WO2013061830A1 - 熱伝導性感圧接着剤組成物、熱伝導性感圧接着性シート状成形体、これらの製造方法、及び電子部品 - Google Patents
熱伝導性感圧接着剤組成物、熱伝導性感圧接着性シート状成形体、これらの製造方法、及び電子部品 Download PDFInfo
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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
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
- C09J133/12—Homopolymers or copolymers of methyl methacrylate
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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
- 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
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/02—Elements
- C08K3/04—Carbon
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3737—Organic materials with or without a thermoconductive filler
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
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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
- 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
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a heat conductive pressure-sensitive adhesive composition, a heat conductive pressure-sensitive adhesive sheet-like molded article, a production method thereof, and the heat conductive pressure-sensitive adhesive composition or the heat conductive pressure-sensitive adhesive sheet-like molding.
- the present invention relates to an electronic component having a body.
- thermo conductive pressure-sensitive adhesive composition a composition having a pressure-sensitive adhesive property in addition to thermal conductivity
- sheet a composition having a pressure-sensitive adhesive property in addition to thermal conductivity
- thermo conductive pressure-sensitive adhesive sheet a composition having a pressure-sensitive adhesive property in addition to thermal conductivity
- thermoally conductive pressure-sensitive adhesive sheet-like molded product a composition having a pressure-sensitive adhesive property in addition to thermal conductivity
- the heat conductive pressure-sensitive adhesive composition and the heat conductive pressure-sensitive adhesive sheet-like molded body are used as one of the purposes for transferring heat from the heat generating element to the heat radiating element. Flexibility that can be done is required.
- the heat conductive pressure-sensitive-adhesive sheet-like molded body having excellent flexibility for example, there are a flame-retardant heat dissipation sheet disclosed in Patent Document 1 and a heat conductive sheet disclosed in Patent Document 2.
- heat is generated by improving flexibility. It is conceivable to improve the adhesion between the body and the radiator. Further, in order to efficiently transfer heat from the heating element to the heat radiating body using the heat conductive pressure-sensitive adhesive composition or the heat conductive pressure-sensitive adhesive sheet-like molded body, for example, these are formed into thin thicknesses. It is conceivable to reduce the thermal resistance in the direction.
- the conventional heat-conductive pressure-sensitive adhesive composition or heat-conductive pressure-sensitive adhesive sheet-like molded article has a problem that it is difficult to obtain the tensile strength required as a product when it is thinly formed. Moreover, when the composition was adjusted to give a tensile strength, the hardness increased and the flexibility was impaired. If it becomes hard, the heat transfer efficiency from the heat generating element to the heat radiating member may be deteriorated by biting air between the adherend and the like. As described above, in the conventional technique, when the heat conductive pressure-sensitive adhesive composition or the heat conductive pressure-sensitive adhesive sheet-like molded body is thinly formed, it is difficult to achieve both flexibility and tensile strength.
- the present invention provides a thermally conductive pressure-sensitive adhesive composition and a thermally conductive pressure-sensitive adhesive sheet-like molded product that can be provided with flexibility and tensile strength even when molded thinly, and a method for producing these, It is an object of the present invention to provide a heat conductive pressure-sensitive adhesive composition or an electronic component including the heat conductive pressure-sensitive adhesive sheet-like molded body.
- (meth) acryl means “acryl and / or methacryl”.
- Thermal conductive filler (B) is added to improve the thermal conductivity of the thermally conductive pressure-sensitive adhesive composition (F) or the thermally conductive pressure-sensitive adhesive sheet-like molded body (G) described later. Means a filler having a thermal conductivity of 1 W / m ⁇ K or more.
- Polymerization reaction of (meth) acrylic acid ester monomer ( ⁇ 1) and polyfunctional monomer (D) refers to (meth) acrylic acid ester monomer ( ⁇ 1) and polyfunctional monomer ( It means one or a plurality of polymerization reactions among a copolymerization reaction with D), a polymerization reaction of (meth) acrylate monomer ( ⁇ 1), and a polymerization reaction of polyfunctional monomer (D). .
- (Meth) acrylic acid ester polymer (A1) and / or (meth) acrylic acid ester monomer ( ⁇ 1) -derived polymer cross-linking reaction means (meth) acrylic acid ester polymer Cross-linking reaction between (A1), cross-linking reaction between polymers containing structural units derived from (meth) acrylic acid ester monomer ( ⁇ 1), and (meth) acrylic acid ester polymers (A1) and (meth) Among crosslinking reactions with a polymer containing a structural unit derived from an acrylate monomer ( ⁇ 1), it means one or more crosslinking reactions.
- the 4th aspect of this invention is 100 masses of (meth) acrylic-ester resin compositions (A) containing the (meth) acrylic-ester polymer (A1) and the (meth) acrylic-ester monomer ((alpha) 1). 90 parts by mass or more and 1200 parts by mass or less of the thermally conductive filler (B), and 0.2 to 8 parts by mass of the polyfunctional monomer (D) having a plurality of polymerizable unsaturated bonds.
- a heat radiator and the heat conductive pressure-sensitive adhesive composition (F) of the first aspect of the present invention bonded to the heat radiator, or the heat radiator and the heat radiator.
- An electronic component comprising the thermally conductive pressure-sensitive adhesive sheet-like molded body (G) according to the second aspect of the present invention.
- thermoly conductive pressure-sensitive adhesive composition and a thermally conductive pressure-sensitive adhesive sheet-like molded product that can be provided with flexibility and tensile strength even when molded thinly, their production methods,
- a heat conductive pressure-sensitive adhesive composition or an electronic component provided with the heat conductive pressure-sensitive adhesive sheet-like molded body can be provided.
- the thermally conductive pressure-sensitive adhesive composition (F) of the present invention comprises a (meth) acrylic resin composition containing a (meth) acrylic acid ester polymer (A1) and a (meth) acrylic acid ester monomer ( ⁇ 1).
- the product (A), the thermally conductive filler (B), and the polyfunctional monomer (D) having a plurality of polymerizable unsaturated bonds (simply referred to as “polyfunctional monomer (D)”).
- a multifunctional epoxy compound (E) having a functional group of 2 or more and 10,000 or less and a viscosity at 25 ° C.
- Polymerization reaction and polyfunctional monomer (D) polymerization reaction Among them, at least one polymerization reaction, and a crosslinking reaction between (meth) acrylic acid ester polymers (A1), and a crosslinking reaction between polymers containing a structural unit derived from a (meth) acrylic acid ester monomer ( ⁇ 1) And at least one of the crosslinking reactions of the (meth) acrylic acid ester polymer (A1) and the polymer containing a structural unit derived from the (meth) acrylic acid ester monomer ( ⁇ 1) is at least It is done.
- the heat conductive pressure-sensitive-adhesive sheet-like molded object (G) of this invention is (meth) acrylic acid after shape
- Copolymerization reaction of ester monomer ( ⁇ 1) and polyfunctional monomer (D) polymerization reaction of (meth) acrylic acid ester monomer ( ⁇ 1), and polyfunctional monomer (D)
- the reaction is performed at least It become one.
- the materials constituting the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) will be described below.
- the (meth) acrylic resin composition (A) used in the present invention contains a (meth) acrylic acid ester polymer (A1) and a (meth) acrylic acid ester monomer ( ⁇ 1).
- (meth) acrylic acid ester monomer ((alpha) 1) origin Polymerization reaction to obtain a polymer that yields a structural unit of the above, and a crosslinking reaction of a polymer containing a structural unit derived from the (meth) acrylic acid ester polymer (A1) and / or the (meth) acrylic acid ester monomer ( ⁇ 1) And done.
- the polymer containing the structural unit derived from the (meth) acrylic acid ester monomer ( ⁇ 1) is mixed with the component of the (meth) acrylic acid ester polymer (A1) and / or. Partially join.
- the usage-amount of an acrylic ester polymer (A1) and the (meth) acrylic ester monomer ((alpha) 1) is (meth) with respect to 100 mass% of (meth) acrylic resin compositions (A).
- the acrylic acid ester polymer (A1) is preferably 5% by mass or more and 50% by mass or less
- the (meth) acrylic acid ester monomer ( ⁇ 1) is preferably 50% by mass or more and 95% by mass or less.
- the (meth) acrylic acid ester polymer (A1) that can be used in the present invention is not particularly limited, but the (meth) acrylic acid ester monomer that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower. It is preferable to contain the unit (a1) and the monomer unit (a2) having an organic acid group.
- the (meth) acrylate monomer (a1m) that gives the unit (a1) of the (meth) acrylate monomer is not particularly limited.
- ethyl acrylate the glass transition temperature of the homopolymer is -24 ° C
- n-propyl acrylate (-37 ° C)
- n-butyl acrylate (-54 ° C)
- sec-butyl acrylate (-22 ° C)
- n-octyl acrylate (-65 ° C), 2-ethylhexyl acrylate (-50 ° C), 2-methoxyethyl acrylate (-50 ° C) ), 3-methoxypropyl acrylate (-75 ° C), 3-methoxybutyl acrylate (-56 ° C), ethoxymethyl acrylate (-50
- n-butyl acrylate, 2-ethylhexyl acrylate, and 2-methoxyethyl acrylate are preferable, n-butyl acrylate and 2-ethylhexyl acrylate are more preferable, and 2-ethylhexyl acrylate is more preferable.
- acrylic acid ester monomers (a1m) may be used alone or in combination of two or more.
- the monomer unit (a1) derived therefrom is preferably 80% by mass or more and 99.9% by mass in the (meth) acrylic acid ester polymer (A1).
- it is used for polymerization in such an amount that it is more preferably 85% by mass or more and 99.5% by mass or less.
- the amount of the (meth) acrylic acid ester monomer (a1m) is within the above range, the viscosity of the polymerization system at the time of polymerization can be easily maintained within an appropriate range.
- the monomer (a2m) that gives the monomer unit (a2) having an organic acid group is not particularly limited, but representative examples thereof include organic acid groups such as a carboxyl group, an acid anhydride group, and a sulfonic acid group.
- monomers containing sulfenic acid groups, sulfinic groups, phosphoric acid groups, and the like can also be used.
- the monomer having a carboxyl group include, for example, ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, and ⁇ , ⁇ such as itaconic acid, maleic acid, and fumaric acid.
- ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid partial esters such as monomethyl itaconate, monobutyl maleate and monopropyl fumarate can be exemplified.
- the monomer having a sulfonic acid group examples include allyl sulfonic acid, methallyl sulfonic acid, vinyl sulfonic acid, styrene sulfonic acid, ⁇ , ⁇ -unsaturated sulfonic acid such as acrylamide-2-methylpropane sulfonic acid, And salts thereof.
- the monomer (a2m) among the monomers having an organic acid group exemplified above, a monomer having a carboxyl group is more preferable, and a monomer having acrylic acid or methacrylic acid is particularly preferable. . These monomers are industrially inexpensive and can be easily obtained, have good copolymerizability with other monomer components, and are preferable in terms of productivity. In addition, a monomer (a2m) may be used individually by 1 type, and may use 2 or more types together.
- the monomer unit (a2) derived from the monomer unit (a2) is preferably 0.1% by mass or more and 20% by mass or less in the (meth) acrylic acid ester polymer (A1). More preferably, it is used for the polymerization in such an amount that it is 0.5 to 15% by mass.
- the usage-amount of the monomer (a2m) which has an organic acid group exists in the said range, it will become easy to maintain the viscosity of the polymerization system at the time of superposition
- the monomer unit (a2) having an organic acid group is introduced into the (meth) acrylic acid ester polymer (A1) by polymerization of the monomer (a2m) having an organic acid group as described above.
- an organic acid group may be introduced by a known polymer reaction after the (meth) acrylic acid ester polymer (A1) is formed.
- the (meth) acrylic acid ester polymer (A1) may contain a monomer unit (a3) derived from a monomer (a3m) having a functional group other than an organic acid group.
- the functional group other than the organic acid group include a hydroxyl group, an amino group, an amide group, an epoxy group, and a mercapto group.
- Examples of the monomer having a hydroxyl group include (meth) acrylic acid hydroxyalkyl esters such as (meth) acrylic acid 2-hydroxyethyl and (meth) acrylic acid 3-hydroxypropyl.
- Examples of the monomer having an amino group include N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and aminostyrene.
- Examples of monomers having an amide group include ⁇ , ⁇ -ethylenically unsaturated carboxylic acid amide monomers such as acrylamide, methacrylamide, N-methylol acrylamide, N-methylol methacrylamide, and N, N-dimethylacrylamide. Can be mentioned.
- Examples of the monomer having an epoxy group include glycidyl (meth) acrylate and allyl glycidyl ether.
- the monomer (a3m) having a functional group other than the organic acid group one type may be used alone, or two or more types may be used in combination.
- the monomer unit (a3) derived therefrom is 10% by mass or less in the (meth) acrylate polymer (A1). It is preferable to use it for polymerization in such an amount.
- the monomer (a3m) of 10% by mass or less it becomes easy to keep the viscosity of the polymerization system during polymerization in an appropriate range.
- the (meth) acrylic acid ester polymer (A1) has a (meth) acrylic acid ester monomer unit (a1) that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower, and an organic acid group.
- a monomer derived from the monomer (a4m) copolymerizable with the above-described monomer may be contained.
- the monomer (a4m) is not particularly limited, and specific examples thereof include (meth) acrylate monomers other than the (meth) acrylate monomer (a1m), ⁇ , ⁇ -ethylenic monomers. Saturated polycarboxylic acid complete ester, alkenyl aromatic monomer, conjugated diene monomer, non-conjugated diene monomer, vinyl cyanide monomer, carboxylic acid unsaturated alcohol ester, olefin monomer, etc. Can be mentioned.
- the (meth) acrylate monomer other than the (meth) acrylate monomer (a1m) include methyl acrylate (homopolymer having a glass transition temperature of 10 ° C.), methyl methacrylate. (105 ° C.), ethyl methacrylate (63 ° C.), n-propyl methacrylate (25 ° C.), n-butyl methacrylate (20 ° C.), and the like.
- ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid complete ester examples include dimethyl fumarate, diethyl fumarate, dimethyl maleate, diethyl maleate, dimethyl itaconate and the like.
- alkenyl aromatic monomer examples include styrene, ⁇ -methylstyrene, methyl ⁇ -methylstyrene, vinyl toluene, and divinylbenzene.
- conjugated diene monomer examples include 1,3-butadiene, 2-methyl-1,3-butadiene (synonymous with isoprene), 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene. 2-chloro-1,3-butadiene, cyclopentadiene and the like.
- non-conjugated diene monomer examples include 1,4-hexadiene, dicyclopentadiene, ethylidene norbornene and the like.
- vinyl cyanide monomer examples include acrylonitrile, methacrylonitrile, ⁇ -chloroacrylonitrile, ⁇ -ethylacrylonitrile and the like.
- carboxylic acid unsaturated alcohol ester monomer examples include vinyl acetate.
- olefin monomer examples include ethylene, propylene, butene, pentene and the like.
- the monomer (a4m) one type may be used alone, or two or more types may be used in combination.
- the amount of the monomer unit (a4) derived therefrom is preferably 10% by mass or less, more preferably 5% by mass or less in the (meth) acrylate polymer (A1). It is subjected to polymerization in such an amount.
- the (meth) acrylic acid ester polymer (A1) has the above-mentioned (meth) acrylic acid ester monomer (a1m) that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower, and an organic acid group.
- Monomer (a2m) a monomer containing a functional group other than an organic acid group (a3m) used as necessary, and a monomer copolymerizable with these monomers used as needed It can be particularly suitably obtained by copolymerizing the monomer (a4m).
- the polymerization method for obtaining the (meth) acrylic acid ester polymer (A1) is not particularly limited, and may be any of solution polymerization, emulsion polymerization, suspension polymerization, bulk polymerization, and the like, or any other method. .
- solution polymerization is preferable, and among them, solution polymerization using a carboxylic acid ester such as ethyl acetate or ethyl lactate or an aromatic solvent such as benzene, toluene or xylene is more preferable.
- the monomer may be added in portions to the polymerization reaction vessel, but it is preferable to add the whole amount at once.
- the method for initiating the polymerization is not particularly limited, but it is preferable to use a thermal polymerization initiator as the polymerization initiator.
- the thermal polymerization initiator is not particularly limited, and for example, a peroxide polymerization initiator or an azo compound polymerization initiator can be used.
- Peroxide polymerization initiators include hydroperoxides such as t-butyl hydroperoxide, peroxides such as benzoyl peroxide and cyclohexanone peroxide, and persulfates such as potassium persulfate, sodium persulfate and ammonium persulfate. Can be mentioned. These peroxides can also be used as a redox catalyst in appropriate combination with a reducing agent.
- the usage-amount of a polymerization initiator is not specifically limited, It is preferable that it is the range of 0.01 to 50 mass parts with respect to 100 mass parts of monomers.
- polymerization conditions (polymerization temperature, pressure, stirring conditions, etc.) of these monomers are not particularly limited.
- the obtained polymer is separated from the polymerization medium if necessary.
- the separation method is not particularly limited.
- the (meth) acrylic acid ester polymer (A1) can be obtained by placing the polymerization solution under reduced pressure and distilling off the polymerization solvent.
- the weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A1) is measured by gel permeation chromatography (GPC method) and is in the range of 100,000 to 1,000,000 in terms of standard polystyrene. It is more preferable that it is in the range of 200,000 or more and 500,000 or less.
- the weight average molecular weight of the (meth) acrylic acid ester polymer (A1) can be controlled by appropriately adjusting the amount of the polymerization initiator used in the polymerization and the amount of the chain transfer agent.
- the (meth) acrylate monomer ( ⁇ 1) is not particularly limited as long as it contains the (meth) acrylate monomer, but forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower. It is preferable to contain the (meth) acrylic acid ester monomer (a5m).
- a (meth) acrylate monomer (a5m) that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower, it is used for the synthesis of a (meth) acrylate polymer (A1) (meth) )
- a (meth) acrylic acid ester monomer (a5m) may be used individually by 1 type, and may use 2 or more types together.
- the ratio of the (meth) acrylate monomer (a5m) in the (meth) acrylate monomer ( ⁇ 1) is preferably 50% by mass to 100% by mass, more preferably 75% by mass to 100% by mass. It is as follows. By making the ratio of the (meth) acrylic acid ester monomer (a5m) in the (meth) acrylic acid ester monomer ( ⁇ 1) in the above range, the heat conductive pressure-sensitive adhesive having excellent pressure-sensitive adhesiveness and flexibility. It becomes easy to obtain the agent composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G).
- the (meth) acrylic acid ester monomer ( ⁇ 1) may be a mixture of a (meth) acrylic acid ester monomer (a5m) and a monomer copolymerizable therewith.
- the (meth) acrylate monomer ( ⁇ 1) is a (meth) acrylate monomer (a5m) that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or less, and can be copolymerized therewith. It is good also as a mixture of the monomer (a6m) which has an organic acid group.
- Examples of the monomer (a6m) include monomers having an organic acid group similar to those exemplified as the monomer (a2m) used for the synthesis of the (meth) acrylic acid ester polymer (A1). be able to.
- a monomer (a6m) may be used individually by 1 type, and may use 2 or more types together.
- the ratio of the monomer (a6m) in the (meth) acrylic acid ester monomer ( ⁇ 1) is preferably 30% by mass or less, and more preferably 10% by mass or less.
- the (meth) acrylic acid ester monomer ( ⁇ 1) in addition to the (meth) acrylic acid ester monomer (a5m) and the monomer (a6m) having an organic acid group that can be optionally copolymerized, It is good also as a mixture with the monomer (a7m) which can be copolymerized with these.
- Examples of the monomer (a7m) include the monomer (a3m) used for the synthesis of the (meth) acrylic acid ester polymer (A1) and the same amount as those exemplified as the monomer (a4m).
- the body can be mentioned.
- a monomer (a7m) may be used individually by 1 type, and may use 2 or more types together.
- the ratio of the monomer (a7m) in the (meth) acrylic acid ester monomer ( ⁇ 1) is preferably 20% by mass or less, and more preferably 15% by mass or less.
- ⁇ Polymerization initiator> When obtaining the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded product (G), the (meth) acrylic acid ester monomer ( ⁇ 1) and a polyfunctional monomer described below are used. Body (D) polymerizes. In order to accelerate the polymerization, it is preferable to use a polymerization initiator.
- the polymerization initiator include a photopolymerization initiator, an azo thermal polymerization initiator, and an organic peroxide thermal polymerization initiator. From the viewpoint of imparting excellent adhesiveness to the obtained heat conductive pressure-sensitive adhesive composition (F) and heat conductive pressure-sensitive adhesive sheet-like molded body (G), an organic peroxide thermal polymerization initiator is used. It is preferable to use it.
- acylphosphine oxide compounds are preferred.
- Preferred examples of the acylphosphine oxide compound that is a photopolymerization initiator include bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide and 2,4,6-trimethylbenzoyldiphenylphosphine oxide.
- azo-based thermal polymerization initiator 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2-methylbutyronitrile) ) And the like.
- organic peroxide thermal polymerization initiator examples include hydroperoxides such as t-butyl hydroperoxide, benzoyl peroxide, cyclohexanone peroxide, 1,6-bis (t-butylperoxycarbonyloxy) hexane, 1,1-bis ( and a peroxide such as t-butylperoxy) -3,3,5-trimethylcyclohexanone.
- hydroperoxides such as t-butyl hydroperoxide, benzoyl peroxide, cyclohexanone peroxide, 1,6-bis (t-butylperoxycarbonyloxy) hexane, 1,1-bis ( and a peroxide such as t-butylperoxy) -3,3,5-trimethylcyclohexanone.
- organic peroxide thermal polymerization initiators those having a 1-minute half-life temperature of 100 ° C. or more and 170 ° C. or less are preferable.
- the amount of the polymerization initiator used is preferably 0.01 parts by mass or more and 10 parts by mass or less, and 0.1 parts by mass or more and 5 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin composition (A). More preferably, it is 0.3 to 2 parts by mass.
- the polymerization conversion rate of the (meth) acrylic acid ester monomer ( ⁇ 1) is preferably 95% by mass or more. If the polymerization conversion rate of the (meth) acrylic acid ester monomer ( ⁇ 1) is 95% by mass or more, the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded product (G). It is easy to prevent the monomer odor from remaining on the surface.
- a polyfunctional monomer (D) is used for the heat conductive pressure-sensitive-adhesive composition (F) and heat conductive pressure-sensitive-adhesive sheet-like molded object (G) of this invention.
- the polyfunctional monomer (D) one that can be copolymerized with the monomer contained in the (meth) acrylic acid ester monomer ( ⁇ 1) is used.
- the polyfunctional monomer (D) preferably has a plurality of polymerizable unsaturated bonds, and preferably has the unsaturated bond at the terminal.
- the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive feeling can be obtained by using the polyfunctional monomer (D) and the polyfunctional epoxy compound (E) described in detail later. It is considered that the cross-linked structure is uniformly formed in the pressure-adhesive sheet-like molded body (G), and the tensile strength can be improved while maintaining flexibility.
- polyfunctional monomer (D) examples include 1,6-hexanediol di (meth) acrylate, 1,2-ethylene glycol di (meth) acrylate, 1,12-dodecanediol di (meth) acrylate, polyethylene Glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ditri Multifunctional (meth) acrylates such as methylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and 2,4-bis (tri Other substituted triazines, such as Rorome
- a polyfunctional monomer (D) may be used individually by 1 type, and may use 2 or more types together.
- the amount of the polyfunctional monomer (D) used in the heat conductive pressure-sensitive adhesive composition (F) or the heat conductive pressure-sensitive adhesive sheet-like molded product (G) of the present invention is the (meth) acrylic resin composition.
- 100 parts by mass of (A) is 0.2 parts by mass or more and 8 parts by mass or less, and preferably 0.5 parts by mass or more and 2 parts by mass or less.
- a heat conductive filler (B) is used for the heat conductive pressure sensitive adhesive composition (F) and the heat conductive pressure sensitive adhesive sheet-like molded body (G) of the present invention.
- the heat conductivity of the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) can be improved.
- a known heat conductive filler can be used as the heat conductive filler (B).
- Specific examples of the thermally conductive filler (B) include aluminum hydroxide, gallium hydroxide, indium hydroxide, magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, zinc borate hydrate, kaolin clay. , Calcium aluminate hydrate, calcium carbonate, aluminum carbonate, dawsonite, aluminum oxide (alumina), magnesium oxide, zinc oxide, boron nitride, aluminum nitride, silica and the like.
- calcium carbonate, aluminum hydroxide, and aluminum oxide are preferable because they are easily available, chemically stable, and can be added in a large amount, and aluminum hydroxide and aluminum oxide are more preferable.
- One kind of the heat conductive filler (B) may be used alone, or two or more kinds may be used in combination.
- the amount of the heat conductive filler (B) used in the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) is (meth) acrylic resin composition (A) 100. It is 90 to 1200 parts by mass, preferably 100 to 1000 parts by mass, and more preferably 200 to 900 parts by mass with respect to parts by mass.
- the heat conductive pressure sensitive adhesive composition (F) and the mixed composition serving as a base of the heat conductive pressure sensitive adhesive sheet-like molded body (G) Even if the viscosity increases excessively, it becomes difficult to mold the heat conductive pressure-sensitive adhesive composition (E) and the heat conductive pressure-sensitive adhesive sheet-like molded body (F), or even if it can be molded, the heat conductive pressure-sensitive adhesive There is a possibility that the hardness of the composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) increases, and the shape followability (adhesion to the adherend) decreases.
- the heat conductive pressure sensitive adhesive composition (F) and the heat conductive pressure sensitive adhesive sheet are used by using the heat conductive filler (B).
- the effect of improving the thermal conductivity of the shaped molded body (G) is insufficient.
- BET specific surface area of the thermally conductive filler (B) is preferably, 1.0 m 2 / g or more 5.0 m 2 / g or less or less 1.0 m 2 / g or more 10 m 2 / g Is more preferably 1.0 m 2 / g or more and 3.0 m 2 / g or less.
- heat conductive filler (B) While suppressing the viscosity of the product from excessively increasing, it becomes easy to achieve both tensile strength and flexibility in the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G). .
- a heat conductive filler (B1) having a BET specific surface area in the above range a heat conductive filler (B2) having a BET specific surface area of less than 1.0 m 2 / g, and May be used in combination.
- the quantity ratio of the heat conductive filler (B1) having a BET specific surface area in the above range and the heat conductive filler (B2) having a BET specific surface area of less than 1.0 m 2 / g used as required is as follows: Mass ratio (thermally conductive filler (B1): thermally conductive filler (B2)), preferably (100: 0) to (20:80), more preferably (80:20) to (30:70) is there.
- BET specific surface area means that measured by the following method. First, a mixed gas of nitrogen and helium is introduced into a BET specific surface area measuring apparatus, and a sample cell containing a sample (an object to be measured for BET specific surface area) is immersed in liquid nitrogen to adsorb nitrogen gas to the sample surface. After reaching adsorption equilibrium, the sample cell is placed in a water bath and warmed to room temperature, and nitrogen adhering to the sample is desorbed. Since the mixing ratio of the gas before and after passing through the sample cell changes during the adsorption and desorption of nitrogen gas, this change is detected by a thermal conductivity detector (TCD) using a gas with a constant mixing ratio of nitrogen and helium as a control.
- TCD thermal conductivity detector
- the adsorption amount and desorption amount of nitrogen gas are obtained.
- a unit amount of nitrogen gas is introduced into the apparatus for calibration, and the surface area value corresponding to the value detected by TCD is obtained to obtain the surface area of the sample.
- the BET specific surface area can be obtained by dividing the surface area by the mass of the sample.
- a polyfunctional epoxy compound (E) is used for the heat conductive pressure-sensitive-adhesive composition (F) and heat conductive pressure-sensitive-adhesive sheet-like molded object (G) of this invention.
- the polyfunctional epoxy compound (E) can react with the organic acid group in the (meth) acrylic acid ester polymer (A1) to form a crosslinked structure.
- the (meth) acrylate monomer ( ⁇ 1) contains a monomer having an organic acid group, it can react with the organic acid group.
- a crosslinked structure can be formed in the polymer containing the structural unit derived from the monomer ( ⁇ 1).
- the polyfunctional epoxy compound (E) has a viscosity at 25 ° C. of 600 mPa ⁇ s or less, preferably 500 mPa ⁇ s or less, and more preferably 400 mPa ⁇ s or less. If the viscosity of the polyfunctional epoxy compound is too high, the polyfunctional epoxy compound is difficult to uniformly disperse in the heat conductive pressure sensitive adhesive composition and the mixed composition that forms the base of the heat conductive pressure sensitive adhesive sheet-like molded article, It is considered that the cross-linked structure of the polyfunctional epoxy compound is difficult to form uniformly.
- the viscosity of the polyfunctional epoxy compound (E) can be measured in the same manner as the phosphate ester (C) described below.
- the polyfunctional epoxy compound (E) having a certain low viscosity as described above, the polyfunctional monomer (D) and the polyfunctional epoxy compound (E) are thermally conductive and pressure sensitive.
- the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive material are uniformly dispersed in the mixture composition that is the basis of the agent composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G). It is considered that it is easy to form a crosslinked structure uniformly in the adhesive sheet-like molded body (G). As a result, it is possible to obtain a heat conductive pressure-sensitive adhesive composition (F) and a heat conductive pressure-sensitive adhesive sheet-like molded body (G) having improved tensile strength while maintaining flexibility.
- the polyfunctional epoxy compound (E) used in the present invention has a functional group (epoxy group) of 2 to 10,000, and the number of functional groups is preferably 2 to 1000, preferably 2 to 10. It is more preferable.
- the number of functional groups of the polyfunctional epoxy compound (E) is in the above range, the tensile strength and flexibility of the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) It becomes easy to make sex compatible.
- polyfunctional epoxy compound (E) used in the present invention examples include resorcinol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, hydrogenated bisphenol A di Glycidyl ether, glycerol polyglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol diglycidyl ether, pentaerythritol triglycidyl ether, pentaerythritol tetraglycidyl ether, diglycerol tetraglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, etc.
- a polyfunctional epoxy compound (E) may be used individually by 1 type, and may use 2 or more types together.
- the amount of the polyfunctional epoxy compound (E) used in the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) of the present invention is the (meth) acrylic resin composition ( A) is 100 parts by mass, 0.3 parts by mass or more and 5.0 parts by mass or less, preferably 0.4 parts by mass or more and 4.0 parts by mass or less, and 0.5 parts by mass or more and 3.0 parts by mass or less. It is more preferable that the amount is not more than part by mass.
- phosphate ester (C) it is preferable to use phosphate ester (C) for the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded product (G) of the present invention.
- phosphoric ester (C) it becomes easy to give the flame retardance which was excellent in the heat conductive pressure sensitive adhesive composition (F) and the heat conductive pressure sensitive adhesive sheet-like molded object (G).
- phosphoric acid ester (C) is used in large quantities, the handleability of the mixed composition before molding the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) is improved.
- the phosphate ester (C) preferably has a viscosity at 25 ° C. of 3000 mPa ⁇ s or more.
- a viscosity at 25 ° C. of 3000 mPa ⁇ s or more.
- the viscosity of the phosphate ester is measured using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) according to the following procedure.
- a B-type viscometer manufactured by Tokyo Keiki Co., Ltd.
- (1) Weigh 300 ml of phosphate ester in a normal temperature environment and place it in a 500 ml container.
- (2) Stirring rotor No. Select one from 1, 2, 3, 4, 5, 6, and 7 and attach to the viscometer.
- the container containing the phosphate ester is placed on the viscometer, and the rotor is submerged in the condensed phosphate ester in the container.
- the rotation speed is selected from 20, 10, 4, and 2.
- the rotation speed is selected from 20, 10, 4, and 2.
- the value obtained by multiplying the read numerical value by the coefficient A is the viscosity [mPa ⁇ s].
- the coefficient A is the selected rotor No. as shown in Table 1 below. And the number of revolutions.
- the phosphate ester (C) is always liquid in a temperature range of 15 ° C. or more and 100 ° C. or less under atmospheric pressure. If the phosphate ester (C) is liquid when mixed, the workability is good and the heat conductive pressure-sensitive adhesive composition (F) or the heat conductive pressure-sensitive adhesive sheet-like molded body (G) is formed. It becomes easy. When molding the heat conductive pressure-sensitive adhesive composition (F) or the heat conductive pressure-sensitive adhesive sheet-like molded product (G) containing the phosphoric ester (C), heat is applied in an environment of 15 ° C. or higher and 100 ° C. or lower.
- the glass transition temperature of the (meth) acrylic resin composition (A) is set to be equal to or higher than the volatilization or polymerization of monomers contained in the (meth) acrylic resin composition (A). Since it becomes easy to prevent the reaction from starting, the environmental performance and workability can be improved.
- a condensed phosphate ester or a non-condensed phosphate ester can be used as the phosphate ester (C).
- condensed phosphate ester means one having a plurality of phosphate ester moieties in one molecule
- non-condensed phosphate ester means one phosphate ester moiety in one molecule. It means something that exists only. Specific examples of the phosphate ester (C) satisfying the conditions described so far are listed below.
- condensed phosphate ester examples include aromatic condensed phosphate esters such as 1,3-phenylene bis (diphenyl phosphate), bisphenol A bis (diphenyl phosphate), resorcinol bis (diphenyl phosphate); polyoxyalkylene bisdichloroalkyl And halogen-containing condensed phosphates such as phosphates; non-aromatic non-halogen-based condensed phosphates; Of these, aromatic condensed phosphates are preferred because of their relatively low specific gravity, no risk of releasing harmful substances (such as halogens), and availability, and 1,3-phenylenebis (diphenyl phosphate). ), Bisphenol A bis (diphenyl phosphate) is more preferred.
- aromatic condensed phosphate esters such as 1,3-phenylene bis (diphenyl phosphate), bisphenol A bis (diphenyl phosphate), resorcinol bis (diphenyl phosphate); polyoxyal
- non-condensed phosphate ester examples include aromatics such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, cresyl-2,6-xylenyl phosphate, 2-ethylhexyl diphenyl phosphate And phosphoric acid esters; halogen-containing phosphoric acid esters such as tris ( ⁇ -chloropropyl) phosphate, trisdichloropropylphosphate, tris (tribromoneopentyl) phosphate; Of these, aromatic phosphates are preferred because no harmful substances (such as halogen) are generated.
- phosphate ester (C) one type may be used alone, or two or more types may be used in combination.
- the amount thereof is a (meth) acrylic resin composition.
- the amount of the product (A) is 100 parts by mass, preferably 45 parts by mass to 190 parts by mass, more preferably 55 parts by mass to 150 parts by mass, and 70 parts by mass to 120 parts by mass. Is more preferable.
- foaming agents include foaming aids; flame retardant thermally conductive inorganic compounds such as metal hydroxides and metal salt hydrates other than the above-described thermally conductive filler (B); glass Fiber; Thermally conductive inorganic compound other than the above-mentioned thermally conductive filler (B) such as expanded graphite powder and PITCH carbon fiber; External cross-linking agent; Pigment such as carbon black and titanium dioxide; Other filler such as clay; Nanoparticles such as fullerenes and carbon nanotubes; antioxidants such as polyphenols, hydroquinones, and hindered amines; thickeners such as acrylic polymer particles, fine silica, and magnesium oxide;
- foaming agents including foaming aids
- flame retardant thermally conductive inorganic compounds such as metal hydroxides and metal salt hydrates other than the above-described thermally conductive filler (B); glass Fiber; Thermally conductive inorganic compound other than the above-mentioned thermally conductive filler (B) such as expanded
- the thermally conductive pressure-sensitive adhesive composition (F) of the present invention is prepared by mixing each of the substances described so far to prepare a mixed composition, and then (meth) acrylic acid ester monomer ( ⁇ 1) and Polymerization reaction of polyfunctional monomer (D) and crosslinking of polymer containing structural unit derived from (meth) acrylic acid ester polymer (A1) and / or (meth) acrylic acid ester monomer ( ⁇ 1) It can be obtained by performing at least the reaction.
- the manufacturing method of the heat conductive pressure-sensitive-adhesive composition (F) of this invention contains the (meth) acrylic acid ester polymer (A1) and the (meth) acrylic acid ester monomer ((alpha) 1)
- a step of producing a mixed composition comprising a (meth) acrylic resin composition (A), a thermally conductive filler (B), a polyfunctional monomer (D), and a polyfunctional epoxy compound (E);
- the substance which can be used other than that, the preferable content ratio of each substance, etc. are as above-mentioned, and detailed description is abbreviate
- heating is preferably performed when the polymerization and the crosslinking reaction are performed.
- heating for example, hot air, an electric heater, infrared rays, or the like can be used.
- the heating temperature at this time is preferably a temperature at which the polymerization initiator is efficiently decomposed and the polymerization of the (meth) acrylic acid ester monomer ( ⁇ 1) and the polyfunctional monomer (D) proceeds.
- a temperature range changes with kinds of polymerization initiator to be used 100 to 200 degreeC is preferable and 130 to 180 degreeC is more preferable.
- the heat conductive pressure-sensitive adhesive sheet-like molded product (G) of the present invention is prepared by mixing each of the substances described so far to prepare a mixed composition, and molding the mixed composition into a sheet shape, or While forming the mixed composition into a sheet, the polymerization reaction of the (meth) acrylate monomer ( ⁇ 1) and the polyfunctional monomer (D), the (meth) acrylate polymer (A1) and It can be obtained by performing at least a crosslinking reaction of a polymer containing a structural unit derived from the (meth) acrylic acid ester monomer ( ⁇ 1).
- the manufacturing method of the heat conductive pressure-sensitive-adhesive sheet-like molded product (G) of the present invention comprises (meth) acrylic acid ester polymer (A1) and (meth) acrylic acid ester monomer ( ⁇ 1).
- a mixed composition containing a (meth) acrylic resin composition (A), a thermally conductive filler (B), a polyfunctional monomer (D), and a polyfunctional epoxy compound (E) is prepared.
- heating is preferably performed when the polymerization and the crosslinking reaction are performed.
- heating for example, hot air, an electric heater, infrared rays, or the like can be used.
- the heating temperature at this time is preferably a temperature at which the polymerization initiator is efficiently decomposed and the polymerization of the (meth) acrylic acid ester monomer ( ⁇ 1) and the polyfunctional monomer (D) proceeds.
- a temperature range changes with kinds of polymerization initiator to be used 100 to 200 degreeC is preferable and 130 to 180 degreeC is more preferable.
- the method for forming the above mixed composition into a sheet is not particularly limited. Suitable methods include, for example, a casting method in which the mixed composition is applied onto a release film such as a release-treated polyester film, and if necessary, the release composition may be subjected to two release treatments. Examples of the method include a method of passing between rolls, and a method of controlling the thickness through a die when the mixed composition is extruded using an extruder.
- the heat conductive pressure-sensitive adhesive sheet-like molded product (G) of the present invention can be provided with excellent flexibility and tensile strength even if it is molded thinner than the conventional heat conductive pressure-sensitive adhesive sheet-like molded product. Further, by reducing the thickness of the heat conductive pressure-sensitive adhesive sheet-like molded body (G), the thermal resistance in the thickness direction of the heat conductive pressure-sensitive adhesive sheet-like molded body (G) can be lowered.
- the thickness of the heat conductive pressure-sensitive adhesive sheet-like molded body (G) can be, for example, 0.05 mm or more and 3.0 mm or less, preferably 0.1 mm or more, and 1.0 mm or less. Is preferable, and it is more preferable that it is 0.5 mm or less.
- the heat conductive pressure-sensitive adhesive sheet-shaped molded body (G) By setting the heat conductive pressure-sensitive adhesive sheet-shaped molded body (G) to the above lower limit or more, air is entrained when the heat conductive pressure-sensitive adhesive sheet-shaped molded body (G) is applied to the heating element and the heat radiating body. It is easy to prevent this, and as a result, it is possible to prevent an increase in thermal resistance and improve the workability in the step of attaching to the adherend.
- the heat conductive pressure-sensitive adhesive sheet-like molded body (G) can be molded on one side or both sides of the substrate.
- the material which comprises the said base material is not specifically limited.
- Specific examples of the substrate include metals having excellent thermal conductivity such as aluminum, copper, stainless steel, and beryllium copper, and polymers having excellent thermal conductivity such as foils of alloys and thermally conductive silicone.
- Plastic films include polyimide, polyethylene terephthalate, polyethylene naphthalate, polytetrafluoroethylene, polyether ketone, polyethersulfone, polymethylpentene, polyetherimide, polysulfone, polyphenylene sulfide, polyamideimide, polyesterimide, aromatic polyamide, etc.
- a heat-resistant polymer film can be used.
- the heat conductive pressure-sensitive-adhesive composition (F) and heat conductive pressure-sensitive-adhesive sheet-like molded object (G) of this invention can be used as some electronic components. In that case, it can also be directly molded on a base material such as a radiator and provided as a part of the electronic component.
- the electronic component include components around a heat generating part in a device having an electroluminescence (EL) light emitting diode (LED) light source, components around a power device such as an automobile, a fuel cell, a solar cell, a battery, and a mobile phone.
- EL electroluminescence
- LED light emitting diode
- PDA personal digital assistant
- notebook computer liquid crystal
- SED surface conduction electron-emitting device display
- PDP plasma display panel
- IC integrated circuit
- the following is an example of the case where it is used for an LED light source.
- the usage method can be illustrated. That is, it is directly attached to the LED light source; sandwiched between the LED light source and a heat dissipation material (heat sink, fan, Peltier element, heat pipe, graphite sheet, etc.); , Heat pipe, graphite sheet, etc.); used as a casing surrounding the LED light source; affixed to the casing surrounding the LED light source; and filling a gap between the LED light source and the casing.
- a heat dissipation material heat sink, fan, Peltier element, heat pipe, graphite sheet, etc.
- a display device having a transmissive liquid crystal panel Backlight devices (TVs, mobile phones, PCs, notebook PCs, PDAs, etc.); vehicle lamps; industrial lighting; commercial lighting; general residential lighting;
- examples of the use of the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) of the present invention other than LED light sources include the following. That is, PDP panel; IC heating part; Cold cathode tube (CCFL); Organic EL light source; Inorganic EL light source; High luminance light emitting LED light source; High luminance light emitting organic EL light source; Etc., the heat conductive pressure-sensitive adhesive composition (F) of the present invention and the heat conductive pressure-sensitive adhesive sheet-like molded product (G) can be used.
- the usage method of the heat conductive pressure-sensitive-adhesive composition (F) and heat conductive pressure-sensitive-adhesive sheet-like molded object (G) of this invention is not limited to the form mentioned above, Other than what was illustrated so far. It can also be used by being attached to a casing or the like of the apparatus. For example, it can be used for an apparatus provided in an automobile or the like.
- the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded body (G) of the present invention can be used in the same manner.
- personal computers houses; televisions; mobile phones; vending machines; refrigerators; solar cells; surface-conduction electron-emitting device displays (SEDs); organic EL displays; inorganic EL displays; Lighting; Organic EL display; Notebook PC; PDA; Fuel cell; Semiconductor device; Rice cooker; Washing machine; Washing and drying machine: Optical semiconductor device combining optical semiconductor elements and phosphors; Etc.
- the heat conductive pressure-sensitive adhesive composition (F) and the heat conductive pressure-sensitive adhesive sheet-like molded product (G) of the present invention are not limited to the above-described usage methods, and may be used in other methods depending on the application. Is also possible.
- used for heat equalization of carpets and warm mats, etc . used as LED light source / heat source sealant; used as solar cell sealant; used as solar cell backsheet Used between the backsheet of the solar cell and the roof; used inside the heat insulating layer inside the vending machine; used inside the housing of the organic EL lighting with a desiccant or a hygroscopic agent; organic EL lighting Use with desiccant and hygroscopic agent on the heat conductive layer inside the housing of the LED; Use with desiccant and hygroscopic agent on the heat conductive layer and heat dissipation layer inside the housing of the organic EL lighting Used for heat conduction layer inside the housing of organic EL lighting, epoxy heat dissipation layer, and on top of it with desiccant and hygroscopic agent; cooling equipment, clothing, towels, sheets, etc.
- the member Used for a pressure member of a fixing device mounted on an image forming apparatus such as an electrophotographic copying machine or an electrophotographic printer; Pressurizing a fixing device mounted on an image forming apparatus such as an electrophotographic copying machine or an electrophotographic printer Used as a member itself; used as a heat flow control heat transfer part for placing a treatment object of a membrane control device; used as a heat flow control heat transfer part for placing a treatment object of a film control device; outer layer of a radioactive substance storage container It can be used between the interior and interior; used in a box body with a solar panel that absorbs sunlight; used between the reflective sheet of the CCFL backlight and the aluminum chassis.
- the heat conductive pressure sensitive adhesive composition (F) according to the present invention, the heat conductive pressure sensitive adhesive sheet-like molded product (G), the method for producing the heat conductive pressure sensitive adhesive composition (F), and In the method for producing a heat conductive pressure-sensitive adhesive sheet-like molded body (G), A preferable heat conductive filler (B) is aluminum hydroxide and / or aluminum oxide.
- the heat conductive pressure-sensitive-adhesive composition (F) which concerns on this invention, the heat conductive pressure-sensitive-adhesive sheet-like molded object (G), the manufacturing method of a heat conductive pressure-sensitive-adhesive composition (F), and heat
- the mixed composition containing 0.3 to 5.0 parts by mass of the polyfunctional epoxy compound (E) having a viscosity at 25 ° C. of 600 mPa ⁇ s or less Preferably, the phosphoric acid ester (C) is further contained in an amount of 45 to 190 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin composition (A).
- the heat conductive pressure-sensitive-adhesive composition (F) which concerns on this invention, the heat conductive pressure-sensitive-adhesive sheet-like molded object (G), the manufacturing method of a heat conductive pressure-sensitive-adhesive composition (F), and heat In the method for producing a conductive pressure-sensitive adhesive sheet-like molded body (G),
- the mixed composition preferably further contains a polymerization initiator in an amount of 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the (meth) acrylic resin composition (A).
- a heat conductive pressure-sensitive adhesive sheet-like molded body was prepared, cut into a size of 30 mm ⁇ 50 mm, and used as a release film (polyethylene terephthalate film subjected to a release treatment. A plurality of sheets from which the “released PET film” was released) were prepared. The cut sheet is pulverized with talc, and the sheet is laminated so as to have a thickness of about 6 mm. A sample of a hardness meter (“CL-150” manufactured by Kobunshi Keiki Co., Ltd., JIS K7312 compliant) is used. I put it on the table.
- CL-150 manufactured by Kobunshi Keiki Co., Ltd., JIS K7312 compliant
- the punching blade (dumbbell No. 1) was attached to a punching device (Dum Bell Ltd. SDL-100), and the screw was securely fastened. Set the plastic plate and punched plate, and punch the heat conductive pressure-sensitive adhesive sheet-shaped product (G) so that the longitudinal direction of the punching device is the MD direction of the heat conductive pressure-sensitive adhesive sheet-shaped product (G).
- a test piece was prepared. Autograph (manufactured by Shimadzu Corp., AGIS-20 kN) was set, and the power was turned on and waited for 15 minutes (load cell: 1 kN). The test conditions (test speed: 300 mm / min) were selected, and the thickness of the test piece measured with a thickness meter (TOYOSEIKI made digital thickness gauge) was input. The test was started with the test piece sandwiched between chucks, and the stress when the test piece broke was read.
- Example 1 A reactor was charged with 100 parts of a monomer mixture composed of 94% 2-ethylhexyl acrylate and 6% acrylic acid, 0.03 parts 2,2′-azobisisobutyronitrile and 700 parts ethyl acetate. Then, after substitution with nitrogen, a polymerization reaction was carried out at 80 ° C. for 6 hours. The polymerization conversion rate was 97%. The obtained polymer was dried under reduced pressure to evaporate ethyl acetate to obtain a viscous solid (meth) acrylic acid ester polymer (A1-1).
- the weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A1-1) was 270,000, and the weight average molecular weight (Mw) / number average molecular weight (Mn) was 3.1.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) were determined in terms of standard polystyrene by gel permeation chromatography using tetrahydrofuran as an eluent.
- a thermostatic bath manufactured by Toki Sangyo Co., Ltd., trade name “Biscomate Meat 150III”
- a Hobart mixer manufactured by Kodaira Manufacturing Co., Ltd., trade name “ACM-5LVT type”, capacity: 5 L
- the temperature control of the Hobart container was set to 60 ° C.
- the rotation speed scale was set to 3
- the mixture was stirred for 10 minutes. This process is referred to as a first mixing process.
- the mixed composition obtained through the first and second mixing steps is hung on a release PET film having a thickness of 75 ⁇ m, and another release PET film having a thickness of 75 ⁇ m is further dropped on the mixed composition. Covered.
- This laminated body in which the mixed composition was sandwiched between the release PET films was passed through a roll having a distance of 0.45 mm between them to form a sheet. Thereafter, the laminate was put into an oven and heated at 150 ° C. for 15 minutes.
- the (meth) acrylic acid ester monomer and the polyfunctional monomer are polymerized and almost simultaneously, the (meth) acrylic acid ester polymer (A1-1) and the (meth) acrylic acid ester
- the monomer polymer was subjected to a crosslinking reaction to obtain a heat conductive pressure-sensitive adhesive sheet-like molded body (hereinafter simply referred to as “sheet”) (G1).
- sheet heat conductive pressure-sensitive adhesive sheet-like molded body
- Example 2 to 6 and Comparative Examples 1 to 3 The sheets (G2 to G6) according to Examples 1 to 6 and the sheets (GC1 to GC4) according to Comparative Examples 1 to 4 are the same as Example 1 except that the composition of each substance is changed as shown in Table 2. ) was produced. The evaluation results are shown in Table 2.
- the polyfunctional epoxy compound used in Example 6 was EX-1310 manufactured by Nagase ChemteX Corporation (functional group number: 3, viscosity: 110 mPa ⁇ s, total chlorine: 0.5%>, epoxy equivalent: 180). It is.
Abstract
Description
本発明の熱伝導性感圧接着剤組成物(F)は、(メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)と、熱伝導性フィラー(B)と、重合性不飽和結合を複数有する多官能性単量体(D)(単に「多官能性単量体(D)」という場合がある。)と、官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)(単に「多官能エポキシ化合物(E)」という場合がある。)と、を含む混合組成物中において、(メタ)アクリル酸エステル単量体(α1)と多官能性単量体(D)との共重合反応、(メタ)アクリル酸エステル単量体(α1)の重合反応、及び、多官能性単量体(D)の重合反応のうち少なくともいずれかの重合反応、並びに、(メタ)アクリル酸エステル重合体(A1)同士の架橋反応、(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体同士の架橋反応、及び、(メタ)アクリル酸エステル重合体(A1)と(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体との架橋反応のうち少なくともいずれかの架橋反応が、少なくとも行われてなるものである。
本発明に用いる(メタ)アクリル樹脂組成物(A)は、(メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含んでいる。なお、上述したように、熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)を得る際には(メタ)アクリル酸エステル単量体(α1)由来の構造単位を生じる重合体を得る重合反応と、(メタ)アクリル酸エステル重合体(A1)及び/又は(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とが行われる。当該重合反応及び架橋反応を行うことによって(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体は、(メタ)アクリル酸エステル重合体(A1)の成分と混合及び/又は一部結合する。
本発明に用いることができる(メタ)アクリル酸エステル重合体(A1)は特に限定されないが、ガラス転移温度が-20℃以下となる単独重合体を形成する(メタ)アクリル酸エステル単量体の単位(a1)、及び、有機酸基を有する単量体単位(a2)を含有することが好ましい。
(メタ)アクリル酸エステル単量体(α1)は、(メタ)アクリル酸エステル単量体を含有するものであれば特に限定されないが、ガラス転移温度が-20℃以下となる単独重合体を形成する(メタ)アクリル酸エステル単量体(a5m)を含有するものであることが好ましい。
熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)を得る際に、(メタ)アクリル酸エステル単量体(α1)及び後述する多官能性単量体(D)は重合する。その重合を促進するため、重合開始剤を用いることが好ましい。当該重合開始剤としては、光重合開始剤、アゾ系熱重合開始剤、有機過酸化物熱重合開始剤などが挙げられる。得られる熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)に優れた接着性を付与する等の観点からは、有機過酸化物熱重合開始剤を用いることが好ましい。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)には多官能性単量体(D)を用いる。多官能性単量体(D)としては、(メタ)アクリル酸エステル単量体(α1)に含まれる単量体と共重合可能なものを用いる。また、多官能性単量体(D)は重合性不飽和結合を複数有しており、該不飽和結合を末端に有することが好ましい。このような多官能性単量体(D)を用いることによって、共重合体に分子内及び/又は分子間架橋を導入して、熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)の感圧接着剤としての凝集力を高めることができる。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)には、熱伝導性フィラー(B)を用いる。熱伝導性フィラー(B)は、添加することによって熱伝導性感圧接着剤組成物(F)、熱伝導性感圧接着性シート状成形体(G)の熱伝導性を向上させることができ、熱伝導率が1W/m・K以上であるフィラーである。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)には、多官能エポキシ化合物(E)を用いる。多官能エポキシ化合物(E)は、(メタ)アクリル酸エステル重合体(A1)中の有機酸基と反応して架橋構造を形成し得る。また、同様に、(メタ)アクリル酸エステル単量体(α1)が有機酸基を有する単量体を含有している場合、該有機酸基と反応し得るため、(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体に、架橋構造を形成し得る。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)には、リン酸エステル(C)を用いることが好ましい。リン酸エステル(C)を用いることによって、熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)の優れた難燃性を付与し易くなる。また、リン酸エステル(C)を多量に使用すると熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)を成形する前の混合組成物の取り扱い性が悪化するが、リン酸エステル(C)及び上記熱伝導性フィラー(B1)を併用することによって、リン酸エステル(C)の使用量を抑えても熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)の燃焼時の滴下を抑え難燃性を向上させることができ、混合組成物の取り扱い性も向上する。
リン酸エステルの粘度測定には、B型粘度計(東京計器株式会社製)を用いて、以下に示す手順で行う。
(1)常温の環境でリン酸エステルを300ml計量し、500mlの容器に入れる。
(2)攪拌用ロータNo.1、2、3、4、5、6、7から、いずれかを選択し、粘度計
に取り付ける。
(3)リン酸エステルが入った容器を粘度計の上に置き、ロータを該容器内の縮合リン酸エステルに沈める。このとき、ロータの目印となる凹みが丁度、リン酸エステルの液状界面にくるように沈める。
(4)回転数を20、10、4、2の中から選択する。
(5)攪拌スイッチを入れ、1分後の数値を読み取る。
(6)読み取った数値に、係数Aを掛け算した値が粘度[mPa・s]となる。
なお、係数Aは、下記表1に示すように、選択したロータNo.と回転数とから決まる。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)には、上述した物質以外にも、上述した物質を配合することによる上記効果を妨げない範囲で、公知の各種添加剤を添加することもできる。公知の添加剤としては、発泡剤(発泡助剤を含む。);上述した熱伝導性フィラー(B)以外の金属の水酸化物や金属塩水和物などの難燃性熱伝導無機化合物;ガラス繊維;膨張化黒鉛粉やPITCH系炭素繊維などの上述した熱伝導性フィラー(B)以外の熱伝導性無機化合物;外部架橋剤;カーボンブラック、二酸化チタンなど顔料;クレーなどのその他の充填材;フラーレン、カーボンナノチューブなどのナノ粒子;ポリフェノール系、ハイドロキノン系、ヒンダードアミン系などの酸化防止剤;アクリル系ポリマー粒子、微粒シリカ、酸化マグネシウムなど増粘剤;などを挙げることができる。
本発明の熱伝導性感圧接着剤組成物(F)は、これまでに説明した各物質を混合して混合組成物を作製した後、(メタ)アクリル酸エステル単量体(α1)及び多官能性単量体(D)の重合反応と、(メタ)アクリル酸エステル重合体(A1)及び/又は(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とを少なくとも行うことにより得ることができる。
本発明の熱伝導性感圧接着剤組成物(F)及び熱伝導性感圧接着性シート状成形体(G)は、電子部品の一部として用いることができる。その際、放熱体のような基材上に直接的に成形して電子部品の一部として提供することもできる。当該電子部品の具体例としては、エレクトロルミネッセンス(EL)、発光ダイオード(LED)光源を有する機器における発熱部周囲の部品、自動車等のパワーデバイス周囲の部品、燃料電池、太陽電池、バッテリー、携帯電話、携帯情報端末(PDA)、ノートパソコン、液晶、表面伝導型電子放出素子ディスプレイ(SED)、プラズマディスプレイパネル(PDP)、又は集積回路(IC)など発熱部を有する機器や部品を挙げることができる。
好ましい熱伝導性フィラー(B)は、水酸化アルミニウム及び/又は酸化アルミニウムである。
また、本発明に係る熱伝導性感圧接着剤組成物(F)、熱伝導性感圧接着性シート状成形体(G)、熱伝導性感圧接着剤組成物(F)の製造方法、および、熱伝導性感圧接着性シート状成形体(G)の製造方法において、
(メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)を100質量部と、熱伝導性フィラー(B)を90質量部以上1200質量部以下と、重合性不飽和結合を複数有する多官能性単量体(D)を0.2質量部以上8質量部以下と、官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)を0.3質量部以上5.0質量部以下と、を含む混合組成物は、
好ましくは、さらにリン酸エステル(C)を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して45質量部以上190質量部以下含む。
また、本発明に係る熱伝導性感圧接着剤組成物(F)、熱伝導性感圧接着性シート状成形体(G)、熱伝導性感圧接着剤組成物(F)の製造方法、および、熱伝導性感圧接着性シート状成形体(G)の製造方法において、
前記混合組成物は、好ましくは、さらに重合開始剤を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して0.01質量部以上10質量部以下含む。
後述するように熱伝導性感圧接着性シート状成形体(G)を作製して30mm×50mmの大きさに切り出し、作製時に用いた離型フィルム(離型処理を施したポリエチレンテレフタレートフィルム。以下、「離型PETフィルム」という。)を剥離したシートを複数枚用意した。この切り出したシートにタルクを使用して粉打ちを行い、6mm前後の厚みになるように同シートを積層し、硬度計(高分子計器株式会社製「CL-150」、JIS K7312準拠)の試料台上に載せた。その後、ダンパーを落として測定を開始し、ダンパーが試料に着いた時点から20秒後の値を硬度の測定値として読み取った。その結果を表2に示した。なお、離型PETフィルムから剥離する際に、千切れて剥離できなかったものについては、評価不能とした。
後述するように熱伝導性感圧接着性シート状成形体(G)を作製し、作製時に用いた離型PETフィルムを剥離して下記方法で破断強度を測定した。その結果を表2に示した。なお、離型PETフィルムから剥離する際に、千切れて剥離できなかったものについては、評価不能とした。
(実施例1)
反応器に、アクリル酸2-エチルヘキシル94%とアクリル酸6%とからなる単量体混合物100部、2,2’-アゾビスイソブチロニトリル0.03部及び酢酸エチル700部を入れて均一に溶解し、窒素置換後、80℃で6時間重合反応を行った。重合転化率は97%であった。得られた重合体を減圧乾燥して酢酸エチルを蒸発させ、粘性のある固体状の(メタ)アクリル酸エステル重合体(A1-1)を得た。(メタ)アクリル酸エステル重合体(A1-1)の重量平均分子量(Mw)は270,000、重量平均分子量(Mw)/数平均分子量(Mn)は3.1であった。重量平均分子量(Mw)及び数平均分子量(Mn)は、テトラヒドロフランを溶離液とするゲルパーミエーションクロマトグラフィーにより、標準ポリスチレン換算で求めた。
各物質の配合を表2に示したように変更した以外は実施例1と同様にして、実施例1~6に係るシート(G2~G6)及び比較例1~4に係るシート(GC1~GC4)を作製した。評価結果を表2に示す。なお、実施例6で用いた多官能エポキシ化合物は、ナガセケムテックス株式会社製のEX-1310(官能基数:3、粘度:110mPa・s、全塩素:0.5%>、エポキシ当量:180)である。
Claims (17)
- (メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)を100質量部と、
熱伝導性フィラー(B)を90質量部以上1200質量部以下と、
重合性不飽和結合を複数有する多官能性単量体(D)を0.2質量部以上8質量部以下と、
官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)を0.3質量部以上5.0質量部以下と、を含む混合組成物中において、前記(メタ)アクリル酸エステル単量体(α1)及び前記多官能性単量体(D)の重合反応と、前記(メタ)アクリル酸エステル重合体(A1)及び/又は前記(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とが行われてなる、熱伝導性感圧接着剤組成物(F)。 - 前記熱伝導性フィラー(B)が、水酸化アルミニウム及び/又は酸化アルミニウムである、請求項1に記載の熱伝導性感圧接着剤組成物(F)。
- 前記混合組成物が、さらにリン酸エステル(C)を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して45質量部以上190質量部以下含む、請求項1又は2に記載の熱伝導性感圧接着剤組成物(F)。
- 前記混合組成物が、さらに重合開始剤を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して0.01質量部以上10質量部以下含む、請求項1~3のいずれか1項に記載の熱伝導性感圧接着剤組成物(F)。
- (メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)を100質量部と、
熱伝導性フィラー(B)を90質量部以上1200質量部以下と、
重合性不飽和結合を複数有する多官能性単量体(D)を0.2質量部以上8質量部以下と、
官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)を0.3質量部以上5.0質量部以下と、を含む混合組成物をシート状に成形した後、又は前記混合組成物をシート状に成形しながら、前記(メタ)アクリル酸エステル単量体(α1)及び前記多官能性単量体(D)の重合反応と、前記(メタ)アクリル酸エステル重合体(A1)及び/又は前記(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とが行われてなる、熱伝導性感圧接着性シート状成形体(G)。 - 前記熱伝導性フィラー(B)が、水酸化アルミニウム及び/又は酸化アルミニウムである、請求項5に記載の熱伝導性感圧接着性シート状成形体(G)。
- 前記混合組成物が、さらにリン酸エステル(C)を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して45質量部以上190質量部以下含む、請求項5又は6に記載の熱伝導性感圧接着性シート状成形体(G)。
- 前記混合組成物が、さらに重合開始剤を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して0.01質量部以上10質量部以下含む、請求項5~7のいずれか1項に記載の熱伝導性感圧接着性シート状成形体(G)。
- (メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)を100質量部と、
熱伝導性フィラー(B)を90質量部以上1200質量部以下と、
重合性不飽和結合を複数有する多官能性単量体(D)を0.2質量部以上8質量部以下と、
官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)を0.3質量部以上5.0質量部以下と、を含む混合組成物を作製する工程、並びに、
前記混合組成物中において、前記(メタ)アクリル酸エステル単量体(α1)及び前記多官能性単量体(D)の重合反応と、前記(メタ)アクリル酸エステル重合体(A1)及び/又は前記(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とを行う工程、を含む、熱伝導性感圧接着剤組成物(F)の製造方法。 - 前記熱伝導性フィラー(B)が、水酸化アルミニウム及び/又は酸化アルミニウムである、請求項9に記載の熱伝導性感圧接着剤組成物(F)の製造方法。
- 前記混合組成物が、さらにリン酸エステル(C)を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して45質量部以上190質量部以下含む、請求項9又は10に記載の熱伝導性感圧接着剤組成物(F)の製造方法。
- 前記混合組成物が、さらに重合開始剤を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して0.01質量部以上10質量部以下含む、請求項9~11のいずれか1項に記載の熱伝導性感圧接着剤組成物(F)の製造方法。
- (メタ)アクリル酸エステル重合体(A1)、及び、(メタ)アクリル酸エステル単量体(α1)を含む(メタ)アクリル樹脂組成物(A)を100質量部と、
熱伝導性フィラー(B)を90質量部以上1200質量部以下と、
重合性不飽和結合を複数有する多官能性単量体(D)を0.2質量部以上8質量部以下と、
官能基を2以上10000以下有し、且つ、25℃における粘度が600mPa・s以下である、多官能エポキシ化合物(E)を0.3質量部以上5.0質量部以下と、を含む混合組成物を作製する工程、並びに、
前記混合組成物をシート状に成形した後、又は、前記混合組成物をシート状に成形しながら、前記(メタ)アクリル酸エステル単量体(α1)及び前記多官能性単量体(D)の重合反応と、前記(メタ)アクリル酸エステル重合体(A1)及び/又は前記(メタ)アクリル酸エステル単量体(α1)由来の構造単位を含む重合体の架橋反応とを行う工程、を含む、熱伝導性感圧接着性シート状成形体(G)の製造方法。 - 前記熱伝導性フィラー(B)が、水酸化アルミニウム及び/又は酸化アルミニウムである、請求項13に記載の熱伝導性感圧接着性シート状成形体(G)の製造方法。
- 前記混合組成物が、さらにリン酸エステル(C)を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して45質量部以上190質量部以下含む、請求項13又は14に記載の熱伝導性感圧接着性シート状成形体(G)の製造方法。
- 前記混合組成物が、さらに重合開始剤を、前記(メタ)アクリル樹脂組成物(A)100質量部に対して0.01質量部以上10質量部以下含む、請求項13~15のいずれか1項に記載の熱伝導性感圧接着性シート状成形体(G)の製造方法。
- 放熱体及び該放熱体に貼合された請求項1~4のいずれか1項に記載の熱伝導性感圧接着剤組成物(F)、又は、放熱体及び該放熱体に貼合された請求項5~8のいずれか1項に記載の熱伝導性感圧接着性シート状成形体(G)、を備えた電子部品。
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JPH10292158A (ja) * | 1997-04-17 | 1998-11-04 | Nitto Denko Corp | 熱伝導性感圧接着シ―ト類の製造方法 |
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