which polyethylene glycol is not used as a raw material for urethane (meth) acrylate, and a large amount of yellowish ACMO is used as a (meth) acrylic monomer, but the heat and heat yellowing resistance is poor. It turns out that.
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Abstract
Description
カラム:東ソー株式会社製の下記のカラムを直列に接続して使用した。
「TSKgel G5000」(7.8mmI.D.×30cm)×1本
「TSKgel G4000」(7.8mmI.D.×30cm)×1本
「TSKgel G3000」(7.8mmI.D.×30cm)×1本
「TSKgel G2000」(7.8mmI.D.×30cm)×1本
検出器:RI(示差屈折計)
カラム温度:40℃
溶離液:テトラヒドロフラン(THF)
流速:1.0mL/分
注入量:100μL(試料濃度0.4質量%のテトラヒドロフラン溶液)
標準試料:下記の標準ポリスチレンを用いて検量線を作成した。
東ソー株式会社製「TSKgel 標準ポリスチレン A-500」
東ソー株式会社製「TSKgel 標準ポリスチレン A-1000」
東ソー株式会社製「TSKgel 標準ポリスチレン A-2500」
東ソー株式会社製「TSKgel 標準ポリスチレン A-5000」
東ソー株式会社製「TSKgel 標準ポリスチレン F-1」
東ソー株式会社製「TSKgel 標準ポリスチレン F-2」
東ソー株式会社製「TSKgel 標準ポリスチレン F-4」
東ソー株式会社製「TSKgel 標準ポリスチレン F-10」
東ソー株式会社製「TSKgel 標準ポリスチレン F-20」
東ソー株式会社製「TSKgel 標準ポリスチレン F-40」
東ソー株式会社製「TSKgel 標準ポリスチレン F-80」
東ソー株式会社製「TSKgel 標準ポリスチレン F-128」
東ソー株式会社製「TSKgel 標準ポリスチレン F-288」
東ソー株式会社製「TSKgel 標準ポリスチレン F-550」
<ウレタンアクリレート(X-1)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、ポリテトラメチレングリコール(数平均分子量;1,000、以下「PTMG1000」と略記する。)を410質量部、ポリエチレングリコール(数平均分子量;400、以下「PEG-1」と略記する。)を27.5質量部、2-ヒドロキシエチルアクリレート(以下、「HEA」と略記する。)6.1質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、イソホロンジイソシアネート(以下、「IPDI」と略記する。)105質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-1)を得た。得られたウレタンアクリレート(X-1)は、アクリロイル基の当量が10,441(小数点以下四捨五入。2-ヒドロキシエチルアクリレートの分子量は116.1とした。以下、同じ。)、重量平均分子量が30,000であった。
<ウレタンアクリレート(X-2)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、ポリカーボネートポリオール(「デュラノールT-5651」旭化成ケミカルズ株式会社製、数平均分子量;1000)390質量部、ポリエチレングリコール(数平均分子量;600、以下「PEG-2」と略記する。)を43.4質量部、HEA9質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを102質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-2)を得た。得られたウレタンアクリレート(X-2)は、アクリロイル基の当量が7,023、重量平均分子量が19,000であった。
<ウレタンアクリレート(X-3)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、PTMG1000を351質量部、PEG-1を51.4質量部、HEAを5.7質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを104質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-3)を得た。得られたウレタンアクリレート(X-3)は、アクリロイル基の当量が10,431、重量平均分子量が21,000であった。
<ウレタンアクリレート(X-4)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、ポリプロピレングリコール(数平均分子量;3,000、以下、「PPG3000」と略記する。)を180質量部、PTMG1000を143質量部、PEG-1を109質量部、HEAを6量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを105質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-4)を得た。得られたウレタンアクリレート(X-4)は、アクリロイル基の当量が10,507、重量平均分子量が26,000であった。
<ウレタンアクリレート(X-5)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、デュラノールT-5652を442質量部、ポリエチレングリコール(「Ymer N120」Perstorp社製、数平均分子量;1,000)を246質量部、HEAを9.5質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを102質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-5)を得た。得られたウレタンアクリレート(X-5)は、アクリロイル基の当量が9,771、重量平均分子量が20,000であった。
<ウレタンアクリレート(X-6)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、デュラノールT-5651を467質量部、HEAを9.6質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを101質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-6)を得た。得られたウレタンアクリレート(X-6)は、アクリロイル基の当量が6,985、重量平均分子量が19,000であった。
<ウレタンアクリレート(X-7)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、PTMG1000を460質量部、HEAを6.5質量部、2,6-ジ-ターシャリーブチル-クレゾールを2質量部、p-メトキシフェノール0.3質量部を添加した。反応容器内温度が40℃になるまで昇温した後、IPDIを105質量部添加した。そこで、ジオクチルスズジネオデカネート0.1質量部添加し、1時間かけて80℃まで昇温した。その後、80℃で12時間ホールドし、全てのイソシアネート基が消失していることを確認後、冷却しウレタンアクリレート(X-7)を得た。得られたウレタンアクリレート(X-7)は、アクリロイル基の当量が10,208、重量平均分子量が22,000であった。
<紫外線硬化型粘着剤組成物の調製>
攪拌機、還流冷却管、温度計を備えた反応容器に、前記ウレタンアクリレート(X-1)100質量部、ブチルアクリレート(以下、「BA」と略記する。)105質量部、ジメチルアクリルアミド(以下、「DMAA」と略記する。)10質量部を投入し、80℃で均一になるまで撹拌した。その後、室温まで冷却し、撹拌下で2,4,6-トリメチルベンゾイルフェニルフォスフィンオキサイド3質量部、デカン二酸ビス(2,2,6,6-テトラメチル-1-(オクチルオキシ)-4-ピペリジニル)エステル0.5質量部、トリフェニルホスフィン0.5質量部、3-グリシドキシプロピルトリエトキシシラン0.1質量部を添加し、均一になるまで撹拌した。その後、200メッシュ金網で濾過し、紫外線硬化型粘着剤組成物を得た。
用いるウレタン(メタ)アクリレート、(メタ)アクリル単量体の種類及び量を表1に示す通りに変更した以外は、実施例1と同様にして紫外線硬化型粘着剤組成物を得た。
表面に離型処理された厚さ50μmのポリエチレンテレフタレートフィルム(離型PET50)の表面に、UV照射後における膜厚が175μmとなるように実施例及び比較例で得られた紫外線硬化型粘着剤脂組成物を塗布し、離型PET50を貼り合せた。その後、UV照射装置にて、離型PET50透過後のUV-A領域の波長の積算光量が1J/cm2となるようにUV照射し、粘着フィルムを作製した。
前述の方法で作成した粘着フィルムの片面を、厚さ75μmのポリエチレンテレフタレートフィルム(PET75)に貼り合せ、片面にPET75基材が貼り合された粘着フィルムを作成した。これを25mm幅に切ったものを試験片とした。該試験片を2kgロール×2往復で被着体であるガラス板、ポリカーボネート(PC)板にそれぞれ貼り付けた。貼り付け1時間後に23℃、湿度50%の雰囲気下で180度剥離強度を測定し、粘着力とした。
前述の方法で作成した粘着フィルムの片面を、厚さ100μmのポリエチレンテレフタレートフィルム(PET100)に貼り合せ、片面にPET100基材が貼り合された粘着フィルムを作製した。これを縦50mm、横40mmに切り、ガラス板に2kgロール×2往復で貼り付けたものを試験片とした。その試験片を、濁度計「NDH5000」(日本電色工業(株)製)にて、JISK7361-1-1997に準じてヘイズ(%)を測定し、この値を初期値とした。次に、この試験片を85℃、湿度85%の囲気下に10分放置した後取り出し、取り出し後10分以内にヘイズ(%)を濁度計「NDH5000」(日本電色工業(株)製)にて、JISK7361-1-1997に準じて測定した。
前述の方法で作成した粘着フィルムの片面をガラス板に貼り付け、更にもう1枚の離型PET50を剥離したものを試験片とした。その試験片を、光源C、視野2°、分光測色計「CM-5000d」(コニカミノルタセンシング株式会社製)にて、JISK7105-1981に準じて黄変度(b*)を測定した。また、前記試験片を80℃、湿度85%の雰囲気下で500時間放置した後に、同様に黄変度(b*)を測定した。
ACMO;アクリロイルモルフォリン
NOA;n-オクチルアクリレート
IOA;イソオクチルアクリレート
TDA;トリデシルアクリレート
CHA;シクロヘキシルアクリレート
IBXA;イソボルニルアクリレート
Claims (5)
- ポリエチレングリコール(a1)を含むポリオール(a)、ポリイソシアネート(b)、及び、水酸基又はイソシアネート基を有する(メタ)アクリル化合物(c)を反応させて得られるウレタン(メタ)アクリレート(X)、(メタ)アクリル単量体(Y)、及び光重合開始剤(Z)を含有することを特徴とする紫外線硬化型粘着剤組成物。
- 前記ポリエチレングリコール(a1)の数平均分子量が200~5,000の範囲である請求項1記載の紫外線硬化型粘着剤組成物。
- 前記ポリエチレングリコール(a1)の使用量が前記ポリオール(a)中1~60質量%の範囲である請求項1記載の紫外線硬化型粘着剤組成物。
- 前記(メタ)アクリル単量体(Y)中における窒素原子を有する(メタ)アクリル単量体の含有量が40質量%以下である請求項1記載の紫外線硬化型粘着剤組成物。
- 請求項1~4のいずれか1項記載の紫外線硬化型粘着剤組成物を用いて得られたことを特徴とする粘着剤。
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| WO2015098307A1 (ja) * | 2013-12-25 | 2015-07-02 | Dic株式会社 | 紫外線硬化型粘着剤組成物、粘着フィルム、及び、粘着フィルムの製造方法 |
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| JP2016199617A (ja) * | 2015-04-07 | 2016-12-01 | 日本合成化学工業株式会社 | 光硬化性組成物 |
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| JP2019157091A (ja) * | 2018-03-16 | 2019-09-19 | 三菱ケミカル株式会社 | 活性エネルギー線硬化性樹脂組成物、およびそれを用いたコーティング剤、ならびにシート |
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| JP2019157091A (ja) * | 2018-03-16 | 2019-09-19 | 三菱ケミカル株式会社 | 活性エネルギー線硬化性樹脂組成物、およびそれを用いたコーティング剤、ならびにシート |
| JP7073814B2 (ja) | 2018-03-16 | 2022-05-24 | 三菱ケミカル株式会社 | 活性エネルギー線硬化性樹脂組成物、およびそれを用いたコーティング剤、ならびにシート |
Also Published As
| Publication number | Publication date |
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| CN105143388A (zh) | 2015-12-09 |
| KR101719536B1 (ko) | 2017-03-24 |
| TWI636110B (zh) | 2018-09-21 |
| JP5641382B1 (ja) | 2014-12-17 |
| KR20150119027A (ko) | 2015-10-23 |
| TW201446918A (zh) | 2014-12-16 |
| CN105143388B (zh) | 2016-11-09 |
| JPWO2014174936A1 (ja) | 2017-02-23 |
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