WO2022255313A1 - 紫外線硬化性組成物 - Google Patents
紫外線硬化性組成物 Download PDFInfo
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- WO2022255313A1 WO2022255313A1 PCT/JP2022/021976 JP2022021976W WO2022255313A1 WO 2022255313 A1 WO2022255313 A1 WO 2022255313A1 JP 2022021976 W JP2022021976 W JP 2022021976W WO 2022255313 A1 WO2022255313 A1 WO 2022255313A1
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- curable composition
- meth
- weight
- acrylate
- ultraviolet curable
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- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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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
- 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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- 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
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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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
- 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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- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B2037/1253—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives curable adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/20—Chemical modification of a polymer leading to a crosslinking, either explicitly or inherently
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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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
- C09J2433/00—Presence of (meth)acrylic polymer
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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
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
Definitions
- the present invention relates to an ultraviolet curable composition which is excellent in printability, ultraviolet reactivity in the presence of oxygen, and adhesiveness at room temperature and high temperature.
- Adhesives are used for bonding electronic components inside electronic devices such as smartphones and PCs.
- a general method of bonding using an adhesive first, an adhesive sheet having separators arranged on both sides of the adhesive is produced, and then the adhesive sheet is cut into a desired shape. After that, one separator is peeled off from the cut pressure-sensitive adhesive sheet, one surface of the exposed pressure-sensitive adhesive is bonded to the first adherend, and then the other separator is peeled off, The other surface of the exposed pressure-sensitive adhesive is laminated to the second adherend.
- a part of the pressure-sensitive adhesive sheet is discarded after cutting, resulting in waste. Moreover, air bubbles sometimes entered the bonding surface.
- Patent Document 1 discloses a radiation-curable pressure-sensitive adhesive composition that enables fine patterning and exhibits high adhesion to various adherends such as metals and plastics.
- a radiation-curable adhesive composition containing 10 to 70% by weight of an ethylenically unsaturated monomer containing no aromatic ring, 1 to 10% by weight of a photopolymerization initiator, and 10 to 55% by weight of a cross-linking agent as an invention of , the aromatic ring-free ethylenically unsaturated monomer contains 10 to 45% by weight of an alkyl (meth)acrylate having an alkyl group having 8 to 18 carbon atoms, and the crosslinking agent has a weight average molecular weight of 20,000 to 100,000.
- describes a radiation-curable adhesive composition containing 10 to 50% by weight of a urethane poly(meth)acrylate of
- Patent Document 2 discloses an invention for providing a photocurable adhesive composition that provides a laminate having an adhesive strength equivalent to that in the absence of oxygen even when irradiated with light in the presence of oxygen.
- a photocurable adhesive composition is described comprising a 150° C. tackifier and (F) a liquid plasticizer.
- An object of the present invention is to provide an ultraviolet curable composition which is excellent in printability, ultraviolet reactivity in the presence of oxygen, and adhesiveness at room temperature and high temperature.
- the present disclosure 1 is an ultraviolet curable composition containing a curing component containing a (meth)acrylate monomer and a crosslinking component, and an ultraviolet curing agent, wherein the (meth)acrylate monomer is 100% by weight of the curing component It contains 50 to 85% by weight of a monomer whose homopolymer has a glass transition temperature of ⁇ 70° C. to ⁇ 30° C., and the composition is coated on a substrate in a thickness of 150 ⁇ m to seal the top surface of the coating.
- a cured product obtained by irradiating ultraviolet rays having a wavelength of 315 nm to 480 nm under the conditions of an irradiance of 90 mW/cm 2 and an irradiation amount of 1350 mJ/cm 2 in an atmospheric environment has a gel fraction of 0.4 to 78%. and a glass transition temperature of ⁇ 35° C. to 10° C., a reaction rate of 83% or more, and a reaction progress rate of the atmosphere side surface with respect to the substrate side surface of 93% or more.
- the present disclosure 2 is the ultraviolet curable composition of the present disclosure 1, further comprising a non-reactive component that does not have reactivity with the curing component.
- Disclosure 3 is the ultraviolet curable composition of Disclosure 2, which contains the non-reactive component in a ratio of 0.1 to 140 parts by weight with respect to 100 parts by weight of the curing component.
- This disclosure 4 is the ultraviolet curable composition of this disclosure 2 or 3, wherein the non-reactive component includes at least one of a thermoplastic resin and a tackifier.
- Present Disclosure 5 is the UV-curable composition according to any one of Present Disclosures 1 to 4, wherein both the air-side surface and the substrate-side surface of the cured product have a reaction rate of 80% or more.
- Present Disclosure 6 is the UV-curable composition according to any one of Present Disclosures 2 to 5, wherein the crosslinking component has reactivity with the curing component, or reacts with the curing component and the non-reactive component.
- the present disclosure 7 is the present disclosure 1, wherein the cross-linking component has at least one bonding functional group selected from the group consisting of an isocyanate group, an epoxy group, an aldehyde group, a hydroxyl group, an amino group, a (meth)acrylate group, and a vinyl group.
- Present Disclosure 8 is the UV-curable composition according to any one of Present Disclosures 1 to 7, wherein the crosslinking component comprises a (meth)acrylate monomer having a homopolymer gel fraction of 80% or more.
- the cross-linking component is a (meth)acrylate monomer having a viscosity of 10000 cps or more at 25 ° C.
- the present disclosures 1 to 8 in which 0.1 to 25 wt% is contained in 100 wt% of the curing component Is any UV curable composition.
- Present Disclosure 10 is the ultraviolet curable composition according to any one of Present Disclosures 1 to 9, wherein the content of the ultraviolet curing agent is 0.2 to 10 parts by weight with respect to 100 parts by weight of the curing component.
- Present Disclosure 11 is the ultraviolet curable composition of Present Disclosure 10, wherein the content of the ultraviolet curing agent is 0.4 to 5 parts by weight with respect to 100 parts by weight of the curing component.
- Disclosure 12 is the UV curable composition of any of Disclosures 1 to 11, wherein the curing component comprises a nitrogen-containing monomer.
- Present Disclosure 13 is the ultraviolet curable composition of Present Disclosure 12, wherein the content of the nitrogen-containing monomer is 5 to 33% by weight in 100% by weight of the curable component.
- This disclosure 14 is the ultraviolet curable composition of this disclosure 12 or 13, wherein the nitrogen-containing monomer includes a monomer having a lactam structure.
- Present Disclosure 15 is the UV-curable composition according to any one of Present Disclosures 1 to 14, wherein the cured product has a gel fraction of 15 to 67%.
- Present Disclosure 16 is the ultraviolet curable composition of any one of Present Disclosures 1 to 15, which is an ultraviolet curable composition for printing.
- Disclosure 17 is the UV curable composition of Disclosure 16 for use in screen printing or inkjet printing.
- Present Disclosure 18 is a pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer comprising the ultraviolet curable composition of any one of Present Disclosures 1 to 17 provided on at least one side of the base material.
- Present Disclosure 19 is the adhesive sheet of Present Disclosure 18, wherein the adhesive layer is partially disposed on the substrate.
- the present disclosure 20 is a laminate in which a first adherend and a second adherend are laminated via the adhesive layer contained in the adhesive sheet of the present disclosure 18 or 19.
- the method of applying the ultraviolet curable composition is inkjet printing, screen printing, spray coating, spin coating, gravure offset, or reverse offset printing, and the ultraviolet curable composition is the first 22 is a method of manufacturing a laminate of the present disclosure 21 that is partially applied onto an adherend of .
- the present invention will be described in detail below.
- the present inventors focused on an ultraviolet curable composition containing a curing component containing a (meth)acrylate monomer and a cross-linking component, and an ultraviolet curing agent. It has been found that it is difficult to obtain sufficient UV reactivity when the According to the studies of the present inventors, it was found that by including a specific amount of a monomer whose homopolymer has a glass transition temperature of ⁇ 30° C. to ⁇ 70° C., it is possible to improve the UV reactivity while ensuring adhesiveness. rice field. As a result of further studies, it was found that the resulting cured product had a reaction rate of 83% or higher, and adjustments were made so that the reaction progress rate of the atmosphere side surface with respect to the base material side surface was 93% or higher.
- the UV-curable composition contains a curing component including a (meth)acrylate monomer and a cross-linking component.
- (meth)acrylic means acrylic or methacrylic
- the above “(meth)acrylate monomer” means a monomer having a (meth)acryloyl group
- the above “(meth)acryloyl ” means acryloyl or methacryloyl.
- Examples of the (meth)acrylate monomers include (meth)acrylic acid ester compounds and epoxy (meth)acrylates.
- (meth)acrylate means acrylate or methacrylate
- epoxy(meth)acrylate means that all epoxy groups in an epoxy compound react with (meth)acrylic acid. It represents a compound that has undergone
- Examples of the above (meth)acrylic acid ester compounds that are monofunctional include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate.
- bifunctional ones include, for example, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexane Diol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate (Meth) acrylate, polyethylene glycol di (meth) acrylate, 2-n-butyl-2-ethyl-1,3-propanediol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) ) acrylate, polypropylene glycol di(meth)acrylate, neopen
- trifunctional or higher ones include, for example, trimethylolpropane tri(meth)acrylate, ethylene oxide-added trimethylolpropane tri(meth)acrylate, propylene oxide-added trimethylolpropane tri( meth)acrylate, caprolactone-modified trimethylolpropane tri(meth)acrylate, ethylene oxide-added isocyanuric acid tri(meth)acrylate, glycerin tri(meth)acrylate, propylene oxide-added glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, tris(meth)acryloyloxyethyl phosphate, ditrimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol penta(meth)acryl
- epoxy (meth)acrylate examples include bisphenol A type epoxy (meth)acrylate, bisphenol F type epoxy (meth)acrylate, bisphenol E type epoxy (meth)acrylate, and caprolactone modified products thereof.
- the (meth)acrylate monomer contains 50 to 85% by weight of a monomer having a homopolymer glass transition temperature (Tg) of ⁇ 70° C. to ⁇ 30° C. with respect to the total amount of the curing component.
- Tg homopolymer glass transition temperature
- the composition can obtain excellent adhesiveness while improving UV reactivity.
- a preferable lower limit of the monomer content is 60% by weight, and a more preferable upper limit is 77% by weight.
- the preferable lower limit of the glass transition temperature of the homopolymer is -50°C, and the more preferable upper limit is -35°C.
- the glass transition temperature of the homopolymer As the glass transition temperature of the homopolymer, the peak temperature of tan ⁇ in dynamic viscoelasticity measured in shear mode at a frequency of 1 Hz is used. Specifically, for example, the glass transition temperature of the homopolymer can be measured according to the following procedure. (Measurement of glass transition temperature of homopolymer) 100 parts by weight of a (meth)acrylate monomer and 0.2 parts by weight of a photopolymerization initiator are stirred and mixed to obtain a photopolymerizable composition. A photopolymerizable composition layer having a thickness of 100 ⁇ m is formed from the obtained photopolymerizable composition.
- a homopolymer cured product is prepared by irradiating the photopolymerizable composition layer with ultraviolet rays having an irradiation energy of 1350 mJ/cm 2 under the conditions of 30 mW/cm 2 of illumination at a wavelength of 365 nm and 60 mW/cm 2 of illumination at a wavelength of 405 nm.
- the viscoelasticity of the resulting homopolymer cured product was measured under the conditions of shear mode, temperature increase from ⁇ 100° C. to 200° C. at a temperature increase rate of 3° C./min, and frequency of 1 Hz and strain of 0.1%. do.
- the peak temperature of the loss tangent is defined as the glass transition temperature Tg (°C).
- a preferable lower limit of the content of the (meth)acrylate monomer in 100 parts by weight of the ultraviolet curable composition is 40 parts by weight, and a preferable upper limit thereof is 99 parts by weight.
- the content of the (meth)acrylate monomer is 40 parts by weight or more, the pressure-sensitive adhesive obtained has excellent adhesion at high temperatures.
- the content of the (meth)acrylate monomer is 99 parts by weight or less, the adhesion of the pressure-sensitive adhesive to various substrates and properties other than the adhesion can be made excellent.
- a more preferable lower limit for the content of the (meth)acrylate monomer is 55 parts by weight, and a more preferable upper limit is 90 parts by weight.
- the UV-curable composition contains a cross-linking component.
- the cross-linking component is not particularly limited as long as it is a compound having two or more bonding functional groups in one molecule. It preferably has reactivity with respect to non-reactive components.
- the cross-linking component preferably has at least one bonding functional group selected from the group consisting of isocyanate groups, epoxy groups, aldehyde groups, hydroxyl groups, amino groups, (meth)acrylate groups, and vinyl groups. Any material having these bonding functional groups can form cross-linked bonds with a sufficient density during curing.
- the cross-linking component preferably contains a (meth)acrylate monomer having a homopolymer gel fraction of 80% or more.
- a (meth)acrylate monomer having a homopolymer gel fraction of 80% or more.
- the cross-linking component preferably comprises a (meth)acrylate monomer having a viscosity of 10000 cps or more at 25° C.
- a high molecular weight monomer (macromonomer) may be used.
- the said crosslinking component contains a bifunctional (meth)acrylate monomer.
- cross-linking component examples include radically polymerizable polyfunctional oligomers or monomers, polymers having cross-linkable functional groups, and macromonomers.
- Examples of the radically polymerizable polyfunctional oligomer or monomer include trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol monohydroxypentaacrylate, and dipentaerythritol hexaacrylate.
- methacrylates similar to those described above may be used.
- Other examples include 1,4-butylene glycol diacrylate, 1,6-hexanediol diacrylate, polyethylene glycol diacrylate, commercially available oligoester acrylates, and methacrylates similar to those described above.
- These radically polymerizable polyfunctional oligomers or monomers may be used alone, or two or more of them may be used in combination.
- the content of the cross-linking component is preferably 0.1 to 25% by weight based on 100% by weight of the curing component.
- the content of the cross-linking component is within this range, the cohesive force of the UV-curable composition is moderately improved, and the printability of the composition and the adhesiveness of the resulting pressure-sensitive adhesive are improved.
- a more preferable lower limit of the content of the cross-linking component is 2% by weight, and a more preferable upper limit is 15% by weight.
- the UV-curable pressure-sensitive adhesive composition contains a UV-curing agent.
- a photoradical polymerization initiator is preferably used as the ultraviolet curing agent.
- the ultraviolet curing agent and photoradical polymerization initiator may be used alone, or two or more of them may be used in combination.
- radical photopolymerization initiator examples include benzophenone compounds, alkylphenone compounds, acylphosphine oxide compounds, titanocene compounds, oxime ester compounds, benzoin ether compounds, and thioxanthone compounds.
- alkylphenone compounds include acetophenone compounds.
- photoradical polymerization initiator examples include 1-hydroxycyclohexylphenyl ketone, 2-benzyl-2-(dimethylamino)-1-(4-(morpholino)phenyl)-1-butanone, 2- (Dimethylamino)-2-((4-methylphenyl)methyl)-1-(4-(4-morpholinyl)phenyl)-1-butanone, 2,2-dimethoxy-1,2-diphenylethan-1-one , bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 1-(4-(2-hydroxyethoxy) -phenyl)-2-hydroxy-2-methyl-1-propan-1-one, 1-(4-(phenylthio)phenyl)-1,2-octanedione 2-(O-benzoyloxime), 2,4, 6-trimethylbenzoyldiphenylphos
- the content of the ultraviolet curing agent has a preferable lower limit of 0.2 parts by weight and a preferable upper limit of 10 parts by weight with respect to 100 parts by weight of the curing component.
- the ultraviolet curable composition maintains excellent storage stability and is more excellent in ultraviolet curability.
- a more preferable lower limit of the content of the ultraviolet curing agent is 0.4 parts by weight, a more preferable upper limit is 8 parts by weight, a further preferable lower limit is 0.5 parts by weight, a further preferable upper limit is 6 parts by weight, and a particularly preferable upper limit is 5 parts by weight. Department.
- the content of the ultraviolet curing agent refers to the total content of all the ultraviolet curing agents contained.
- the ultraviolet curable composition may contain a nitrogen-containing monomer.
- the nitrogen-containing monomer is not particularly limited as long as it has a nitrogen atom in the molecule and a polymerizable group, but an amide compound having a vinyl group is preferable, and a cyclic amide compound having a vinyl group is more preferable.
- a compound having a lactam structure is more preferable.
- Examples of the amide compound having a vinyl group include N-vinylacetamide and (meth)acrylamide compounds.
- the (meth)acrylamide compounds include N,N-dimethyl(meth)acrylamide, N-(meth)acryloylmorpholine, N-hydroxyethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N -isopropyl (meth)acrylamide, N,N-dimethylaminopropyl (meth)acrylamide and the like.
- Examples of the cyclic amide compound having a vinyl group include compounds represented by the following formula (1).
- n an integer of 2-6.
- Examples of the compound represented by formula (1) include N-vinyl-2-pyrrolidone and N-vinyl- ⁇ -caprolactam. Among them, N-vinyl- ⁇ -caprolactam is preferred.
- the nitrogen-containing monomer preferably contains a monomer having a negative e value.
- the content of the nitrogen-containing monomer can be used to adjust the reaction rate in the cured product and the reaction progress rate of the air-side surface with respect to the substrate-side surface. It is preferable that the content of the nitrogen-containing monomer is 5 to 33% by weight. When the content of the nitrogen-containing monomer is 5% by weight or more, the ultraviolet reactivity in the presence of oxygen can be improved, the reaction rate in the cured product, and the air side surface with respect to the substrate side surface It becomes easy to adjust the reaction progress rate of to a desired range. When the content of the nitrogen-containing monomer is 33% by weight or less, the pressure-sensitive adhesive obtained has excellent adhesion to various substrates. A more preferable lower limit of the nitrogen-containing monomer content is 10% by weight, and a more preferable upper limit is 25% by weight.
- the UV-curable composition may contain a non-reactive component that does not have reactivity with the curing component.
- a non-reactive component a compound that does not contain a reactive double bond, or a compound that does not substantially show photopolymerization reactivity even if it has a reactive double bond can be used.
- the non-reactive component may exhibit reactivity to triggers such as heat and moisture after photopolymerization of the UV-curable composition. It may be cured, or an isocyanate compound may be contained and cured with moisture, alcohol, or the like.
- the non-reactive component preferably contains at least one of a thermoplastic resin and a tackifier.
- thermoplastic resin examples include solvent-free acrylic polymers and SEBS elastomers.
- the solvent-free acrylic polymer for example, a polymer of at least one monomer selected from (meth)acrylic acid alkyl esters having an alkyl group having 1 to 20 carbon atoms, or the monomer and other and copolymers with copolymerizable monomers.
- examples of commercial products of the solvent-free acrylic polymer include ARUFON-UP1000 series, UH2000 series, and UC3000 series manufactured by Toagosei Co., Ltd., and acrylic block copolymer Clarity LA series and LK series manufactured by Kuraray Co., Ltd. .
- tackifier examples include rosin-based resins and terpene-based resins.
- the rosin-based resin examples include rosin diol.
- the rosin diol is not particularly limited as long as it is a rosin-modified diol having two rosin skeletons and two hydroxyl groups in the molecule.
- a diol having a rosin component in the molecule is called a rosin polyol, and includes a polyether type such as polypropylene glycol (PPG) having a skeleton excluding the rosin component, a condensation polyester polyol, a lactone polyester polyol, There are polyester types such as polycarbonate diols.
- PPG polypropylene glycol
- polyester types such as polycarbonate diols.
- rosin diol examples include a rosin ester obtained by reacting a rosin with a polyhydric alcohol, an epoxy-modified rosin ester obtained by reacting a rosin with an epoxy compound, and a polyether having a rosin skeleton having a hydroxyl group. Modified rosin and the like can be mentioned. These can be produced by a conventionally known method.
- rosin component examples include abietic acid and its derivatives such as dehydroabietic acid, dihydroabietic acid, tetrahydroabietic acid, diabietic acid, neoabietic acid, levopimaric acid and other pimaric acid type resin acids, and water obtained by hydrogenating these.
- examples include added rosin, disproportionated rosin obtained by disproportionating these, and the like.
- commercially available rosin-based resins include, for example, Pine Crystal D-6011, KE-615-3, KR-614, KE-100, KE-311, KE-359, KE-604 manufactured by Arakawa Chemical Industries, Ltd. and D-6250.
- terpene-based resin examples include terpene-phenol-based resins.
- the terpene phenol resin is a copolymer of phenol and a terpene resin, which is an essential oil component obtained from natural products such as pine resin and orange peel, and is obtained by hydrogenating at least a part of the copolymer. Also included are partially hydrogenated terpene phenolic resins or fully hydrogenated fully hydrogenated terpene phenolic resins.
- the fully hydrogenated terpene phenol-based resin is a terpene-based resin (tackifying resin) obtained by substantially completely hydrogenating a terpene phenol-based resin
- the partially hydrogenated terpene phenol-based resin is It is a terpene-based resin (tackifying resin) obtained by partially hydrogenating a terpene-phenolic resin.
- the terpene phenol-based resin has a terpene-derived double bond and a phenol-derived aromatic ring double bond.
- fully hydrogenated terpene phenolic resin means a tackifying resin in which both the terpene moiety and the phenolic moiety are completely or almost hydrogenated
- partially hydrogenated terpene phenolic resin refers to those It means a terpene phenolic resin in which the degree of hydrogenation at the site is not complete but partial.
- the hydrogenation method and reaction format are not particularly limited. Examples of commercially available terpene phenolic resins include YS Polystar NH (completely hydrogenated terpene phenolic resin) manufactured by Yasuhara Chemical Co., Ltd., and the like.
- the non-reactive component may contain a plasticizer such as an organic ester, an organic phosphate, or an organic phosphite, or a liquid substance having an acid value such as xylene or polyol.
- a plasticizer such as an organic ester, an organic phosphate, or an organic phosphite, or a liquid substance having an acid value such as xylene or polyol.
- plasticizer examples include organic acid ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. . Among them, an organic acid ester plasticizer is preferable. These plasticizers may be used alone or in combination of two or more.
- Examples of the organic acid esters include monobasic organic acid esters and polybasic organic acid esters.
- the monobasic organic acid ester is not particularly limited.
- monobasic organic acids such as butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, n-octylic acid, 2-ethylhexylic acid, pelargonic acid (n-nonylic acid), decylic acid, and triethylene Glycol esters obtained by reaction with glycols such as glycol, tetraethylene glycol, tripropylene glycol and the like can be mentioned.
- the polybasic organic acid ester is not particularly limited. The obtained ester compound etc. are mentioned.
- organic acid esters include triethylene glycol-di-2-ethylbutyrate (3GH), triethylene glycol-di-2-ethylhexanoate (3GO), triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, triethylene glycol-di-n-heptanoate (3G7) and the like.
- tetraethylene glycol-di-n-heptanoate (4G7), tetraethylene glycol-di-2-ethylhexanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate , 1,3-propylene glycol di-2-ethylbutyrate and the like.
- 1,4-butylene glycol di-2-ethylbutyrate, diethylene glycol-di-2-ethylbutyrate, diethylene glycol-di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate and the like are mentioned. be done.
- triethylene glycol di-2-ethylpentanoate tetraethylene glycol-di-2-ethylbutyrate (4GH), diethylene glycol dicapriate, dihexyl adipate (DHA), dioctyl adipate, hexylcyclohexyl adipate, diisononyl adipate, and heptyl nonyl adipate.
- DHA dihexyl adipate
- dioctyl adipate hexylcyclohexyl adipate
- diisononyl adipate diisononyl adipate
- heptyl nonyl adipate heptyl nonyl adipate.
- Other examples include oil-modified alkyds of sebacate, mixtures of phosphate esters and adipate esters, and mixed adipate esters made from alkyl alcohols having 4 to 9
- Examples of the organic phosphate or organic phosphite include compounds obtained by a condensation reaction between phosphoric acid or phosphorous acid and alcohol. Among them, a compound obtained by a condensation reaction between an alcohol having 1 to 12 carbon atoms and phosphoric acid or phosphorous acid is preferable.
- Examples of the alcohol having 1 to 12 carbon atoms include methanol, ethanol, butanol, hexanol, 2-ethylbutanol, heptanol, octanol, 2-ethylhexanol, decanol, dodecanol, butoxyethanol, butoxyethoxyethanol, and benzyl alcohol. mentioned.
- organic phosphate or organic phosphite examples include trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tri(2-ethylhexyl) phosphate, tri(butoxyethyl) phosphate, tri(2-ethylhexyl) phosphite, isodecylphenyl phosphate, triisopropyl phosphate and the like.
- the content of the non-reactive component is preferably 0.1 to 140 parts by weight with respect to 100 parts by weight of the curing component. When the content of the non-reactive component is within this range, the viscosity of the UV-curable composition is improved, a thick coating film can be formed, and printability is excellent.
- a more preferable lower limit to the content of the non-reactive component is 10 parts by weight, and a more preferable upper limit is 90 parts by weight.
- the ultraviolet curable composition may contain an antifoaming agent.
- the antifoaming agent is not particularly limited, and examples thereof include silicone antifoaming agents, acrylic polymer antifoaming agents, vinyl ether polymer antifoaming agents, and olefin polymer antifoaming agents.
- the UV-curable composition further contains a viscosity modifier, a silane coupling agent, a sensitizer, a thermosetting agent, a curing retarder, an antioxidant, a storage stabilizer, Various known additives such as dispersants and fillers may be contained. Further, the UV-curable composition preferably does not substantially contain an organic solvent from the viewpoint of preventing a decrease in UV reactivity. It is preferable that the content of the organic solvent is 1.5% by weight or less.
- the above UV-curable composition is coated on a substrate with a thickness of 150 ⁇ m, and without sealing the coated upper surface, UV rays with a wavelength of 315 nm to 480 nm are applied at an irradiance of 90 mW / cm 2 in an atmospheric environment.
- the cured product obtained by irradiation under conditions of an irradiation amount of 1350 mJ/cm 2 has a gel fraction of 0.4 to 78%, a glass transition temperature of ⁇ 35° C. to 10° C., and a reaction rate of It is 83% or more, and the reaction progress rate of the atmosphere side surface with respect to the base material side surface is 93% or more.
- the base material a PET film whose surface has been subjected to a release treatment is preferably used.
- the above conditions are such that after coating the UV-curable composition on a base material, UV irradiation is performed in the presence of oxygen without covering the coating surface with a separator. Therefore, the air-side surface (surface) reflects UV reactivity in the presence of oxygen. On the other hand, since the coating film has a thickness of 150 ⁇ m, the surface facing the substrate (back surface) reflects UV reactivity in the absence of oxygen.
- the gel fraction of the cured product When the gel fraction of the cured product is 0.4 to 78%, cohesive force can be improved, excellent adhesiveness to various substrates at room temperature can be obtained, and high-temperature elasticity can be obtained. High modulus can be achieved and excellent high temperature tack can also be obtained.
- a preferable lower limit of the gel fraction of the cured product is 15%, and a preferable upper limit thereof is 67%.
- the gel fraction of the cured product can be adjusted by adjusting the content of the cross-linking component.
- the glass transition temperature of the cured product When the glass transition temperature of the cured product is ⁇ 35° C. to 10° C., the impact absorption can be excellent.
- the glass transition temperature of the cured product preferably has a lower limit of -30°C, a more preferred upper limit of 1°C, and a further preferred upper limit of -10°C.
- reaction rate of the cured product When the reaction rate of the cured product is 83% or more, the cohesive force of the cured product can be improved, and excellent adhesiveness can be obtained.
- a preferable upper limit of the reaction rate of the cured product is 100%.
- the reaction rate is a value calculated from the solid content ratio of the cured product.
- reaction progress rate of the atmosphere side surface with respect to the substrate side surface is 93% or more, the adhesion on the surface can be improved, and stable and excellent adhesiveness can be obtained.
- a preferable upper limit of the reaction progress rate is 100%.
- the reaction progress rate is calculated from the ratio of the solid content of the cured product and the reaction rate ratio of the front and back surfaces calculated from the IR spectra (infrared absorption spectra) obtained from the front and back surfaces of the cured product. value.
- the reaction rates of both the air-side surface (front surface) and the substrate-side surface (rear surface) of the cured product are 80% or more.
- the reaction rate of the air-side surface (surface) also referred to herein as “surface reaction rate” reflects the UV reactivity in the presence of oxygen
- the reaction rate of the substrate-side surface (back surface) (this In the specification, the "back surface reactivity") reflects the UV reactivity in the absence of oxygen. If a reaction rate of 80% or more is obtained on both the air-side surface (front surface) and the substrate-side surface (back surface), it can be said that the UV reactivity in the presence of oxygen is sufficiently high, and the composition is desired. It is possible to apply a method in which printing is performed in the shape of , and then bonding to the adherend is performed.
- both the front side reaction rate and the back side reaction rate are high.
- the back surface reaction rate is generally higher in the exposed state (in the presence of oxygen), and the surface reaction rate is higher in the sealed state (in the absence of oxygen).
- the surface reaction rate is high (that is, the reaction progress rate is high), it can be judged that the reaction proceeded appropriately even in the exposed state as in the sealed state.
- the surface reaction rate can be determined by optically measuring the structure derived from the monomer or the structure derived from the polymer in the cured product from the air side (front side).
- the back surface reaction rate can be determined by optically measuring the monomer-derived structure or polymer-derived structure in the cured product from the substrate side (back side).
- As the optical measurement for example, a method of determining the amount of vinyl groups in the cured product from the absorbance value at 810 cm ⁇ 1 in the IR spectrum obtained by the ATR method (attenuated total reflection) can be used. can.
- the reaction rate, the reaction progress rate, the front side reaction rate, and the back side reaction rate can be measured according to the following procedure.
- the UV-curable composition is applied with an applicator to a thickness of 150 ⁇ m on a single-sided release-treated PET sheet serving as a substrate.
- an ultraviolet irradiation apparatus was used to set a UV illuminance of 30 mW/cm 2 at a wavelength of 365 nm and a UV illuminance of 60 mW/cm 2 at a wavelength of 405 nm.
- the ultraviolet-curable composition is cured to obtain a cured product.
- FIG. 1 explains the sample preparation method and the measurement target, and FIG. It explains the method of calculating the surface reaction rate and the back surface reaction rate.
- a sample of the cured product prepared as described above (cured in an atmospheric environment without sealing the upper surface of the coating; see FIG. A sample (see FIG. 1(b)) prepared by irradiating ultraviolet rays (UV) in the same manner as for the cured product A except that the PET sheet 20 was sandwiched between the PET sheets 20 is referred to as a “cured product B”.
- reaction rate [%] 100 - (total weight of aluminum pan and sample after drying - weight of aluminum pan before drying) / (total weight of aluminum pan and sample before drying - weight of aluminum pan before drying) x 100
- the IR spectrum ( infrared absorption spectrum) shown in FIG. obtain.
- the obtained values are defined as “absorbance without PET (surface)” and “absorbance without PET (back surface)", respectively.
- the IR spectrum shown in FIG. 2 is similarly measured by the ATR method on the irradiated surface (surface) of the cured product B during curing to obtain an absorbance value of 810 cm ⁇ 1 .
- the obtained value is defined as "absorbance with PET (surface)". From these values and the reaction rate, the surface reaction rate, the back side reaction rate, and the reaction progress rate are calculated according to the following equations.
- reaction rate [%] reaction rate [%] x absorbance without PET (surface) / absorbance with PET (surface)
- Back side reaction rate [%] reaction rate [%] x absorbance without PET (back side) / absorbance with PET (front side)
- Reaction progress rate [%] absorbance without PET (surface) / absorbance without PET (back surface) ⁇ 100
- “absorbance without PET (surface) / absorbance with PET (surface)” and “absorbance without PET (back surface) / absorbance with PET (surface)” are obtained by measuring the UV-curable adhesive composition before curing.
- the reactivity to ultraviolet rays in the presence of oxygen may be increased so as to increase the surface reaction rate.
- Methods of increasing the surface reaction rate include, for example, increasing the blending amount of nitrogen-containing monomers, increasing the blending amount of the cross-linking component, and using a cross-linking component with a high homopolymer gel fraction (the homopolymer gel fraction is Examples include a method of using a high (meth)acrylate monomer), a method of using a large amount of an ultraviolet curing agent, and a method of increasing the amount of non-reactive components.
- the ultraviolet curable composition is preferably an ultraviolet curable composition for printing.
- the method for printing the ultraviolet curable composition is not particularly limited, and includes screen printing, inkjet printing, gravure printing, etc. Among them, screen printing and inkjet printing are preferably used. If an adhesive layer is formed by applying a desired pattern on an adherend (substrate) by printing, it can be compared to obtaining an adhesive in a desired shape by cutting a sheet-like adhesive immediately before bonding. Therefore, there is an advantage that the cutting work can be omitted. As a result, it is possible to suppress the generation of waste and reduce the environmental load.
- the viscosity of the UV-curable composition is not limited and is adjusted according to the application method.
- the viscosity at 25 ° C. ⁇ It is preferably a paste of s.
- a more preferable lower limit of the viscosity is 10 Pa ⁇ s, and a more preferable upper limit is 100 Pa ⁇ s.
- the reaction can be performed without containing a large amount of non-reactive components and high-viscosity cross-linking components. Therefore, the desired viscosity is adjusted. It is possible.
- the above viscosity is determined, for example, by using VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E-type viscometer, and using a cone plate of CP1 at a rotation speed of 1 to 100 rpm as appropriate from the optimum torque number in each viscosity region. can be measured by selecting VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E-type viscometer, and using a cone plate of CP1 at a rotation speed of 1 to 100 rpm as appropriate from the optimum torque number in each viscosity region. can be measured by selecting VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E-type viscometer, and using a cone plate of CP1 at a rotation speed of 1 to 100 rpm as appropriate from the optimum torque number in each viscosity region. can be measured by selecting VISCOMETER TV-22 (manu
- the method for preparing the ultraviolet curable composition is not particularly limited, for example, using a mixer, (meth) acrylate monomer, a crosslinking component, an ultraviolet curing agent, additives to be added as necessary, etc. and the like.
- the mixer include a homodisper, a homomixer, a universal mixer, a planetary mixer, a kneader, and three rolls.
- the above UV-curable composition forms an adhesive layer by curing with UV irradiation, and its usage method is to form an adhesive layer on a substrate (separator) and transfer it to an adherend.
- An adhesive sheet may be produced, or an adhesive layer may be formed directly on an adherend.
- the method of forming the adhesive layer directly on the adherend can minimize the number of times of bonding and prevent air bubbles from entering the interface during bonding.
- the method of forming the adhesive layer on the base material (separator) has the advantage that the adhesive layer is placed on the adherend by transfer, so there are few restrictions on construction.
- a pressure-sensitive adhesive sheet, a laminate, and a method for producing the laminate using the ultraviolet-curable composition will be described below.
- a pressure-sensitive adhesive sheet comprising a substrate and a pressure-sensitive adhesive layer comprising the ultraviolet-curable composition of the present invention provided on at least one side of the substrate is also one aspect of the present invention.
- a resin film is preferably used.
- Materials for the resin film include, for example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, acrylic polymers such as polymethyl methacrylate, polystyrene and acrylonitrile-styrene copolymers. Examples include styrene-based polymers such as (AS resin), polycarbonate-based polymers, and the like.
- Materials for the transparent protective film include polyethylene, polypropylene, polyolefins having a cyclo- or norbornene structure, polyolefin-based polymers such as ethylene/propylene copolymers, vinyl chloride-based polymers, and amide-based polymers such as nylon and aromatic polyamides.
- imide-based polymer imide-based polymer, sulfone-based polymer, polyethersulfone-based polymer, polyetheretherketone-based polymer, polyphenylene sulfide-based polymer, vinyl alcohol-based polymer, vinylidene chloride-based polymer, vinyl butyral-based polymer, acrylate-based polymer, polyoxymethylene-based polymer
- the thickness of the base material is not particularly limited, and is, for example, about 1 to 500 ⁇ m.
- the base material is preferably subjected to release treatment so that the adhesive layer can be easily peeled off after being attached to the adherend.
- release-treated polyethylene terephthalate (PET) sheet is preferable. used for
- the adhesive layer can be formed by applying the ultraviolet curable composition and then curing the composition by irradiating it with ultraviolet rays. It is preferable that the adhesive layer is partially arranged on the substrate by a method such as printing.
- the thickness of the adhesive layer is preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more. Sufficient adhesion can be obtained by setting the thickness of the adhesive layer to 30 ⁇ m or more.
- the upper limit of the thickness of the adhesive layer is not particularly limited, it is preferably 1000 ⁇ m or less, and more preferably 500 ⁇ m or less, from the viewpoint of responding to thinner electronic devices.
- one surface of the pressure-sensitive adhesive layer (the side not in contact with the base material) is attached to the first adherend, and then the base material is peeled off to expose the other surface of the pressure-sensitive adhesive layer.
- materials for the first adherend and the second adherend include metals such as stainless steel and aluminum, and resins.
- a laminate in which a first adherend and a second adherend are laminated via the adhesive layer contained in the adhesive sheet of the present invention is also one aspect of the present invention.
- the ultraviolet curable composition of the present invention is applied and exposed to form an adhesive layer, and a second adherend is attached on the adhesive layer to form a laminate.
- a method for producing a laminate to be produced is also one aspect of the present invention.
- inkjet printing, screen printing, spray coating, spin coating, gravure offset, or reverse offset printing is preferably used.
- the ultraviolet curable composition is partially applied onto the first adherend.
- an ultraviolet curable composition which is excellent in printability, ultraviolet reactivity in the presence of oxygen, and adhesiveness at room temperature and high temperature.
- Viscoat #150D Tetrahydrofurfuryl alcohol multimeric acrylic acid ester (manufactured by Osaka Organic Chemical Industry Co., Ltd.)
- LA Lauryl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)
- IBOA isobornyl acrylate (manufactured by Nippon Shokubai Co., Ltd.)
- INAA isononyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.) Viscoat #190;
- CBA Ethyl carbitol acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)
- 2-EHA 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.)
- WAKA heptyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)
- IDAA isodecyl acrylate (manufactured
- An acrylic polymer as a thermoplastic resin used in Examples and Comparative Examples was prepared by the following method.
- (Acrylic polymer A) 100 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, 0.1 part by weight of 2-hydroxyethyl acrylate, and 0.1 part by weight of 2-hydroxyethyl acrylate were placed in a 2 L separable flask equipped with a thermometer, a stirrer, a nitrogen inlet tube, and a cooling tube. 300 parts by weight of ethyl acetate were added. Next, after nitrogen gas was blown in for 30 minutes to replace the inside of the reaction vessel with nitrogen, the inside of the reaction vessel was heated to 80° C. while stirring.
- the resulting solution was diluted with a diluting solvent (a mixed solvent of methanol and toluene, the weight ratio of methanol and toluene being 1:2) to obtain a solution with a solid content of 20% by weight.
- a diluting solvent a mixed solvent of methanol and toluene, the weight ratio of methanol and toluene being 1:2
- this solution was applied onto a release-treated PET film so that the thickness after drying was 100 ⁇ m, and dried at 80° C. for 1 hour and at 110° C. for 1 hour to obtain acrylic polymer A. rice field.
- THF and acrylic polymer B are weighed on an aluminum dish so that the content of the acrylic polymer B is 1 part by weight with respect to 100 parts by weight of tetrahydrofuran (THF), and these are dried in an oven at 140 ° C.
- THF tetrahydrofuran
- the resulting solution was diluted with a diluting solvent (a mixed solvent of methanol and toluene, the weight ratio of methanol and toluene being 1:2) to obtain a solution with a solid content of 20% by weight.
- a diluting solvent a mixed solvent of methanol and toluene, the weight ratio of methanol and toluene being 1:2
- this solution was applied onto a release-treated PET film so that the thickness after drying was 100 ⁇ m, and dried at 80° C. for 1 hour and at 110° C. for 1 hour to obtain acrylic polymer C. rice field.
- the said cured material used for evaluation was produced as follows. (Production of cured product)
- the UV-curable composition was applied with an applicator to a thickness of 150 ⁇ m on a PET sheet (manufactured by Nippa Co., Ltd., “1-E”, thickness 50 ⁇ m) that had been subjected to a release treatment on one side. Then, without sealing the upper surface of the coating, in an atmospheric environment, using a batch-type UV LED curing device ("M UVBA" manufactured by ITEC Co., Ltd.), UV illumination with a wavelength of 365 nm and a wavelength of 405 nm at a UV illumination of 30 mW/cm 2 and a wavelength of 405 nm.
- the ultraviolet curable composition was cured by irradiating ultraviolet rays with an irradiation energy of 1350 mJ/cm 2 at a setting of 60 mW/cm 2 to obtain a cured product.
- UVBA batch-type UV LED curing device
- UV illumination intensity at a wavelength of 365 nm was set to 30 mW/cm 2 and the UV illumination intensity at a wavelength of 405 nm was set to 60 mW/cm 2 , and the irradiation energy was 1350 mJ/.
- a homopolymer cured product was obtained by irradiating the photopolymerizable composition layer with ultraviolet rays of cm 2 .
- the viscoelasticity of the obtained cured homopolymer was measured using a viscoelasticity measuring device ("ARES-G2" manufactured by TA Instruments).
- the peak temperature of the loss tangent was defined as the glass transition temperature Tg (°C).
- the gel fraction of the cured homopolymer was also measured in the same manner.
- Tg The tan ⁇ peak temperature of the cured product prepared as described above was measured using a dynamic viscoelasticity measuring device (“DVA-200” manufactured by IT Keisoku Kogyo Co., Ltd.) under the following conditions, and was taken as Tg.
- DVA-200 dynamic viscoelasticity measuring device manufactured by IT Keisoku Kogyo Co., Ltd.
- FIG. 1 explains the sample preparation method and the measurement target
- FIG. It explains the method of calculating the surface reaction rate and the back surface reaction rate.
- a sample of the cured product prepared as described above (cured in an atmospheric environment without sealing the upper surface of the coating; see FIG.
- UV ultraviolet rays
- the obtained absorbance at 810 cm ⁇ 1 is set to 0% (minimum value), and the “absorbance with PET (surface)” is set to 100% (maximum value), and “absorbance without PET (surface)” and “absorbance without PET ( back)” means the size.
- B
- Adhesive strength peel test
- Five pieces were prepared by transferring them to the treated surface and cutting them so as to have a width of 25 mm and a length of 200 mm (attachment surface of 125 mm).
- the PET sheet on the side opposite to the transfer surface was peeled off, attached to a SUS 304-BA substrate of 80 mm ⁇ 125 mm ⁇ 1 mmt, and crimped by reciprocating once with a 2 kg roller.
- the pressure-bonded test piece was subjected to 180° peeling at a speed of 300 mm/min using a universal testing machine ("Tensilon RTI-1310" manufactured by A&D) to determine the adhesive strength (integral average converted load).
- High temperature evaluation at 60° C. and 115° C. was performed in a chamber using a constant temperature bath (manufactured by Mita Sangyo Co., Ltd.).
- the center of the test piece is impacted by free fall from a height of 233 mm with a falling weight of 16 ⁇ at 2 m / s.
- the horizontal axis is time (unit [ms])
- the vertical axis is the impact load (unit [N]). Absorption rate was obtained. It is favorable if a shock absorption rate of 0.2 J or more is obtained.
- the screen printability of the ultraviolet curable composition was evaluated using a screen printer ("SSA-PC560E", manufactured by SERIA).
- the screen printing plate uses a pattern-treated 70-mesh printing plate, pattern-coated on a PET sheet (“1-E” manufactured by Nippa Co., Ltd., thickness 50 ⁇ m), and stringiness and printed matter when separated from the screen plate leveling and defoaming properties were observed. Excellent stringiness, leveling, and antifoaming properties are marked with " ⁇ ”. Those that were not defoamed were evaluated as " ⁇ ”, and those that caused stringing when the plate was separated were evaluated as "x”.
- the thin layer obtained after curing was evaluated according to the following criteria. ⁇ : There was no feeling of liquidity, and the composition was sufficiently cured and had a feeling of tackiness. O: No liquid feeling, but no tackiness. x: There was a feeling of liquid, and the curing was insufficient.
- an ultraviolet curable composition which is excellent in printability, ultraviolet reactivity in the presence of oxygen, and adhesiveness at room temperature and high temperature.
- UV curable adhesive composition 20 PET sheet
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Abstract
Description
本開示2は、更に、前記硬化成分に対する反応性を有さない非反応性成分を含有する本開示1の紫外線硬化性組成物である。
本開示3は、前記硬化成分100重量部に対して前記非反応性成分を0.1~140重量部の比率で含有する本開示2の紫外線硬化性組成物である。
本開示4は、前記非反応性成分が、熱可塑性樹脂及び粘着付与剤の少なくとも一方を含む本開示2又は3の紫外線硬化性組成物である。
本開示5は、前記硬化物における大気側の面及び前記基材側の面の反応率が共に80%以上である本開示1~4のいずれかの紫外線硬化性組成物である。
本開示6は、前記架橋成分が、前記硬化成分に対する反応性を有するもの、又は、前記硬化成分及び前記非反応性成分と反応するものである本開示2~5のいずれかの紫外線硬化性組成物である。
本開示7は、前記架橋成分が、イソシアネート基、エポキシ基、アルデヒド基、水酸基、アミノ基、(メタ)アクリレート基、ビニル基からなる群より選ばれる少なくとも1つの結合性官能基を有する本開示1~6のいずれかの紫外線硬化性組成物である。
本開示8は、前記架橋成分が、ホモポリマーのゲル分率が80%以上となる(メタ)アクリレートモノマーを含む本開示1~7のいずれかの紫外線硬化性組成物である。
本開示9は、前記架橋成分が、25℃での粘度が10000cps以上である(メタ)アクリレートモノマーであり、前記硬化成分100重量%中に0.1~25重量%含まれる本開示1~8のいずれかの紫外線硬化性組成物である。
本開示10は、前記紫外線硬化剤の含有量が、前記硬化成分100重量部に対して0.2~10重量部である本開示1~9のいずれかの紫外線硬化性組成物である。
本開示11は、前記紫外線硬化剤の含有量が、前記硬化成分100重量部に対して0.4~5重量部である本開示10の紫外線硬化性組成物である。
本開示12は、前記硬化成分が、窒素含有モノマーを含む本開示1~11のいずれかの紫外線硬化性組成物である。
本開示13は、前記窒素含有モノマーの含有量が、前記硬化成分100重量%中に5~33重量%である本開示12の紫外線硬化性組成物である。
本開示14は、前記窒素含有モノマーが、ラクタム構造を有するモノマーを含む本開示12又は13の紫外線硬化性組成物である。
本開示15は、前記硬化物のゲル分率が15~67%である本開示1~14のいずれかの紫外線硬化性組成物である。
本開示16は、印刷用紫外線硬化性組成物である本開示1~15のいずれかの紫外線硬化性組成物である。
本開示17は、スクリーン印刷又はインクジェット印刷で用いられる本開示16の紫外線硬化性組成物である。
本開示18は、基材と、前記基材の少なくとも片面に設けられる本開示1~17のいずれかの紫外線硬化性組成物からなる粘着層とを備える粘着シートである。
本開示19は、前記粘着層が前記基材上に部分的に配置されている本開示18の粘着シートである。
本開示20は、本開示18又は19の粘着シートに含まれる前記粘着層を介して第一の被着体と第二の被着体とが貼り合わせられている積層体である。
本開示21は、第一の被着体上に、本開示1~17のいずれかの紫外線硬化性組成物を塗布し、露光することにより粘着層を形成し、前記粘着層上に第二の被着体を貼付することにより積層体を作製する積層体の製造方法である。
本開示22は、前記紫外線硬化性組成物を塗布する方法は、インクジェット印刷、スクリーン印刷、スプレーコート、スピンコート、グラビアオフセット、又は、反転オフセット印刷であり、前記紫外線硬化性組成物が前記第一の被着体上に部分的に塗布される本開示21の積層体の製造方法である。
以下に本発明を詳述する。
なお、本明細書において、上記「(メタ)アクリレート」は、アクリレート又はメタクリレートを意味し、上記「エポキシ(メタ)アクリレート」とは、エポキシ化合物中の全てのエポキシ基を(メタ)アクリル酸と反応させた化合物のことを表す。
(ホモポリマーのガラス転移温度の測定)
(メタ)アクリレートモノマー100重量部と、光重合開始剤0.2重量部とを撹拌混合して光重合性組成物を得る。得られた光重合性組成物を厚み100μmとなるように光重合性組成物層を形成する。波長365nmの照度30mW/cm2、波長405nmの照度60mW/cm2に設定し、照射エネルギー1350mJ/cm2の紫外線を光重合性組成物層に照射することにより、ホモポリマー硬化物を作製する。
得られたホモポリマー硬化物の粘弾性を、せん断モード、3℃/分の昇温速度で-100℃から200℃まで温度を上昇させる条件、並びに周波数1Hz及び歪0.1%の条件で測定する。得られた測定結果において、損失正接のピーク温度をガラス転移温度Tg(℃)とする。
上記紫外線硬化剤としては、光ラジカル重合開始剤が好適に用いられる。紫外線硬化剤及び光ラジカル重合開始剤は単独で用いられてもよく、2種以上を併用してもよい。
上記無溶剤系アクリルポリマーの市販品としては、例えば、東亞合成社製のARUFON-UP1000シリーズ、UH2000シリーズ、UC3000シリーズ、クラレ社製のアクリル系ブロック共重合体 クラリティ LAシリーズ、LKシリーズ等が挙げられる。
上記ロジンジオールは、分子内にロジン骨格と水酸基とを各々2個有するロジン変性ジオールであれば特に限定されない。分子内にロジン成分を有するジオールは、ロジンポリオールと称されるが、これにはロジン成分を除く骨格がポリプロピレングリコール(PPG)のようなポリエーテル型と、縮合系ポリエステルポリオール、ラクトン系ポリエステルポリオール、ポリカーボネートジオールのようなポリエステル型とがある。
上記ロジンジオールとしては、例えば、ロジンと多価アルコールとを反応させて得られるロジンエステル、ロジンとエポキシ化合物とを反応させて得られるエポキシ変性ロジンエステル、ロジン骨格を有するポリエーテル等の水酸基を有する変性ロジン等が挙げられる。これらは従来公知の方法によって製造することができる。
上記ロジン系樹脂の市販品としては、例えば、荒川化学工業社製のパインクリスタルD-6011、KE-615-3、KR-614、KE-100、KE-311、KE-359、KE-604、D-6250等が挙げられる。
上記テルペンフェノール系樹脂とは、松ヤニやオレンジの皮等の天然物から得られる精油成分であるテルペン系樹脂とフェノールとの共重合体であって、当該共重合体の少なくとも一部水素化した部分水添テルペンフェノール系樹脂又は完全に水素化した完全水添テルペンフェノール系樹脂も含まれる。
ここで、完全水添テルペンフェノール系樹脂は、テルペンフェノール系樹脂を、実質的に完全に水添することにより得られるテルペン系樹脂(粘着付与樹脂)であり、部分水添テルペンフェノール系樹脂は、テルペンフェノール系樹脂を部分的に水添することにより得られるテルペン系樹脂(粘着付与樹脂)である。そして、テルペンフェノール系樹脂は、テルペン由来の二重結合とフェノール類由来の芳香族環二重結合とを有している。したがって、完全水添テルペンフェノール系樹脂とは、テルペン部位およびフェノール部位の両方の部位が、完全に、あるいはほとんど水添された粘着付与樹脂を意味し、部分水添テルペンフェノール系樹脂とは、それらの部位の水添程度が完全でなく、部分的であるテルペンフェノール系樹脂を意味する。上記水添する方法や反応形式としては、特に限定されるものではない。
上記テルペンフェノール系樹脂の市販品としては、例えば、ヤスハラケミカル社製のYSポリスターNH(完全水添テルペンフェノール系樹脂)等が挙げられる。
上記一塩基性有機酸エステルは特に限定されない。例えば、酪酸、イソ酪酸、カプロン酸、2-エチル酪酸、ヘプチル酸、n-オクチル酸、2-エチルヘキシル酸、ペラルゴン酸(n-ノニル酸)、デシル酸等の一塩基性有機酸と、トリエチレングリコール、テトラエチレングリコール、トリプロピレングリコール等のグリコールとの反応によって得られたグリコールエステル等が挙げられる。
上記多塩基性有機酸エステルは特に限定されず、例えば、アジピン酸、セバシン酸、アゼライン酸等の多塩基性有機酸と、炭素数4~8の直鎖又は分岐構造を有するアルコールとの反応によって得られたエステル化合物等が挙げられる。
上記有機リン酸エステルまたは有機亜リン酸エステルとしては、例えば、リン酸トリメチル、リン酸トリエチル、リン酸トリプロピル、リン酸トリブチル、リン酸トリ(2-エチルヘキシル)、リン酸トリ(ブトキシエチル)、亜リン酸トリ(2-エチルヘキシル)、イソデシルフェニルホスフェート、トリイソプロピルホスフェート等が挙げられる。
(硬化物の作製)
上記紫外線硬化性組成物を、基材としての片面離型処理されたPETシート上に、厚み150μmとなるようにアプリケーターにて塗布する。その後、塗工上面を封止せずに大気環境下で、紫外線照射装置を用いて、波長365nmのUV照度30mW/cm2、波長405nmのUV照度60mW/cm2となるように設定し、照射エネルギー1350mJ/cm2の紫外線を照射することにより、上記紫外線硬化性組成物を硬化させて硬化物を得る。
図1及び2は、表面反応率及び裏面反応率の算出方法を説明するための図であり、図1は、サンプルの作製方法及び測定対象を説明し、図2は、得られたIRスペクトルから表面反応率及び裏面反応率を算出する方法を説明するものである。上記のとおり作製した硬化物のサンプル(塗工上面を封止せずに大気環境下で硬化したもの。図1(a)参照。)を「硬化物A」とし、紫外線硬化型粘着剤組成物10をPETシート20で挟み込んだこと以外は硬化物Aと同様にして紫外線(UV)を照射して作製したサンプル(図1(b)参照。)を「硬化物B」とする。
まず、硬化物Aを0.3g程度アルミパン上に取り、THF:アセトン:エタノールを8:1:1の重量比で含む混合溶媒を、硬化物のサンプルが飛び散らないように静かに添加し、2時間ほど膨潤させる。その後、110℃で30分間、170℃で1時間、190℃で30分間の乾燥を行う。なお、乾燥後に混合溶媒が完全に蒸発したことを確認する。そして、乾燥後のアルミパンと乾燥させたサンプルの重量を秤量し、以下の式により反応率を算出する。
反応率[%]=100-(乾燥後のアルミパンとサンプルの合計重量-乾燥前のアルミパン重量)/(乾燥前のアルミパンとサンプルの合計重量-乾燥前のアルミパン重量)×100
更に、硬化物Bの硬化時の照射面(表面)について、PETシートを剥離した後、同様にATR法により図2中に示したIRスペクトルを測定し、810cm-1の吸光度の値を得る。得た値を「PET有り吸光度(表面)」とする。
これらの値と上記反応率とから、下記式により、表面反応率、裏面反応率、及び、反応進行率を算出する。
表面反応率[%]=反応率[%]×PET無し吸光度(表面)/PET有り吸光度(表面)
裏面反応率[%]=反応率[%]×PET無し吸光度(裏面)/PET有り吸光度(表面)
反応進行率[%]=PET無し吸光度(表面)/PET無し吸光度(裏面)×100
ここで、「PET無し吸光度(表面)/PET有り吸光度(表面)」及び「PET無し吸光度(裏面)/PET有り吸光度(表面)」は、硬化前の紫外線硬化型粘着剤組成物を測定して得られた810cm-1の吸光度を0%(最小値)とし、「PET有り吸光度」を100%(最大値)としたときの「PET無し吸光度(表面)」及び「PET無し吸光度(裏面)」の大きさを意味し、例えば「PET無し吸光度(表面)/PET有り吸光度(表面)」は、図2中の反応率Xを意味し、下記式で表される。
反応率X=B/A
A=|ABS.M-ABS.0|
B=|ABS.D-ABS.0|
なお、上記粘度は、例えば、E型粘度計としてVISCOMETER TV-22(東機産業社製)を用い、CP1のコーンプレートにて、各粘度領域における最適なトルク数から適宜1~100rpmの回転数を選択することにより測定することができる。
表1及び2に記載された配合比に従い、各材料を遊星式撹拌機(シンキー社製「あわとり練太郎」)にて混合して実施例及び比較例の紫外線硬化性組成物を得た。
表中に略号で記載した材料の詳細は、以下の通りである。
ビスコート#150D:テトラヒドロフルフリルアルコール アクリル酸多量体エステル(大阪有機化学工業株式会社製)
LA:ラウリルアクリレート(大阪有機化学工業社製)
IBOA:アクリル酸イソボルニル(日本触媒社製)
INAA:イソノニルアクリレート(大阪有機化学工業社製)
ビスコート#190;CBA:エチルカルビトールアクリレート(大阪有機化学工業社製)
2-EHA:アクリル酸-2-エチルヘキシル(日本触媒社製)
WAKA:アクリル酸ヘプチル(大阪有機化学工業社製)
IDAA:イソデシルアクリレート(大阪有機化学工業社製)
マクロモノマー AB-6(東亞合成社製)
CN9004:ウレタン(2官能、サートマー・ジャパン社製、「CN9004」)
200PA:ポリエステル系ウレタンアクリレート(新中村化学社製、「U-200PA」)
DMAA:ジメチルアクリルアミド(KJケミカル社製)
アクリエステルHH:ヘキサヒドロフタル酸2-メタクリロイルオキシエチル(三菱ケミカル社製)
4HBA:4-ヒドロキシブチルアクリレート(三菱ケミカル社製)
ミリオネートMR:ポリメリックMDI(東ソー社製)
NVC:N-ビニル-ε-カプロラクタム(東京化成工業社製)
NVA:N-ビニルアセトアミド(昭和電工社製)
PVB:BM-2(積水化学工業社製)
TO125:テルペンレジン(ヤスハラ化学社製)
KS-66:シリコーンオイルに微粉末シリカを配合したオイルコンパウンド型消泡剤(信越シリコーン社製、「KS-66」)
Omnirad 819:Omnirad 819(IGM Resins B.V社製)
Omnirad 184 :Omnirad 184(IGM Resins B.V社製)
Omnirad TPO H:Omnirad TPO H(IGM Resins B.V社製)
(アクリルポリマーA)
温度計、攪拌機、窒素導入管、冷却管を備えた2Lセパラブルフラスコにアクリル酸2-エチルヘキシル100重量部、アクリル酸3重量部、アクリル酸-2-ヒドロキシエチル0.1重量部、重合溶媒として酢酸エチル300重量部とを加えた。次に、窒素ガスを30分間吹き込んで反応容器内を窒素置換した後、反応容器内を撹拌しながら80℃に加熱した。30分後、0.5重量部の重合開始剤としてのt-ブチルパーオキシ-2-エチルヘキサノエート(1時間半減期温度:92.1℃、10時間半減期温度:72.1℃)を5重量部の酢酸エチルで希釈し、得られた重合開始剤溶液を反応容器内に6時間かけて滴下添加した。その後、更に80℃にて6時間反応させた後、反応液を冷却することによりアクリルポリマー溶液を得た。
得られた溶液を希釈溶剤(メタノールとトルエンとの混合溶剤、メタノールとトルエンとの重量比率は1:2)により希釈し、固形分20重量%の溶液とした。次に、本溶液をコーターを用いて乾燥後の厚みが100μmとなるように離型処理したPETフィルム上に塗布し、80℃で1時間、110℃で1時間乾燥させ、アクリルポリマーAを得た。
2Lセパラブルフラスコに、4-HBAを120g入れ、ラウリルメルカプタン(富士フイルム和光純薬社製)を1g添加した。2Lセパラブルフラスコに、熱重合開始剤として、2,2’-アゾビス(2-メチルブチロニトリル)(富士フイルム和光純薬社製、「V-59」)を0.6ppm添加した。次いで、セパラブルフラスコ内を0.5L/minの流量で30分間の窒素バブリングを行い、フラスコ内窒素フローを行った。30分後、窒素フローの流量を0.2L/minに低下させ、溶液をウォーターバスにて60℃に加熱した。重合反応が開始し、粘度が20cpsとなったところで、セパラブルフラスコをウォーターバスから出し、低温化することで、重合反応を途中で停止させた。このようにして、(メタ)アクリレートモノマーと(メタ)アクリル重合体とを含む組成物を得た。(メタ)アクリレートモノマーと(メタ)アクリル重合体とを含む組成物に4-HBAをさらに添加し、粘度を5.5cpsとすることで、アクリルポリマーBを得た。上記アクリルポリマーBを、テトラヒドロフラン(THF)100重量部に対して、含有量が1重量部となるように、THFとアクリルポリマーBをアルミ皿上に計量し、これらを140℃のオーブンで乾燥することで、組成物中の(メタ)アクリル重合体の重量固形分濃度を測定したところ、60重量%であった。
温度計、攪拌機、窒素導入管、冷却管を備えた2Lセパラブルフラスコに、アクリル酸イソオクチル(Sigma-Aldrich Japan社製)100重量部、アクリル酸イソボルニル50重量部、アクリル酸ベンジル(大阪有機株式会社製)10重量部、重合溶媒としての酢酸エチル300重量部、ラウリルメルカプタン0.1重量部を加えた。次に、窒素ガスを30分間吹き込んで反応容器内を窒素置換した後、反応容器内を撹拌しながら80℃に加熱した。30分後、0.5重量部の重合開始剤としてのt-ブチルパーオキシ-2-エチルヘキサノエート(1時間半減期温度:92.1℃、10時間半減期温度:72.1℃)を5重量部の酢酸エチルで希釈し、得られた重合開始剤溶液を反応容器内に6時間かけて滴下添加した。その後、更に80℃にて6時間反応させた後、反応液を冷却することによりアクリルポリマー溶液を得た。
得られた溶液を希釈溶剤(メタノールとトルエンとの混合溶剤、メタノールとトルエンとの重量比率は1:2)により希釈し、固形分20重量%の溶液とした。次に、本溶液をコーターを用いて乾燥後の厚みが100μmとなるように離型処理したPETフィルム上に塗布し、80℃で1時間、110℃で1時間乾燥させ、アクリルポリマーCを得た。
実施例1~17、比較例1~7の紫外線硬化性組成物、及び、該組成物の硬化物について、以下の評価を行った。結果を表1~3に示した。
(硬化物の作製)
紫外線硬化性組成物を、片面離型処理されたPETシート(ニッパ社製「1-E」、厚さ50μm)上に、厚み150μmとなるようにアプリケーターにて塗布した。その後、塗工上面を封止せずに大気環境下で、バッチ式UV LED硬化装置(アイテック株式会社製「M UVBA」)を用いて、波長365nmのUV照度30mW/cm2、波長405nmのUV照度60mW/cm2、となるように設定し、照射エネルギー1350mJ/cm2の紫外線を照射することにより、紫外線硬化性組成物を硬化させて硬化物を得た。
(メタ)アクリレートモノマー100重量部と、光重合開始剤0.2重量部とを、遊星式撹拌機(シンキー社製「あわとり練太郎」)を用いて撹拌して、光重合性組成物を得た。得られた光重合性組成物を、片面離型処理された2枚のPETシート(ニッパ社製「1-E」、厚さ50μm)に挟み込むようにして、厚み100μmとなるように光重合性組成物層を形成した。なお、2枚のPETシートの周囲に厚み100μmのスペーサーを配置した。バッチ式UV LED硬化装置(アイテック株式会社製「M UVBA」)を用いて、波長365nmのUV照度30mW/cm2、波長405nmのUV照度60mW/cm2となるように設定し、照射エネルギー1350mJ/cm2の紫外線を光重合性組成物層に照射することにより、ホモポリマー硬化物を得た。
粘弾性測定装置(TAインスツルメント社製「ARES-G2」)を用いて、得られたホモポリマー硬化物の粘弾性を測定した。治具として直径8mmのパラレルプレートを用い、せん断モード、3℃/分の昇温速度で-100℃から200℃まで温度を上昇させる条件、並びに周波数1Hz及び歪0.1%の条件で測定した。得られた測定結果において、損失正接のピーク温度をガラス転移温度Tg(℃)とした。
上記のとおり作製した硬化物0.15gをテトラヒドロフラン30gに浸漬し、23℃で36時間振蘯浸漬した。その後、200メッシュのフィルターを介して硬化物を取り出した後、110℃で1時間加熱し乾燥した。その後、硬化物の重量を測定した。下記式(X)によりゲル分率を算出した。
W1:硬化物を23℃のテトラヒドロフランに浸漬する前の硬化物の重量
W2:硬化物を23℃のテトラヒドロフランに浸漬した後に取り出し、乾燥した後の硬化物の重量
上記のとおり作製した硬化物を、動的粘弾性測定装置(アイティー計測制御社製「DVA-200」)にて、以下の条件で測定したtanδピーク温度を、Tgとした。
[測定条件]
せん断法
測定温度:-100~200℃
昇温速度:3℃/分
歪み量:0.1%
周波数:1Hz
上記のとおり作製した硬化物を、0.3g程度アルミパン上に取り、THF:アセトン:エタノールを8:1:1の重量比で含む混合溶媒を、硬化物のサンプルが飛び散らないように静かに添加し、2時間ほど膨潤させた。その後、110℃で30分間、170℃で1時間、190℃で30分間の乾燥を行った。なお、乾燥後に混合溶媒が完全に蒸発したことを確認した。そして、乾燥後のアルミパンと乾燥させたサンプルの重量を秤量し、以下の式により反応率を算出した。
反応率[%]=100-(乾燥後のアルミパンとサンプルの合計重量-乾燥前のアルミパン重量)/(乾燥前のアルミパンとサンプルの合計重量-乾燥前のアルミパン重量)×100
図1及び2は、表面反応率及び裏面反応率の算出方法を説明するための図であり、図1は、サンプルの作製方法及び測定対象を説明し、図2は、得られたIRスペクトルから表面反応率及び裏面反応率を算出する方法を説明するものである。上記のとおり作製した硬化物のサンプル(塗工上面を封止せずに大気環境下で硬化したもの。図1(a)参照。)を「硬化物A」とし、紫外線硬化型粘着剤組成物10をPETシート20で挟み込んだこと以外は硬化物Aと同様にして紫外線(UV)を照射して作製したサンプル(図1(b)参照。)を「硬化物B」とした。
まず、硬化物Aの表裏面に対してフーリエ変換赤外分光装置(Nicolet iS5 FT-IR)を用いてATR法により図2中に示したIRスペクトルを測定し、810cm-1の吸光度の値を得た。得た値をそれぞれ「PET無し吸光度(表面)」及び「PET無し吸光度(裏面)」とした。
更に、硬化物Bの硬化時の照射面(表面)について、PETシートを剥離した後、同様にATR法により図2中に示したIRスペクトルを測定し、810cm-1の吸光度の値を得た。得た値を「PET有り吸光度(表面)」とした。
これらの値と上記反応率とから、下記式により、表面反応率、裏面反応率、及び、反応進行率を算出した。
表面反応率[%]=反応率[%]×PET無し吸光度(表面)/PET有り吸光度(表面)
裏面反応率[%]=反応率[%]×PET無し吸光度(裏面)/PET有り吸光度(表面)
反応進行率[%]=表面反応率[%]/裏面反応率[%]×100
ここで、「PET無し吸光度(表面)/PET有り吸光度(表面)」及び「PET無し吸光度(裏面)/PET有り吸光度(表面)」は、硬化前の紫外線硬化型粘着剤組成物を測定して得られた810cm-1の吸光度を0%(最小値)とし、「PET有り吸光度(表面)」を100%(最大値)としたときの「PET無し吸光度(表面)」及び「PET無し吸光度(裏面)」の大きさを意味する。例えば「PET無し吸光度(表面)/PET有り吸光度(表面)」は、図2中の反応率Xを意味し、下記式で表される。
反応率X=B/A
A=|ABS.M-ABS.0|
B=|ABS.D-ABS.0|
上記Tgの評価にて-17℃におけるtanδ値を確認した。
上記のとおり作製した硬化物を幅125mm、長さ125mmとなるように切り出し、封止していない面が接するように、易接着性ポリエステルフィルム(「コスモシャイン A4100」、東洋紡株式会社製)の内側処理面に転写し、幅25mm、長さ200mm(被着面125mm)となるようにカットしたものを5本準備した。次に、転写面とは反対側のPETシートを剥離し、80mm×125mm×1mmtのSUS 304-BA基板に貼合わせ、2kgローラーにて一往復させることで圧着した。圧着した試験片を万能試験機(A AND D社製、「テンシロン RTI-1310」)を用いて300mm/minの速度で180°ピールを行い、粘着力を求めた(積分平均換算荷重)。また、60℃及び115℃での高温評価は、恒温槽(三田産業株式会社製)を用いて、チャンバー内で実施した。
40mm×40mm×3mmtの中央に20mm×20mm×3mmtの穴が開いたSUS基板に、25mm×25mm×3mmtのSUS基板を、25mm×25mm(幅1.5mm)に切り出した硬化物を介して貼合わせ、万能試験機(A AND D社製、「テンシロン RTI-1310」)を用いて62Nにて圧着を行い、試験片を作製した。試験片をIMATEK社製の落錘式衝撃試験機(IM1C-15型)を用いて、16Φの落錘子にて233mmの高さから、2m/sで自然落下により試験片の中央部をインパクトし、横軸が時間(単位[ms])、縦軸が衝撃荷重(単位[N])のスペクトルから、一つ目の山のエネルギー量(面積=衝撃吸収率[J])を算出し、衝撃吸収率を得た。0.2J以上の衝撃吸収率が得られると良好である。
[スクリーン印刷]
紫外線硬化性組成物についてスクリーン印刷機(「SSA-PC560E」、SERIA社製)を用いてスクリーン印刷性を評価した。スクリーン印刷版はパターン処理された70メッシュの印刷版を用い、PETシート(ニッパ社製「1-E」、厚さ50μm)上にパターン塗工し、スクリーン版から離れる際の糸曳き性および印刷物のレベリング、消泡性を観察した。糸曳き・レベリング・消泡性が非常に良好なものは「◎」、糸曳きがなくレベリング・消泡性良好なものは「〇」、糸曳きはないが、やや印刷面が荒れているもしくは消泡されないものを「△」、版離れ時に糸曳きが起こったものは「×」として評価した。
50mm×50mmのアルミ基板上に紫外線硬化性組成物を0.5mL滴下し、スピンコーター(ミカサ社製、「MSB-150」)を用いて回転速度5000rpmにて10s塗布することで、薄層を作製した。得られた薄層に対して、LED UV照射機(Integration Technology社製, Solidcure2)を用いて、波長365nmのUV照度1000mW/cm2となるように設定し、照射エネルギー200mJ/cm2の紫外線を照射して薄層を硬化させた。硬化後に得られた薄層について、下記基準に従って評価した。
◎:液状感がなく、充分に硬化し、タック感があった。
〇:液状感はないが、タック感がなかった。
×:液状感があり、硬化が不充分であった。
20:PETシート
Claims (22)
- (メタ)アクリレートモノマー及び架橋成分を含む硬化成分と、紫外線硬化剤と、を含有する紫外線硬化性組成物であって、
前記(メタ)アクリレートモノマーは、前記硬化成分100重量%中に、ホモポリマーのガラス転移温度が-70℃~-30℃であるモノマーを50~85重量%含み、
前記組成物を150μmの厚みで基材上に塗工して塗工上面を封止せずに、大気環境下で波長315nm~480nmの紫外線を放射照度90mW/cm2、照射量1350mJ/cm2の条件で照射することによって得られる硬化物は、ゲル分率が0.4~78%であり、ガラス転移温度が-35℃~10℃であり、反応率が83%以上であり、かつ、前記基材側の面に対する大気側の面の反応進行率が93%以上である
ことを特徴とする紫外線硬化性組成物。 - 更に、前記硬化成分に対する反応性を有さない非反応性成分を含有する請求項1記載の紫外線硬化性組成物。
- 前記硬化成分100重量部に対して前記非反応性成分を0.1~140重量部の比率で含有する請求項2記載の紫外線硬化性組成物。
- 前記非反応性成分は、熱可塑性樹脂及び粘着付与剤の少なくとも一方を含む請求項2又は3記載の紫外線硬化性組成物。
- 前記硬化物における大気側の面及び前記基材側の面の反応率が共に80%以上である請求項1~4のいずれかに記載の紫外線硬化性組成物。
- 前記架橋成分は、前記硬化成分に対する反応性を有するもの、又は、前記硬化成分及び前記非反応性成分と反応するものである請求項2~5のいずれかに記載の紫外線硬化性組成物。
- 前記架橋成分は、イソシアネート基、エポキシ基、アルデヒド基、水酸基、アミノ基、(メタ)アクリレート基、ビニル基からなる群より選ばれる少なくとも1つの結合性官能基を有する請求項1~6のいずれかに記載の紫外線硬化性組成物。
- 前記架橋成分は、ホモポリマーのゲル分率が80%以上となる(メタ)アクリレートモノマーを含む請求項1~7のいずれかに記載の紫外線硬化性組成物。
- 前記架橋成分は、25℃での粘度が10000cps以上である(メタ)アクリレートモノマーであり、前記硬化成分100重量%中に0.1~25重量%含まれる請求項1~8のいずれかに記載の紫外線硬化性組成物。
- 前記紫外線硬化剤の含有量は、前記硬化成分100重量部に対して0.2~10重量部である請求項1~9のいずれかに記載の紫外線硬化性組成物。
- 前記紫外線硬化剤の含有量は、前記硬化成分100重量部に対して0.4~5重量部である請求項10記載の紫外線硬化性組成物。
- 前記硬化成分は、窒素含有モノマーを含む請求項1~11のいずれかに記載の紫外線硬化性組成物。
- 前記窒素含有モノマーの含有量は、前記硬化成分100重量%中に5~33重量%である請求項12記載の紫外線硬化性組成物。
- 前記窒素含有モノマーは、ラクタム構造を有するモノマーを含む請求項12又は13記載の紫外線硬化性組成物。
- 前記硬化物のゲル分率が15~67%である請求項1~14のいずれかに記載の紫外線硬化性組成物。
- 印刷用紫外線硬化性組成物である請求項1~15のいずれかに記載の紫外線硬化性組成物。
- スクリーン印刷又はインクジェット印刷で用いられる請求項16に記載の紫外線硬化性組成物。
- 基材と、前記基材の少なくとも片面に設けられる請求項1~17のいずれかに記載の紫外線硬化性組成物からなる粘着層とを備えることを特徴とする粘着シート。
- 前記粘着層が前記基材上に部分的に配置されている請求項18記載の粘着シート。
- 請求項18又は19記載の粘着シートに含まれる前記粘着層を介して第一の被着体と第二の被着体とが貼り合わせられていることを特徴とする積層体。
- 第一の被着体上に、請求項1~17のいずれかに記載の紫外線硬化性組成物を塗布し、露光することにより粘着層を形成し、前記粘着層上に第二の被着体を貼付することにより積層体を作製することを特徴とする積層体の製造方法。
- 前記紫外線硬化性組成物を塗布する方法は、インクジェット印刷、スクリーン印刷、スプレーコート、スピンコート、グラビアオフセット、又は、反転オフセット印刷であり、前記紫外線硬化性組成物が前記第一の被着体上に部分的に塗布される請求項21記載の積層体の製造方法。
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