WO2016002388A1 - 紫外線硬化型粘着剤組成物、及び、粘着フィルム - Google Patents
紫外線硬化型粘着剤組成物、及び、粘着フィルム Download PDFInfo
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- WO2016002388A1 WO2016002388A1 PCT/JP2015/065037 JP2015065037W WO2016002388A1 WO 2016002388 A1 WO2016002388 A1 WO 2016002388A1 JP 2015065037 W JP2015065037 W JP 2015065037W WO 2016002388 A1 WO2016002388 A1 WO 2016002388A1
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- sensitive adhesive
- ultraviolet curable
- meth
- adhesive film
- adhesive composition
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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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
Definitions
- the present invention relates to an ultraviolet curable pressure-sensitive adhesive composition that can be suitably used for production of IT-related products.
- a touch panel is installed in a mobile terminal such as a smartphone or a tablet.
- the touch panel is composed of a laminated body of a cover glass, an electrode glass / film, and a liquid crystal panel, and these are adhesive sheets (Optical Clear Adhesive, hereinafter “OCA”).
- OCA Optical Clear Adhesive
- a smartphone a decorative layer is provided on a cover glass, and a step of about 20 ⁇ m is formed. Therefore, the OCA needs to adhere to the cover glass while following the step.
- the design of smartphones has increased and the decorative layer has become thicker, approximately 60 ⁇ m.
- the distortion is large, and the OCA is required to be capable of following a thicker step and distortion.
- it is necessary to follow a large step without increasing the thickness of the OCA.
- UV curable pressure-sensitive adhesive composition examples include a pressure-sensitive adhesive obtained by using a solventless pressure-sensitive adhesive composition containing urethane acrylate, an acrylic monomer, and a photopolymerization initiator. (For example, see Patent Document 1).
- the step following property is good, but if the pressure-sensitive adhesive is too soft, it flows during heating and entrains bubbles. And sticking out of the adhesive and non-uniform film thickness.
- the problem to be solved by the present invention is to provide an ultraviolet curable pressure-sensitive adhesive composition that provides an adhesive film that is excellent in level-step following property and that does not contain bubbles.
- the present invention is an ultraviolet curable pressure-sensitive adhesive composition containing an organic solvent (C), and is obtained by drying the organic solvent (C) after coating the ultraviolet curable pressure-sensitive adhesive composition on a substrate.
- the value of the storage elastic modulus (G ′) at 60 to 80 ° C. of the UV curable adhesive film before UV irradiation is less than 1.5 ⁇ 10 5 Pa and the value of the loss tangent (tan ⁇ ) is 1 or less.
- An ultraviolet curable pressure-sensitive adhesive composition is provided.
- the organic solvent (C) is dried to obtain a UV curable pressure-sensitive adhesive film, and then the pressure-sensitive adhesive of the UV-curable pressure-sensitive adhesive film.
- the pressure-sensitive adhesive film is obtained by attaching a layer to a substrate, heating the layer, and then irradiating with ultraviolet rays.
- the pressure-sensitive adhesive film obtained by drying and irradiating the ultraviolet curable pressure-sensitive adhesive composition of the present invention is excellent in step followability and moisture and heat whitening resistance, and has no adhesive residue on the blade during cutting and has excellent cutting properties.
- UV curable adhesive film before UV irradiation has moderate strength due to thermal crosslinking, so it does not flow during heating, does not entrain air bubbles, protrude adhesive, and cause non-uniform film thickness. The optical characteristics are not adversely affected.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention can be suitably used as a pressure-sensitive adhesive used for optical members, and in particular, touch panels, liquid crystal displays, plasma displays, organic EL, personal computers, mobile phones and the like. It can be suitably used for manufacturing IT-related products.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention contains an organic solvent (C), and after coating the ultraviolet curable pressure-sensitive adhesive composition on a substrate, the organic solvent (C) is dried.
- the obtained ultraviolet curable pressure-sensitive adhesive film before ultraviolet irradiation has a storage elastic modulus (G ′) at 60 to 80 ° C. of less than 1.5 ⁇ 10 5 Pa and a loss tangent (tan ⁇ ) value of 1 or less. It is.
- the value of the storage elastic modulus (G ′) at 60 to 80 ° C. of the ultraviolet curable adhesive film is less than 1.5 ⁇ 10 5 Pa in order to obtain an adhesive film having excellent step following ability.
- the value of loss tangent (tan ⁇ ) at 60 to 80 ° C. is essential, and there is no bubble entrainment (hereinafter abbreviated as “bubble entrainment resistance”). It is essential.
- the UV curable adhesive film can fill the step by applying pressure or the like, but the air present in the gap becomes bubbles and is mixed into the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film, so that a pressure-sensitive adhesive film with impaired appearance and optical characteristics can be obtained.
- the measuring method of the storage elastic modulus (G ') and loss tangent (tan-delta) of the said ultraviolet curable adhesive film is described in the Example mentioned later.
- the value of the storage elastic modulus (G ′) at 60 ° C. of the ultraviolet curable pressure-sensitive adhesive film is preferably 5 ⁇ 10 4 Pa or more and less than 1.5 ⁇ 10 5 Pa from the viewpoint of step following ability, and loss.
- the value of tangent (tan ⁇ ) is preferably in the range of 0.5 to 1 and more preferably in the range of 0.7 to 0.95 from the viewpoint of resistance to bubble entrainment.
- the value of the storage elastic modulus (G ′) at 80 ° C. of the ultraviolet curable pressure-sensitive adhesive film is preferably less than 1.5 ⁇ 10 5 Pa from the viewpoint of step following ability, and is 1 ⁇ 10 4 Pa or more and 1 ⁇ 10 5 Pa. More preferably, the loss tangent (tan ⁇ ) value is preferably 1 or less, more preferably in the range of 0.7 to 1, from the viewpoint of step following ability and bubble entrainment resistance. .
- UV curable pressure-sensitive adhesive composition in order to obtain a pressure-sensitive adhesive film having excellent step following property and bubble entrainment resistance, it is preferable to use a crosslinkable material, for example, polyol (a1), urethane (meta).
- a crosslinkable material for example, polyol (a1), urethane (meta).
- the former ultraviolet curable pressure-sensitive adhesive composition from the viewpoint that production stability and performance stability can be further improved.
- polyether polyol for example, polyether polyol, polycarbonate polyol, polyester polyol, polybutadiene polyol, hydrogenated polybutadiene polyol, polyacryl polyol, dimer diol, polyisoprene polyol and the like can be used.
- These polyols may be used alone or in combination of two or more.
- polyether polyol examples include polyoxyethylene polyol, polyoxypropylene polyol, polyoxytetramethylene polyol, polyoxyethylene polyoxypropylene polyol, polyoxyethylene polyoxytetramethylene polyol, polyoxypropylene polyoxytetramethylene polyol. Etc. can be used. These polyether polyols may be used alone or in combination of two or more. Among these, from the viewpoint of moist and heat whitening resistance, flexibility, mechanical strength, and bubble entrapment resistance, one or more polysiloxanes selected from the group consisting of polyoxyethylene polyol, polyoxypropylene polyol, and polyoxytetramethylene polyol are used. It is preferable to use an ether polyol.
- polycarbonate polyol for example, those obtained by reacting a carbonate ester and / or phosgene with a compound having two or more hydroxyl groups can be used.
- carbonate ester for example, methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate and the like can be used. These carbonates may be used alone or in combination of two or more.
- Examples of the compound having two or more hydroxyl groups include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, and tripropylene glycol.
- An alicyclic polyol such as 1,2-cyclobutanediol, 1,3-cyclopentanediol, 1,4-cyclohexanedimethanol, cycloheptanediol, cyclooctanediol, hydroxypropylcyclohexanol; bisphenol A, Aromatic polyols such as bisphenol F and 4,4′-biphenol can be used. These compounds may be used alone or in combination of two or more.
- an aliphatic polyol and / or an alicyclic polyol is preferably used from the viewpoint that the cutting property can be further improved, and 1,4-butanediol, 1,5-pentane is preferable. It is more preferable to use one or more compounds selected from the group consisting of diol, 1,6-hexanediol, and 1,4-cyclohexanedimethanol.
- the polyol (a1) is used in an amount of 0.5 to 100 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (A) from the viewpoints of moisture and heat whitening resistance, flexibility, mechanical strength, and resistance to bubble entrainment.
- the range is preferably 30 parts by mass, and more preferably 3 to 20 parts by mass.
- the number average molecular weight of the polyol (a1) is preferably in the range of 500 to 7,000, from 700 to 4,000, from the viewpoints of heat-and-moisture whitening resistance, flexibility, mechanical strength and resistance to bubble entrainment. Is more preferable, and a range of 800 to 3,000 is even more preferable.
- the number average molecular weight of the said polyol (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 urethane (meth) acrylate (A) can be obtained, for example, by reacting the polyol (a′1), the polyisocyanate (a2), and the (meth) acrylic compound (a3) having an isocyanate group or a hydroxyl group. Things can be used.
- the same polyol (a1) as the polyol (a1) can be used.
- These polyols may be used alone or in combination of two or more.
- polyisocyanate (a2) examples include aromatic polyisocyanates such as xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, and naphthalene diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, 4,4 Aliphatic or alicyclic polyisocyanates such as' -dicyclohexylmethane diisocyanate, diisocyanate methylcyclohexane, and tetramethylxylylene diisocyanate can be used.
- aromatic polyisocyanates such as xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, and naphthalene diisocyanate
- polyisocyanates may be used alone or in combination of two or more.
- alicyclic polyisocyanates are preferably used from the viewpoint of further improving mechanical strength, adhesive properties and transparency, and 4,4′-dicyclohexylmethane diisocyanate, isophorone diisocyanate, cyclohexane diisocyanate and diisocyanate. It is more preferable to use one or more polyisocyanates selected from the group consisting of methylcyclohexane.
- the (meth) acrylic compound (a3) having an isocyanate group or a hydroxyl group is used for the purpose of introducing a (meth) acryloyl group into the urethane (meth) acrylate (A).
- (meth) acryl means acryl and / or methacryl
- (meth) acrylate means acrylate and / or methacrylate
- (meth) acryloyl means acryloyl. And / or methacryloyl.
- Examples of the (meth) acrylic compound having an isocyanate group that can be used as the compound (a3) 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. These compounds may be used alone or in combination of two or more.
- 2- (meth) acryloyloxyethyl isocyanate is preferably used from the viewpoint of easy availability of raw materials, and 2-acryloyloxyethyl isocyanate is more preferably used from the viewpoint of ultraviolet curability.
- Examples of the (meth) acrylic compound having a hydroxyl group that can be used as the compound (a3) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, (Meth) acrylic acid alkyl ester having a hydroxyl group such as 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, hydroxyethylacrylamide; trimethylolpropane di (meth) Polyfunctional (meth) acrylate having a hydroxyl group such as acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate; polyethylene glycol monoacrylate, And the like can be used polypropylene glycol monoacrylate.
- These compounds may be used alone or in combination of two or more.
- an acrylic acid (meth) alkyl ester having a hydroxyl group from the viewpoint of easy availability of raw materials, UV curable properties and adhesive properties, and 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate are used. It is more preferable.
- urethane (meth) acrylate (A) in the case of using a (meth) acryl compound having an isocyanate group as the compound (a3), for example, the polyol (a1) and the polyisocyanate (in the absence of a solvent) a urethane prepolymer having a hydroxyl group is obtained by charging and reacting with a2), and then the (meth) acrylic compound (a3) having an isocyanate group is supplied, mixed, and reacted to be used. be able to. In any case, the reaction is preferably carried out under a condition of 20 to 120 ° C. for about 30 minutes to 24 hours.
- the said urethane (meth) acrylate (A) in the case of using the (meth) acryl compound which has a hydroxyl group as the said compound (a3), the said polyol (a1) and the said (meth) under solvent-free, for example.
- a method in which an acrylic compound (a3) is charged into a reaction system and then the polyisocyanate (a2) is supplied, mixed, and reacted, or the polyol (a1) and the polyisocyanate are prepared without solvent.
- a urethane prepolymer having an isocyanate group is obtained by reacting with (a2), and then the (meth) acrylic compound (a3) 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 production of the urethane (meth) acrylate (A) may be performed in the presence of an organic solvent (C) described later.
- reaction may be carried out 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 (A). .
- reaction may be carried out 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 (A). .
- Examples of the urethane (meth) acrylate (A ′) having a hydroxyl group include an isocyanate group by reacting the polyol (a1), the polyisocyanate (a2), and the (meth) acrylic compound (a3).
- an isocyanate group by reacting the polyol (a1), the polyisocyanate (a2), and the (meth) acrylic compound (a3).
- urethane (meth) acrylate (A) and (A ′) when producing the urethane (meth) acrylate (A) and (A ′), 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. These polymerization inhibitors may be used alone or in combination of two or more.
- the urethanization catalyst examples include nitrogen-containing compounds such as triethylamine, triethylenediamine, and N-methylmorpholine; metal salts such as potassium acetate, zinc stearate, and tin octylate; dibutyltin laurate, zirconium tetraacetylacetonate, and the like. These organometallic compounds can be used. These urethanization catalysts may be used alone or in combination of two or more.
- the urethane (meth) acrylate (A) and (A ′) have a (meth) acryloyl group that allows radical polymerization to proceed by light irradiation or heating.
- the (meth) acryloyl group equivalent of the urethane (meth) acrylate (A) is 1,000 to 200,000 g / eq. From the viewpoint that the adhesive physical properties, the step following property and the bubble entrainment resistance can be further improved. In the range of 3,000 to 100,000 g / eq. The range of 5,000 to 80,000 g / eq. The range of is more preferable.
- the said (meth) acryloyl group equivalent is the (meth) acryl group which exists in the said urethane (meth) acrylate (A) for the total mass of the raw material of the said urethane (meth) acrylate (A) and (A '). The value divided by the equivalent of is shown.
- the cutting property, the adhesive physical property, and the step following property can be further improved, so that the urethane (meth) acrylate (A)
- the total amount is preferably 4 to 20% by mass, more preferably 5 to 15% by mass.
- the urethane bond amount of the urethane (meth) acrylate (A) is the mass ratio of the urethane bond structure in the raw material to the total mass of the raw materials of the urethane (meth) acrylate (A) and (A ′). Show.
- the urethane (meth) acrylates (A) and (A ′) have a weight average molecular weight in the range of 5,000 to 100,000 from the viewpoint of further improving cutting properties, adhesive physical properties, and step following properties. The range of 15,000 to 50,000 is more preferable.
- the weight average molecular weight of the said urethane (meth) acrylate (A) and (A ') shows the value obtained by measuring similarly to the number average molecular weight of the said polyol (a1).
- the polyisocyanate cross-linking agent (B) is cross-linked with the hydroxyl group of the polyol (a1) or the urethane (meth) acrylate (A ′) having a hydroxyl group to obtain good step following ability and bubble entrainment resistance, and It is preferable to use the ultraviolet curable pressure-sensitive adhesive film at 60 to 80 ° C. in terms of easy adjustment of the storage elastic modulus and loss tangent to the ranges specified in the present invention.
- tolylene diisocyanate chlorophenylene diisocyanate, hexamethylene Polyisocyanates such as diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate; these trimethylolpropane adducts; these isocyanurates Body; and the like can be used these biuret.
- These polyisocyanate crosslinking agents may be used alone or in combination of two or more.
- the said polyisocyanate crosslinking agent (B) As a usage-amount of the said polyisocyanate crosslinking agent (B), it is 0.1 with respect to 100 mass parts of said urethane (meth) acrylate (A) or (A ') from the point of level
- the range is preferably from 10 to 10 parts by mass, and more preferably from 0.5 to 5 parts by mass.
- organic solvent (C) examples include toluene, ethyl acetate, butyl acetate, methyl ethyl ketone, hexane, acetone, cyclohexanone, 3-pentanone, acetonitrile, propionitrile, isobutyronitrile, valeronitrile, dimethyl sulfoxide, dimethylformamide. Etc. can be used. These organic solvents may be used alone or in combination of two or more.
- the amount of the organic solvent (C) used is preferably 60% by mass or less in the ultraviolet curable pressure-sensitive adhesive composition from the viewpoint that the drying property and coating property can be further improved. A range is more preferred.
- the photopolymerization initiator (D) generates radicals by light irradiation, heating, or the like, and initiates radical polymerization of the urethane (meth) acrylate (A).
- Examples of the photopolymerization initiator (D) include 4-phenoxydichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and 1- (4-isopropylphenyl) -2.
- photopolymerization initiator (D) 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 4,6-trimethylbenzoyldiphenylphosphine oxide and one or more photopolymerization initiators selected from the group consisting of bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide are preferably used. 6-trimethylbenzoyldiphenylphosphine oxide is more preferred.
- the photopolymerization initiator (D) is used in an amount of 0.01 to 20 with respect to 100 parts by mass of the urethane (meth) acrylate (A) or (A ′) because the curability can be further improved.
- the range of parts by mass is preferable, and the range of 0.1 to 15 parts by mass is more preferable.
- the ultraviolet curable adhesive composition of the present invention may contain other additives as necessary.
- the other additives include a silane coupling agent, an antioxidant, a light stabilizer, a rust inhibitor, a thixotropic agent, a sensitizer, a polymerization inhibitor, a leveling agent, a tackifier, and an antistatic agent.
- a flame retardant or the like can be used.
- These additives may be used alone or in combination of two or more.
- a silane coupling agent when the ultraviolet curable pressure-sensitive adhesive composition of the present invention is used for applications requiring high pressure-sensitive adhesive properties after heat and humidity resistance, it is preferable to contain a silane coupling agent.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention when used for applications requiring high heat and heat yellowing resistance, it preferably contains an antioxidant and a light stabilizer.
- silane coupling agent examples include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropylmethyldimethoxysilane.
- Silane coupling agents having an epoxy group such as 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) propylmethyldimethoxy Syrah Silane coupling agents having an alicyclic epoxy group such as 2- (3,4-epoxycyclohexyl) propyltriethoxysilane and 2- (3,4-epoxycyclohexyl) propylmethyldiethoxysilane; vinyltrichlorosilane,
- silane coupling agents may be used alone or in combination of two or more.
- a silane coupling agent having an epoxy group and / or a silane coupling agent having an alicyclic epoxy group from the viewpoint that the adhesive strength after heat and humidity resistance can be further improved.
- the amount used in the case of using the silane coupling agent is 0 with respect to 100 parts by mass of the urethane (meth) acrylate (A) or (A ′) because the adhesive strength after heat and moisture resistance can be further improved.
- the range is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass, and still more preferably 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). Agent) and the like.
- hindered phenol compound examples include triethylene glycol-bis- [3- (3-tert-butyl-5-methyl-4hydroxyphenyl) propionate], pentaerythritol tetrakis [3- (3,5-di-).
- Examples of the phosphorus compound include triphenylphosphine, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite, triphenyl phosphite, trisnonylphenyl phosphite, tris (2,4- Dibutylphenyl) phosphite, tris (2,4-dibutyl-5-methylphenyl) phosphite, tris [2-tert-butyl-4- (3-butyl-4-hydroxy-5-methylphenylthio) -5 Methylphenyl] phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tridecylphosphite, octyldiphenylphosphite, di (decyl) monophenylphosphite, di (tridecyl) pentaerythri
- 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
- triphenylphosphine bis (2,4-di-tert-butyl-6-methylphenyl) ethylphosphine is preferable. More preferably, one or more antioxidants selected from the group consisting of fit and tris (2,4-di-tert-butylphenyl) phosphite are used, and triphenylphosphine, bis (2,4-di-tert) are used. More preferably, -butyl-6-methylphenyl) ethyl phosphite is used.
- the amount used in the case of using the antioxidant is from 0.01 to 100 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (A) or (A ′) from the viewpoint of further improving wet heat yellowing resistance.
- the range is preferably 10 parts by mass.
- 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
- These light stabilizers may be used alone or in combination of two or more. Among these, it is preferable to use a hindered amine compound from the viewpoint that the heat and heat yellowing resistance can be further improved.
- hindered amine compound examples include a reaction between cyclohexane and N-butyl-2,2,6,6-tetramethyl-4-piperidineamine-2,4,6-trichloro-1,3,5-triazine peroxide.
- N-acetyl hindered amine compounds bis (1,2,2,6,6-pentamethyl-4-piperidyl) decanedioate, (1,2,2,6,6, -pentamethyl-4-piperidyl) [ ⁇ 3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl ⁇ methyl] butyl malonate, dimethyl succinate 1- (2-Hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, Provandioic acid [ ⁇ 4-methoxyphenyl ⁇ methylene] -bis (1,2,2, 6,6-pentamethyl-4-piperidyl) ester N-alkyl hindered amine compounds and the like can be used. These compounds may be used alone or in combination of two or more.
- the amount used in the case of using the light stabilizer is from 0.01 to 100 parts by mass with respect to 100 parts by mass of the urethane (meth) acrylate (A) or (A ′) from the viewpoint of further improving wet heat yellowing resistance.
- the range is preferably 10 parts by mass.
- the viscosity of the ultraviolet curable pressure-sensitive adhesive composition of the present invention is preferably in the range of 500 to 30,000 mPa ⁇ s, and preferably 1,000 to 20,000 mPa ⁇ s from the viewpoint of coating properties and workability. A range is more preferred.
- the said viscosity shows the value measured with the B-type viscometer at 25 degreeC.
- the adhesive film can be obtained through a step of drying the organic solvent (C) in the ultraviolet curable adhesive composition and a step of curing the composition by irradiating with ultraviolet rays.
- the organic solvent (C) is dried.
- a method is used in which an ultraviolet curable adhesive film is obtained, and then the adhesive layer of the ultraviolet curable adhesive film is attached to a substrate, heated at, for example, 60 to 80 ° C., and then irradiated with ultraviolet rays. It is preferable to do.
- a substrate having a step such as a printing step is used as a base material to be bonded thereafter to the UV curable adhesive film before UV curing, no gap is left in the step portion.
- the adhesive film which is excellent in level
- trackability can be obtained.
- the step following property in the present invention is excellent, and the step having a thickness of 1 / 1.5 to 1/3, more preferably 1/2 to 1/3 with respect to the thickness of the pressure-sensitive adhesive layer. It is also effective against In the prior art, the step following ability with respect to the thickness of about 1/5 to 1/10 with respect to the thickness of the pressure-sensitive adhesive layer has been discussed, so this effect is very excellent.
- the state after organic solvent drying and before UV curing is referred to as “ultraviolet curing adhesive film”, and the state after UV curing is referred to as “adhesion film”.
- the base material for example, a plastic base material, a flexible print base material, a glass base material, a base material obtained by subjecting these base materials to a mold release treatment, a base material obtained by vapor deposition of ITO (indium tin oxide), or the like is used. Can do.
- the same base material may be used for both surfaces of the adhesion layer, or different base materials may be used.
- plastic substrate examples include acrylic resin, PC (polycarbonate), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), modified PPE (polyphenylene ether), PET (polyethylene terephthalate), COP (cycloolefin polymer),
- TAC triacetylcellulose
- an antireflection film, an antifouling film, a transparent conductive film constituting a touch panel, or the like can be used.
- Examples of a method of applying the ultraviolet curable pressure-sensitive adhesive composition to the substrate include a method of applying using an applicator, a roll coater, a knife coater, a gravure coater and the like. After the coating, the obtained laminate is put into a dryer or the like and dried at a temperature of 50 to 130 ° C. for 1 to 30 minutes to dry the organic solvent (C). An ultraviolet curable adhesive film is obtained.
- both After affixing the obtained ultraviolet curable adhesive film to the substrate, both may be pressure-bonded and subjected to autoclaving as necessary.
- an adhesive film is obtained by irradiating with ultraviolet rays.
- the method of irradiating with ultraviolet rays include known ultraviolet light irradiation devices such as a xenon lamp, a xenon-mercury lamp, a metal halide lamp, a high-pressure mercury lamp, and a low-pressure mercury lamp. The method using is mentioned.
- the irradiation dose of the ultraviolet 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 Good.
- the irradiation amount of ultraviolet rays is based on a value measured in a wavelength range of 300 to 390 nm using a UV checker “UVR-N1” manufactured by GS Yuasa Corporation.
- the thickness of the pressure-sensitive adhesive film obtained by the above method is appropriately determined according to the intended use, but is preferably in the range of about 10 to 500 ⁇ m.
- the storage elastic modulus in 30 degreeC is 1 * 10 ⁇ 4 > Pa or more when measured at a frequency of 1 Hz from the point which can further improve level
- the measuring method of the storage elastic modulus of the said adhesive film is described in an Example.
- the storage elastic modulus in 80 degreeC and 100 degreeC is 1 * 10 ⁇ 4 > Pa or more when measured at a frequency of 1 Hz from the point which can further improve level
- the measuring method of the storage elastic modulus of the said adhesive film is described in an Example.
- the pressure-sensitive adhesive film obtained by drying and irradiating with the ultraviolet curable pressure-sensitive adhesive composition of the present invention is excellent in step following ability and moisture and heat whitening resistance, and has no adhesive residue on the blade at the time of cutting and has excellent cutting properties. is there.
- UV curable adhesive film before UV irradiation has moderate strength due to thermal crosslinking, so it does not flow during heating, does not entrain air bubbles, protrude adhesive, and cause non-uniform film thickness. The optical characteristics are not adversely affected.
- the ultraviolet curable pressure-sensitive adhesive composition of the present invention can be suitably used as a pressure-sensitive adhesive used for optical members, and in particular, touch panels, liquid crystal displays, plasma displays, organic EL, personal computers, mobile phones and the like. It can be suitably used for manufacturing IT-related products.
- urethane acrylate (A-1) had an acryloyl group equivalent of 63,000 (rounded to the nearest two significant digits.
- the molecular weight of 2-hydroxyethyl acrylate was 116.1. The same applies hereinafter), weight average The molecular weight was 29,000.
- Example 1 ⁇ Preparation of UV-curable adhesive composition> A reaction vessel equipped with a stirrer, a reflux condenser, and a thermometer was heated to a temperature of 80 ° C., and 100 parts by mass of the urethane acrylate (A-1), 10 parts by mass of PPG2000, and an isocyanate cross-linking agent (B). 10 parts by weight of trimethylolpropane adduct of isocyanate (“Takenate D-110N” manufactured by Mitsui Chemicals, hereinafter abbreviated as “D-110N”) and 93 parts by weight of ethyl acetate were added and stirred until uniform. .
- D-110N trimethylolpropane adduct of isocyanate
- Examples 2 to 3, Comparative Example 1 An ultraviolet curable pressure-sensitive adhesive composition was obtained in the same manner as in Example 1 except that the type and / or amount of the isocyanate crosslinking agent (B) used was changed as shown in Table 1.
- UV curable adhesive film UV curable pressure-sensitive adhesives obtained in Examples and Comparative Examples so that the film thickness after drying the organic solvent is 100 ⁇ m on the surface of a 50 ⁇ m-thick polyethylene terephthalate film (release PET 50) having a release treatment on the surface.
- the fat composition was applied and dried in an 80 ° C. drier for 5 minutes to obtain an ultraviolet curable adhesive film.
- the ultraviolet curable adhesive film was bonded to a polyethylene terephthalate film (PET100) having a thickness of 100 ⁇ m to prepare an adhesive film in which PET100 was bonded to one side. What cut
- PET100 polyethylene terephthalate film
- TKA-100 isocyanurate of hexamethylene diisocyanate
- P301-75E trimethylolpropane adduct of hexamethylene diisocyanate
- the pressure-sensitive adhesive film of the present invention was excellent in step following ability and bubble entrainment resistance.
- Comparative Example 1 is an embodiment in which the value of the loss tangent (tan ⁇ ) at 60 to 80 ° C. of the UV curable adhesive film exceeds 1, but the UV curable adhesive film follows the step by pressure. The air bubbles in the voids that were generated when the substrate was attached to the base material were mixed into the pressure-sensitive adhesive layer, resulting in poor bubble resistance.
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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(A-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、ポリプロピレングリコール(数平均分子量;2,000、以下「PPG2000」と略記する。)を46.2質量部、ポリカーボネートポリオール(宇部興産株式会社製「ETERNACOLL UM-90(3/1)」、1,4-ジメタノールシクロヘキサン、1,6-ヘキサンジオール及び炭酸ジメチルを反応させたもの、数平均分子量900、以下「UM-90」と略記する。)を39.1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。)0.18質量部、2,6-ジ-ターシャリーブチル-クレゾールを0.3質量部、p-メトキシフェノール0.05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。)14.4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(A-1)を得た。得られたウレタンアクリレート(A-1)は、アクリロイル基の当量が63,000(有効数字2桁に四捨五入。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29,000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を容器内温度80℃に温め、前記ウレタンアクリレート(A-1)100質量部、PPG2000を10質量部、イソシアネート架橋剤(B)として、キシリレンジイソシアネートのトリメチロールプロパン付加物(三井化学株式会社製「タケネートD-110N」、以下、「D-110N」と略記する。)を10質量部、酢酸エチル93質量部を入れ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ジフェニル-フォスフィンオキサイド(以下、「(D-1)」と略記する。)を0.5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)エステルを0.5質量部、トリフェニルフォスフィン0.5質量部を順次添加し、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。
用いるイソシアネート架橋剤(B)の種類及び/又は量を表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、有機溶剤乾燥後の膜厚が100μm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、80℃乾燥機中で5分間乾燥させて紫外線硬化型粘着フィルムを得た。
前記紫外線硬化型粘着フィルムを、厚さ100μmのポリエチレンテレフタラートフィルム(PET100)に貼り合せ、片面にPET100が貼り合わされた粘着フィルムを作製した。これを縦50mm、横40mmに裁断したものを試験片とした。これとは別に、PET50から縦40mm、横30mm、幅5mmの枠を裁断した。この厚さ50μmの枠をガラス板上に置き、その上から前記試験片を2kgロール×2往復して、PET100と試験片とで前記厚さ50μmの枠を挟むように貼り付けた。これを、60℃、0.5MPaの条件下で20分間オートフレーブ処理した。その後、ガラス板側からガラス板投下後のUV-A領域の波長の積算光量が1J/cm2となるように紫外線照射し、粘着フィルムを有する積層体を得た。得られた積層体を80℃雰囲気下で24時間放置し、厚さ50μmの枠の内側部分を目視にて観察し、耐気泡巻き込み性と50μmの段差に対する追従性を以下のように評価した。
<耐気泡巻き込み性>
「T」:気泡の巻き込みがない。
「F」:気泡の巻き込みがある。
<段差追従性>
「T」:段差からの浮きがない。
「F」:段差からの浮きがある。
前記紫外線硬化型粘着フィルムの粘着層を遮光下にて厚さ1mmになるまで重ね合わせて試験片とした。得られた試験片をARES粘弾性測定装置(ティー・エイ・インスツルメント・ジャパン株式会社製)を用いて、昇温速度2℃/分、測定周波数1Hz、温度範囲;0~100℃、歪み;0.5%の条件にて測定した。
前記[紫外線硬化型粘着フィルム(紫外線照射前)の貯蔵弾性率の測定方法]と同様の測定方法で、貯蔵弾性率(G’)、損失弾性率(G’’)を測定し、下記計算式により損失正接(tanδ)を算出した。
損失正接(tanδ)=G’’/G’ (1)
前記[カッティング性の評価方法]にて得られた粘着フィルムを厚さ1mmになるまで重ね合わせて試験片とした。得られた試験片をARES粘弾性測定装置(ティー・エイ・インスツルメント・ジャパン株式会社製)を用いて、昇温速度2℃/分、測定周波数1Hz、温度範囲;0~100℃、歪み;0.5%の条件にて測定した。
「TKA-100」;ヘキサメチレンジイソシアネートのイソシアヌレート体(旭化成ケミカルズ株式会社製「デュラネートTKA-100」)
「P301-75E」;ヘキサメチレンジイソシアネートのトリメチロールプロパン付加体(旭化成ケミカルズ株式会社製「デュラネートP301-75E」)
Claims (8)
- 有機溶剤(C)を含有する紫外線硬化型粘着剤組成物であり、前記紫外線硬化型粘着剤組成物を基材に塗工した後に、有機溶剤(C)を乾燥して得られる紫外線照射前の紫外線硬化型粘着フィルムの60~80℃における貯蔵弾性率(G’)の値が1.5×105Pa未満であり、かつ損失正接(tanδ)の値が1以下であることを特徴とする紫外線硬化型粘着剤組成物。
- 前記紫外線硬化型粘着剤組成物が、ポリオール(a1)、ウレタン(メタ)アクリレート(A)、ポリイソシアネート架橋剤(B)、有機溶剤(C)、及び、光重合開始剤(D)を含有するものである請求項1記載の紫外線硬化型粘着剤組成物。
- 前記ウレタン(メタ)アクリレート(A)が、ポリオール(a’1)、ポリイソシアネート(a2)、及び、イソシアネート基又は水酸基を有する(メタ)アクリル化合物(a3)を反応して得られるものである請求項2記載の紫外線硬化型粘着剤組成物。
- 前記ポリオール(a’1)が、ポリエーテルポリオール及びポリカーボネートポリオールである請求項3記載の紫外線硬化型粘着剤組成物。
- 前記ポリイソシアネート架橋剤(B)が、ポリイソシアネートのトリメチロールプロパン付加物及び/又はポリイソシアネートのイソシアヌレート体である請求項2記載の紫外線硬化型粘着剤組成物。
- 前記ウレタン(メタ)アクリレート(A)の(メタ)アクリロイル基当量が、1,000~200,000g/eq.の範囲である請求項2記載の紫外線硬化型粘着剤組成物。
- 請求項1~6のいずれか1項記載の紫外線硬化型粘着剤組成物を基材に塗工した後に、有機溶剤(C)を乾燥して紫外線硬化型粘着フィルムを得、次いで、該紫外線硬化型粘着フィルムの粘着層を基材に貼り付けて加温し、その後紫外線照射することにより得られることを特徴とする粘着フィルム。
- 前記紫外線硬化型粘着フィルムの粘着層を貼り付ける基材が、段差を有するものである請求項7記載の粘着フィルム。
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JP2018053212A (ja) * | 2016-09-30 | 2018-04-05 | 日立化成株式会社 | 粘着フィルム |
CN109423215A (zh) * | 2017-08-30 | 2019-03-05 | 琳得科株式会社 | 无溶剂型粘着性组合物、粘着片以及显示体 |
JP2021100991A (ja) * | 2019-12-24 | 2021-07-08 | 理想科学工業株式会社 | 接着剤、感熱スクリーンマスター及び感熱スクリーンマスターの製造方法 |
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KR101855041B1 (ko) * | 2017-04-28 | 2018-06-14 | 동우 화인켐 주식회사 | 광학투명점착시트, 이를 제조하기 위한 조성물 및 이를 이용한 평판표시장치 |
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- 2015-05-26 WO PCT/JP2015/065037 patent/WO2016002388A1/ja active Application Filing
- 2015-05-26 KR KR1020167033562A patent/KR20170008243A/ko not_active Application Discontinuation
- 2015-05-26 CN CN201580029409.9A patent/CN106414645B/zh active Active
- 2015-06-25 TW TW104120411A patent/TW201604262A/zh unknown
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KR20170108609A (ko) * | 2016-03-18 | 2017-09-27 | 주식회사 엘지화학 | 광학용 점착제 조성물 및 광학 장치 |
KR102087427B1 (ko) * | 2016-03-18 | 2020-03-10 | 주식회사 엘지화학 | 광학용 점착제 조성물 및 광학 장치 |
JP2018053212A (ja) * | 2016-09-30 | 2018-04-05 | 日立化成株式会社 | 粘着フィルム |
CN109423215A (zh) * | 2017-08-30 | 2019-03-05 | 琳得科株式会社 | 无溶剂型粘着性组合物、粘着片以及显示体 |
JP2021100991A (ja) * | 2019-12-24 | 2021-07-08 | 理想科学工業株式会社 | 接着剤、感熱スクリーンマスター及び感熱スクリーンマスターの製造方法 |
Also Published As
Publication number | Publication date |
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CN106414645B (zh) | 2019-11-22 |
KR20170008243A (ko) | 2017-01-23 |
JPWO2016002388A1 (ja) | 2017-04-27 |
JP5896262B1 (ja) | 2016-03-30 |
TW201604262A (zh) | 2016-02-01 |
CN106414645A (zh) | 2017-02-15 |
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