EP0435554A2
Expired / Lapsed
EP
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Rubber compositions and preparation thereof
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1990-12-19
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Granted: —
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Expires: 2010-12-19
Abstract
Abstract A conductive rubber composition is prepared by blending (A) a rubber composition including natural and/or synthetic rubber and conductive carbon black, with (B) a silicone rubber composition including an organopolysiloxane having the average composition formula: R n SiO (4-n)/2 wherein R is a hydrocarbon group and n is a positive number of from 1.95 to 2.05. This rubber composition and cured products thereof have stable electric resistivity in the semiconductive range and are thus suitable as rubber roll members in business machines.
Inventors
- 👤 Masaharu Takahashi
- 👤 Tsutomu Nakamura
- 👤 Kazuo Numata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:41
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08L; C08L21/00; C08L83/00; C08L83/04; C08L9/00; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A rubber composition comprising in admixture, (A) a rubber composition including natural and/or synthetic rubber and conductive carbon black, and (B) a silicone rubber composition including an organopolysiloxane having the average composition formula (1): wherein R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n is a positive number of from 1.95 to 2.05.
Claim 2
Dependent Claim
17 words
A composition of claim 1 wherein the synthetic rubber is an ethylene-propylene rubber or an ethylene-propylenediene rubber.
Claim 3
Dependent Claim
53 words
A composition of claim 1 wherein the synthetic rubber is selected from: styrene-butadiene rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, butadiene rubber, isoprene rubber, chloroprene rubber, acrylic rubber, silicone-modified EPDM rubber, silicone-modified acrylic rubber, ethylene-acrylate rubber, ethylene-vinyl acetate rubber, urethane rubber, polysulfide rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, fluorinated rubber, and epichlorohydrin rubber.
Claim 4
Dependent Claim
29 words
A composition according to any one of claims 1, 2 and 3 in which rubber compositions (A) and (B) are blended in a weight ratio of 5:95 to 95:5.
Claim 5
Dependent Claim
20 words
A composition according to any one of the preceding claims which contains 5 to 95% by weight of the organopolysiloxane.
Claim 6
Dependent Claim
38 words
A composition according to any one of the preceding claims in which rubber composition (A) contains 1 to 50 parts by weight of carbon black per 100 parts by weight of the total of natural and/or synthetic rubber.
Claim 7
Independent Claim
26 words
A method for preparing a rubber composition according to any one of claims 1 to 6 comprising the step of mixing composition (A) with composition (B).
Claim 8
Dependent Claim
17 words
A rubber article obtainable by curing a composition according to any one of claims 1 to 6.
Claim 9
Dependent Claim
16 words
An article according to claim 8 having a resistivity in the range l0³ to 10¹⁰ Ω.cm.
Claim 10
Dependent Claim
59 words
A semiconductive rubber having a resistivity in the range of 10³ to 10¹⁰ Ω.cm, and comprising a macroscopic dispersion of (A) a first phase which comprises a natural and/or synthetic non-silicone-based rubber composition mixed with conductive carbon black, and (B) a second phase which comprises a silicone rubber composition including an organopolysiloxane and substantially unmixed with conductive carbon black.
References Cited (Backward Citations)
No citation records indexed.
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