US4701279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anisotropically electroconductive adhesives
Assignee: Shin-Etsu Polymer Co Ltd
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Filing: 1986-08-15
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Granted: 1987-10-20
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Expires: 2006-08-15
Abstract
Abstract An anisotropically electroconductive adhesive which is solid at room temperature, preferably, in the form of a film is prepared by dispersing conductive particles such as metal particles and the like in a thermoplastic insulating adhesive composition comprising an unvulcanized thermoplastic elastomer such as a styrene-based elastomer and a crosslinked synthetic rubber and/or thermoplastic elastomer as a vulcanizate derived from an unvulcanized synthetic rubber or thermoplastic elastomer using a vulcanizing agent such as organic peroxides. The conductive adhesive is useful in adhesively bonding, for example, two electronic circuit boards without disadvantages of instability of the electric resistance, inconvenience in the application and so on.
Inventors
- 👤 Toshiyuki Kawaguchi
- 👤 Hideki Suzuki
- 👤 Tsuneo Usuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:28
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/323; C; C09; C09J; C09J153/00; C09J153/02; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/24; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0129; H05K2201/0133; H05K3/36; H05K3/361
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
An anisotropically electroconductive composition which comprises: (a) an electrically insulating homogeneous polymeric adhesive composition as the matrix which is a mixture comprising (a-1) an uncrosslinked thermoplastic elastomer, and (a-2) a crosslinked thermoplastic elastomer or a crosslinked synthetic rubber selected from the group consisting of butadiene rubbers, isoprene rubbers, chloroprene rubbers, silicone rubbers, and EPDM rubbers, in an amount of at least 25% by weight based on the amount of component (a-1), said thermoplastic elastomer being selected from the group consisting of styrene based elastomer products of the polyaddition reaction between a diol and an aromatic diisocyanate, block-wise copolymers of polyesters, block-wise copolymers of polyethers, butyl-grafter polyethylenes, mixtures or reaction products of an EPDM and polypropylene, and copolymers of dimethylpolysiloxane and styrene; and (b) electroconductive particles in an electroconductive effective amount uniformly dispersed in the electrically insulating polymeric adhesive composition as the component (a).
Claim 2
Dependent Claim
143 words
An anisotropically electroconductive composition which comprises: (a) an electrically insulating homogeneous polymeric adhesive composition as the matrix which is a mixture comprising (a-1) an uncrosslinked thermoplastic elastomer, and (a-2) a crosslinked thermoplastic elastomer or a crosslinked synthetic rubber selected from the group consisting of butadiene rubbers, isoprene rubbers, chloroprene rubbers, silicone rubbers, and EPDM rubbers, in an amount of at least 25% by weight based on the amount of component (a-1), said thermoplastic elastomer being selected from the group consisting of styrene based elastomer products of the polyaddition reaction between a diol and an aromatic diisocyanate, block-wise copolymers of polyesters, block-wise copolymers of polyethers, butyl-grafter polyethylenes, mixtures or reaction products of an EPDM and polypropylene, and copolymers of dimethylpolysiloxane and styrene; and (b) electroconductive particles in an electroconductive effective amount uniformly dispersed in the electrically insulating polymeric adhesive composition as the component (a).
Claim 3
Dependent Claim
30 words
The anisotropically electroconductive adhesive composition as claimed in claim 1 in which the crosslinks in the synthetic rubber or thermoplastic elastomer is formed in the presence of an organic peroxide.
Claim 4
Dependent Claim
19 words
The anisotropically electroconductive adhesive composition as claimed in claim 1 in which the thermoplastic elastomer is a styrene-based elastomer.
Claim 5
Dependent Claim
29 words
The anisotropically electroconductive adhesive composition as claimed in claim 1 in which the synthetic rubber is a synthetic rubber of styrene-butadiene type or a synthetic rubber of styrene-isoprene type.
Claim 6
Dependent Claim
47 words
The anisotropically electroconductive adhesive composition as claimed in claim 1 in which the electrically insulating homogeneous polymeric adhesive composition as the component (a) comprises the uncrosslinked thermoplastic elastomer and the crosslinked thermoplastic elastomer or synthetic rubber in a weight ratio in the range from 3:1 to 1:4.
Claim 7
Dependent Claim
29 words
The composition of claim 1 wherein the amount of component (b) is 5 to 30 parts by volume to 100 parts of the total of components (a-1) and (a-2).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |