Anisotropically electricity conductive film comprising thermosetting adhesive agent and electrically conductive particles

• US 5,932,339 A
• Filed: 08/22/1996
• Issued: 08/03/1999
• Est. Priority Date: 08/22/1995
• Status: Expired due to Term

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Saito, Tasuku, Kotsubo, Hidefumi, Sakurai, Ryou
• Primary Examiner(s): Le, Hoa T.
• Application Number:
  US08/701,690
• Time in Patent Office: 1,076 Days
• Field of Search: 428/323, 428/332, 428/523, 174/126.2, 174/257, 174/259
• US Class Current: 428/323
• CPC Class Codes: H01L 23/4922 having a heterogeneous or anisotropic structure
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 2201/0239 Coupling agent for particles using a coupling agent to improve the adhesion between an insulating substrate and a metal H05K3/389
• CPC Class Codes: H05K 3/323 by applying an anisotropic conductive adhesive layer over an array of pads
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

The present invention relates to an anisotropically electricity-conductive film obtainable by dispersing in an adhesive agent electrically conductive particles, the adhesive agent being a curable adhesive agent comprising as a major component at least one polymer selected from the group consisting of an ethylene-vinyl acetate copolymer; a copolymer of ethylene, vinyl acetate and an acrylate and/or methacrylate monomer; a copolymer of ethylene, vinyl acetate and maleic acid and/or maleic anhydride; a copolymer of ethylene, an acrylate and/or methacrylate monomer and maleic acid and/or maleic anhydride; and an ionomer resin wherein molecules of an ethylene-methacrylic acid copolymer are linked with each other through a metal ion.

Claims

1. An anisotropically electricity-conductive film comprising electrically conductive particles dispersed in an adhesive agent, said adhesive agent comprising a thermosetting adhesive agent including as a major component at least one polymer selected from the group consisting of an ethylene-vinyl acetate copolymer;

a copolymer of ethylene, vinyl acetate and an acrylate and/or methacrylate monomer;

a copolymer of ethylene, vinyl acetate and maleic acid and/or maleic anhydride;

a copolymer of ethylene, one or both of an acrylate monomer and a methacrylate monomer, and one or both of maleic acid and maleic anhydride; and

an ionomer resin wherein molecules of an ethylene-methacrylic acid copolymer are linked with each other through a metal ion;

wherein said electrically conductive particles are contained in a ratio of from 0.1 to 15% by volume in relation to said polymer, and said electrically conductive particles have a particle size of from 0.1 to 100 μ

m, and further comprising 0.1-10 weight parts of an organic peroxide;

0.01-5 weight parts of a silane coupling agent; and

0.1-20 weight parts of an epoxy group containing compound in relation to 100 weight parts of said at least one polymer.

2. The anisotropically electricity-conductive film of claim 1, further comprising 0.1-50 weight parts of at least one compound selected from the group consisting of an acryloyl group containing compound, a methacryloyl group containing compound and an allyl group containing compound in relation to 100 weight parts of said polymer.

3. The anisotropically electricity-conductive film of claim 1, further comprising 1-200 weight parts of a hydrocarbon resin in relation to 100 weight parts of said polymer.

4. The anisotropically electricity-conductive film of claim 1, wherein said polymer is an ethylene-vinyl acetate copolymer of which the vinyl acetate content is 10-50% by weight.

5. The anisotropically electricity-conductive film of claim 1, wherein said polymer is a copolymer of ethylene, vinyl acetate and an acrylate and/or methacrylate monomer of which the vinyl acetate content is 10-50% by weight and the acrylate and/or methacrylate monomer content is 0.01-10% by weight.

6. The anisotropically electricity-conductive film of claim 1, wherein said polymer is a copolymer of ethylene, vinyl acetate and maleic acid and/or maleic anhydride of which the vinyl acetate content is 10-50% by weight and the maleic acid/or maleic anhydride content is 0.01-10% by weight.

7. The anisotropically electricity-conductive film of claim 1, wherein said polymer is a copolymer of ethylene, an acrylate and/or methacrylate monomer and maleic acid and/or maleic anhydride of which the acrylate monomer content is 10-50% by weight and the maleic acid/or maleic anhydride content is 0.01-10% by weight.

8. The anisotropically electricity-conductive film of claim 1, wherein said polymer is said ionomer resin of which the methacrylic acid content is 1-30% by weight and the degree of ionization by a metal ion is 5-80%.

9. An anisotropically electricity-conductive film comprising electrically conductive particles dispersed in an adhesive agent, said adhesive agent comprising a photo-setting adhesive agent including as a major component at least one polymer selected from the group consisting of an ethylene-vinyl acetate copolymer;

a copolymer of ethylene, vinyl acetate and an acrylate and/or methacrylate monomer;

a copolymer of ethylene, vinyl acetate and maleic acid and/or maleic anhydride;

a copolymer of ethylene, one or both of an acrylate monomer and a methacrylate monomer, and one or both of maleic acid and maleic anhydride; and

an ionomer resin wherein molecules of an ethylene-methacrylic acid copolymer are linked with each other through a metal ion;

wherein said electrically conductive particles are contained in a ratio of from 0.1 to 15% by volume in relation to said polymer, and said electrically conductive particles have a particle size of from 0.1 to 100 μ

m, and further comprising 0.1-10 weight parts of a photosensitizer;

0.01-5 weight parts of a silane coupling agent; and

0.1-20 weight parts of an epoxy group containing compound in relation to 100 weight parts of said at least one polymer.

10. The anisotropically electricity-conductive film of claim 9, further comprising 0.1-50 weight parts of at least one compound selected from the group consisting of an acryloyl group containing compound, a methacryloyl group containing compound and an allyl group containing compound in relation to 100 weight parts of said polymer.

11. The anisotropically electricity-conductive film of claim 9, further comprising 1-200 weight parts of a hydrocarbon resin in relation to 100 weight parts of said polymer.

12. The anisotropically electricity-conductive film of claim 9, wherein said polymer is an ethylene-vinyl acetate copolymer of which the vinyl acetate content is 10-50% by weight.

13. The anisotropically electricity-conductive film of claim 9, wherein said polymer is a copolymer of ethylene, vinyl acetate and an acrylate and/or methacrylate monomer of which the vinyl acetate content is 10-50% by weight and the acrylate and/or methacrylate monomer content is 0.01-10% by weight.

14. The anisotropically electricity-conductive film of claim 9, wherein said polymer is a copolymer of ethylene, vinyl acetate and maleic acid and/or maleic anhydride of which the vinyl acetate content is 10-50% by weight and the maleic acid/or maleic anhydride content is 0.01-10% by weight.

15. The anisotropically electricity-conductive film of claim 9, wherein said polymer is a copolymer of ethylene, one or both of an acrylate monomer and a methacrylate monomer, and one or both of maleic acid and maleic anhydride and the acrylate monomer content is 10-50% by weight and the content of one or both of maleic acid and maleic anhydride is 0.01-10% by weight.

16. The anisotropically electricity-conductive film of claim 9, wherein said polymer is said ionomer resin of which the methacrylic acid content is 1-30% by weight and the degree of ionization by a metal ion is 5-80%.