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US5082596A
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Electroconductive silicone rubber composition and cured silicone rubber article thereof
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1989-10-03
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Granted: 1992-01-21
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Expires: 2009-10-03
Abstract
Abstract An electroconductive silicone rubber having a high electroconductivity and retaining the good workability in compounding and molding and excellent properties inherent in silicone rubbers in general can be obtained by compounding a curable organopolysiloxane composition comprising a gum-like diorganopolysiloxane, carbon black as a conductivity-imparting agent and a curing agent with a cured silicone rubber powder of spherical particle configuration having specified particle diameter and specified sphericity which partially replaces the diorganopolysiloxane gum.
Inventors
- 👤 Takeshi Fukuda
- 👤 Kunihiko Mita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:13
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
An electroconductive silicone rubber composition which comprises, in admixture: (a) a diorganopolysiloxane represented by the average unit formula R.sub.n SiO.sub.(4-n)/2, in which R is a substituted or unsubstituted monovalent hydrocarbon group selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl wherein each of said groups contains up to 7 carbon atoms and the subscript n is a positive number in the range of from 1.95 to 2.05; (b) cured silicone rubber in the form of a powder of which the particles have a spherical configuration with a sphericity of 0.8 to 1 and an average particle diameter in the range from 0.1 to 100 μm; (c) carbon black in an amount ranging from 5 to 100 parts by weight per 100 parts by weight of the total amount of components (a) and (b); and (d) a curing agent, the proportion of the component (a) to component (b) being in the range from 95:5 to 50:50 by weight.
Claim 2
Dependent Claim
159 words
An electroconductive silicone rubber composition which comprises, in admixture: (a) a diorganopolysiloxane represented by the average unit formula R.sub.n SiO.sub.(4-n)/2, in which R is a substituted or unsubstituted monovalent hydrocarbon group selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl wherein each of said groups contains up to 7 carbon atoms and the subscript n is a positive number in the range of from 1.95 to 2.05; (b) cured silicone rubber in the form of a powder of which the particles have a spherical configuration with a sphericity of 0.8 to 1 and an average particle diameter in the range from 0.1 to 100 μm; (c) carbon black in an amount ranging from 5 to 100 parts by weight per 100 parts by weight of the total amount of components (a) and (b); and (d) a curing agent, the proportion of the component (a) to component (b) being in the range from 95:5 to 50:50 by weight.
Claim 3
Dependent Claim
30 words
The electroconductive silicone rubber composition as claimed in claim 1 wherein the proportion of the component (a) to component (b) is in the range from 90:10 to 60:40 by weight.
Claim 4
Dependent Claim
22 words
The electroconductive silicone rubber composition as claimed in claim 1 wherein the curing agent as the component (d) is an organic peroxide.
Claim 5
Dependent Claim
170 words
An electroconductive cured silicone rubber article which is shaped and cured body of a silicone rubber composition comprising, in admixture: (a) a diorganopolysiloxane represented by the average unit formula R.sub.n Sio.sub.(4-n)/2, in which R is a substituted or unsubstituted monovalent hydrocarbon group selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl wherein each of said groups contains up to 7 carbon atoms and the subscript n is a positive number in the range of from 1.95 to 2.05; (b) cured silicone rubber in the form of a powder of which the particles have a spherical configuration with a sphericity of 0.8 to 1 and an average particle diameter in the range from 0.1 to 100 m; (c) carbon black in an amount ranging from 5 to 100 parts by weight per 100 parts by weight of the total amount of components (a) and (b); and (d) a curing agent, the proportion of the component (a) to component (b) being in the range from 95:5 to 50:50 by weight.
Claim 6
Dependent Claim
170 words
An electroconductive cured silicone rubber article which is shaped and cured body of a silicone rubber composition comprising, in admixture: (a) a diorganopolysiloxane represented by the average unit formula R.sub.n Sio.sub.(4-n)/2, in which R is a substituted or unsubstituted monovalent hydrocarbon group selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl wherein each of said groups contains up to 7 carbon atoms and the subscript n is a positive number in the range of from 1.95 to 2.05; (b) cured silicone rubber in the form of a powder of which the particles have a spherical configuration with a sphericity of 0.8 to 1 and an average particle diameter in the range from 0.1 to 100 m; (c) carbon black in an amount ranging from 5 to 100 parts by weight per 100 parts by weight of the total amount of components (a) and (b); and (d) a curing agent, the proportion of the component (a) to component (b) being in the range from 95:5 to 50:50 by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |