WO2016002666A1 - 活性エネルギー線硬化性粘着剤組成物、粘着剤及び粘着シート - Google Patents
活性エネルギー線硬化性粘着剤組成物、粘着剤及び粘着シート Download PDFInfo
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- WO2016002666A1 WO2016002666A1 PCT/JP2015/068550 JP2015068550W WO2016002666A1 WO 2016002666 A1 WO2016002666 A1 WO 2016002666A1 JP 2015068550 W JP2015068550 W JP 2015068550W WO 2016002666 A1 WO2016002666 A1 WO 2016002666A1
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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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
- C08G18/67—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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- 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
- C08G18/69—Polymers of conjugated dienes
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- 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
- C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
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- 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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- 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
- C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- 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
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- 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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- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- C09J7/00—Adhesives in the form of films or foils
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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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
- C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
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- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
- C08F222/106—Esters of polycondensation macromers
- C08F222/1065—Esters of polycondensation macromers of alcohol terminated (poly)urethanes, e.g. urethane(meth)acrylates
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- C08G2170/00—Compositions for adhesives
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C09J2475/00—Presence of polyurethane
Definitions
- the present invention relates to an active energy ray-curable pressure-sensitive adhesive composition, a pressure-sensitive adhesive, and a pressure-sensitive adhesive sheet, and more particularly, exhibits excellent releasability even when exposed to a high temperature environment when used in a pressure-sensitive adhesive for a protective film.
- the present invention relates to a pressure-sensitive adhesive composition that forms a pressure-sensitive adhesive, a pressure-sensitive adhesive using the same, and a pressure-sensitive adhesive sheet.
- adhesives such as strong adhesives for the purpose of firmly bonding adherends for a long period of time, and peel-off type adhesives that are supposed to be peeled off from adherends after being attached.
- strong adhesives for the purpose of firmly bonding adherends for a long period of time
- peel-off type adhesives that are supposed to be peeled off from adherends after being attached.
- types, and the most suitable adhesive is designed and used for each field.
- urethane (meta) obtained by reacting a hydroxyl group-containing (meth) acrylate (a3) with a terminal isocyanate group-containing compound of a reaction product of a hydrogenated polybutadiene polyol (a1) and a polyisocyanate (a2).
- An active energy ray-curable pressure-sensitive adhesive comprising an acrylate compound [A] and an aliphatic or alicyclic alkyl acrylate [B] having 6 or more carbon atoms; It has been proposed that it has an excellent balance of weather resistance and is useful as an adhesive used for various protective films (see, for example, Patent Document 1).
- Patent Document 1 has a low elastic modulus in the high-temperature region of the pressure-sensitive adhesive layer and a high glass transition temperature of the pressure-sensitive adhesive layer.
- the protective film adheresive layer
- the peelability from the adherend is lowered, and there is still room for improvement.
- an adhesive composition that forms an adhesive exhibiting excellent peelability even when exposed to a high temperature environment when used as an adhesive for a protective film, and further an adhesive. It aims at providing an agent and an adhesive sheet.
- the active energy ray-curable pressure-sensitive adhesive composition containing a urethane (meth) acrylate compound and an ethylenically unsaturated monomer
- a compound obtained by reacting a polybutadiene polyol as the urethane (meth) acrylate compound is used.
- the polybutadiene-based polyol contains a polybutadiene structure obtained by bonding 1,4 bonds of butadiene more than usual.
- the present invention was completed by finding that a pressure-sensitive adhesive exhibiting excellent peelability can be obtained even when exposed.
- a butadiene-based polyol having many polybutadiene structures obtained by bonding 1,2 of butadiene is used as the polybutadiene-based polyol.
- it has excellent adhesive strength and adhesion, it has relatively low crystallinity, so when exposed to a high temperature environment, the peelability from the adherend is reduced and adhesive residue is generated.
- the gist of the present invention is a urethane (meth) acrylate compound (A) obtained by reacting a polybutadiene polyol (a1), a polyvalent isocyanate compound (a2), and a hydroxyl group-containing (meth) acrylate compound (a3). And an ethylenically unsaturated monomer (B) (excluding (A)), and an active energy ray-curable pressure-sensitive adhesive composition, which is obtained by curing the composition by irradiation with active energy rays. Active energy ray-curable pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive layer has a storage elastic modulus at 23 ° C.
- the gist of the present invention is a urethane (meth) acrylate compound (A) obtained by reacting a polybutadiene polyol (a1), a polyvalent isocyanate compound (a2), and a hydroxyl group-containing (meth) acrylate compound (a3). , And an ethylenically unsaturated monomer (B) (excluding (A)), an active energy ray-curable pressure-sensitive adhesive composition, wherein the polybutadiene-based polyol (a1) contains 1,4 butadiene.
- the present invention also relates to an active energy ray-curable pressure-sensitive adhesive composition which is a polybutadiene-based polyol containing 15 mol% or more of a polybutadiene structure obtained by bonding.
- the present invention also provides a pressure-sensitive adhesive obtained by curing the pressure-sensitive adhesive composition, and a pressure-sensitive adhesive sheet using the same.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention can form a pressure-sensitive adhesive having excellent peelability when used as a pressure-sensitive adhesive for a protective film, and a pressure-sensitive adhesive using the same.
- the adhesive sheet is an active energy ray-curable adhesive composition that can be used for bonding an optical display or a touch sensor, and an optical display or touch panel that is bonded using the adhesive sheet, and a solar battery back sheet.
- Organic EL display sealing applications food packaging applications, gas barrier film applications and the like.
- (meth) acrylic acid is acrylic acid or methacrylic acid
- (meth) acryl is acrylic or methacrylic
- (meth) acryloyl is acryloyl or methacryloyl
- (meth) acrylate is acrylate or Each means methacrylate.
- the acrylic resin is a resin obtained by polymerizing a polymerization component containing at least one (meth) acrylate monomer.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention contains a urethane (meth) acrylate-based compound (A) and an ethylenically unsaturated monomer (B), and is further irradiated with active energy rays.
- the pressure-sensitive adhesive composition has a storage elastic modulus at 23 ° C. of 1.0 ⁇ 10 6 or more and a glass transition temperature of the pressure-sensitive adhesive layer of ⁇ 30 ° C. or lower.
- the storage elastic modulus corresponds to the real part of the sinusoidal force applied to the sample and the distortion generated when the force is applied on the complex plane. This is an apparent element that can be detected and is a value representing the hardness of the sample, and is measured as follows.
- the active energy ray-curable pressure-sensitive adhesive composition was applied to a release polyethylene terephthalate (PET) film (thickness 50 ⁇ m) using an applicator so as to have a film thickness of 175 ⁇ m, and a tabletop UV irradiation apparatus (manufactured by Iwasaki Electric Co., Ltd., “Conveyor”). UV irradiation under conditions of 80 W / cm (high pressure mercury lamp) ⁇ 18 cmH ⁇ 2.04 m / min ⁇ 3 Pass (integrated 2,400 mJ / cm 2 ) with a tabletop irradiation apparatus ”) and cured to form an adhesive sheet .
- PTT polyethylene terephthalate
- the pressure-sensitive adhesive sheet was cut into a length of 20 mm and a width of 3 mm to form a test piece.
- the test piece was heated at a frequency of 1 Hz using a tensile mode of a dynamic viscoelasticity measuring device “DVA-225” manufactured by IT Measurement Control Co., Ltd.
- DVA-225 dynamic viscoelasticity measuring device manufactured by IT Measurement Control Co., Ltd.
- the real part of the complex elastic modulus obtained by measurement under conditions of a rate of 3 ° C./min and a strain of 0.1% is defined as the storage elastic modulus of the present invention.
- the glass transition temperature is a temperature at which a glass transition occurs in the polymer material (a temperature at which the supercooled state changes to the glass state), and is measured as follows.
- the ratio (tan ⁇ ) of the imaginary part (loss elastic modulus) to the real part (storage elastic modulus) of the complex elastic modulus obtained by the storage elastic modulus measurement is determined, and the maximum peak temperature of tan ⁇ is defined as the glass transition temperature (° C.). To do.
- the urethane (meth) acrylate compound (A) used in the present invention is obtained by reacting a polybutadiene polyol (a1), a polyvalent isocyanate compound (a2), and a hydroxyl group-containing (meth) acrylate compound (a3). It is.
- the polybutadiene-based polyol (a1) in the present invention is a polybutadiene structure obtained by polymerizing butadiene in the molecule and a polybutadiene polyol having two or more hydroxyl groups, and an ethylenically unsaturated group contained in the polybutadiene polyol. It contains a hydrogenated polybutadiene polyol that is fully or partially hydrogenated.
- the polybutadiene structure includes a polybutadiene structure in which 1,3-butadiene is bonded to trans 1,4, a polybutadiene structure in which 1,3-butadiene is cis 1,4 bonded, and a polybutadiene structure in which 1,3-butadiene is bonded to 1,2. Any may be sufficient and the polybutadiene structure in which these bonds were mixed may be sufficient.
- a polybutadiene structure in which 1,3-butadiene is trans and cis 1,4 bonded in an amount of 15 mol% or more, particularly preferably 15 to 50 mol%, and more preferably The amount is preferably 20 to 45 mol%, particularly preferably 25 to 40 mol%. If the content ratio of the 1,4-butadiene-bonded polybutadiene structure is too small, the storage elastic modulus of the pressure-sensitive adhesive layer tends to decrease, and if it is too large, the crystallinity of the pressure-sensitive adhesive layer increases, There exists a tendency for the adhesiveness with a body to fall.
- polybutadiene polyol examples include products manufactured by Nippon Soda Co., Ltd., trade names “NISSO-PB G-1000”, “NISSO-PB G-2000”, “NISSO-PB G-3000”; Names such as “Poly bd R-45HT”, “Poly bd R-15HT”; manufactured by CRAYVALLEY; trade names “Krasol LBH-P2000”, “Krasol LBH-P3000”, and the like.
- Examples of the hydrogenated polybutadiene polyol include, for example, trade names “NISSO-PB GI-1000”, “NISSO-PB GI-2000”, “NISSO-PB GI-3000” manufactured by Nippon Soda Co., Ltd .; Names include “Krasol HLBH-P2000”, “Krazol HLBH-P3000”, and the like.
- the hydrogenation rate of the hydrogenated polybutadiene polyol is preferably 90% or more, particularly preferably 93% or more, and further preferably 95% or more. If the hydrogenation rate is too low, the storage stability tends to decrease.
- polybutadiene-based polyol (a1) a hydrogenated polybutadiene polyol is preferable in terms of excellent storage stability.
- the number average molecular weight of the polybutadiene-based polyol (a1) is preferably 300 to 10,000, particularly preferably 500 to 8,000, and more preferably 1,000 to 6,000. If the number average molecular weight is too high, the viscosity tends to be high and workability tends to be lowered. If the number average molecular weight is too low, sufficient adhesive strength tends to be difficult to obtain.
- said number average molecular weight is the value calculated
- the number of functional groups (F) represents the number of hydroxyl groups contained in one molecule.
- the hydroxyl value of the polybutadiene-based polyol (a1) is preferably 10 to 400 mgKOH / g, particularly preferably 20 to 300 mgKOH / g, and further preferably 30 to 250 mgKOH / g. If the hydroxyl value is too high, the urethane (meth) acrylate compound tends to have a low molecular weight and the adhesive strength tends to decrease, and if too low, the viscosity tends to increase and the workability tends to decrease.
- the hydroxyl value can be measured based on JIS K 0070-1992.
- polyvalent isocyanate compound (a2) examples include aromatics such as tolylene diisocyanate, diphenylmethane diisocyanate, polyphenylmethane polyisocyanate, modified diphenylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, phenylene diisocyanate, and naphthalene diisocyanate.
- Aliphatic polyisocyanates such as polyisocyanates, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, lysine triisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, Alicyclic polyisocyanates such as 1,3-bis (isocyanatomethyl) cyclohexane, trimer compounds or multimeric compounds of these polyisocyanates, allophanate polyisocyanates, burette polyisocyanates, water-dispersed polyisocyanates, etc. Can be mentioned.
- diisocyanate compounds are preferable from the viewpoint of stability during the urethanization reaction, and in particular, aliphatic diisocyanates such as pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, and hydrogenated diphenylmethane diisocyanate.
- aliphatic diisocyanates such as pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, and hydrogenated diphenylmethane diisocyanate.
- cycloaliphatic diisocyanates such as hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, and 1,3-bis (isocyanatomethyl) cyclohexane are preferably used. Hydrogenation is preferred because of excellent reactivity and versatility
- Examples of the hydroxyl group-containing (meth) acrylate compound (a3) include: Carbon of alkyl group such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, etc.
- Hydroxyalkyl (meth) acrylates having a number of 2 to 20 (preferably 2 to 18); Dipropylene glycol (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polyethylene glycol-polypropylene glycol mono (meth) acrylate, poly (ethylene glycol-tetramethylene glycol) mono (meth) acrylate, Hydroxyl group-containing polyoxyalkylene mono (meth) acrylates such as poly (propylene glycol-tetramethylene glycol) mono (meth) acrylate; 2-hydroxyethylacryloyl phosphate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, caprolactone-modified 2-hydroxyethyl (meth) acrylate, fatty acid-modified glycidyl (meth) acrylate, 2-hydroxy-3- ( (Meth) acrylate compounds containing one
- a (meth) acrylate compound containing one ethylenically unsaturated group ethylenically unsaturated group is preferred. It is particularly preferable to use a polyoxyalkylene mono (meth) acrylate that is contained, and a compound represented by the following general formula (1) is more preferable.
- R represents a hydrogen atom or a methyl group
- A represents an alkylene group
- n represents an average number of repetitions
- n 2 to 20.
- A is one or more types. Yes, in the case of two or more types, the repeating units may be arranged randomly or in blocks.
- A is preferably an alkylene group having 1 to 6 carbon atoms
- A is a polyoxypropylene mono (meth) acrylate having a propylene group
- A is a poly group having an ethylene group.
- Oxyethylene mono (meth) acrylate is more preferable
- polyoxypropylene mono (meth) acrylate is particularly preferable.
- the average number n of oxyalkylene is preferably 3 to 14, and more preferably 4 to 13.
- the urethane (meth) acrylate compound (A) can be produced as follows.
- (1) A method in which the above hydroxyl group-containing (meth) acrylate compound (a3), polyvalent isocyanate compound (a2), and polybutadiene polyol (a1) are charged in a reactor or separately and reacted
- (2) A method of reacting a hydroxyl group-containing (meth) acrylate compound (a3) with a reaction product obtained by previously reacting a polybutadiene-based polyol (a1) with a polyvalent isocyanate compound (a2).
- the method (2) is preferable from the viewpoint of reaction stability and reduction of by-products.
- Known reaction means can be used for the reaction of the polybutadiene-based polyol (a1) and the polyvalent isocyanate-based compound (a2).
- the molar ratio of the isocyanate group in the polyvalent isocyanate compound (a2) to the hydroxyl group in the polybutadiene polyol (a1) is usually about 2n: (2n-2) (n is an integer of 2 or more).
- the addition reaction of the reaction product obtained by previously reacting the polybutadiene-based polyol (a1) and the polyvalent isocyanate-based compound (a2) with the hydroxyl group-containing (meth) acrylate-based compound (a3) is also a known reaction. Means can be used.
- the reaction molar ratio between the reaction product and the hydroxyl group-containing (meth) acrylate compound (a3) is, for example, that the polyisocyanate compound (a2) has two isocyanate groups and the hydroxyl group-containing (meth) acrylate compound (a3).
- ) Has one hydroxyl group, the reaction product: hydroxyl group-containing (meth) acrylate compound (a3) is about 1: 2, and the polyisocyanate compound (a2) has three isocyanate groups.
- the reaction product: hydroxyl group-containing (meth) acrylate compound (a3) is about 1: 3.
- a catalyst is used for the purpose of promoting the reaction. It is also preferable to use, for example, dibutyltin dilaurate, dibutyltin diacetate, trimethyltin hydroxide, tetra-n-butyltin, zinc bisacetylacetonate, zirconium tris (acetylacetonate) ethylacetoacetate.
- Organometallic compounds such as zirconium tetraacetylacetonate, tin octenoate, zinc hexanoate, zinc octenoate, zinc stearate, zirconium 2-ethylhexanoate, cobalt naphthenate, stannous chloride, stannic chloride, acetic acid Metal salts such as potassium, Riethylamine, triethylenediamine, benzyldiethylamine, 1,4-diazabicyclo [2,2,2] octane, 1,8-diazabicyclo [5,4,0] undecene, N, N, N ', N'-tetramethyl-
- amine catalysts such as 1,3-butanediamine, N-methylmorpholine, N-ethylmorpholine, bismuth nitrate, bismuth bromide, bismuth iodide, bismuth sulfide, etc., organic bis
- an isocyanate group is optionally selected.
- Organic solvents that do not have a functional group that reacts with, for example, esters such as ethyl acetate and butyl acetate, ketones such as methyl ethyl ketone and methyl isobutyl ketone, organic solvents such as aromatics such as toluene and xylene, and ethylene
- An unsaturated monomer (for example, a compound as exemplified in an ethylenically unsaturated monomer (B) described later) may be used.
- the reaction temperature is usually 30 to 90 ° C., preferably 40 to 80 ° C.
- the reaction time is usually 2 to 10 hours, preferably 3 to 8 hours.
- the weight average molecular weight of the urethane (meth) acrylate compound (A) is preferably 5,000 to 100,000, particularly preferably 8,000 to 80,000, more preferably 10,000 to 50,000. It is. If the weight average molecular weight is too low, the adhesive strength tends to decrease. If the weight average molecular weight is too high, the viscosity tends to be too high and coating tends to be difficult.
- the above-mentioned weight average molecular weight is a weight average molecular weight in terms of standard polystyrene molecular weight, and the column: Shodex GPC KF-806L (excluded) was subjected to high performance liquid chromatography (manufactured by Showa Denko Co., Ltd., “Shodex GPC system-11 type”).
- Shodex GPC KF-806L excludeded
- high performance liquid chromatography manufactured by Showa Denko Co., Ltd., “Shodex GPC system-11 type”.
- the viscosity of the urethane (meth) acrylate compound (A) is preferably 1,000 to 200,000 mPa ⁇ s, particularly preferably 2,000 to 100,000 mPa ⁇ s at 60 ° C. More preferably, it is 3,000 to 80,000. If the viscosity is too high, handling tends to be difficult, and if it is too low, control of the film thickness tends to be difficult during coating. In addition, the measuring method of a viscosity is based on an E-type viscometer.
- ethylenically unsaturated monomer (B) used in the present invention (excluding (A)) (hereinafter sometimes referred to as “ethylenically unsaturated monomer (B)”) is a monofunctional monomer.
- a bifunctional monomer, a trifunctional or higher functional monomer may be mentioned.
- Examples of such monofunctional monomers include styrene monomers such as styrene, vinyl toluene, chlorostyrene, ⁇ -methylstyrene, methyl (meth) acrylate, ethyl (meth) acrylate, acrylonitrile, 2-methoxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, phenoxyethyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2-hydroxy -3-phenoxypropyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, glycerin mono (meth) acrylate, glycidyl (meth) acrylate, lauryl (meth) acrylate Lilate, cyclohexyl (meth)
- bifunctional monomers examples include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, and di Propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, ethylene oxide modified bisphenol A type di (meth) acrylate, propylene oxide modified bisphenol A Type di (meth) acrylate, cyclohexanedimethanol di (meth) acrylate, ethoxylated cyclohexanedimethanol di ( Acrylate), dimethylol dicyclopentane di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, 1,6-
- tri- or higher functional monomer examples include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa ( (Meth) acrylate, tri (meth) acryloyloxyethoxytrimethylolpropane, glycerin polyglycidyl ether poly (meth) acrylate, isocyanuric acid ethylene oxide modified triacrylate, caprolactone modified dipentaerythritol penta (meth) acrylate, caprolactone modified dipentaerythritol hexa (Meth) acrylate, caprolactone-modified pentaerythritol tri (meth) acrylate, cap Lactone modified pentaerythritol
- a Michael adduct of acrylic acid or 2-acryloyloxyethyl dicarboxylic acid monoester can be used in combination.
- examples of such a Michael adduct of acrylic acid include acrylic acid dimer, methacrylic acid dimer, acrylic acid trimer, methacrylic acid trimer, An acrylic acid tetramer, a methacrylic acid tetramer, etc. are mentioned.
- the 2-acryloyloxyethyl dicarboxylic acid monoester is a carboxylic acid having a specific substituent, such as 2-acryloyloxyethyl succinic acid monoester, 2-methacryloyloxyethyl succinic acid monoester, 2-acryloyloxyethyl.
- Examples thereof include phthalic acid monoester, 2-methacryloyloxyethyl phthalic acid monoester, 2-acryloyloxyethyl hexahydrophthalic acid monoester, and 2-methacryloyloxyethyl hexahydrophthalic acid monoester. Furthermore, other oligoester acrylates can also be mentioned.
- low-polarity (meth) acrylates such as isodecyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate and the like are preferable, and isodecyl (meth) is particularly preferable in terms of excellent compatibility and adhesive property balance. ) Acrylate.
- the content of the ethylenically unsaturated monomer (B) is preferably 5 to 900 parts by weight, particularly preferably 10 to 600 parts by weight, based on 100 parts by weight of the urethane (meth) acrylate compound (A). More preferably, it is 15 to 400 parts by weight. If the content is too large, the adhesion tends to decrease, and if the content is too small, the coating property tends to decrease.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention is obtained.
- the active energy ray-curable pressure-sensitive adhesive composition preferably further contains a photopolymerization initiator (C), and the photopolymerization initiator (C) generates radicals by the action of light.
- C photopolymerization initiator
- the photopolymerization initiator (C) generates radicals by the action of light.
- C is not particularly limited, for example, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy- 2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-2- Morpholino (4-thiomethylphenyl) propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholino Acetphenones such as
- auxiliary agents for these photopolymerization initiators (C) include triethanolamine, triisopropanolamine, 4,4′-dimethylaminobenzophenone (Michler ketone), 4,4′-diethylaminobenzophenone, 2-dimethylaminoethylbenzoic acid.
- These auxiliaries can be used alone or in combination of two or more.
- the blending amount of the photopolymerization initiator (C) is 1 to 10 parts by weight with respect to a total of 100 parts by weight of the urethane (meth) acrylate compound (A) and the ethylenically unsaturated monomer (B). It is preferably 2 to 5 parts by weight. If the amount is too small, the curing rate tends to decrease, and if too large, the curability is not improved and the economy tends to decrease.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention includes an antioxidant, Flame retardants, antistatic agents, fillers, leveling agents, stabilizers, reinforcing agents, matting agents and the like can also be blended.
- the crosslinking agent a compound having an action of causing crosslinking by heat, specifically, an epoxy compound, an aziricin compound, a melamine compound, an isocyanate compound, a chelate compound, and the like can be used.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention contains a polythiol compound (D) and the like from the viewpoints of acceleration of reaction rate, improvement of reaction efficiency, suppression of unreacted components, and improvement of adhesive strength.
- the polythiol compound (D) is preferably a compound having 2 to 6 mercapto groups in the molecule.
- aliphatic polythiols such as alkanedithiol having about 2 to 20 carbon atoms
- aromatic polythiols such as xylylenedithiol.
- a polythiol obtained by substituting a halogen atom of a halohydrin adduct of an alcohol with a mercapto group a polythiol comprising a hydrogen sulfide reaction product of a polyepoxide compound, a polyhydric alcohol having 2 to 6 hydroxyl groups in the molecule
- Examples include polythiols composed of esterified products with thioglycolic acid, ⁇ -mercaptopropionic acid, or ⁇ -mercaptobutanoic acid, and one or more of these can be used.
- the blending amount when blending the polythiol compound (D) is 10 parts by weight or less with respect to a total of 100 parts by weight of the urethane (meth) acrylate compound (A) and the ethylenically unsaturated monomer (B).
- the amount is particularly preferably 0.01 to 5 parts by weight.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention includes methanol, ethanol, propanol, n-butanol, i-butanol and the like for dilution in order to adjust the viscosity at the time of coating, if necessary.
- Alcohols acetone, methyl isobutyl ketone, methyl ethyl ketone, ketones such as cyclohexanone, cellosolves such as ethyl cellosolve, aromatics such as toluene and xylene, glycol ethers such as propylene glycol monomethyl ether, methyl acetate, ethyl acetate, Diluting solvents such as acetates such as butyl acetate and diacetone alcohol may be used, but the solvent remains in the coating film and the cured component may volatilize when dried. It is preferable not to contain.
- substantially free of solvent is usually 1% by weight or less, preferably 0.5% by weight or less, more preferably 0.1% by weight or less, based on the entire active energy ray-curable pressure-sensitive adhesive composition. It points to something.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention is usually applied to a base sheet or the like and is a pressure-sensitive adhesive sheet (the pressure-sensitive adhesive sheet means a pressure-sensitive adhesive film and pressure-sensitive adhesive tape unless otherwise specified). In many cases, it is practically used as an adhesive, and after being applied to a base material sheet, it is crosslinked by irradiation with active energy rays to form a pressure-sensitive adhesive, thereby exhibiting adhesiveness.
- the base sheet examples include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymer, polycarbonate resins, polyurethane resins, acrylic resins, and polystyrene resins.
- resin sheets such as resin, ethylene-vinyl acetate copolymer, polyvinyl chloride, polybutene, polybutadiene, polymethylpentene, and acrylonitrile butadiene styrene copolymer (ABS), and glass plates.
- Various substrate sheets may be subjected to surface treatment such as anchor layer, corona treatment, plasma treatment, and the like.
- the application method of the active energy ray-curable pressure-sensitive adhesive composition is not particularly limited, and examples thereof include wet coating methods such as spray, shower, dipping, roll, spin, screen printing, and ink jet printing. Can be mentioned.
- the drying conditions may be set to a drying temperature and a drying time sufficient to volatilize the solvent.
- the drying temperature is usually 40 to 100. It is preferably 50 ° C. to 90 ° C.
- the drying time may be a time that allows the solvent in the coating film to be completely volatilized at the time of drying, but is preferably 1 to 60 minutes in view of production suitability.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention is applied to a substrate sheet and dried, it is cross-linked by irradiation with active energy rays to become a pressure-sensitive adhesive, and further a pressure-sensitive adhesive sheet.
- a separator can be laminated on the surface of the pressure-sensitive adhesive for the purpose of protecting the pressure-sensitive adhesive from contamination until the pressure-sensitive adhesive sheet of the present invention is bonded to an adherend (member).
- a separator what carried out mold release processing of base materials, such as the resin sheet illustrated above and paper, cloth, and a nonwoven fabric, can be used.
- the pressure-sensitive adhesive composition on the base sheet usually, as a solution of the active energy ray-curable pressure-sensitive adhesive composition, after adjusting to a viscosity suitable for coating with a solvent, if necessary, Application and drying are performed.
- a coating method a direct application method in which a solution-like active energy ray-curable pressure-sensitive adhesive composition is directly applied to a substrate sheet, or a solution-like active energy ray-curable pressure-sensitive adhesive composition was applied to a separator. Later, a transfer coating method for bonding to a base sheet is exemplified.
- an active energy ray-curable pressure-sensitive adhesive composition is applied to a base sheet, dried by heating, and then irradiated with active energy rays, and then a separator is attached, or the active energy is applied to the base sheet.
- the method include a method in which a linear curable pressure-sensitive adhesive composition is applied and heat-dried, and then a separator is attached, and then an active energy ray is irradiated.
- the coating is performed by methods such as roll coating, die coating, gravure coating, comma coating, screen printing, and printing coating with a dispenser.
- the active energy ray-curable pressure-sensitive adhesive composition is applied to the separator, heated and dried, then irradiated with active energy rays, and then the substrate sheet is bonded, or the active energy is applied to the separator.
- the method include a method in which a linear curable pressure-sensitive adhesive composition is applied and dried by heating, and then a base material sheet is bonded to the active energy ray.
- the method similar to direct coating can be used.
- rays such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, infrared rays, electromagnetic waves such as X rays and ⁇ rays, electron beams, proton rays, neutron rays, etc.
- Curing by ultraviolet irradiation is advantageous from the standpoint of availability of the device and price.
- electron beam irradiation it can harden
- a high pressure mercury lamp that emits light in a wavelength range of 150 to 450 nm
- an ultrahigh pressure mercury lamp a carbon arc lamp, a metal halide lamp, a xenon lamp, a chemical lamp, an electrodeless discharge lamp, an LED, etc.
- Irradiation of about 30 to 5,000 mJ / cm 2 may be performed.
- heating can be performed as necessary to complete the curing.
- the thickness of the pressure-sensitive adhesive layer formed on the base sheet after irradiation with active energy rays is appropriately set depending on the application, but is usually 5 to 300 ⁇ m, preferably 10 to 250 ⁇ m. . If the thickness of the pressure-sensitive adhesive layer is too thin, the adhesive physical properties tend to be difficult to stabilize, and if it is too thick, adhesive residue tends to occur.
- the storage elastic modulus at 23 ° C. is 1.0 ⁇ 10 6 or more and the glass transition temperature of the pressure-sensitive adhesive layer is ⁇ 30 ° C. or less.
- Such storage elastic modulus is preferably 1.0 ⁇ 10 6 to 1.0 ⁇ 10 8 , particularly 1.0 ⁇ 10 6 to 5.0 ⁇ 10 7 , more preferably 1.0 ⁇ 10 6 to 1. It is preferably 0.0 ⁇ 10 7 .
- the glass transition temperature is preferably ⁇ 60 to ⁇ 30 ° C., particularly ⁇ 55 to ⁇ 31 ° C., more preferably ⁇ 50 to ⁇ 32 ° C.
- the glass transition temperature is larger than the upper limit value, the adhesive strength is increased and the peelability is deteriorated.
- the adhesive strength varies depending on the type of adherend.
- the initial adhesive strength is preferably 3 N / 25 mm or more in 180 degree peel strength according to JISJZ 0237. Is preferably 5 N / 25 mm or more, more preferably 9 N / 25 mm or more.
- the adhesive strength after exposure to a high temperature environment is preferably 3 N / 25 mm or more, particularly 5 N / 25 mm or more, more preferably 9 N / 25 mm or more.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention has releasability, it can be used as a protective sheet for a surface such as a metal plate, a glass plate, a plastic plate, a resin-coated surface, or a temporary fixing sheet. It can be widely used as an adhesive sheet, that is, an adhesive sheet for surface protection.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention can also be used as a resin for bonding in electronic component fixing sheets (tapes), electronic component label sheets (tapes), optical displays or touch sensors. It is. For example, bonding of an optical display panel and a touch panel, bonding of an optical display panel and a protection panel, bonding of a touch panel and a protection panel, bonding of an optical display panel and an optical display panel, optical display panel and parallax barrier And can be used for bonding. Bonding can be performed by a usual method.
- A1-1 1,4-linked hydrogenated polybutadiene polyol containing 35 mol% of polybutadiene structure (number average molecular weight 2,200, hydroxyl value 49.9 mgKOH / g)
- A2-1: hexamethylene diisocyanate a2-2: isophorone diisocyanate a2-3: dicyclohexylmethane 4,4-disocyanate a3-1: 4-hydroxybutyl acrylate a3-2: polypropylene glycol monoacrylate (of oxypropylene (Average repeating unit number n 6, number average molecular weight 449, hydroxyl value 125.0 mgKOH / g)
- C-1 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .; trade name “Irgacure 184”)
- D-1 Pentaerythritol tetrakis (3-mercaptopropionate)
- D-2 Pentaerythritol tetrakis (3-mercaptobutyrate)
- Example 1 For 100 parts of the urethane (meth) acrylate compound (A-1) produced in Production Example 1, 43 parts of the ethylenically unsaturated monomer (B-1) and 4 parts of the photopolymerization initiator (C-1) are uniformly used. To obtain an active energy ray-curable pressure-sensitive adhesive composition.
- Example 2 In the same manner as in Example 1, except that the urethane (meth) acrylate compound (A-2) produced in Production Example 2 was used instead of the urethane (meth) acrylate compound (A-1), the active energy was changed. A line-curable pressure-sensitive adhesive composition was obtained.
- Example 3 In the same manner as in Example 1, except that the urethane (meth) acrylate compound (A-3) produced in Production Example 3 was used instead of the urethane (meth) acrylate compound (A-1), the active energy was changed. A line-curable pressure-sensitive adhesive composition was obtained.
- Example 4 In the same manner as in Example 1, except that the urethane (meth) acrylate compound (A-4) produced in Production Example 4 was used instead of the urethane (meth) acrylate compound (A-1), the active energy was changed. A line-curable pressure-sensitive adhesive composition was obtained.
- Example 5 In the same manner as in Example 1, except that the urethane (meth) acrylate compound (A-5) produced in Production Example 5 was used instead of the urethane (meth) acrylate compound (A-1), the active energy was changed. A line-curable pressure-sensitive adhesive composition was obtained.
- Example 6 In the same manner as in Example 1, except that the urethane (meth) acrylate compound (A-6) produced in Production Example 5 was used instead of the urethane (meth) acrylate compound (A-1), the active energy was changed. A line-curable pressure-sensitive adhesive composition was obtained.
- Example 7 An active energy ray-curable pressure-sensitive adhesive composition was obtained in the same manner as in Example 5, except that 0.5 part of the polythiol compound (D-1) was further added.
- Example 8 An active energy ray-curable pressure-sensitive adhesive composition was obtained in the same manner as in Example 7, except that (D-2) was used instead of the polythiol compound (D-1).
- Example 9 An active energy ray-curable pressure-sensitive adhesive composition was obtained in the same manner as in Example 6 except that 0.5 part of the polythiol compound (D-2) was further added.
- Example 1 In Example 1, the same procedure was followed except that the urethane (meth) acrylate compound (A′-1) produced in Production Example 7 was used instead of the urethane (meth) acrylate compound (A-1). An energy ray-curable pressure-sensitive adhesive composition was obtained.
- ⁇ Storage modulus> (Measuring method) A test piece having a length of 20 mm and a width of 3 mm was cut out from the pressure-sensitive adhesive sheet obtained by the above method, and using the obtained test piece, a tensile mode of a dynamic viscoelasticity measuring device “DVA-225” manufactured by IT Measurement Control Co., Ltd. was measured at a frequency of 1 Hz, a heating rate of 3 ° C./min, and a strain of 0.1%.
- DVA-225 dynamic viscoelasticity measuring device manufactured by IT Measurement Control Co., Ltd.
- ⁇ Glass transition temperature> (Measuring method) The ratio (tan ⁇ ) of the imaginary part (loss elastic modulus) to the real part (storage elastic modulus) of the complex elastic modulus obtained by the storage elastic modulus measurement is obtained, and the maximum peak temperature of tan ⁇ is determined as the glass transition temperature (° C.). It was.
- Examples 1 to 9 in which the adhesive modulus obtained by curing has a storage elastic modulus at 23 ° C. of 1.0 ⁇ 10 6 or more and the glass transition temperature of the adhesive layer is ⁇ 30 ° C. or less. It can be seen that the active energy ray-curable pressure-sensitive adhesive composition exhibits excellent releasability when used as a pressure-sensitive adhesive.
- the active energy ray-curable adhesives of Examples 4 to 9 containing a urethane (meth) acrylate compound using a hydroxyl group-containing polyoxyalkylene mono (meth) acrylate as the hydroxyl group-containing (meth) acrylate compound (a3).
- the agent composition is superior to the initial adhesive force when used as an adhesive. Furthermore, it can be seen that the active energy ray-curable pressure-sensitive adhesive compositions of Examples 7 to 9 containing a thiol compound are very excellent in heat resistance when used as a pressure-sensitive adhesive. On the other hand, the pressure-sensitive adhesive layer using the active energy ray-curable pressure-sensitive adhesive composition of Comparative Example 1 whose storage elastic modulus and glass transition temperature are both outside the desired ranges is inferior in peelability when exposed to a high temperature environment. It can be seen that it is.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention has releasability, it can be used as a protective sheet for a surface such as a metal plate, a glass plate, a plastic plate, a resin-coated surface, or a temporary fixing sheet. It can be widely used as a pressure-sensitive adhesive sheet, especially as a pressure-sensitive adhesive sheet for surface protection.
- the active energy ray-curable pressure-sensitive adhesive composition of the present invention can also be used as a resin for bonding in electronic component fixing sheets (tapes), electronic component label sheets (tapes), optical displays or touch sensors. It is. For example, bonding of an optical display panel and a touch panel, bonding of an optical display panel and a protection panel, bonding of a touch panel and a protection panel, bonding of an optical display panel and an optical display panel, optical display panel and parallax barrier And can be used for bonding.
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Abstract
Description
これは、従来のポリブタジエン系ポリオール含有ウレタン(メタ)アクリレート系化合物を用いた粘着剤においては、ポリブタジエン系ポリオールとして、ブタジエンが1,2結合して得られるポリブタジエン構造を多く有するブタジエン系ポリオールが用いられており、粘着力や密着力には優れるものの、比較的結晶性が低いため、高温環境下にさらされると、被着体からの剥離性が低下し、また糊残りが生じるものであったところ、ポリブタジエン系ポリオールとして、ブタジエンが1,4結合して得られるポリブタジエン構造を用い、更にその構造を通常より多めに含有させたポリブタジエン系ポリオールを用いることにより、結晶性が高くなり、粘着力と剥離性の両方ともに優れた粘着剤が得られたものである。
また、本発明の要旨は、ポリブタジエン系ポリオール(a1)、多価イソシアネート系化合物(a2)、水酸基含有(メタ)アクリレート系化合物(a3)を反応させてなるウレタン(メタ)アクリレート系化合物(A)、およびエチレン性不飽和モノマー(B)(但し、(A)を除く。)を含有してなる活性エネルギー線硬化性粘着剤組成物であり、ポリブタジエン系ポリオール(a1)が、ブタジエンが1,4結合して得られるポリブタジエン構造を15モル%以上含有するポリブタジエン系ポリオールであることを特徴とする活性エネルギー線硬化性粘着剤組成物にも関するものである。
なお、本発明において、(メタ)アクリル酸とはアクリル酸あるいはメタクリル酸を、(メタ)アクリルとはアクリルあるいはメタクリルを、(メタ)アクリロイルとはアクリロイルあるいはメタクリロイルを、(メタ)アクリレートとはアクリレートあるいはメタクリレートをそれぞれ意味するものである。また、アクリル系樹脂とは、(メタ)アクリレート系モノマーを少なくとも1種含有する重合成分を重合して得られる樹脂である。
活性エネルギー線硬化性粘着剤組成物を、膜厚175μmとなるように剥離ポリエチレンテレフタレート(PET)フィルム(厚さ50μm)にアプリケーターを用いて塗布し、卓上UV照射装置(岩崎電気社製、「コンベア式卓上照射装置」)にて80W/cm(高圧水銀ランプ)×18cmH×2.04m/min×3Pass(積算2,400mJ/cm2)の条件下で紫外線を照射し、硬化させ粘着シートとする。該粘着シートを長さ20mm×幅3mmに切り出し試験片とし、該試験片について、アイティー計測制御社製動的粘弾性測定装置「DVA-225」の引っ張りモードを用いて、周波数1Hz、昇温速度3℃/分、歪0.1%の条件下で測定することにより得られる複素弾性率の実数部を、本発明の貯蔵弾性率とする。
上記貯蔵弾性率の測定により得られる複素弾性率の実数部(貯蔵弾性率)に対する虚数部(損失弾性率)の比(tanδ)を求め、このtanδの最大ピーク温度をガラス転移温度(℃)とする。
これらの中でも、貯蔵弾性率が高くなる点で、1,3-ブタジエンがトランスおよびシス1,4結合したポリブタジエン構造を15モル%以上含有することが好ましく、特に好ましくは15~50モル%、更に好ましくは20~45モル%、殊に好ましくは25~40モル%である。
かかる1,3-ブタジエンが1,4結合したポリブタジエン構造の含有割合が少なすぎると粘着剤層の貯蔵弾性率が低下する傾向があり、多すぎると粘着剤層の結晶性が高くなり、被着体との密着性が低下する傾向がある。
上記水酸基価は、JIS K 0070-1992に基づき測定することができる。
また、多価イソシアネート系化合物は1種または2種以上組み合わせて使用することができる。
2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、2-ヒドロキシブチル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、6-ヒドロキシヘキシル(メタ)アクリレート等のアルキル基の炭素数が2~20(好ましくは2~18)であるヒドロキシアルキル(メタ)アクリレート;
ジプロピレングリコール(メタ)アクリレート、ポリエチレングリコールモノ(メタ)アクリレート、ポリプロピレングリコールモノ(メタ)アクリレート、ポリエチレングリコール-ポリプロピレングリコールモノ(メタ)アクリレート、ポリ(エチレングリコール-テトラメチレングリコール)モノ(メタ)アクリレート、ポリ(プロピレングリコール-テトラメチレングリコール)モノ(メタ)アクリレート等の水酸基含有ポリオキシアルキレンモノ(メタ)アクリレート;
2-ヒドロキシエチルアクリロイルホスフェート、2-(メタ)アクリロイロキシエチル-2-ヒドロキシプロピルフタレート、カプロラクトン変性2-ヒドロキシエチル(メタ)アクリレート、脂肪酸変性-グリシジル(メタ)アクリレート、2-ヒドロキシ-3-(メタ)アクリロイロキシプロピル(メタ)アクリレート等のエチレン性不飽和基を1つ含有する(メタ)アクリレート系化合物;
グリセリンジ(メタ)アクリレート、2-ヒドロキシ-3-アクリロイル-オキシプロピルメタクリレート等のエチレン性不飽和基を2つ含有する(メタ)アクリレート系化合物;
ペンタエリスリトールトリ(メタ)アクリレート、カプロラクトン変性ペンタエリスリトールトリ(メタ)アクリレート、エチレンオキサイド変性ペンタエリスリトールトリ(メタ)アクリレート、ジペンタエリスリトールペンタ(メタ)アクリレート、カプロラクトン変性ジペンタエリスリトールペンタ(メタ)アクリレート、エチレンオキサイド変性ジペンタエリスリトールペンタ(メタ)アクリレート等のエチレン性不飽和基を3つ以上含有する(メタ)アクリレート系化合物;
が挙げられる。水酸基含有(メタ)アクリレート系化合物(a3)は単独でもしくは2種以上併せて用いることができる。
上記一般式(1)で表される化合物の中でも、Aが炭素原子数1~6のアルキレン基が好ましく、Aがプロピレン基であるポリオキシプロピレンモノ(メタ)アクリレート、Aがエチレン基であるポリオキシエチレンモノ(メタ)アクリレートがより好ましく、特には、ポリオキシプロピレンモノ(メタ)アクリレートが好ましい。
さらに、上記一般式(1)中、オキシアルキレンの平均繰り返し数nは、3~14が好ましく、4~13がより好ましい。
例えば、(1)上記の水酸基含有(メタ)アクリレート系化合物(a3)、多価イソシアネート系化合物(a2)、ポリブタジエン系ポリオール(a1)を、反応器に一括又は別々に仕込み反応させる方法、(2)ポリブタジエン系ポリオール(a1)と多価イソシアネート系化合物(a2)とを予め反応させて得られる反応生成物に、水酸基含有(メタ)アクリレート系化合物(a3)を反応させる方法などが挙げられるが、反応の安定性や副生成物の低減等の点から(2)の方法が好ましい。
なお、粘度の測定法はE型粘度計による。
上記2-アクリロイルオキシエチルジカルボン酸モノエステルとしては、特定の置換基をもつカルボン酸であり、例えば2-アクリロイルオキシエチルコハク酸モノエステル、2-メタクリロイルオキシエチルコハク酸モノエステル、2-アクリロイルオキシエチルフタル酸モノエステル、2-メタクリロイルオキシエチルフタル酸モノエステル、2-アクリロイルオキシエチルヘキサヒドロフタル酸モノエステル、2-メタクリロイルオキシエチルヘキサヒドロフタル酸モノエステル等が挙げられる。更に、その他オリゴエステルアクリレートも挙げられる。
ポリチオール化合物(D)としては、分子内にメルカプト基を2~6個有する化合物が好ましく、例えば、炭素数2~20程度のアルカンジチオール等の脂肪族ポリチオール類、キシリレンジチオール等の芳香族ポリチオール類、アルコール類のハロヒドリン付加物のハロゲン原子をメルカプト基で置換してなるポリチオール類、ポリエポキシド化合物の硫化水素反応生成物からなるポリチオール類、分子内に水酸基2~6個を有する多価アルコール類と、チオグリコール酸、β-メルカプトプロピオン酸、又はβ-メルカプトブタン酸とのエステル化物からなるポリチオール類等を挙げることができ、これらのうち1種類または2種類以上を使用できる。
なお、実質的に溶剤を含まないとは、活性エネルギー線硬化性粘着剤組成物全体に対して通常1重量%以下、好ましくは0.5重量%以下、更に好ましくは0.1重量%以下であることを指す。
上記活性エネルギー線硬化性粘着剤組成物の塗工方法としては、特に限定されるものではなく、例えば、スプレー、シャワー、ディッピング、ロール、スピン、スクリーン印刷、インクジェット印刷等のようなウェットコーティング法が挙げられる。
紫外線照射後は、必要に応じて加熱を行って硬化の完全を図ることもできる。
また、かかるガラス転移温度は-60~-30℃であることが好ましく、特には-55~-31℃、更には-50~-32℃であることが好ましい。ガラス転移温度が上限値より大きすぎると粘着力が高くなり、剥離性が悪化する。
以下の通りウレタン(メタ)アクリレート系化合物(A)を製造した。
温度計、撹拌機、水冷コンデンサー、窒素ガス吹き込み口を備えた4つ口フラスコに、ヘキサメチレンジイソシアネート(a2-1)100.0g(0.59モル)、1,4結合したポリブタジエン構造を35モル%含む水添ポリブタジエンポリオール(数平均分子量2,200、水酸基価49.9mgKOH/g)(a1-1)890.5g(0.40モル)を仕込み、70℃で反応させ、残存イソシアネート基が1.7%となった時点で、温度を60℃に下げ、4-ヒドロキシブチルアクリレート(a3-1)88.6g(0.41モル)を加え反応させ、残存イソシアネート基が0.2%となった時点で反応を終了し、ウレタン(メタ)アクリレート系化合物(A-1)(重量平均分子量22,000)を得た。
温度計、撹拌機、水冷コンデンサー、窒素ガス吹き込み口を備えた4つ口フラスコに、イソホロンジイソシアネート(a2-2)100.0g(0.45モル)、1,4結合したポリブタジエン構造を35モル%含む水添ポリブタジエンポリオール(数平均分子量2,200、水酸基価49.9mgKOH/g)(a1-1)673.7g(0.30モル)を仕込み、70℃で反応させ、残存イソシアネート基が1.6%となった時点で、温度を60℃に下げ、4-ヒドロキシブチルアクリレート(a3-1)44.3g(0.31モル)を加え反応させ、残存イソシアネート基が0.2%となった時点で反応を終了し、ウレタンアクリレート系化合物(A-2)(重量平均分子量20,000)を得た。
温度計、撹拌機、水冷コンデンサー、窒素ガス吹き込み口を備えた4つ口フラスコに、ジシクロヘキシルメタン4,4’-ジイソシアナート(a2-3)100.0g(0.38モル)、1,4結合したポリブタジエン構造を35モル%含む水添ポリブタジエンポリオール(数平均分子量2,200、水酸基価49.9mgKOH/g)(a1-1)571.0g(0.25モル)を仕込み、70℃で反応させ、残存イソシアネート基が1.6%となった時点で、温度を60℃に下げ、4-ヒドロキシブチルアクリレート(a3-1)37.6g(0.26モル)を加え反応させ、残存イソシアネート基が0.2%となった時点で反応を終了し、ウレタンアクリレート系化合物(A-3)(重量平均分子量16,500)を得た。
製造例1において、4-ヒドロキシブチルアクリレート(a3-1)をオキシプロピレンの平均繰り返し単位数n=6であるポリプロピレングリコールモノアクリレート(数平均分子量449、水酸基価125.0mgKOH/g)(a3-2)182.4g(0.41モル)に変えた以外は同様に反応し、ウレタン(メタ)アクリレート系化合物(A-4)(重量平均分子量21,000)を得た。
製造例2において、4-ヒドロキシブチルアクリレート(a3-1)をオキシプロピレンの平均繰り返し単位数n=6であるポリプロピレングリコールモノアクリレート(数平均分子量449、水酸基価125.0mgKOH/g)(a3-2)138.0g(0.31モル)に変えた以外は同様に反応し、ウレタン(メタ)アクリレート系化合物(A-5)(重量平均分子量20,800)を得た。
製造例3において、4-ヒドロキシブチルアクリレート(a3-1)をオキシプロピレンの平均繰り返し単位数n=6であるポリプロピレングリコールモノアクリレート(数平均分子量449、水酸基価125.0mgKOH/g)(a3-2)117.0g(0.26モル)に変えた以外は同様に反応し、ウレタン(メタ)アクリレート系化合物(A-6)(重量平均分子量20,400)を得た。
温度計、撹拌機、水冷コンデンサー、窒素ガス吹き込み口を備えた4つ口フラスコに、イソホロンジイソシアネート(a2-2)100.0g(0.45モル)、1,4結合したポリブタジエン構造を9モル%含む水添ポリブタジエンポリオール(数平均分子量2,400、水酸基価47.4mgKOH/g)(a’1-1)709.7g(0.30モル)を仕込み、70℃で反応させ、残存イソシアネート基が1.6%となった時点で、温度を60℃に下げ、4-ヒドロキシブチルアクリレート44.3g(0.31モル)を加え反応させ、残存イソシアネート基が0.2%となった時点で反応を終了し、ウレタンアクリレート系化合物(A’-1)(重量平均分子量17,000)を得た。
・a1-1:1,4-結合したポリブタジエン構造を35モル%含む水添ポリブタジエンポリオール(数平均分子量2,200、水酸基価49.9mgKOH/g)
・a’1-1:1,4-結合したポリブタジエン構造を9モル%含む水添ポリブタジエンポリオール(数平均分子量2,400、水酸基価47.4mgKOH/g
・a2-1:ヘキサメチレンジイソシアネート
・a2-2:イソホロンジイソシアネート
・a2-3:ジシクロヘキシルメタン4,4-ジソシアナート
・a3-1:4-ヒドロキシブチルアクリレート
・a3-2:ポリプロピレングリコールモノアクリレート(オキシプロピレンの平均繰り返し単位数n=6、数平均分子量449、水酸基価125.0mgKOH/g)
・(B-1):イソデシルアクリレート(サートマー製;商品名「SR-395」)
・(C-1):1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン株式会社製;商品名「イルガキュア184」)
・(D-1):ペンタエリスリトールテトラキス(3-メルカプトプロピオネート)
・(D-2):ペンタエリスリトールテトラキス(3-メルカプトブチレート)
上記製造例1で製造したウレタン(メタ)アクリレート系化合物(A-1)100部に対し、エチレン性不飽和モノマー(B-1)43部、光重合開始剤(C-1)4部を均一に混合し、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例2で製造したウレタン(メタ)アクリレート系化合物(A-2)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例3で製造したウレタン(メタ)アクリレート系化合物(A-3)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例4で製造したウレタン(メタ)アクリレート系化合物(A-4)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例5で製造したウレタン(メタ)アクリレート系化合物(A-5)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例5で製造したウレタン(メタ)アクリレート系化合物(A-6)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例5において、更にポリチオール化合物(D-1)を0.5部配合した以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例7において、ポリチオール化合物(D-1)に代えて(D-2)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例6において、更にポリチオール化合物(D-2)を0.5部配合した以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
実施例1において、ウレタン(メタ)アクリレート系化合物(A-1)に代えて上記製造例7で製造したウレタン(メタ)アクリレート系化合物(A’-1)を用いた以外は同様にして、活性エネルギー線硬化性粘着剤組成物を得た。
上記実施例1~9、比較例1で得られた活性エネルギー線硬化性粘着剤組成物を、膜厚175μmとなるように剥離ポリエチレンテレフタレート(PET)フィルム(厚さ50μm)にアプリケーターを用いて塗布し、卓上UV照射装置(岩崎電気社製、「コンベア式卓上照射装置」)にて80W/cm(高圧水銀ランプ)×18cmH×2.04m/min×3Pass(積算2,400mJ/cm2)の条件下で紫外線を照射し、硬化させることにより弾性率測定用粘着シートを得た。
(測定方法)
上記方法により得られた粘着シートから長さ20mm×幅3mmの試験片を切り出し、得られた試験片を用いて、アイティー計測制御社製動的粘弾性測定装置「DVA-225」の引っ張りモードを用いて、周波数1Hz、昇温速度3℃/分、歪0.1%で測定を行なった。
(測定方法)
上記貯蔵弾性率の測定により得られた複素弾性率の実数部(貯蔵弾性率)に対する虚数部(損失弾性率)の比(tanδ)を求め、このtanδの最大ピーク温度をガラス転移温度(℃)とした。
上記実施例1~9、比較例1で得られた活性エネルギー線硬化性粘着剤組成物を、膜厚175μmとなるように易接着処理ポリエチレンテレフタレート(PET)フィルム(厚さ125μm)にアプリケーターを用いて塗布し、卓上UV照射装置(岩崎電気社製、「コンベア式卓上照射装置」)にて80W/cm(高圧水銀ランプ)×18cmH×2.04m/min×3Pass(積算2,400mJ/cm2)の条件下で紫外線を照射し、硬化させることにより粘着力測定用粘着シートを得た。
(1)初期粘着力
得られた粘着シートを25mm×100mmに切断した後、これを、被着体としてのガラス板に、23℃、相対湿度50%の雰囲気下で2kgゴムローラーを用いて2往復させることにより圧着し、試験片を作製した。この試験片を、同雰囲気下で、30分放置した後、剥離速度0.3m/分により、180度剥離試験を行い、初期粘着力(N/25mm)を測定した。また、被着体への糊残りの有無を目視にて確認した。評価基準は下記の通りである。
(評価基準)
◎・・・粘着力が9N以上、かつ糊残りは確認されなかった
○・・・粘着力が5N以上、9N未満であるが、糊残りは確認されなかった
△・・・粘着力が5N未満であるが、糊残りは確認されなかった
×・・・基材界面剥離がおこった
上記初期粘着力測定で作製した試験片と同様の方法により試験片を作製し、この試験片を、80℃、ドライ雰囲気下で、100時間放置した。その後、23℃、相対湿度50%の雰囲気下で、剥離速度0.3m/分により、180度剥離試験を行い、耐熱粘着力(N/25mm)を測定した。また、被着体への糊残りの有無を目視にて確認した。評価基準は下記の通りである。 (評価基準)
○・・・糊残りは確認されなかった
△・・・僅かに糊残りが確認された
×・・・基材界面剥離がおこった
また、水酸基含有(メタ)アクリレート系化合物(a3)として、水酸基含有ポリオキシアルキレンモノ(メタ)アクリレートを用いたウレタン(メタ)アクリレート系化合物を含有する実施例4~9の活性エネルギー線硬化性粘着剤組成物は、粘着剤として使用した際に、初期粘着力により優れることがわかる。
さらに、チオール化合物を含有してなる実施例7~9の活性エネルギー線硬化性粘着剤組成物は、粘着剤として使用した際に、耐熱性に非常に優れることがわかる。
一方、貯蔵弾性率、ガラス転移温度が共に所望の範囲を外れる比較例1の活性エネルギー線硬化性粘着剤組成物を用いてなる粘着剤層は、高温環境下にさらされると剥離性に劣るものであることがわかる。
なお、本願は、2014年6月30日付で出願された日本国特許出願(特願2014-134175)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 (7)
- ポリブタジエン系ポリオール(a1)、多価イソシアネート系化合物(a2)、水酸基含有(メタ)アクリレート系化合物(a3)を反応させてなるウレタン(メタ)アクリレート系化合物(A)、およびエチレン性不飽和モノマー(B)(但し、(A)を除く。)を含有してなる活性エネルギー線硬化性粘着剤組成物であり、該組成物を活性エネルギー線照射により硬化して得られる粘着剤層の23℃における貯蔵弾性率が1.0×106以上、かつ、粘着剤層のガラス転移温度が-30℃以下であることを特徴とする活性エネルギー線硬化性粘着剤組成物。
- ポリブタジエン系ポリオール(a1)が、ブタジエンが1,4結合して得られるポリブタジエン構造を15モル%以上含有するポリブタジエン系ポリオールであることを特徴とする請求項1記載の活性エネルギー線硬化性粘着剤組成物。
- ポリブタジエン系ポリオール(a1)、多価イソシアネート系化合物(a2)、水酸基含有(メタ)アクリレート系化合物(a3)を反応させてなるウレタン(メタ)アクリレート系化合物(A)、およびエチレン性不飽和モノマー(B)(但し、(A)を除く。)を含有してなる活性エネルギー線硬化性粘着剤組成物であり、ポリブタジエン系ポリオール(a1)が、ブタジエンが1,4結合して得られるポリブタジエン構造を15モル%以上含有するポリブタジエン系ポリオールであることを特徴とする活性エネルギー線硬化性粘着剤組成物。
- ウレタン(メタ)アクリレート系化合物(A)の重量平均分子量が5,000~100,000であることを特徴とする請求項1~3いずれか1項に記載の活性エネルギー線硬化性粘着剤組成物。
- 実質的に溶剤を含有しないことを特徴とする請求項1~4いずれか1項に記載の活性エネルギー線硬化性粘着剤組成物。
- 請求項1~5いずれか1項に記載の活性エネルギー線硬化性粘着剤組成物を硬化してなることを特徴とする粘着剤。
- 請求項6記載の粘着剤からなる粘着剤層を有することを特徴とする粘着シート。
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EP15814770.2A EP3162867A4 (en) | 2014-06-30 | 2015-06-26 | Active-energy-ray-curable adhesive composition, adhesive, and adhesive sheet |
KR1020167036519A KR20170027734A (ko) | 2014-06-30 | 2015-06-26 | 활성 에너지선 경화성 점착제 조성물, 점착제, 및 점착 시트 |
JP2015535918A JP6482463B2 (ja) | 2014-06-30 | 2015-06-26 | 活性エネルギー線硬化性粘着剤組成物、粘着剤及び粘着シート |
CN201580036124.8A CN106536667A (zh) | 2014-06-30 | 2015-06-26 | 活性能量射线固化性粘合剂组合物、粘合剂和粘合片 |
US15/322,467 US20170152403A1 (en) | 2014-06-30 | 2015-06-26 | Active-energy-ray-curable pressure-sensitive adhesive composition, pressure-sensitive adhesive, and pressure-sensitive adhesive sheet |
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JP2014134175 | 2014-06-30 | ||
JP2014-134175 | 2014-06-30 |
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EP (1) | EP3162867A4 (ja) |
JP (1) | JP6482463B2 (ja) |
KR (1) | KR20170027734A (ja) |
CN (1) | CN106536667A (ja) |
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JP2018154700A (ja) * | 2017-03-16 | 2018-10-04 | 株式会社スリーボンド | 硬化性樹脂組成物 |
JP2019059922A (ja) * | 2017-09-22 | 2019-04-18 | 荒川化学工業株式会社 | 紫外線硬化型コーティング組成物、硬化被膜、被覆物 |
WO2019130741A1 (ja) * | 2017-12-26 | 2019-07-04 | 日東電工株式会社 | 光学部材用表面保護シート |
KR20190092288A (ko) | 2018-01-30 | 2019-08-07 | 닛토덴코 가부시키가이샤 | 점착제, 경화성 점착제 조성물, 점착 시트 및 그의 제조 방법 |
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EP3162867A4 (en) | 2017-12-20 |
CN106536667A (zh) | 2017-03-22 |
TW201606028A (zh) | 2016-02-16 |
US20170152403A1 (en) | 2017-06-01 |
KR20170027734A (ko) | 2017-03-10 |
EP3162867A1 (en) | 2017-05-03 |
JP6482463B2 (ja) | 2019-03-13 |
JPWO2016002666A1 (ja) | 2017-04-27 |
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