WO2017216947A1 - 導電性粘着剤組成物及び導電性粘着テープ - Google Patents
導電性粘着剤組成物及び導電性粘着テープ Download PDFInfo
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- WO2017216947A1 WO2017216947A1 PCT/JP2016/068056 JP2016068056W WO2017216947A1 WO 2017216947 A1 WO2017216947 A1 WO 2017216947A1 JP 2016068056 W JP2016068056 W JP 2016068056W WO 2017216947 A1 WO2017216947 A1 WO 2017216947A1
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- conductive
- sensitive adhesive
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- adhesive composition
- acrylic copolymer
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
-
- 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
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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
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Definitions
- the present invention relates to a conductive pressure-sensitive adhesive composition that hardly causes peeling, stringing, and decrease in conductivity even when pulled by a repulsive force of an adherend in a high-temperature environment, and a conductive pressure-sensitive adhesive tape using the same. More specifically, the present invention relates to a conductive pressure-sensitive adhesive tape useful for electromagnetic wave shielding or grounding in an electronic device, for example.
- a conductive adhesive tape in which a metal foil is used as a substrate and conductive particles are added to an adhesive layer is useful for electromagnetic wave shielding and grounding applications.
- conductivity and adhesiveness are important performances, and various proposals for improving the performance have been made.
- Patent Document 1 discloses a conductive pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer having a specific thickness and containing 14 to 45 parts by weight of a spherical and / or spike-shaped conductive filler having an aspect ratio of 1.0 to 1.5. ing. And this adhesive tape is different from the adhesive tape using the filament-like conductive fillers and flake-like conductive fillers of each comparative example, even when the adhesive layer is thinned, It is said that it has excellent step properties and further has step absorbability.
- Patent Document 2 discloses a conductive thin pressure-sensitive adhesive sheet containing conductive particles having a particle diameter d50 of 4 to 12 ⁇ m and d85 of 6 to 15 ⁇ m and having a pressure-sensitive adhesive layer having a thickness of 6 to 12 ⁇ m. And even if this adhesive sheet is thin, it is said that it is excellent in adhesiveness and electroconductivity, and also excellent in productivity.
- the thickness t ( ⁇ m) of the pressure-sensitive adhesive layer and the particle size d50 ( ⁇ m) of the conductive particles have a relationship of t ⁇ d50, and the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer is 4 N / 20 mm or more.
- a conductive adhesive tape is disclosed. The pressure-sensitive adhesive tape has stable conductivity even when used for a long period of time or under severe environmental conditions, and further maintains an adhesive force in consideration of workability.
- Patent Document 4 discloses a conductive pressure-sensitive adhesive tape in which the ratio t / d50 between the thickness t ( ⁇ m) of the pressure-sensitive adhesive layer and the particle diameter d50 ( ⁇ m) of the conductive particles is 0.2 or more and 4.0 or less. ing.
- the adhesive tape is said to have stable conductivity even when used for a long period of time or under severe environmental conditions.
- the adhesive tape will not be able to withstand the repulsive force of the FPC and will be peeled off, or stringing (the adhesive layer will be stretched and partially shaped like many threads) There is a risk that this will occur.
- the pressure-sensitive adhesive layer is softened by heat generated inside the electronic device (for example, heat generated by the battery), the possibility of peeling of the pressure-sensitive adhesive tape or stringing becomes higher.
- the adhesive layer is only slightly stretched, the number of contacts between the conductive particles is reduced, the electric resistance value becomes unstable, and the conductivity may be lowered. There is.
- Patent Documents 1 to 4 do not discuss any problems caused by the repulsive force of the adherend when heat is generated inside the device.
- the electrical resistance value of the adhesive tape which uses a spike-like or spherical conductive particle in an Example and uses a filament-like or flake-like conductive particle in a comparative example is measured in a normal state ( [0067] paragraph of Patent Document 1.
- the electrical resistance value of the pressure-sensitive adhesive sheet is measured at 23 ° C. while applying a surface pressure of 20 N (paragraph [0078] of Patent Document 2).
- Patent Documents 3 and 4 the electrical resistance value of the sample is measured under the condition after 85 ° C.
- Patent Documents 1 to 4 when a conductive adhesive tape is stuck in a small and thin electronic device in a small area and heat is generated inside the device, the repulsion of the adherend such as FPC Any problem with the problem that peeling or stringing occurs due to force, or the adhesive layer becomes slightly stretched due to the repulsive force of the adherend such as FPC, and the electrical resistance value becomes unstable. It has not been done. And it is difficult to solve such a problem with the conventional general electroconductive adhesive tape.
- An object of the present invention is to provide a conductive pressure-sensitive adhesive composition that does not easily peel off, string, or decrease in conductivity even when pulled by the repulsive force of an adherend in a high-temperature environment, and a pressure-sensitive adhesive tape using the same There is to do.
- the present invention is a conductive pressure-sensitive adhesive composition containing an acrylic copolymer (A) and conductive particles (B) and having a type 00 durometer hardness of 15 or more at 85 ° C. as defined by ASTM AD402240. is there.
- the present invention is a conductive pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed of the conductive pressure-sensitive adhesive composition on one or both surfaces of a conductive substrate.
- a conductive pressure-sensitive adhesive composition that hardly peels off, strings, or decreases in conductivity even when pulled by the repulsive force of an adherend in a high temperature environment.
- This conductive pressure-sensitive adhesive composition is very useful as a material for forming a pressure-sensitive adhesive layer of a conductive pressure-sensitive adhesive tape.
- a conductive adhesive tape having such a pressure-sensitive adhesive layer is, for example, stuck in a small and thin electronic device with a small area, heat is generated inside the device, and the repulsive force of the adherend is Even when pulled, peeling, stringing, and a decrease in conductivity are unlikely to occur.
- it is not necessary to compress the adhesive tape with a member such as a gasket it is very useful for realizing further downsizing and thinning of electronic devices.
- the conductive pressure-sensitive adhesive composition of the present invention is a composition having a type 00 durometer hardness specified by ASTM D 2240 of 15 or more at 85 ° C., preferably 20 to 90, more preferably 25 to 70.
- the durometer hardness is a value measured immediately after a sample having a thickness of 6 mm is stored in a dryer at 85 ° C. for 1 hour, as described in Examples below.
- the conductive adhesive composition of the present invention has a durometer hardness at a high temperature (85 ° C.) higher than that of a conventional conductive adhesive composition, the conductive adhesive composition is pulled by the repulsive force of the object to be adhered in a high temperature environment.
- peeling and stringing hardly occur.
- the pressure-sensitive adhesive layer is slightly stretched as in the conventional conductive pressure-sensitive adhesive tape, the number of contact points between the conductive particles is reduced, the electric resistance value becomes unstable, and the problem that the conductivity is remarkably lowered hardly occurs.
- the durometer hardness at room temperature and the durometer hardness at high temperature are not necessarily in a proportional relationship. This is because the phenomenon that the hardness is reduced by heating varies depending on the type of material. Therefore, in order to improve the durometer hardness at a high temperature (85 ° C.), instead of simply using the durometer hardness at room temperature as a guide, appropriately adjust the type and blending amount of each component constituting the material, It is important to actually measure at a high temperature (85 ° C.).
- the durometer hardness at high temperature (85 ° C.) of the conductive pressure-sensitive adhesive composition of the present invention is, for example, the types and ratios of the constituent components of the polymer chain of the acrylic copolymer (A), the acrylic copolymer (A). It can be adjusted by appropriately setting various conditions such as the glass transition point (Tg), the molecular weight, the shape and blending amount of the conductive particles (B), and the type and blending amount of the crosslinking agent (C). Furthermore, you may adjust with the kind and compounding quantity of an additive.
- a constituent component of the polymer chain of the acrylic copolymer (A) a constituent component having a high glass transition point (Tg) is used in a relatively large amount, or the acrylic copolymer (A) is used.
- these methods are merely examples, and the present invention is not limited to the conductive adhesive composition obtained by adjusting the durometer hardness by these methods.
- the conductive pressure-sensitive adhesive composition of the present invention contains an acrylic copolymer (A) and conductive particles (B).
- the acrylic copolymer (A) is preferably contained as a base polymer in the composition.
- the conductive particles (B) are components for imparting conductivity to the pressure-sensitive adhesive composition.
- the type of acrylic copolymer (A) used in the present invention is not particularly limited, but (meth) acrylic acid alkyl ester (A1) having an alkyl group having 1 to 3 carbon atoms, and having 4 to 12 carbon atoms. (Meth) acrylic acid alkyl ester (A2), carboxyl group-containing monomer (A3), hydroxyl group-containing monomer (A4), and vinyl acetate (A5) having an alkyl group of Coalescence is preferred.
- the durometer hardness of the conductive adhesive composition of the present invention at a high temperature 85 ° C.
- (meth) acrylic acid alkyl ester (A1) examples include methyl (meth) acrylate, ethyl (meth) acrylate, and propyl (meth) acrylate. Of these, methyl (meth) acrylate is preferred.
- the content of the (meth) acrylic acid alkyl ester (A1) is preferably 20% by mass or less, more preferably 16% by mass in 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A). In the following, it is particularly preferably 2 to 15% by mass.
- (meth) acrylic acid alkyl ester (A2) examples include butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl ( Examples include meth) acrylate and lauryl (meth) acrylate. Of these, butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate are preferable.
- the content of the (meth) acrylic acid alkyl ester (A2) is preferably 50 to 97% by mass, more preferably 50 to 97% by mass, in 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A). 65 to 90% by mass.
- carboxyl group-containing monomer (A3) examples include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, 2-carboxy-1-butene, 2-carboxy-1-pentene and 2-carboxy. Examples include -1-hexene and 2-carboxy-1-heptene. Among these, acrylic acid and methacrylic acid are preferable, and acrylic acid is more preferable.
- the content of the carboxyl-containing monomer (A3) is preferably 3% by mass or more, more preferably 3.5 to 15% by mass in 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A). %, Particularly preferably 7 to 12% by mass.
- hydroxyl group-containing monomer (A4) examples include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate.
- the content of the hydroxyl group-containing monomer (A4) is preferably 0.01 to 2% by mass, more preferably 0.02% by mass, in 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A). 05 to 0.5% by mass.
- the content of vinyl acetate (A5) is preferably 5% by mass or less, more preferably 1 to 4% by mass, in 100% by mass of the constituent component (monomer unit) of the acrylic copolymer (A). is there.
- the polymerization method for obtaining the acrylic copolymer (A) is not particularly limited, but radical solution polymerization is preferred from the viewpoint of easy polymer design.
- an acrylic syrup composed of the acrylic copolymer (A) and its monomer may be prepared first, and the acrylic syrup may be blended with a crosslinking agent (B) and an additional photopolymerization initiator for polymerization.
- acrylic copolymer (A) monomers other than the components (A1) to (A5) may be copolymerized as long as the effects of the present invention are not impaired.
- the weight average molecular weight of the acrylic copolymer (A) is preferably 450,000 or more, more preferably 500,000 to 1,800,000, particularly preferably 550,000 to 1,500,000. This weight average molecular weight is a value measured by the GPC method.
- the durometer hardness at a high temperature (85 ° C.) of the conductive pressure-sensitive adhesive composition of the present invention can be adjusted.
- the theoretical Tg of the acrylic copolymer (A) is preferably ⁇ 55 ° C. or lower, more preferably ⁇ 75 ° C. to ⁇ 57 ° C. This theoretical Tg is a value calculated by the formula of FOX.
- At least the acrylic copolymer (A) is used as a resin component, but other types of additive resin components can be used in combination as long as the effects of the present invention are not impaired.
- Specific examples include tackifier resins such as rosin tackifiers, terpene resins, petroleum resins, terpene phenol resins, and styrene resins.
- the conductive particles (B) used in the present invention are not particularly limited, and known conductive particles known to be usable for the conductive adhesive composition can be used. Specific examples include metal particles made of metals such as nickel, copper, chromium, gold, silver, or alloys or modified products thereof, carbon particles, and graphite particles. Moreover, the conductive resin particle which coat
- the shape of the conductive particles (B) is not particularly limited, and conductive particles having a known shape such as a filament shape, a spike shape, a flake shape, or a spherical shape can be used. Among them, the filament shape, spike shape, and flake shape are preferable, and the filament shape and spike shape are more preferable from the viewpoint that the number of contacts between the conductive particles tends to increase and the electric resistance value is stabilized.
- the size of the conductive particles (B) is not particularly limited, and those having a known size may be used.
- the blending amount of the conductive particles (B) is preferably 2 parts by mass or more, more preferably 3 to 100 parts by mass, particularly preferably 5 to 75 parts by mass with respect to 100 parts by mass of the acrylic copolymer (A). It is.
- the durometer hardness at a high temperature (85 ° C.) of the conductive pressure-sensitive adhesive composition of the present invention can be adjusted.
- the conductive pressure-sensitive adhesive composition of the present invention preferably further contains a crosslinking agent (C).
- a crosslinking agent (C) is a compound mix
- a compound capable of reacting with a carboxyl group and / or a hydroxyl group of the acrylic copolymer (A) is preferable, and an isocyanate crosslinking agent is more preferable.
- Specific examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified prepolymers thereof. Two or more of these may be used in combination.
- the amount of the crosslinking agent (C) is preferably 0.02 to 2 parts by mass, more preferably 0.03 to 1 part by mass, particularly preferably 100 parts by mass of the acrylic copolymer (A). 0.3 to 0.9 parts by mass.
- the durometer hardness at high temperature (85 ° C.) of the conductive pressure-sensitive adhesive composition of the present invention can be adjusted by appropriately changing the blending amount of the crosslinking agent (C).
- the conductive pressure-sensitive adhesive composition of the present invention may further contain additives such as a silane coupling agent, an antioxidant, and a rust preventive as necessary.
- a silane coupling agent containing a glycidyl group is particularly preferable.
- Specific examples include 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane.
- tris- (trimethoxysilylpropyl) isocyanurate Two or more of these may be used in combination.
- the amount of the silane coupling agent is preferably 0.01 to 0.5 parts by weight, more preferably 0.02 to 0.5 parts by weight, particularly 100 parts by weight of the acrylic copolymer (A). The amount is preferably 0.03 to 0.3 parts by mass.
- the antioxidant a hindered phenol antioxidant is particularly preferable.
- the blending amount of the antioxidant is preferably 0.01 to 1 part by mass, more preferably 0.02 to 0.5 part by mass with respect to 100 parts by mass of the acrylic copolymer (A).
- the rust inhibitor for example, imidazole compounds, triazole compounds, tetrazole compounds, and thiadiazole compounds can be used. Of these, triazole compounds are preferred. Specific examples of the triazole compound include benzotriazole, 1-aminobenzotriazole, and 5-aminobenzotriazole. In particular, benzotriazole is preferable.
- the blending amount of the rust inhibitor (F) is preferably 0.1 to 10 parts by mass, more preferably 0.3 to 5 parts by mass, and particularly preferably 0 with respect to 100 parts by mass of the acrylic copolymer (A). 0.5-3 parts by mass.
- the conductive pressure-sensitive adhesive composition of the present invention may contain additives other than the silane coupling agent, antioxidant, and rust inhibitor described above, as necessary. Specifically, for example, tackifiers, plasticizers, softeners, metal deactivators, and pigments that are known to be added to this type of conductive adhesive composition can be added. And the durometer hardness in the high temperature (85 degreeC) of the conductive adhesive composition of this invention can be adjusted by changing suitably the kind and addition amount of various additives.
- the conductive pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer formed of the conductive pressure-sensitive adhesive composition of the present invention on one surface or both surfaces of a conductive substrate.
- the conductivity of the substrate also contributes to the effect of suppressing electrostatic charging and the effect of shielding electromagnetic waves.
- a metal substrate particularly a metal foil
- a conductive nonwoven fabric substrate or a conductive cloth substrate is preferable.
- Specific examples of the metal constituting the conductive substrate include copper, aluminum, nickel, stainless steel, iron, chromium, and titanium. Of these, copper and aluminum are preferred, and copper is most preferred.
- the thickness of the conductive substrate is preferably 3 to 50 ⁇ m, more preferably 5 to 35 ⁇ m, and particularly preferably 6 to 20 ⁇ m.
- the thickness of the pressure-sensitive adhesive layer is preferably 2 to 100 ⁇ m, more preferably 3 to 50 ⁇ m, particularly preferably 5 to 30 ⁇ m, and most preferably 7 to 20 ⁇ m.
- the pressure-sensitive adhesive layer may be formed only on one side of the conductive substrate, or may be formed on both sides to form a double-sided pressure-sensitive adhesive tape.
- the pressure-sensitive adhesive layer can be formed by crosslinking reaction of the conductive pressure-sensitive adhesive composition of the present invention.
- a pressure-sensitive adhesive layer can be formed on a conductive substrate by applying a conductive pressure-sensitive adhesive composition on a conductive substrate and causing a crosslinking reaction by heating.
- the conductive pressure-sensitive adhesive composition is applied onto a release paper or other film, and is subjected to a crosslinking reaction by heating to form a pressure-sensitive adhesive layer, and this pressure-sensitive adhesive layer is bonded to one or both sides of the conductive substrate.
- a coating device such as a roll coater, a die coater, or a lip coater can be used.
- the solvent in the conductive pressure-sensitive adhesive composition can be removed together with the crosslinking reaction by heating.
- the conductive pressure-sensitive adhesive composition of the present invention is very useful as a material for forming a pressure-sensitive adhesive layer of a conductive pressure-sensitive adhesive tape having a conductive substrate and a pressure-sensitive adhesive layer as described above.
- the use of the conductive adhesive composition of the present invention is not limited to this.
- the conductive pressure-sensitive adhesive composition of the present invention may be formed into a sheet and used as a baseless type pressure-sensitive adhesive sheet, or dissolved in a solvent and applied as a liquid pressure-sensitive adhesive or adhesive. May be.
- part means parts by mass
- % means mass%
- the weight average molecular weight (Mw) of the acrylic copolymer (A) is a value obtained by measuring the molecular weight in terms of standard polystyrene of the acrylic copolymer with the following measuring apparatus and conditions by the GPC method.
- ⁇ Device LC-2000 series (manufactured by JASCO Corporation) -Column: Shodex KF-806M x 2 and Shodex KF-802 x 1-Eluent: Tetrahydrofuran (THF) ⁇ Flow rate: 1.0 mL / min ⁇ Column temperature: 40 ° C.
- ⁇ Injection volume 100 ⁇ L
- Detector Refractometer (RI)
- Measurement sample A solution in which acrylic polymer is dissolved in THF to prepare a solution having an acrylic polymer concentration of 0.5 mass%, and dust is removed by filtration through a filter.
- the theoretical Tg is a value calculated by the FOX equation.
- Conductive particles (B1) and cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 1 and mixed.
- An adhesive composition was prepared.
- This conductive pressure-sensitive adhesive composition was applied onto a silicone-treated release liner so that the thickness of the pressure-sensitive adhesive layer after drying was 16 ⁇ m. Next, the solvent was removed and dried at 110 ° C. and a crosslinking reaction was performed to form an adhesive layer.
- This pressure-sensitive adhesive layer was bonded to the glossy surface side of an 18 ⁇ m-thick electrolytic copper foil (trade name CF-T9FZ-STD-18, manufactured by Fukuda Metal Foil Powder Industry Co., Ltd.). And it cured at 40 degreeC for 3 days, and obtained the electroconductive adhesive tape.
- Example 2 Conductive particles (B1) and cross-linking agent (C) in the amount (parts) shown in Table 2 are added to and mixed with 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 2, and conductive. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1 (however, the thickness of an adhesive layer is 15 micrometers).
- Example 3 Conductive particles (B1) and a cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 3, and mixed. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1.
- FIG. 1 Conductive particles (B1) and a cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 3, and mixed.
- An adhesive composition was prepared.
- the electroconductive adhesive tape was obtained like Example 1.
- Example 4 Conductive particles (B1) and cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 4 and mixed. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1 (however, the thickness of an adhesive layer is 17 micrometers).
- Example 5 Conductive particles (B1) and a crosslinking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 5 and mixed. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1 (however, the thickness of an adhesive layer is 17 micrometers).
- Example 6 Conductive particles (B2) and a cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 1, and mixed. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1.
- FIG. 6 Conductive particles (B2) and a cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 1, and mixed.
- An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1.
- Example 7 Conductive particles (B3) and a cross-linking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 1, and mixed. An adhesive composition was prepared. And the electroconductive adhesive tape was obtained like Example 1 (however, the thickness of an adhesive layer is 17 micrometers).
- Conductive particles (B1) and a crosslinking agent (C) are added in amounts (parts) shown in Table 2 to 100 parts of the solid content of the acrylic copolymer (A) obtained in Production Example 5 and mixed.
- An adhesive composition was prepared.
- the electroconductive adhesive tape was obtained like Example 1 (however, the thickness of an adhesive layer is 17 micrometers).
- the conductive adhesive composition was applied on a silicone-treated release liner so that the thickness after drying was 50 ⁇ m. Next, the solvent was removed and dried at 110 ° C. and a crosslinking reaction was performed to form an adhesive layer, which was then cured at 40 ° C. for 3 days. After curing, this was laminated until the thickness reached 6 mm to obtain a measurement sample.
- This 6 mm thick sample was stored in an environment of 23 ° C., and the type 00 durometer hardness (23 ° C.) defined by ASTM D 2240 was measured. Further, the sample was stored in a dryer at 85 ° C. for 1 hour, and the type 00 durometer hardness (85 ° C.) defined by ASTM D 2240 was measured.
- FIG. 1 is an electron micrograph of the filamentous nickel powder B1
- B2 spike-like nickel powder (manufactured by VALE, trade name nickel powder TYPE123
- FIG. 2 is an electron micrograph of this spike-like nickel powder B2)
- B3 Flaky nickel powder (manufactured by NOVAMET, trade name HCA-1)
- C1 Isocyanate-based crosslinking agent (trade name Coronate (registered trademark) L-45E (solid content concentration 45%) manufactured by Tosoh Corporation)
- the conductive adhesive tape 1 cut to a width of 20 mm and a length of 60 mm was fixed on a 40 mm ⁇ 40 mm square resin plate 2 with the pressure-sensitive adhesive layer 1 b side up.
- a double-sided tape (not shown) was used for this fixing.
- the protruding portion (20 mm) of the conductive adhesive tape 1 was folded upward. In this folded portion, the conductive substrate 1a (copper foil) is on top.
- an insulating tape 3 having a width of 10 mm was attached to the upper half of the conductive adhesive tape 1.
- the tape-like laminate 4 having a width of 10 mm and a length of 80 mm was fixed under the resin plate 2 so as to protrude by 20 mm.
- the tape-like laminate 4 is obtained by bonding an aluminum foil having a thickness of 50 ⁇ m and a polyimide film having a thickness of 125 ⁇ m with a double-sided tape having a thickness of 50 ⁇ m.
- a double-sided tape (not shown) was used and the aluminum foil 4a side was fixed upward.
- one side of the tape-like laminate 4 is folded upward, and the end of the aluminum foil 4a of the tape-like laminate 4 is attached to the adhesive layer 1b of the conductive adhesive tape 1 ( Affixed with a 2 kg roller. And the aluminum foil 4a of the tape-shaped laminated body 4 and the electroconductive base material 1a (copper foil) of the electroconductive adhesive tape 1 were connected to the tester terminal 5, respectively.
- the conductive adhesive tapes of Examples 1 to 7 were at 85 ° C. in a state where the force to stretch the adhesive layer 1b in the thickness direction was applied by the repulsive force of the tape-like laminate 4.
- the increase in electrical resistance value was small. That is, the conductive adhesive tapes of Examples 1 to 7 peeled off even when exposed to a high temperature (85 ° C.) for a long time (24 hours) with a narrow sticking area (5 mm ⁇ 10 mm), and without stringing. The decrease in conductivity was also small.
- the conductive pressure-sensitive adhesive tape of Comparative Example 1 is formed of a conductive pressure-sensitive adhesive composition having a low durometer hardness at 85 ° C., so that stringing occurs in the pressure-sensitive adhesive layer after the acceleration test.
- the electrical resistance value increased greatly, and the conductivity decreased significantly.
- the conductive pressure-sensitive adhesive composition of the present invention is very useful as a material for forming a pressure-sensitive adhesive layer of a conductive pressure-sensitive adhesive tape.
- a conductive pressure-sensitive adhesive tape having such a pressure-sensitive adhesive layer is useful, for example, for electromagnetic wave shielding and grounding applications for preventing adverse effects of static electricity and electromagnetic waves inside electronic equipment. Moreover, even if it is pulled by an internal repulsive force, it is suitable for applications that require that peeling, stringing, and decrease in conductivity hardly occur.
- portable electronic devices such as mobile phones, smartphones, wearable terminals, tablets, car navigation systems, cameras, audio-visual devices, game machines, information devices, etc.
- members of electronic devices that are reduced in size and thinned Can be used very favorably.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Conductive Materials (AREA)
- Non-Insulated Conductors (AREA)
Abstract
Description
本発明の導電性粘着剤組成物は、ASTM D 2240で規定されるタイプ00デュロメータ硬さが85℃において15以上であり、好ましくは20~90、より好ましくは25~70の組成物である。このデュロメータ硬さは、具体的には後述する実施例に記載の通り、厚さ6mmのサンプルを85℃の乾燥機内で1時間保管し、その直後に測定した値である。
本発明の導電性粘着テープは、導電性基材の片面又は両面に、本発明の導電性粘着剤組成物により形成された粘着剤層を有する。この基材の導電性も、静電気の帯電を抑制する効果や電磁波を遮蔽する効果に寄与する。導電性基材としては、金属製基材(特に金属箔)や導電性不織布基材、導電性布基材が好ましい。導電性基材を構成する金属の具体例としては、銅、アルミニウム、ニッケル、ステンレス、鉄、クロム、チタンが挙げられる。中でも、銅、アルミニウムが好まく、銅が最も好ましい。導電性基材の厚さは、好ましくは3~50μm、より好ましくは5~35μm、特に好ましくは6~20μmである。
攪拌機、温度計、還流冷却器及び窒素ガス導入管を備えた反応装置に、表1に示す量(%)の成分(A1)~(A5)と、酢酸エチル、連鎖移動剤としてn-ドデカンチオール及び過酸化物系ラジカル重合開始剤としてラウリルパーオキサイド0.1部を仕込んだ。反応装置内に窒素ガスを封入し、攪拌しながら窒素ガス気流下で68℃、3時間、その後78℃、3時間で重合反応させた。次いで室温まで冷却し、酢酸エチルを追加した。これにより、表1に示す理論Tg、重量平均分子量(Mw)及び濃度のアクリル系共重合体(A)を得た。
・装置:LC-2000シリーズ(日本分光株式会社製)
・カラム:Shodex KF-806M×2本、Shodex KF-802×1本
・溶離液:テトラヒドロフラン(THF)
・流速:1.0mL/分
・カラム温度:40℃
・注入量:100μL
・検出器:屈折率計(RI)
「MA」:メチルアクリレート
「2-EHA」:2-エチルヘキシルアクリレート
「BA」:n-ブチルアクリレート
「AA」:アクリル酸
「4-HBA」:4-ヒドロキシブチルアクリレート
「HEMA」:2-ヒドロキシエチルメタクリレート
「2-EHA」:2-ヒドロキシエチルアクリレート
「Vac」:酢酸ビニル
製造例1で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。
製造例2で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た(但し粘着剤層の厚みは15μm)。
製造例3で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た。
製造例4で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た(但し粘着剤層の厚みは17μm)。
製造例5で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た(但し粘着剤層の厚みは17μm)。
製造例1で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B2)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た。
製造例1で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B3)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た(但し粘着剤層の厚みは17μm)。
製造例5で得たアクリル系共重合体(A)の固形分100部に対して、導電性粒子(B1)、架橋剤(C)を表2に示す量(部)加えて混合し、導電性粘着剤組成物を調製した。そして、実施例1と同様にして導電性粘着テープを得た(但し粘着剤層の厚みは17μm)。
導電性粘着剤組成物をシリコーン処理された離型ライナー上に、乾燥後の厚さが50μmになるように塗布した。次いで、110℃で溶媒を除去・乾燥すると共に架橋反応させて、粘着剤層を形成し、40℃で3日間養生した。養生後、これを厚さが6mmになるまで積層し、測定サンプルとした。この厚さ6mmのサンプルを23℃の環境下で保管し、ASTM D 2240で規定されるタイプ00デュロメータ硬さ(23℃)を測定した。さらに、サンプルを85℃の乾燥機内で1時間保管し、ASTM D 2240で規定されるタイプ00デュロメータ硬さ(85℃)を測定した。
「B1」:フィラメント状ニッケル粉(NOVAMET社製、商品名ニッケルパウダー525LD、図1はこのフィラメント状ニッケル粉B1の電子顕微鏡写真である。)
「B2」:スパイク状ニッケル粉(VALE社製、商品名ニッケルパウダーTYPE123、図2はこのスパイク状ニッケル粉B2の電子顕微鏡写真である。)
「B3」:フレーク状ニッケル粉(NOVAMET社製、商品名HCA-1)
「C1」:イソシアネート系架橋剤(東ソー社製、商品名コロネート(登録商標)L-45E(固形分濃度45%))
実施例及び比較例で得た導電性粘着テープの電気抵抗値を以下の方法で評価した。結果を表3に示す。
図3(A)に示すように、幅20mm、長さ60mmに裁断した導電性粘着テープ1を、粘着剤層1b側を上にして40mm×40mm角の樹脂板2上に固定した。この固定には、両面テープ(不図示)を用いた。次いで図3(B)に示すように、導電性粘着テープ1のはみ出し部分(20mm)を上側に折り返した。この折り返し部分では、導電性基材1a(銅箔)が上になる。次いで図3(C)に示すように、導電性粘着テープ1の上半分に10mm幅の絶縁テープ3を貼り付けた。次いで図3(D)に示すように、幅10mm、長さ80mmのテープ状積層体4を20mmずつはみ出すように樹脂板2の下に固定した。このテープ状積層体4は、厚さ50μmのアルミ箔と厚さ125μmのポリイミドフィルムを厚さ50μmの両面テープで張り合わせて得たものである。この固定には両面テープ(不図示)を用い、アルミ箔4a側が上になるように固定した。次いで図3(E)に示すように、テープ状積層体4の片方を上側に折り返し、テープ状積層体4のアルミ箔4aの端部を導電性粘着テープ1の粘着剤層1bに貼り付け(貼付面積=5mm×10mm)、2kgローラーで圧着した。そして、テープ状積層体4のアルミ箔4aと導電性粘着テープ1の導電性基材1a(銅箔)を、各々テスター端子5に接続した。
1a 導電性基材
1b 粘着剤層
2 樹脂板
3 絶縁テープ
4 テープ状積層体
4a アルミ箔
5 テスター端子
Claims (7)
- アクリル系共重合体(A)と導電性粒子(B)を含有し、ASTM D 2240で規定されるタイプ00デュロメータ硬さが85℃において15以上である導電性粘着剤組成物。
- 導電性粒子(B)の形状がフィラメント状、スパイク状又はフレーク状である請求項1記載の導電性粘着剤組成物。
- アクリル系共重合体(A)の重量平均分子量が、45万以上である請求項1記載の導電性粘着剤組成物。
- アクリル系共重合体(A)が、3質量%以上のカルボキシル基含有モノマーをポリマー鎖の構成成分として含む請求項1記載の導電性粘着剤組成物。
- アクリル系共重合体(A)の理論Tgが、-55℃以下である請求項1記載の導電性粘着剤組成物。
- 導電性基材の片面又は両面に、請求項1記載の導電性粘着剤組成物により形成された粘着剤層を有する導電性粘着テープ。
- 電子機器内部における電磁波シールド又はアース取りの用途に用いられる請求項6記載の導電性粘着テープ。
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