WO2011093214A1 - 導電性粘着テープ - Google Patents
導電性粘着テープ Download PDFInfo
- Publication number
- WO2011093214A1 WO2011093214A1 PCT/JP2011/051052 JP2011051052W WO2011093214A1 WO 2011093214 A1 WO2011093214 A1 WO 2011093214A1 JP 2011051052 W JP2011051052 W JP 2011051052W WO 2011093214 A1 WO2011093214 A1 WO 2011093214A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- adhesive tape
- pressure
- conductive
- acrylic
- Prior art date
Links
Images
Classifications
-
- 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
-
- 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
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- 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
- C09J7/22—Plastics; Metallised plastics
-
- 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
- C09J7/28—Metal sheet
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- 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
- 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
-
- 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
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/206—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer comprising non-adhesive protrusions
-
- 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
- C09J2301/314—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 layer and/or the carrier being conductive
-
- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
Definitions
- the present invention relates to a conductive adhesive tape. More specifically, the present invention relates to a conductive pressure-sensitive adhesive tape for use in applications such as electrically connecting two separated locations.
- the conductive adhesive tape has electrical conductivity (especially electrical conductivity in the thickness direction), and is used for applications such as electrical conduction between two separated locations, electromagnetic wave shielding, and the like.
- a conductive pressure-sensitive adhesive tape conventionally, for example, a metal foil and a pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) provided on one side of the metal foil are formed.
- a conductive adhesive tape (see, for example, Patent Documents 1 to 3) provided with a conductive portion penetrating the pressure-sensitive adhesive layer and having a terminal portion at the tip thereof, or a conductive filler such as nickel powder in the adhesive substance.
- a conductive pressure-sensitive adhesive tape (for example, see Patent Documents 4 to 5) in which a pressure-sensitive adhesive layer made of a conductive pressure-sensitive adhesive dispersed on a metal foil is known.
- the conductive adhesive tape is often used by being directly attached to a metal adherend in an electronic device or the like for the purpose of electrical conduction.
- the conductive adhesive tape adhering portion of the adherend may be gradually corroded, and further, the conductive substrate (metal foil) of the conductive adhesive tape may be corroded.
- the electrical resistance interface resistance between the adhesive layer of the conductive adhesive tape and the adherends and metal foils
- stable electric conduction There was a problem that the property (conductivity) could not be secured.
- JP-A-8-185714 Japanese Patent Laid-Open No. 10-292155 Japanese Patent Laid-Open No. 11-302615 JP 2004-263030 A JP 2005-277145 A
- An object of the present invention is to provide a conductive pressure-sensitive adhesive tape that has excellent corrosion resistance and can ensure stable electrical conductivity.
- the volume resistance value of the pressure-sensitive adhesive tape is controlled within a specific range, and the total amount of acrylic acid and methacrylate ions extracted when the pressure-sensitive adhesive tape is boiled and extracted, that is, It has been found that by controlling the acrylic acid and methacrylic acid ion components contained in the acrylic pressure-sensitive adhesive layer to be free from moisture, the conductive pressure-sensitive adhesive tape having excellent corrosion resistance can be obtained. .
- the present invention is a pressure-sensitive adhesive tape having at least one acrylic pressure-sensitive adhesive layer, having a volume resistance value of 1 ⁇ 10 1 ⁇ or less, and measured with an ion chromatographic method.
- a conductive pressure-sensitive adhesive tape in which the total amount of acrylic acid ions and methacrylic acid ions extracted under the conditions of 100 ° C. and 45 minutes is 20 ng / cm 2 or less per unit area of the acrylic pressure-sensitive adhesive layer.
- the conductive pressure-sensitive adhesive tape has the acrylic pressure-sensitive adhesive layer on one side of the metal foil, a conductive portion that penetrates the metal pressure-sensitive adhesive layer and has a terminal portion at the tip thereof.
- the conductive adhesive tape thus formed is provided.
- the conductive pressure-sensitive adhesive tape is provided wherein the acrylic pressure-sensitive adhesive layer contains 10 to 500 parts by weight of a conductive filler with respect to the total amount (100 parts by weight) of monomer components constituting the acrylic polymer.
- the conductive adhesive tape having the acrylic adhesive layer on at least one side of the metal foil is provided.
- the conductive pressure-sensitive adhesive tape of the present invention is excellent in corrosion resistance, it does not cause corrosion on the metal adherend and the metal foil that the conductive pressure-sensitive adhesive tape has as a conductive base material. Therefore, stable electrical conductivity can be exhibited.
- the conductive pressure-sensitive adhesive tape of the present invention is excellent in long-term corrosion resistance, it can be suitably used for electronic devices and the like that require stable electrical conductivity over a long period of time.
- FIG. 1 is a schematic view (plan view) showing an example (conductive adhesive tape T 1 ) of the conductive adhesive tape of the present invention.
- FIG. 2 is a schematic view (cross-sectional view taken along line AA in FIG. 1 ) showing an example of the conductive adhesive tape of the present invention (conductive adhesive tape T 1 ).
- FIG. 3 is a schematic view (plan view) showing a test sample used for evaluation of corrosion resistance (resistance value change rate) in Examples.
- the conductive pressure-sensitive adhesive tape of the present invention is a conductive pressure-sensitive adhesive tape having at least one acrylic pressure-sensitive adhesive layer.
- the conductive pressure-sensitive adhesive tape of the present invention may be a double-sided pressure-sensitive adhesive tape in which both surfaces of the tape are adhesive surfaces, or may be a single-sided adhesive tape in which only one surface of the tape is an adhesive surface.
- the term “conductive adhesive tape” includes a sheet-like material, that is, a “conductive adhesive sheet”.
- the surface of the pressure-sensitive adhesive layer may be referred to as “adhesive surface”.
- the conductive pressure-sensitive adhesive tape of the present invention does not have a base material (base material layer) and is a so-called “base-less type” conductive pressure-sensitive adhesive tape (hereinafter sometimes referred to as “base-material-less conductive pressure-sensitive adhesive tape”). It may be a conductive adhesive tape having a base material.
- the substrate-less conductive pressure-sensitive adhesive tape include a double-sided pressure-sensitive adhesive tape composed only of the acrylic pressure-sensitive adhesive layer.
- a single-sided adhesive tape having the acrylic pressure-sensitive adhesive layer on one side of the base material a double-sided pressure-sensitive adhesive tape having the acrylic pressure-sensitive adhesive layer on both sides of the base material, etc. Is mentioned.
- the volume resistance value of the conductive adhesive tape of the present invention is 1 ⁇ 10 1 ⁇ or less, more preferably 1 ⁇ 10 0 ⁇ (1 ⁇ ) or less, and further preferably 1 ⁇ 10 ⁇ 1 ⁇ or less.
- the said volume resistance value can be measured by the four probe method. Specifically, the volume resistance value can be obtained, for example, by a method shown in “(2) Volume resistance value” of [Evaluation] described later, using a test sample shown in FIG.
- “having electrical conductivity (conductivity)” means that the volume resistance value satisfies the above range.
- the amount of the extracted (meth) acrylic acid ions is 5 ng / cm 2 or less because of excellent corrosion resistance over a long period of time and higher temperature and humidity.
- the amount of extracted (meth) acrylic acid ions is the degree of ease with which moisture of acrylic acid ions and methacrylic acid ions from the acrylic pressure-sensitive adhesive layer is obtained when the conductive adhesive tape is placed in a humidified environment. Represents.
- the amount of the extracted (meth) acrylate ions exceeds 20 ng / cm 2 , the effect of (meth) acrylate ions released from the acrylic pressure-sensitive adhesive layer during storage in the presence of moisture such as in a humidified environment. Corrosion tends to occur in metals (metal adherends and metal foils (conductive base materials), etc.), and the corrosion resistance decreases.
- total amount of acrylate ions and methacrylate ions extracted with pure water at 100 ° C. for 45 minutes from the conductive adhesive tape of the present invention measured by ion chromatography is the following method Can be measured.
- the conductive adhesive tape is cut out to an appropriate size, and when a separator is provided, the separator is peeled off to expose the adhesive surface to obtain a test piece.
- a PET film thinness 25 to 50 ⁇ m
- the surface of the acrylic pressure-sensitive adhesive layer (the acrylic pressure-sensitive adhesive layer at least included in the conductive pressure-sensitive adhesive tape of the present invention) is exposed.
- the size of the test piece is preferably 100 cm 2 .
- the said test piece is put into the pure water of temperature 100 degreeC, and it boils for 45 minutes, and boiled extraction of an acrylate ion and a methacrylate ion is performed.
- the total amount (unit: ng) of the acrylate and methacrylate ions in the extract obtained above was measured by ion chromatography (ion chromatography), and the adhesive surface (exposed adhesive) of the test piece was measured.
- the total amount of acrylate and methacrylate ions per unit area (unit: ng / cm 2 ) is calculated.
- the measurement conditions of the ion chromatography method are not particularly limited, but can be measured, for example, under the following conditions.
- (Meth) acrylic acid ions released from moisture from the conductive pressure-sensitive adhesive tape are generally caused by (meth) acrylic acid present in the acrylic pressure-sensitive adhesive layer.
- the (meth) acrylic acid ion is presumed to penetrate into the metal due to moisture under high temperature and high humidity conditions and prevent conduction, but metal (metal adherend and metal foil (conductive substrate)) Etc.), and as a result, electrical conduction is hindered.
- (meth) acrylic acid (particularly acrylic acid) is used in a large amount (for example, 10% by weight or more) as a monomer component constituting an acrylic polymer for the purpose of improving the adhesiveness of the conductive adhesive tape.
- the conductive pressure-sensitive adhesive tape of the present invention has excellent electrical conductivity and is also excellent in corrosion resistance. Therefore, the conductive pressure-sensitive adhesive tape of the present invention is suitably used for applications such as electrical connection between two separated locations, electromagnetic wave shielding applications for electrical / electronic devices and cables, and the like. In particular, because it has excellent long-term corrosion resistance, applications that require stable electrical conductivity for a long period of time, specifically, for example, grounding of printed wiring boards, grounding of external shield cases of electronic devices, It can be used for grounding, internal wiring of power supply devices and electronic devices, etc.
- the acrylic pressure-sensitive adhesive layer in the conductive pressure-sensitive adhesive tape of the present invention may be a pressure-sensitive adhesive layer containing an acrylic polymer composed of an acrylic monomer as an essential monomer (monomer) component as a base polymer.
- an acrylic polymer composed of an acrylic monomer as an essential monomer (monomer) component as a base polymer.
- the content of the acrylic polymer in the acrylic pressure-sensitive adhesive layer is not particularly limited, but is preferably 10 wt% or more (for example, 10 to 100 wt%), more preferably 20 to 99.999% by weight.
- the acrylic pressure-sensitive adhesive for forming the acrylic pressure-sensitive adhesive layer may have any form, for example, an active energy ray-curable pressure-sensitive adhesive, a solvent-type (solution-type) pressure-sensitive adhesive, or an emulsion-type pressure-sensitive adhesive.
- An agent, a hot-melt adhesive (hot melt adhesive), etc. can be used.
- the acrylic pressure-sensitive adhesive layer varies depending on the method of forming the pressure-sensitive adhesive layer, and is not particularly limited.
- the acrylic pressure-sensitive adhesive composition containing an acrylic polymer as an essential component, or a monomer ( Monomer) mixture (sometimes referred to as “monomer mixture”) or a partial polymer thereof.
- the former includes, for example, a so-called solvent-type pressure-sensitive adhesive composition, and the latter includes, for example, a so-called active energy ray-curable pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive composition may further contain a crosslinking agent and other various additives as necessary.
- compositions for forming an adhesive layer includes the meaning of “composition for forming an adhesive layer”.
- the “monomer mixture” means a mixture composed only of monomer components constituting the acrylic polymer.
- the “partially polymerized product” means a composition in which one or more components among the components of the monomer mixture are partially polymerized.
- the substrate is not particularly limited, but is preferably a metal foil from the viewpoint of electrical conductivity.
- a metal foil from the viewpoint of electrical conductivity.
- Copper, aluminum, nickel, silver, iron, and these alloys are mentioned, Among these, aluminum foil and copper foil are preferable from viewpoints, such as cost and workability.
- the metal foil may be subjected to surface treatment such as tin plating.
- the conductive pressure-sensitive adhesive tape of the present invention is not particularly limited as long as it has at least one acrylic pressure-sensitive adhesive layer and the volume resistance value and the amount of extracted (meth) acrylic acid ions are controlled within the above ranges.
- the conductive adhesive tape of the present invention has a configuration in which a conductive path (path for current flow) for controlling the volume resistance value within the above range is formed.
- a conductive adhesive tape which has such a structure For example, the "1st specific aspect" of a conductive adhesive tape of this invention mentioned later, a "2nd specific aspect", etc. are mentioned, for example. It is done.
- the “first specific mode” of the conductive pressure-sensitive adhesive tape of the present invention has the acrylic pressure-sensitive adhesive layer on one side of the metal foil, penetrates the metal pressure-sensitive adhesive layer through the metal foil, and It is a conductive adhesive tape (sometimes referred to as “conductive adhesive tape T 1 ”) having a conductive portion having a terminal portion at the tip.
- the “second specific embodiment” of the conductive pressure-sensitive adhesive tape of the present invention is such that the acrylic pressure-sensitive adhesive layer contains 10 conductive fillers based on the total amount (100 parts by weight) of monomer components constituting the acrylic polymer.
- a conductive adhesive tape containing ⁇ 500 parts by weight (sometimes referred to as “conductive adhesive tape T 2 ”).
- the first specific embodiment of the electroconductive pressure-sensitive adhesive tape of the present invention is on one side of the metal foil having an acrylic pressure-sensitive adhesive layer, the acrylic pressure-sensitive adhesive layer on the metal foil It is a single-sided adhesive tape having a configuration in which a conductive portion that penetrates and has a terminal portion at its tip is formed. Due to the presence of such a conductive portion, electrical conductivity (electric conductivity in the thickness direction) is ensured between the metal foil and the attachment surface of the adherend of the acrylic pressure-sensitive adhesive layer.
- 1 and 2 are schematic views schematically showing the conductive adhesive tape T 1 . In FIG.
- FIG. 1 plane view of the conductive adhesive tape T 1
- 11 indicates a conductive adhesive tape T 1
- 12 indicates a conductive portion
- the conductive portion 12 has a terminal portion 13 at the tip.
- the position pattern of the conductive portion 12 (terminal portion 13) is a so-called dot pattern.
- rows in which the arrangement intervals in the longitudinal direction are a are arranged at intervals b and are adjacent to each other.
- a half-pitch shift between the columns, for example, a and b that are substantially equal can be used.
- FIG. 2 is a cross-sectional view taken along line AA of the conductive adhesive tape T 1 of FIG.
- the conductive pressure-sensitive adhesive tape T 1 11 has an acrylic pressure-sensitive adhesive layer 112 on one side of the metal foil 111, and the metal foil 111 penetrates the acrylic pressure-sensitive adhesive layer 112 and has its tip.
- the conductive portion 12 having the terminal portion 13 is formed on the top.
- the metal foil may be any metal foil having self-supporting properties and electrical conductivity.
- metal foils such as copper, aluminum, nickel, silver, iron, lead and alloys thereof are used.
- aluminum foil and copper foil are preferable from the viewpoint of cost and workability.
- the metal foil may be subjected to a surface treatment such as tin plating.
- the thickness of the metal foil is not particularly limited, and can be selected from a range of about 5 to 500 ⁇ m. However, from the viewpoint of balance between strength and flexibility, it is preferably 8 to 200 ⁇ m, more preferably 10 to 150 ⁇ m. .
- the acrylic pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer containing, as a base polymer, an acrylic polymer composed of an acrylic monomer as an essential monomer component.
- the content of the acrylic polymer in the acrylic pressure-sensitive adhesive layer (100% by weight) is not particularly limited, but is preferably 60% by weight or more (for example, 60 to 100% by weight), more preferably 65 to 99.999% by weight.
- the acrylic polymer is preferably an acrylic polymer composed of a (meth) acrylic acid alkyl ester having a linear or branched alkyl group as an essential monomer component (monomer component).
- said "(meth) acryl” represents “acryl” and / or "methacryl", and others are the same.
- (meth) acrylic acid alkyl ester having a linear or branched alkyl group examples include, for example, methyl (meth) acrylate , Ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, (meth) T-butyl acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Isooctyl (meth) acrylate, nony
- (meth) acrylic acid alkyl esters having an alkyl group having 1 to 10 carbon atoms are preferable, and 2-ethylhexyl acrylate (2EHA), butyl acrylate (BA), and ethyl acrylate (EA) are more preferable.
- Methyl methacrylate (MMA) can be used individually or in combination of 2 or more types.
- the content of the above (meth) acrylic acid alkyl ester is preferably 50 to 100% by weight, more preferably 60 to 99.9% by weight, based on the total amount of monomer components (100% by weight) constituting the acrylic polymer. It is.
- the monomer component constituting the acrylic polymer may further contain a polar group-containing monomer, a polyfunctional monomer, or other copolymerizable monomer as a copolymerization monomer component.
- a polar group-containing monomer for example, the adhesive force to the adherend can be improved, or the cohesive force of the acrylic pressure-sensitive adhesive layer can be increased.
- the said copolymerization monomer component can be used individually or in combination of 2 or more types.
- polar group-containing monomer examples include, for example, carboxyl group-containing monomers such as acrylic acid (AA), methacrylic acid, itaconic acid, maleic acid, fumaric acid, and crotonic acid (maleic anhydride, itaconic anhydride, etc.
- carboxyl group-containing monomers such as acrylic acid (AA), methacrylic acid, itaconic acid, maleic acid, fumaric acid, and crotonic acid (maleic anhydride, itaconic anhydride, etc.
- the polar group-containing monomer is preferably a carboxyl group-containing monomer or a hydroxyl group-containing monomer from the viewpoint of improving adhesiveness, and more preferably acrylic acid (AA), acrylic acid 2- Hydroxyethyl (HEA).
- AA acrylic acid
- HOA acrylic acid 2- Hydroxyethyl
- said polar group containing monomer can be used individually or in combination of 2 or more types.
- the content of the above polar group-containing monomer is preferably 0 to 30% by weight, more preferably 0 to 20% by weight, based on the total amount (100% by weight) of monomer components constituting the acrylic polymer.
- the content of the polar group-containing monomer exceeds 30% by weight, the cohesive force of the acrylic pressure-sensitive adhesive layer becomes too high, and the tackiness may be lowered.
- the total content of (meth) acrylic acid with respect to the total amount of monomer components (100% by weight) constituting the acrylic polymer is preferably 10% by weight or less (for example, 0 to 10% by weight), more preferably 0 to 5% by weight, and still more preferably 0 to 3% by weight.
- the content of (meth) acrylic acid exceeds 10% by weight, the total amount of acrylate ions and methacrylate ions extracted with pure water at 100 ° C. for 45 minutes from the pressure-sensitive adhesive sheet of the present invention is 20 ng / cm. It may not be possible to control to 2 or less.
- polyfunctional monomer examples include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, and (poly) propylene glycol di (meth) acrylate.
- the content of the polyfunctional monomer is preferably 0.5% by weight or less (eg, 0 to 0.5% by weight) with respect to the total amount of monomer components (100% by weight) constituting the acrylic polymer. More preferably, it is 0 to 0.3% by weight. When the content exceeds 0.5% by weight, the cohesive force of the acrylic pressure-sensitive adhesive layer becomes too high, and the tackiness may be lowered. When a crosslinking agent is used, the polyfunctional monomer may not be used. However, when no crosslinking agent is used, the content of the polyfunctional monomer is 0.001 to 0.5 wt. % Is preferable, and more preferably 0.002 to 0.1% by weight.
- Examples of other copolymerizable monomers other than the above polar group-containing monomers and polyfunctional monomers include cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, and the like.
- (Meth) acrylic acid ester having an alicyclic hydrocarbon group (meth) acrylic acid aryl ester such as phenyl (meth) acrylate; vinyl esters such as vinyl acetate and vinyl propionate; aroma such as styrene and vinyltoluene Olefins or dienes such as ethylene, butadiene, isoprene and isobutylene; vinyl ethers such as vinyl alkyl ether; vinyl chloride and the like.
- the acrylic polymer can be prepared by polymerizing the monomer components by a known and conventional polymerization method.
- the polymerization method of the acrylic polymer include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method by active energy ray irradiation (active energy ray polymerization method).
- the solution polymerization method and the active energy ray polymerization method are preferable in terms of transparency and water resistance, and the solution polymerization method is more preferable in terms of cost.
- solvents include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane and methylcyclohexane Organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone.
- a solvent can be used individually or in combination of 2 or more types.
- Examples of the active energy rays irradiated in the active energy ray polymerization (photopolymerization) include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, and electron beams, and ultraviolet rays. Ultraviolet light is preferred.
- the irradiation energy, irradiation time, irradiation method, and the like of the active energy ray are not particularly limited as long as the photopolymerization initiator can be activated to cause a reaction of the monomer component.
- a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) can be used depending on the type of polymerization reaction.
- a polymerization initiator can be used individually or in combination of 2 or more types.
- the thermal polymerization initiator is not particularly limited, and for example, 2,2′-azobisisobutyronitrile, 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2 '-Azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), 2,2'-azobis ( 2,4,4-trimethylpentane), dimethyl-2,2′-azobis (2-methylpropionate) and other azo polymerization initiators; benzoyl peroxide, t-butyl hydroperoxide, di-t-butyl Peroxide, t-butyl peroxybenzoate, dicumyl peroxide, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1 Preferred examples include oil-soluble polymerization initiators such as peroxide polymerization initi
- the said thermal polymerization initiator can be used individually or in combination of 2 or more types.
- the amount of the thermal polymerization initiator used is not particularly limited. For example, it is selected from a range of about 0.01 to 1 part by weight with respect to the total amount of monomer components (100 parts by weight) constituting the acrylic polymer. be able to.
- the photopolymerization initiator is not particularly limited, and examples thereof include benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, ⁇ -ketol photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, and photopolymerization initiators.
- An active oxime photopolymerization initiator, a benzoin photopolymerization initiator, a benzyl photopolymerization initiator, a benzophenone photopolymerization initiator, a ketal photopolymerization initiator, a thioxanthone photopolymerization initiator, or the like can be used.
- benzoin ether photopolymerization initiator examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one, and anisole.
- examples include methyl ether.
- examples of the acetophenone photopolymerization initiator include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 4-phenoxydichloroacetophenone, and 4- (t-butyl). Examples include dichloroacetophenone.
- Examples of the ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1- [4- (2-hydroxyethyl) phenyl] -2-methylpropan-1-one, and the like.
- Examples of the aromatic sulfonyl chloride photopolymerization initiator include 2-naphthalenesulfonyl chloride.
- Examples of the photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime.
- Examples of the benzoin photopolymerization initiator include benzoin.
- Examples of the benzyl photopolymerization initiator include benzyl.
- benzophenone-based photopolymerization initiator examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexyl phenyl ketone, and the like.
- ketal photopolymerization initiator examples include benzyl dimethyl ketal.
- thioxanthone photopolymerization initiator examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone, and the like.
- the amount of the photopolymerization initiator used is not particularly limited. For example, it is preferably 0.01 to 0.2 parts by weight, more preferably based on the total amount (100 parts by weight) of monomer components constituting the acrylic polymer. 0.05 to 0.15 parts by weight.
- the weight average molecular weight of the acrylic polymer is preferably 300,000 to 1,200,000, more preferably 350,000 to 1,000,000, still more preferably 400,000 to 900,000. If the weight average molecular weight of the acrylic polymer is less than 300,000, good adhesive properties may not be exhibited.
- the weight average molecular weight can be controlled by the type of the polymerization initiator, the amount of the polymerization initiator used, the temperature and time during the polymerization, the monomer concentration, the monomer dropping rate, and the like.
- the pressure-sensitive adhesive composition for forming the acrylic pressure-sensitive adhesive layer in the conductive pressure-sensitive adhesive tape T 1 includes a crosslinking agent, a crosslinking accelerator, a tackifier resin (rosin derivative, polyterpene resin, petroleum resin, oil as necessary). Soluble phenols), anti-aging agents, fillers, colorants (pigments and dyes, etc.), UV absorbers, antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, etc. An additive can be used in the range which does not impair the characteristic of this invention.
- various common solvents can also be used.
- the type of the solvent is not particularly limited, and those exemplified as the solvent used in the above solution polymerization can be used.
- the above-mentioned crosslinking agent can crosslink the base polymer (acrylic polymer) of the acrylic pressure-sensitive adhesive layer, can further increase the cohesive force of the acrylic pressure-sensitive adhesive layer, and can control the gel fraction. It does not specifically limit as a crosslinking agent, It can select from a well-known and usual thing suitably, and can use it. Specifically, for example, a polyfunctional melamine compound (melamine crosslinking agent), a polyfunctional epoxy compound (epoxy crosslinking agent), or a polyfunctional isocyanate compound (isocyanate crosslinking agent) is preferably used. Among these, an isocyanate crosslinking agent and an epoxy crosslinking agent are preferable, and an isocyanate crosslinking agent is more preferable.
- a crosslinking agent can be used individually or in mixture of 2 or more types.
- isocyanate crosslinking agent examples include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, and isophorone.
- Alicyclic polyisocyanates such as diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, xylylene diisocyanate, etc.
- epoxy-based crosslinking agent examples include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, , 6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, Pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyg In addition to cisidyl ether,
- the content of the crosslinking agent in the pressure-sensitive adhesive composition is not particularly limited, but is preferably 0 to 10 parts by weight, more preferably 0 to 0 parts by weight with respect to the total amount of monomer components (100 parts by weight) constituting the acrylic polymer. 5 parts by weight.
- the thickness of the acrylic pressure-sensitive adhesive layer is not particularly limited, but is preferably 5 to 120 ⁇ m, more preferably 10 to 90 ⁇ m. If the thickness exceeds 120 ⁇ m, it may be disadvantageous for thinning the product or it may be difficult to form the terminal portion. If the thickness is less than 5 ⁇ m, the acrylic pressure-sensitive adhesive layer is thin, so that stress cannot be dispersed and peeling may easily occur.
- the method for forming the acrylic pressure-sensitive adhesive layer can be a known and commonly used method for forming a pressure-sensitive adhesive layer, and differs depending on the polymerization method of the acrylic polymer and is not particularly limited.
- the following ( Examples of the method include 1) to (3).
- a composition containing a mixture of monomer components constituting an acrylic polymer (monomer mixture) or a partial polymer thereof and, if necessary, additives such as a photopolymerization initiator and a crosslinking agent, on a separator or metal foil Application (coating) is performed, and active energy rays (in particular, ultraviolet rays are preferred) are formed to form an acrylic pressure-sensitive adhesive layer.
- a composition (solution) containing an acrylic polymer, a solvent, and, if necessary, an additive such as a cross-linking agent is applied (coated) on a separator or a metal foil, dried and / or cured, and then acrylic. An adhesive layer is formed.
- the acrylic pressure-sensitive adhesive layer formed in (1) is further dried.
- a known coating method for the application (coating) in the method for forming the acrylic pressure-sensitive adhesive layer, a known coating method can be used, and a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, Dip roll coaters, bar coaters, knife coaters, spray coaters, comma coaters, direct coaters and the like can be used.
- the conductive pressure-sensitive adhesive tape T 1 has other layers (for example, an intermediate layer, an undercoat layer, etc.) as long as the effects of the present invention are not impaired in addition to the metal foil and the acrylic pressure-sensitive adhesive layer. Also good.
- the thickness of the conductive adhesive tape T 1 is not particularly limited, but is preferably 25 to 200 ⁇ m, more preferably 40 to 140 ⁇ m. If the thickness exceeds 200 ⁇ m, it may be disadvantageous for thinning the product. If the thickness is less than 25 ⁇ m, workability may be deteriorated.
- the “thickness of the conductive adhesive tape T 1 ” means the thickness from the surface of the metal foil that does not have the acrylic adhesive layer to the surface of the acrylic adhesive layer.
- a separator may be provided on the adhesive layer surface (adhesive surface) of the conductive adhesive tape T 1 until use.
- the separator is used as a protective material for the acrylic pressure-sensitive adhesive layer, and is peeled off when being applied to an adherend. Note that the separator is not necessarily provided.
- a conventional release paper or the like can be used, and is not particularly limited.
- a substrate having a release treatment layer, a low adhesive substrate made of a fluoropolymer, and a low adhesive substrate made of a nonpolar polymer. Etc. can be used.
- a base material which has the said peeling process layer the plastic film, paper, etc.
- fluoropolymer examples include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, and chlorofluoroethylene-vinylidene fluoride copolymer.
- nonpolar polymer olefin resin (for example, polyethylene, a polypropylene, etc.) etc. are mentioned, for example.
- a separator made of polyethylene or polypropylene from the viewpoint of suppressing the floating of the separator.
- a separator can be formed by a well-known and usual method. Further, the thickness of the separator is not particularly limited.
- the conductive pressure-sensitive adhesive tape T 1 is not particularly limited, but an acrylic pressure-sensitive adhesive layer is formed on one side of the metal foil, and then multiple points of the metal foil are made to appear on the surface of the acrylic pressure-sensitive adhesive layer by bottomless squeezing. And it can manufacture by setting it as a terminal part. Specifically, for example, it can be produced by the methods described in Japanese Utility Model Publication No. 63-46980 and Japanese Patent Application Laid-Open No. 8-185714. An example of the manufacturing method will be described with reference to FIG. First, the acrylic pressure-sensitive adhesive layer 112 is formed on the surface of the metal foil 111 by the method for forming the acrylic pressure-sensitive adhesive layer described above.
- the acrylic pressure-sensitive adhesive layer 112 may be directly formed on the surface of the metal foil 111 (direct copying method), or the acrylic pressure-sensitive adhesive layer 112 is formed on the separator and then transferred to the metal foil 111. By doing (bonding), the acrylic adhesive layer 112 may be provided on the metal foil 111 (transfer method). Next, as necessary, a separator (process separator) is attached on the surface of the acrylic pressure-sensitive adhesive layer 112 to protect the acrylic pressure-sensitive adhesive layer 112.
- the metal foil 111 is squeezed into a cylindrical shape without a bottom using a punch-shaped male die and a die-female die (drawn and formed) to form a conducting portion 12, and then the tip of the cylindrical portion is horizontally leveled outward by pressing.
- the conductive adhesive tape T 1 11 can be manufactured by forming the hook-shaped terminal portion 13 by bending it into two. A plurality of conductive portions 12 (terminal portions 13) are usually formed at an appropriate interval, for example, like a scattered dot pattern shown in FIG.
- the second specific embodiment of the electroconductive pressure-sensitive adhesive tape of the present invention is a conductive adhesive tape having at least one layer of an acrylic pressure-sensitive adhesive layer having electrical conductivity.
- Conductive adhesive tape T 2 are, may be a double-sided adhesive tape may be a one-sided adhesive tape.
- the conductive pressure-sensitive adhesive tape T 2 may be a base material-less conductive pressure-sensitive adhesive tape that does not have a base material (base material layer), or may be a type of conductive pressure-sensitive adhesive tape that has a base material.
- the substrate-less conductive pressure-sensitive adhesive tape include a double-sided pressure-sensitive adhesive tape composed only of the acrylic pressure-sensitive adhesive layer.
- an adhesive tape having the acrylic adhesive layer on at least one side of the substrate one-sided adhesive tape having the acrylic adhesive layer on one side of the substrate, base And a double-sided pressure-sensitive adhesive tape having the acrylic pressure-sensitive adhesive layer on both sides of the material).
- a conductive pressure-sensitive adhesive tape having a metal foil as a base material is more preferable.
- a conductive pressure-sensitive adhesive tape having the acrylic pressure-sensitive adhesive layer on at least one side of the metal foil is more preferable.
- it is a conductive adhesive tape (single-sided adhesive tape) having the above acrylic pressure-sensitive adhesive layer on one side of the metal foil.
- the “base material (base material layer)” does not include a separator that is peeled off when the conductive adhesive tape is used (attached).
- the acrylic pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer containing, as a base polymer, an acrylic polymer composed of an acrylic monomer as an essential monomer (monomer) component, and contains a conductive filler. By containing a conductive filler, a conductive path is formed in the acrylic pressure-sensitive adhesive layer, and electrical conductivity is imparted.
- the content of the acrylic polymer in the acrylic pressure-sensitive adhesive layer (100 wt%) is not particularly limited, but is preferably 10 wt% or more (for example, 10 to 95 wt%), more preferably 20 to 80% by weight.
- the acrylic polymer As the acrylic polymer, the acrylic polymer exemplified in the section of [Conductive adhesive tape T 1 (first specific embodiment)] can be preferably used.
- the conductive filler known and commonly used fillers can be used.
- An example of the filler is a resin-coated filler.
- a metal filler and / or a metal-coated filler are preferable.
- the shape of the conductive filler is not particularly limited, but is preferably spherical and / or spiked, more preferably spherical.
- a spherical and / or spike-shaped conductive filler By using a spherical and / or spike-shaped conductive filler, it becomes easy to uniformly disperse in the acrylic pressure-sensitive adhesive layer, and thus it may be easy to achieve both the adhesiveness and electrical conductivity of the conductive pressure-sensitive adhesive tape.
- filament-like, flake-like or resinous fillers the dispersibility is reduced and coarse aggregates are formed, or the fillers are aligned in the horizontal direction with the adhesive surface in the acrylic adhesive layer, and the thickness direction Since it is difficult to exhibit the electrical conductivity of the adhesive, there are cases where the adhesiveness and the electrical conductivity cannot be compatible. In addition, the appearance may be poor.
- the aspect ratio of the conductive filler is not particularly limited, but is preferably 1.0 to 2.0, and more preferably 1.0 to 1.5. The aspect ratio can
- the content of the conductive filler in the acrylic pressure-sensitive adhesive layer is preferably 10 to 500 parts by weight, more preferably 20 to 400 parts by weight with respect to the total amount of monomer components (100 parts by weight) constituting the acrylic polymer. Part. If the content of the conductive filler exceeds 500 parts by weight, the conductive fillers may aggregate together or the adhesive surface becomes rough, which may cause a decrease in adhesiveness or a poor appearance. Moreover, there may be a disadvantage in cost. On the other hand, electrical conductivity may fall that it is less than 10 weight part.
- the pressure-sensitive adhesive composition for forming the acrylic pressure-sensitive adhesive layer in the conductive pressure-sensitive adhesive tape T 2 includes a cross-linking agent, a cross-linking accelerator, a tackifier resin (rosin derivative, polyterpene resin, petroleum resin, oil as necessary). Soluble phenols), anti-aging agents, fillers, colorants (pigments and dyes, etc.), UV absorbers, antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, etc. An additive can be used in the range which does not impair the characteristic of this invention.
- various common solvents can also be used.
- the kind of the solvent is not particularly limited, and examples thereof include those exemplified as the solvent used in the solution polymerization in the above-mentioned section [Conductive adhesive tape T 1 (first specific embodiment)].
- cross-linking agent examples include the cross-linking agents exemplified in the above-mentioned item [Conductive adhesive tape T 1 (first specific embodiment)]. Of these, isocyanate crosslinking agents and epoxy crosslinking agents are preferred, and isocyanate crosslinking agents are more preferred.
- the content of the crosslinking agent in the pressure-sensitive adhesive composition is not particularly limited, but is preferably 0 to 10 parts by weight, more preferably 0 to 0 parts by weight with respect to the total amount of monomer components (100 parts by weight) constituting the acrylic polymer. 5 parts by weight.
- the thickness of the acrylic pressure-sensitive adhesive layer is not particularly limited, but is preferably 5 to 120 ⁇ m, more preferably 10 to 90 ⁇ m. If the thickness exceeds 120 ⁇ m, it may be disadvantageous for thinning the product or it may be difficult to form the terminal portion. If the thickness is less than 5 ⁇ m, the acrylic pressure-sensitive adhesive layer is thin, so that the stress cannot be dispersed, and peeling may easily occur or the adhesiveness may be insufficient.
- the method for forming the acrylic pressure-sensitive adhesive layer can be a known and commonly used method for forming a pressure-sensitive adhesive layer, and differs depending on the polymerization method of the acrylic polymer and is not particularly limited.
- the following ( Examples of the method include 1) to (3).
- a composition comprising a mixture of monomer components (monomer mixture) constituting the acrylic polymer or a partial polymer thereof, a conductive filler and, if necessary, additives such as a photopolymerization initiator and a crosslinking agent, Alternatively, it is applied (coated) on the separator and irradiated with active energy rays (in particular, ultraviolet rays are preferred) to form an acrylic pressure-sensitive adhesive layer.
- active energy rays in particular, ultraviolet rays are preferred
- the coating (coating) in the method for forming the acrylic pressure-sensitive adhesive layer it is possible to use known coating methods, for example, the above Conductive adhesive tape T 1 (first specific embodiment )] Can be used.
- the base material is not particularly limited, in terms of electrical conductivity, the metal foil is preferable. Although it does not specifically limit as a material of metal foil, Copper, aluminum, nickel, silver, iron, and these alloys are mentioned. Among these, aluminum foil and copper foil are preferable from the viewpoints of cost, workability, and the like.
- the thickness of the substrate is preferably 10 to 100 ⁇ m, more preferably 15 to 75 ⁇ m, from the viewpoints of light weight, thin film formation, cost, step absorbability, and the like.
- the conductive pressure-sensitive adhesive tape T 2 has other layers (for example, an intermediate layer, an undercoat layer, etc.) as long as the effects of the present invention are not impaired in addition to the acrylic pressure-sensitive adhesive layer and the base material. Also good.
- the thickness of the conductive adhesive tape T 2 is not particularly limited, but is preferably 20 to 200 ⁇ m, more preferably 25 to 140 ⁇ m. If the thickness exceeds 200 ⁇ m, it may be disadvantageous for thinning the product, and if it is less than 20 ⁇ m, peeling may easily occur or adhesiveness may be insufficient.
- a separator may be provided on the pressure-sensitive adhesive layer surface (adhesive surface) of the conductive pressure-sensitive adhesive tape T 2 until use.
- the separator is used as a protective material for the acrylic pressure-sensitive adhesive layer, and is peeled off when being applied to an adherend. Note that the separator is not necessarily provided.
- illustrated separator such as in the section [conductive adhesive tape T 1 (the first specific embodiment) of the above.
- a separator can be formed by a well-known and usual method, and the thickness of a separator etc. are not specifically limited.
- Conductive adhesive tape T 2 are, it can be produced according to the production method of the conventionally known.
- the conductive pressure-sensitive adhesive tape T 2 does not have a base material, it can be produced by forming the acrylic pressure-sensitive adhesive layer on the separator.
- the acrylic pressure-sensitive adhesive layer may be directly formed on the surface of the base material (direct copying method)
- the acrylic pressure-sensitive adhesive layer may be provided on the base material by transferring (bonding) the base material to the base material (transfer method).
- the conductive adhesive tapes obtained in Examples 1 to 4 to be described later have the same configuration as the above “conductive adhesive tape T 1 ” (first specific embodiment).
- the conductive adhesive tapes obtained in Examples 5 to 8 have the same configuration as that of the “conductive adhesive tape T 2 ” (second specific embodiment).
- acrylic polymer solution A The weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer A”) in the acrylic polymer solution A was 520,000.
- Acrylic Polymer B In the same manner as in the above (Production Example of Acrylic Polymer A), except that the monomer mixture was changed to a monomer mixture in which 98 parts by weight of 2EHA and 2 parts by weight of AA were mixed, an acrylic polymer solution ( It may be referred to as “acrylic polymer solution B”).
- the weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer B”) in the acrylic polymer solution B was 600,000.
- Example of Production of Acrylic Polymer C The above monomer mixture was mixed with 46 parts by weight of 2EHA, 46 parts by weight of ethyl acrylate (EA), 4.5 parts by weight of methyl methacrylate (MMA), 3.5 parts by weight of 2-hydroxyethyl acrylate (HEA).
- An acrylic polymer solution (sometimes referred to as “acrylic polymer solution C”) was obtained in the same manner as in the above (Production Example of Acrylic Polymer A) except that the monomer mixture was mixed with parts by weight.
- the weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer C”) in the acrylic polymer solution C was 550,000.
- Acrylic Polymer D In the same manner as above (Production Example of Acrylic Polymer A) except that the monomer mixture was changed to a monomer mixture in which 80 parts by weight of 2EHA and 20 parts by weight of AA were mixed, an acrylic polymer solution ( It may be referred to as “acrylic polymer solution D”).
- the weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer D”) in the acrylic polymer solution D was 800,000.
- Acrylic Polymer E The above acrylic monomer solution was prepared in the same manner as in the above (Production Example of Acrylic Polymer A) except that the monomer mixture was changed to a monomer mixture in which 90 parts by weight of 2EHA and 10 parts by weight of AA were mixed. It may be referred to as “acrylic polymer solution E”.
- the weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer E”) in the acrylic polymer solution E was 750,000.
- Acrylic polymer solution F Acrylic polymer solution (Acrylic Polymer A Production Example) except that the monomer mixture was changed to a monomer mixture in which 95 parts by weight of BA and 5 parts by weight of AA were mixed. It may be referred to as “acrylic polymer solution F”.
- the weight average molecular weight of the acrylic polymer (may be referred to as “acrylic polymer F”) in the acrylic polymer solution F was 900,000.
- Example 1 Add 2 parts by weight of “Coronate L” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent) as a crosslinking agent to 100 parts by weight of acrylic polymer A in acrylic polymer solution A and mix. A pressure-sensitive adhesive composition solution was prepared.
- the compounding quantity (addition amount) of Coronate L it represents with the addition amount (part by weight) of solid content conversion, and it is the same also in the following description.
- the pressure-sensitive adhesive composition solution obtained above is dried on a 163 ⁇ m-thick release paper (separator) (manufactured by Oji Paper Co., Ltd., “110EPS (P) Blue”) so that the thickness after drying becomes 40 ⁇ m. And then dried by heating at 120 ° C. for 5 minutes under normal pressure to form an adhesive layer. Next, a 35 ⁇ m thick tough pitch copper foil was bonded to the surface of the pressure-sensitive adhesive layer, and aged at 40 ° C. for 1 day. Next, 110EPS (P) blue is peeled off to produce a laminate having the structure of “metal foil / adhesive layer”, the distances a and b in FIG.
- the punch outer diameter is 0.425 mm
- the die inner diameter is The laminate was molded using a drawing die having a thickness of 0.5 mm and a press to obtain a conductive pressure-sensitive adhesive tape having a conductive part and a terminal part having the shape shown in FIG. Furthermore, a polyolefin-based separator obtained by subjecting one surface of a polyethylene film (thickness: 80 ⁇ m) as a separator to a release treatment was bonded to the adhesive surface of the conductive adhesive tape.
- Example 2 A conductive pressure-sensitive adhesive tape in which a conductive path (conductive portion and terminal portion) was formed was obtained in the same manner as in Example 1 except that the acrylic polymer solution B was used as the acrylic polymer solution.
- Example 3 A conductive pressure-sensitive adhesive tape in which a conduction path was formed was obtained in the same manner as in Example 1 except that the acrylic polymer solution C was used as the acrylic polymer solution.
- Example 4 Into the acrylic polymer solution A, 100 parts by weight of acrylic polymer A is blended with 30 parts by weight of polymerized rosin pentaerythritol ester (Arakawa Chemical Co., Ltd., “Pencel D-125”) as a tackifier resin. Subsequently, 2 parts by weight of “Coronate L” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent) was added as a crosslinking agent and mixed to prepare a pressure-sensitive adhesive composition solution. Using the pressure-sensitive adhesive composition solution obtained above, a conductive pressure-sensitive adhesive tape in which a conduction path was formed was obtained in the same manner as in Example 1.
- “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent
- Example 5 In acrylic polymer solution A, 100 parts by weight of acrylic polymer A: 2 parts by weight of “Coronate L” (manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent) as a crosslinking agent, and “4SP as a conductive filler. -400 "(manufactured by NOVAMET, filler diameter d 50 : 12.0 ⁇ m, filler diameter d 85 : 26.2 ⁇ m, spherical) is mixed with 35 parts by weight and mixed with a stirrer for 10 minutes to obtain a pressure-sensitive adhesive composition solution (conductive Adhesive solution).
- “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd., isocyanate-based crosslinking agent
- 4SP as a conductive filler.
- -400 “(manufactured by NOVAMET, filler diameter d 50 : 12.0 ⁇ m, filler diameter d 85 : 26.2
- the pressure-sensitive adhesive composition solution obtained above is dried on a 163 ⁇ m-thick release paper (separator) (manufactured by Oji Paper Co., Ltd., “110EPS (P) Blue”) so that the thickness after drying becomes 20 ⁇ m. And then dried by heating at 120 ° C. for 5 minutes under normal pressure to form an adhesive layer. Next, an aluminum foil (aluminum foil) having a thickness of 40 ⁇ m was bonded to the surface of the pressure-sensitive adhesive layer, and aged at 40 ° C. for 1 day to conduct conductive adhesion. I got a tape.
- Example 6 A conductive adhesive tape was obtained in the same manner as in Example 5 except that the acrylic polymer solution B was used as the acrylic polymer solution.
- Example 7 A conductive adhesive tape was obtained in the same manner as in Example 5 except that the acrylic polymer solution C was used as the acrylic polymer solution.
- Example 8 Into the acrylic polymer solution A, 100 parts by weight of acrylic polymer A is blended with 30 parts by weight of polymerized rosin pentaerythritol ester (Arakawa Chemical Co., Ltd., “Pencel D-125”) as a tackifier resin.
- Pencel D-125 polymerized rosin pentaerythritol ester
- Comparative Example 1 A conductive adhesive tape having a conductive path was obtained in the same manner as in Example 1 except that the acrylic polymer solution D was used as the acrylic polymer solution.
- Comparative Example 2 A conductive adhesive tape having a conductive path was obtained in the same manner as in Example 1 except that the acrylic polymer solution E was used as the acrylic polymer solution.
- Comparative Example 3 A conductive adhesive tape having a conductive path was obtained in the same manner as in Example 1 except that the acrylic polymer solution F was used as the acrylic polymer solution.
- Comparative Example 4 A conductive adhesive tape was obtained in the same manner as in Example 5 except that the acrylic polymer solution D was used as the acrylic polymer solution.
- Comparative Example 5 A conductive adhesive tape was obtained in the same manner as in Example 5 except that the acrylic polymer solution E was used as the acrylic polymer solution.
- Comparative Example 6 A conductive adhesive tape was obtained in the same manner as in Example 5 except that the acrylic polymer solution F was used as the acrylic polymer solution.
- the 2 kg roller was reciprocated once to crimp the conductive adhesive tape piece 23, and this was used as a test sample (contact area between the copper foil 22 and the conductive adhesive tape piece 23: 100 mm 2 ).
- a DC power source 24, a DC ammeter 25, a DC voltmeter 26, and conductors 27a and 27b are connected.
- the circuit was connected and assembled, the resistance value (volume resistance) was measured, and this was defined as “volume resistance value”.
- the evaluation results are shown in the column of “volume resistance value” in Table 1.
- the resistance value ( ⁇ ) was calculated by dividing the voltage value (V) read by the DC voltmeter 26 by the current value (A) read by the DC ammeter 25.
- the conductive adhesive tape of the present invention had excellent corrosion resistance against metal (copper foil) and exhibited stable electrical conductivity.
- the corrosion resistance to the metal (copper foil) is poor, and the wet heat environment (60 ° C., 95% RH) ) Increased the resistance value, and the electrical conductivity was greatly reduced.
- the conductive pressure-sensitive adhesive tape of the present invention has excellent electrical conductivity and excellent corrosion resistance. Therefore, the conductive adhesive tape is used for electrically connecting two separated locations, and for electromagnetic shielding of electrical / electronic equipment and cables. Used for etc.
- the conductive adhesive tape of the present invention is excellent in long-term corrosion resistance, electronic devices that require stable electrical conductivity over a long period of time (for example, grounding of printed wiring boards, grounding of exterior shield cases of electronic devices, It is preferably used for grounding for static electricity prevention, internal wiring of power supply devices and electronic devices, etc.).
- Conductive adhesive tape T 1 111 Metal Foil 112 Acrylic Adhesive Layer 12 Conducting Portion 13 Terminal Portion 21 Glass Plate 22 Copper Foil 23 Conductive Adhesive Tape Strip 24 DC Power Supply 25 DC Ammeter 26 DC Voltmeter 27a, 27b Conductor 28a-d Knob Clip
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
まず、導電性粘着テープを適切な大きさに切り出し、セパレータが設けられている場合にはセパレータを剥離して、粘着面を露出させ試験片とする。両面粘着テープの場合には、一方の粘着面上にはPETフィルム(厚さ25~50μm)を貼付して、片方の粘着面のみを露出させた形態とする。なお、この際、アクリル系粘着剤層(本発明の導電性粘着テープが少なくとも有するアクリル系粘着剤層)側の表面を露出させる。試験片の大きさ(粘着面の露出面積)は100cm2が好ましい。
次いで、上記試験片を、温度100℃の純水中に入れ、45分間煮沸し、アクリル酸イオン及びメタクリル酸イオンの煮沸抽出を行う。
次いで、イオンクロマトグラフ法(イオンクロマトグラフィー)により、上記で得られた抽出液中のアクリル酸イオンおよびメタクリル酸イオンの合計量(単位:ng)を測定し、試験片の粘着面(露出した粘着面)の単位面積あたりのアクリル酸イオンおよびメタクリル酸イオンの合計量(単位:ng/cm2)を算出する。イオンクロマトグラフ法(イオンクロマトグラフィー)の測定条件は、特に限定されないが、例えば、下記の条件で測定することができる。
[イオンクロマトグラフ法の測定条件]
分析装置 : DIONEX社製、DX-320
分離カラム : Ion Pac AS15(4mm×250mm)
ガードカラム : Ion Pac AG15(4mm×50mm)
除去システム : ASRS-ULTRA(エクスターナルモード、100mA)
検出器 : 電気伝導度検出器
溶離液 : 7mM KOH(0~20分)
45mM KOH(20~30分)
(溶離液ジェネレーターEG40を使用)
溶離液流量 : 1.0ml/分
試料注入量 : 250μl
本発明の導電性粘着テープの第1の具体的態様(導電性粘着テープT1)は、金属箔の片面側にアクリル系粘着剤層を有し、前記金属箔に前記アクリル系粘着剤層を貫通し、かつその先端に端子部を有する導通部が形成された構成を有する片面粘着テープである。このような導通部の存在により、金属箔とアクリル系粘着剤層の被着体との貼着面との間で電気伝導性(厚み方向の電気伝導性)が確保される。図1及び図2は、導電性粘着テープT1を模式的に示す概略図である。図1(導電性粘着テープT1の平面図)において、11は導電性粘着テープT1を、12は導通部を示し、該導通部12は先端に端子部13を有する。導通部12(端子部13)の位置パターンは、いわゆる、散点パターンであり、例えば、図1に示すように、長手方向の配置間隔がaの列を間隔bで配列し、かつ互いに隣り合う列間において半ピッチずらし、例えば、aとbとをほぼ等しくしたものを使用できる。図2は、図1の導電性粘着テープT1のA-A断面図である。この例では、導電性粘着テープT111は、金属箔111の片面側にアクリル系粘着剤層112を有し、該金属箔111には、アクリル系粘着剤層112を貫通し、かつその先端に端子部13を有する導通部12が形成された構成を有している。
上記金属箔としては、自己支持性を有し、かつ電気伝導性を示す金属箔であればよく、例えば、銅、アルミニウム、ニッケル、銀、鉄、鉛やこれらの合金などの金属箔が使用される。上記の中でも、コストや加工性の観点から、アルミニウム箔、銅箔が好ましい。なお、上記金属箔は、スズめっき等の表面処理が施されているものであってもよい。上記金属箔の厚さは、特に限定されず、5~500μm程度の範囲から選択できるが、強度と可撓性とのバランスの観点から、8~200μmが好ましく、より好ましくは10~150μmである。
上記アクリル系粘着剤層は、アクリル系モノマーを必須の単量体(モノマー)成分として構成されるアクリル系ポリマーをベースポリマーとして含有する粘着剤層である。上記アクリル系粘着剤層(100重量%)中のアクリル系ポリマーの含有量は、特に限定されないが、60重量%以上(例えば、60~100重量%)であることが好ましく、より好ましくは65~99.999重量%である。
本発明の導電性粘着テープの第2の具体的態様(導電性粘着テープT2)は、電気伝導性を有するアクリル系粘着剤層を少なくとも一層有する導電性粘着テープである。導電性粘着テープT2は、両面粘着テープであってもよいし、片面粘着テープであってもよい。
上記アクリル系粘着剤層は、アクリル系モノマーを必須の単量体(モノマー)成分として構成されるアクリル系ポリマーをベースポリマーとして含有する粘着剤層であり、導電性フィラーを含有する。導電性フィラーを含有することにより、上記アクリル系粘着剤層中に導電パスが形成され、電気伝導性が付与される。上記アクリル系粘着剤層(100重量%)中のアクリル系ポリマーの含有量は、特に限定されないが、10重量%以上(例えば、10~95重量%)であることが好ましく、より好ましくは20~80重量%である。
導電性粘着テープT2が基材を有する場合、基材としては、特に限定されないが、電気伝導性の観点で、金属箔が好ましい。金属箔の材質としては、特に限定されないが、銅、アルミニウム、ニッケル、銀、鉄やこれらの合金が挙げられる。上記の中でも、コストや加工性などの観点から、アルミニウム箔、銅箔が好ましい。
アクリル酸2-エチルヘキシル(2EHA)70重量部、アクリル酸n-ブチル(BA)30重量部、アクリル酸(AA)3重量部が混合されたモノマー混合物を100重量部、重合開始剤として、2,2'-アゾビスイソブチロニトリル(AIBN)を0.2重量部、及び重合溶媒として酢酸エチル186重量部をセパラブルフラスコに投入し、窒素ガスを導入しながら1時間撹拌した。このようにして、重合系内の酸素を除去した後、63℃に昇温し、10時間反応させた後、トルエンを加えて濃度調整し、固形分濃度30重量%のアクリル系ポリマー溶液(「アクリル系ポリマー溶液A」と称する場合がある。)を得た。該アクリル系ポリマー溶液Aにおけるアクリル系ポリマー(「アクリル系ポリマーA」と称する場合がある)の重量平均分子量は52万であった。
上記モノマー混合物を、2EHA98重量部、AA2重量部が混合されたモノマー混合物に変更した以外は上記(アクリル系ポリマーAの製造例)と同様にして、アクリル系ポリマー溶液(「アクリル系ポリマー溶液B」と称する場合がある)を得た。該アクリル系ポリマー溶液Bにおけるアクリル系ポリマー(「アクリル系ポリマーB」と称する場合がある)の重量平均分子量は60万であった。
上記モノマー混合物を、2EHA46重量部、アクリル酸エチル(EA)46重量部、メタクリル酸メチル(MMA)4.5重量部、アクリル酸2-ヒドロキシエチル(HEA)3.5重量部が混合されたモノマー混合物に変更した以外は上記(アクリル系ポリマーAの製造例)と同様にして、アクリル系ポリマー溶液(「アクリル系ポリマー溶液C」と称する場合がある)を得た。該アクリル系ポリマー溶液Cにおけるアクリル系ポリマー(「アクリル系ポリマーC」と称する場合がある)の重量平均分子量は55万であった。
上記モノマー混合物を、2EHA80重量部、AA20重量部が混合されたモノマー混合物に変更した以外は上記(アクリル系ポリマーAの製造例)と同様にして、アクリル系ポリマー溶液(「アクリル系ポリマー溶液D」と称する場合がある)を得た。該アクリル系ポリマー溶液Dにおけるアクリル系ポリマー(「アクリル系ポリマーD」と称する場合がある)の重量平均分子量は80万であった。
上記モノマー混合物を、2EHA90重量部、AA10重量部が混合されたモノマー混合物に変更した以外は上記(アクリル系ポリマーAの製造例)と同様にして、アクリル系ポリマー溶液(「アクリル系ポリマー溶液E」と称する場合がある)を得た。該アクリル系ポリマー溶液Eにおけるアクリル系ポリマー(「アクリル系ポリマーE」と称する場合がある)の重量平均分子量は75万であった。
上記モノマー混合物を、BA95重量部、AA5重量部が混合されたモノマー混合物に変更した以外は上記(アクリル系ポリマーAの製造例)と同様にして、アクリル系ポリマー溶液(「アクリル系ポリマー溶液F」と称する場合がある)を得た。該アクリル系ポリマー溶液Fにおけるアクリル系ポリマー(「アクリル系ポリマーF」と称する場合がある)の重量平均分子量は90万であった。
アクリル系ポリマー溶液Aに、アクリル系ポリマーA:100重量部に対して、架橋剤として「コロネートL」(日本ポリウレタン工業(株)製、イソシアネート系架橋剤)2重量部を添加し、混合することによって粘着剤組成物溶液を調製した。なお、コロネートLの配合量(添加量)については、固形分換算の添加量(重量部)で表しており、以下の記載においても同様である。
上記で得られた粘着剤組成物溶液を、厚さ163μmの剥離紙(セパレータ)(王子製紙(株)製、「110EPS(P)ブルー」)上に、乾燥後の厚さが40μmとなるように流延塗布し、常圧下、120℃で5分間加熱乾燥して粘着剤層を形成した。次いで、粘着剤層表面に厚さ35μmのタフピッチ銅箔を貼り合わせ、40℃で1日間エージングした。
次いで、110EPS(P)ブルーを剥離し、「金属箔/粘着剤層」の構成を有する積層体を作製し、図1における間隔a、bが5mmで、ポンチ外径が0.425mm、ダイス内径が0.5mmである絞り金型とプレスを用いて、前記積層体を成形し、図2に示す形状の導通部および端子部が形成された導電性粘着テープを得た。
さらに、該導電性粘着テープの粘着面に、セパレータとしてポリエチレンフィルム(厚さ80μm)の片面に離型処理を施した、ポリオレフィン系セパレータを貼り合わせた。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Bを用いた以外は実施例1と同様にして、導通経路(導通部および端子部)が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Cを用いた以外は実施例1と同様にして、導通経路が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液Aに、アクリル系ポリマーA:100重量部に対して、粘着付与樹脂として重合ロジンペンタエリスリトールエステル(荒川化学(株)製、「ペンセル D-125」)30重量部を配合し、次いで、架橋剤として「コロネートL」(日本ポリウレタン工業(株)製、イソシアネート系架橋剤)2重量部を添加し、混合することによって粘着剤組成物溶液を調製した。
上記で得られた粘着剤組成物溶液を用いて実施例1と同様にして、導通経路が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液Aに、アクリル系ポリマーA:100重量部に対して、架橋剤として「コロネートL」(日本ポリウレタン工業(株)製、イソシアネート系架橋剤)2重量部、導電性フィラーとして「4SP-400」(NOVAMET社製、フィラー径d50:12.0μm、フィラー径d85:26.2μm、球状)35重量部を配合し、攪拌機で10分間混合して、粘着剤組成物溶液(導電性粘着剤溶液)を得た。
上記で得られた粘着剤組成物溶液を、厚さ163μmの剥離紙(セパレータ)(王子製紙(株)製、「110EPS(P)ブルー」)上に、乾燥後の厚さが20μmとなるように流延塗布し、常圧下、120℃で5分間加熱乾燥して粘着剤層を形成した。次いで、粘着剤層表面に厚さ40μmのアルミニウム箔(アルミ箔)(住軽アルミ箔(株)製、商品名「べスパ」)を貼り合わせ、40℃で1日間エージングして、導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Bを用いた以外は実施例5と同様にして、導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Cを用いた以外は実施例5と同様にして、導電性粘着テープを得た。
アクリル系ポリマー溶液Aに、アクリル系ポリマーA:100重量部に対して、粘着付与樹脂として重合ロジンペンタエリスリトールエステル(荒川化学(株)製、「ペンセル D-125」)30重量部を配合し、次いで、架橋剤として「コロネートL」(日本ポリウレタン工業(株)製、イソシアネート系架橋剤)2重量部、導電性フィラーとして「4SP-400」(NOVAMET社製、フィラー径d50:12.0μm、フィラー径d85:26.2μm、球状)35重量部を配合し、攪拌機で10分間混合して、粘着剤組成物溶液(導電性粘着剤溶液)を得た。
上記で得られた粘着剤組成物溶液を用いて実施例5と同様にして、導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Dを用いた以外は実施例1と同様にして、導通経路が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Eを用いた以外は実施例1と同様にして、導通経路が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Fを用いた以外は実施例1と同様にして、導通経路が形成された導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Dを用いた以外は実施例5と同様にして、導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Eを用いた以外は実施例5と同様にして、導電性粘着テープを得た。
アクリル系ポリマー溶液として、アクリル系ポリマー溶液Fを用いた以外は実施例5と同様にして、導電性粘着テープを得た。
実施例及び比較例で得られた導電性粘着テープについて、以下の評価を行った。結果は表1に示した。
(試験片の作製)
実施例及び比較例で得られた導電性粘着テープから、サイズ:幅10cm×長さ10cmのテープ片を切り出した。その後、このテープ片からセパレータを剥離し、粘着面を露出させた試験片を作製した(粘着面の露出面積:100cm2)。
((メタ)アクリル酸イオンの煮沸抽出)
次いで、上記試験片を、温度100℃の純水(50ml)中に入れ、45分間煮沸し、煮沸抽出を行い、抽出液を得た。
次いで、イオンクロマトグラフ法(イオンクロマトグラフィー)により、上記で得られた抽出液中のアクリル酸イオン及びメタクリル酸イオンの合計量(単位:ng)を測定し、試験片の粘着面(露出した粘着面)の単位面積あたりのアクリル酸イオン及びメタクリル酸イオンの合計量(単位:ng/cm2)を算出した。なお、測定結果は、表1の「抽出(メタ)アクリル酸イオン量」の欄に示した。
[イオンクロマトグラフ法の測定条件]
分析装置 : DIONEX社製、DX-320
分離カラム : Ion Pac AS15(4mm×250mm)
ガードカラム : Ion Pac AG15(4mm×50mm)
除去システム : ASRS-ULTRA(エクスターナルモード、100mA)
検出器 : 電気伝導度検出器
溶離液 : 7mM KOH(0~20分)
45mM KOH(20~30分)
(溶離液ジェネレーターEG40を使用)
溶離液流量 : 1.0ml/分
試料注入量 : 250μl
実施例及び比較例で得られた導電性粘着テープ(片面粘着テープ)から、サイズ:幅10mm×長さ100mmのテープ片を切り出し、セパレータを剥離して、粘着面を露出させた導電性粘着テープ片23を得た。
次いで、図3に示すように、ガラス板21(ソーダライムガラス、サイズ:幅80mm×長さ80mm、厚さ3.2mm)上に銅箔22(サイズ:幅10mm×長さ100mm、厚さ35μm)を固定し、上記で得た導電性粘着テープ片23を銅箔22及びガラス板21上に貼付した。次いで、2kgローラーを1往復させて導電性粘着テープ片23を圧着し、これを試験サンプルとした(銅箔22と導電性粘着テープ片23との接触面積:100mm2)。
上記試験サンプルを室温(23℃、50%RHの雰囲気下)で、少なくとも12時間放置した後、図3に示すように、直流電源24、直流電流計25、直流電圧計26及び導線27a、27bを接続して回路を組み、抵抗値(体積抵抗)を測定して、これを「体積抵抗値」とした。評価結果は、表1の「体積抵抗値」の欄に示した。なお、抵抗値(Ω)は、直流電圧計26で読み取った電圧値(V)を、直流電流計25で読み取った電流値(A)により除することによって算出した。
実施例及び比較例で得られた導電性粘着テープから、サイズ:幅1cm×長さ15cmのテープ片を切り出した。その後、このテープ片からセパレータを剥離し、粘着面を銅箔(サイズ:幅40cm×長さ50cm、厚さ35μm)に貼り付けて、試験サンプルを作製した。
上記試験サンプルを60℃、95%RHの雰囲気下に250時間保持した後、23℃、50%RHの雰囲気下に取り出し、次いで、銅箔から導電性粘着テープを剥離し、該試験サンプルの導電性粘着テープが貼り合わされていた箇所の銅箔表面を目視で観察した。表面が変色していた場合を銅箔が腐食されているものとして耐腐食性「不良」、表面が変色していない場合を銅箔が腐食されていないものとして耐腐食性「良好」と判定した。なお、評価結果は、表1の「耐腐食性(銅箔の変色)」の欄に示した。
上記「(2)体積抵抗値」にて測定した体積抵抗値を「初期抵抗値」とした。続いて、初期抵抗値を測定した後の試験サンプルを60℃、95%RHの雰囲気下に250時間保持し、室温(23℃、50%RH)の雰囲気下に戻した後、上記「(2)体積抵抗値」と同様に体積抵抗値を測定し、これを「湿熱後の抵抗値」とした。
湿熱環境に暴露することによる抵抗値変化(「湿熱後の抵抗値」から「初期抵抗値」を引いた値)の、「初期抵抗値」に対する割合を、[(湿熱後の抵抗値-初期抵抗値)/初期抵抗値 × 100]により算出し、これを「抵抗値変化率」とした。上記で算出された抵抗値変化率が100%以下であれば耐腐食性「良好」、100%を超えた場合は耐腐食性「不良」と判定した。なお、評価結果は、表1の「耐腐食性(抵抗値)」の欄に示した。
111 金属箔
112 アクリル系粘着剤層
12 導通部
13 端子部
21 ガラス板
22 銅箔
23 導電性粘着テープ片
24 直流電源
25 直流電流計
26 直流電圧計
27a、27b 導線
28a~d つまみクリップ
Claims (4)
- アクリル系粘着剤層を少なくとも一層有する粘着テープであって、体積抵抗値が1×101Ω以下であり、イオンクロマトグラフ法で測定される、該粘着テープより純水で100℃、45分の条件で抽出されたアクリル酸イオンおよびメタクリル酸イオンの合計量が、前記アクリル系粘着剤層の単位面積あたり20ng/cm2以下であることを特徴とする導電性粘着テープ。
- 前記導電性粘着テープが、金属箔の片面側に前記アクリル系粘着剤層を有し、前記金属箔に前記アクリル系粘着剤層を貫通し、かつその先端に端子部を有する導通部が形成された請求項1に記載の導電性粘着テープ。
- 前記アクリル系粘着剤層が、アクリル系ポリマーを構成するモノマー成分全量(100重量部)に対して、導電性フィラーを10~500重量部含有するアクリル系粘着剤層である請求項1に記載の導電性粘着テープ。
- 金属箔の少なくとも片面側に前記アクリル系粘着剤層を有する請求項3に記載の導電性粘着テープ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/574,581 US20120308815A1 (en) | 2010-01-26 | 2011-01-21 | Electroconductive pressure-sensitive adhesive tape |
CN201180007217.XA CN102725369B (zh) | 2010-01-26 | 2011-01-21 | 导电性粘合带 |
EP11736927.2A EP2530130A4 (en) | 2010-01-26 | 2011-01-21 | CONDUCTIVE TAPE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010014728A JP2011153190A (ja) | 2010-01-26 | 2010-01-26 | 導電性粘着テープ |
JP2010-014728 | 2010-01-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011093214A1 true WO2011093214A1 (ja) | 2011-08-04 |
Family
ID=44319202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/051052 WO2011093214A1 (ja) | 2010-01-26 | 2011-01-21 | 導電性粘着テープ |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120308815A1 (ja) |
EP (1) | EP2530130A4 (ja) |
JP (1) | JP2011153190A (ja) |
CN (1) | CN102725369B (ja) |
WO (1) | WO2011093214A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013148967A1 (en) * | 2012-03-30 | 2013-10-03 | Adhesives Research, Inc. | Charge collection tape |
CN103764780A (zh) * | 2011-08-30 | 2014-04-30 | 日东电工株式会社 | 导电性粘合带 |
CN104428381A (zh) * | 2012-07-05 | 2015-03-18 | 琳得科株式会社 | 粘合片 |
WO2019187787A1 (ja) * | 2018-03-27 | 2019-10-03 | 綜研化学株式会社 | 粘着テープ |
TWI677555B (zh) * | 2014-08-28 | 2019-11-21 | 日商琳得科股份有限公司 | 導電性黏著薄片 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013049764A (ja) * | 2011-08-30 | 2013-03-14 | Nitto Denko Corp | 導電性粘着テープ |
JP2013049763A (ja) * | 2011-08-30 | 2013-03-14 | Nitto Denko Corp | 導電性粘着テープ |
JP5942725B2 (ja) * | 2012-09-18 | 2016-06-29 | デクセリアルズ株式会社 | 導電性シート |
JP6098180B2 (ja) * | 2013-01-18 | 2017-03-22 | Dic株式会社 | 導電性粘着シート |
JP2014145067A (ja) * | 2013-01-30 | 2014-08-14 | Lintec Corp | 電子部品貼付用アースラベル |
US9087777B2 (en) * | 2013-03-14 | 2015-07-21 | United Test And Assembly Center Ltd. | Semiconductor packages and methods of packaging semiconductor devices |
WO2015076174A1 (ja) * | 2013-11-20 | 2015-05-28 | Dic株式会社 | 導電性粘着シート及び電子機器 |
KR102270480B1 (ko) * | 2014-02-28 | 2021-06-29 | 닛토덴코 가부시키가이샤 | 도전성 점착 테이프 및 도전성 점착 테이프가 부착된 표시 장치 |
CN109415608B (zh) * | 2016-06-17 | 2021-11-23 | 株式会社寺冈制作所 | 导电性粘着剂组合物及导电性粘着带 |
KR101955873B1 (ko) * | 2017-06-30 | 2019-05-27 | 이주엽 | 전기 전도성 및 내화학성이 우수한 접착제 |
KR102590012B1 (ko) * | 2017-11-30 | 2023-10-16 | 엘지디스플레이 주식회사 | 접착제 및 이를 적용한 플렉서블 디스플레이 |
JP6506461B1 (ja) * | 2018-02-01 | 2019-04-24 | 積水化学工業株式会社 | 導電性粘着テープ |
CN114746493A (zh) * | 2020-02-19 | 2022-07-12 | 日本瑞翁株式会社 | 自吸附性发泡片用组合物和自吸附性发泡层叠片 |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6346980Y2 (ja) | 1982-02-24 | 1988-12-05 | ||
JPH08185714A (ja) | 1994-12-29 | 1996-07-16 | Nitto Denko Corp | 導電性接着テ−プ |
JPH10292155A (ja) | 1997-04-17 | 1998-11-04 | Nitto Denko Corp | 導電性接着テ−プ及びその製造方法 |
JPH11302615A (ja) | 1998-04-24 | 1999-11-02 | Nitto Denko Corp | 導電性接着テープ |
JP2001210145A (ja) * | 2000-01-31 | 2001-08-03 | Toyo Ink Mfg Co Ltd | 導電性粘着シートおよびその製造方法 |
JP2004263030A (ja) | 2003-02-28 | 2004-09-24 | Dainippon Ink & Chem Inc | 導電性粘着シート |
JP2005277145A (ja) | 2004-03-25 | 2005-10-06 | Dainippon Ink & Chem Inc | 電磁波シールド用粘着シート |
JP2007246882A (ja) * | 2006-02-14 | 2007-09-27 | Nippon Synthetic Chem Ind Co Ltd:The | 樹脂組成物およびそれを用いた粘着剤組成物ならびに粘着シート |
JP2008222967A (ja) * | 2007-03-15 | 2008-09-25 | Lintec Corp | 粘着シート |
JP2009091485A (ja) * | 2007-10-10 | 2009-04-30 | Nitto Denko Corp | 配線回路基板用両面粘着テープ又はシートおよび配線回路基板 |
JP2010195942A (ja) * | 2009-02-25 | 2010-09-09 | Nitto Denko Corp | 粘着シートおよび粘着型機能性フィルム |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3762946A (en) * | 1971-10-21 | 1973-10-02 | Minnesota Mining & Mfg | Small particle loaded electrically conductive adhesive tape |
US4396675A (en) * | 1982-09-22 | 1983-08-02 | Minnesota Mining And Manufacturing Company | Storable, crosslinkable pressure-sensitive adhesive tape |
DE10259549A1 (de) * | 2002-12-19 | 2004-07-08 | Tesa Ag | Haftklebeartikel mit wenigstens einer Schicht aus einer elektrisch leitfähigen Haftklebemasse und Verfahren zu seiner Herstellung |
JP3849680B2 (ja) * | 2003-10-06 | 2006-11-22 | セイコーエプソン株式会社 | 基板接合体の製造方法、基板接合体、電気光学装置の製造方法、及び電気光学装置 |
JP5221027B2 (ja) * | 2006-02-17 | 2013-06-26 | リンテック株式会社 | 電磁波遮蔽フィルムと光学機能性フィルムとの貼合用粘着剤、及び前記粘着剤を含むディスプレイパネルフィルター要素 |
JP4933296B2 (ja) * | 2007-02-15 | 2012-05-16 | ダイヤテックス株式会社 | 導電性接着剤組成物、導電性接着シート及び導電性接着テープ |
JP5248460B2 (ja) * | 2009-10-22 | 2013-07-31 | 日東電工株式会社 | 導電性粘着テープ |
-
2010
- 2010-01-26 JP JP2010014728A patent/JP2011153190A/ja active Pending
-
2011
- 2011-01-21 WO PCT/JP2011/051052 patent/WO2011093214A1/ja active Application Filing
- 2011-01-21 US US13/574,581 patent/US20120308815A1/en not_active Abandoned
- 2011-01-21 EP EP11736927.2A patent/EP2530130A4/en not_active Withdrawn
- 2011-01-21 CN CN201180007217.XA patent/CN102725369B/zh not_active Expired - Fee Related
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6346980Y2 (ja) | 1982-02-24 | 1988-12-05 | ||
JPH08185714A (ja) | 1994-12-29 | 1996-07-16 | Nitto Denko Corp | 導電性接着テ−プ |
JPH10292155A (ja) | 1997-04-17 | 1998-11-04 | Nitto Denko Corp | 導電性接着テ−プ及びその製造方法 |
JPH11302615A (ja) | 1998-04-24 | 1999-11-02 | Nitto Denko Corp | 導電性接着テープ |
JP2001210145A (ja) * | 2000-01-31 | 2001-08-03 | Toyo Ink Mfg Co Ltd | 導電性粘着シートおよびその製造方法 |
JP2004263030A (ja) | 2003-02-28 | 2004-09-24 | Dainippon Ink & Chem Inc | 導電性粘着シート |
JP2005277145A (ja) | 2004-03-25 | 2005-10-06 | Dainippon Ink & Chem Inc | 電磁波シールド用粘着シート |
JP2007246882A (ja) * | 2006-02-14 | 2007-09-27 | Nippon Synthetic Chem Ind Co Ltd:The | 樹脂組成物およびそれを用いた粘着剤組成物ならびに粘着シート |
JP2008222967A (ja) * | 2007-03-15 | 2008-09-25 | Lintec Corp | 粘着シート |
JP2009091485A (ja) * | 2007-10-10 | 2009-04-30 | Nitto Denko Corp | 配線回路基板用両面粘着テープ又はシートおよび配線回路基板 |
JP2010195942A (ja) * | 2009-02-25 | 2010-09-09 | Nitto Denko Corp | 粘着シートおよび粘着型機能性フィルム |
Non-Patent Citations (1)
Title |
---|
See also references of EP2530130A4 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103764780A (zh) * | 2011-08-30 | 2014-04-30 | 日东电工株式会社 | 导电性粘合带 |
WO2013148967A1 (en) * | 2012-03-30 | 2013-10-03 | Adhesives Research, Inc. | Charge collection tape |
US9238760B2 (en) | 2012-03-30 | 2016-01-19 | Adhesives Research, Inc. | Charge collection side adhesive tape |
CN104428381A (zh) * | 2012-07-05 | 2015-03-18 | 琳得科株式会社 | 粘合片 |
TWI677555B (zh) * | 2014-08-28 | 2019-11-21 | 日商琳得科股份有限公司 | 導電性黏著薄片 |
WO2019187787A1 (ja) * | 2018-03-27 | 2019-10-03 | 綜研化学株式会社 | 粘着テープ |
JPWO2019187787A1 (ja) * | 2018-03-27 | 2021-02-25 | 綜研化学株式会社 | 粘着テープ |
Also Published As
Publication number | Publication date |
---|---|
CN102725369A (zh) | 2012-10-10 |
US20120308815A1 (en) | 2012-12-06 |
EP2530130A1 (en) | 2012-12-05 |
EP2530130A4 (en) | 2015-08-19 |
JP2011153190A (ja) | 2011-08-11 |
CN102725369B (zh) | 2014-12-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2011093214A1 (ja) | 導電性粘着テープ | |
JP6106148B2 (ja) | 導電性粘着テープ、電子部材及び粘着剤 | |
JP6974170B2 (ja) | 電気剥離用粘着剤組成物、粘着シート、及び接合体 | |
JP5243990B2 (ja) | 両面粘着シート | |
JP6516473B2 (ja) | 導電性粘着テープ、および導電性粘着テープ付表示装置 | |
JP5443917B2 (ja) | 絶縁テープ | |
JP2014234444A (ja) | 導電性両面粘着テープ | |
CN104877589A (zh) | 导电性粘合带以及带导电性粘合带的显示装置 | |
JP5248460B2 (ja) | 導電性粘着テープ | |
CN108300371B (zh) | 导电性压敏粘合带 | |
US20120325518A1 (en) | Conductive thermosetting adhesive tape | |
JP5520785B2 (ja) | 絶縁テープ | |
WO2013031499A1 (ja) | 導電性粘着テープ | |
JP2013049764A (ja) | 導電性粘着テープ | |
JP2015010109A (ja) | 導電性粘着テープ | |
US20130004767A1 (en) | Electroconductive pressure-sensitive adhesive tape | |
JP2017066407A (ja) | 導電性粘着テープ、電子部材及び粘着剤 | |
CN109135601B (zh) | 导电性粘着片 | |
JP2015010110A (ja) | 導電性粘着テープ | |
JP2015010111A (ja) | 導電性粘着テープ | |
WO2022172566A1 (ja) | 光学部材用粘着テープ | |
KR20240068664A (ko) | 점착제 조성물, 점착 시트, 및 접합체 | |
JP5314999B2 (ja) | 導電性粘着剤の製造方法、導電性粘着シートの製造方法、剥離シート付き導電性粘着シートの製造方法 | |
JP2013049763A (ja) | 導電性粘着テープ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180007217.X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11736927 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13574581 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2011736927 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011736927 Country of ref document: EP |