Patent US5209872A successfully refreshed from Google Patents.
US5209872A
Expired / Lapsed
US
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Rubber composition and method for making
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1990-12-18
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Granted: 1993-05-11
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Expires: 2010-12-18
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.sub.(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
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:20
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: 13
Claim 1
Independent Claim
185 words
A rubber composition for preparing a rubber article having a variation of electric resistivity of about one order of magnitude in the range of from 10 3 to 10 10 Ω·cm comprising in admixture, two separate phases (A) and (B) macroscopically dispersed in one another wherein, phase (A) is a rubber composition comprising natural rubber, synthetic rubber, or mixtures thereof, and conductive carbon black, said synthetic rubber being ethylene-propylene rubber, ethylene-propylene-diene rubber, 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, chloro-sulfonated polyethylene rubber, chlorinated polyethylene rubber, fluorinated rubber, epichlorohydrin rubber, or mixtures thereof, and phase (B) is a silicone rubber composition comprising an organopolysiloxane having the average composition formula (1): R.sub.n SiO.sub.(4-n)/2 ( 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, and containing essentially no carbon black, wherein rubber compositions (A) and (B) are combined in a weight ratio of 5:95 to 95:5.
Claim 2
Dependent Claim
185 words
A rubber composition for preparing a rubber article having a variation of electric resistivity of about one order of magnitude in the range of from 10 3 to 10 10 Ω·cm comprising in admixture, two separate phases (A) and (B) macroscopically dispersed in one another wherein, phase (A) is a rubber composition comprising natural rubber, synthetic rubber, or mixtures thereof, and conductive carbon black, said synthetic rubber being ethylene-propylene rubber, ethylene-propylene-diene rubber, 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, chloro-sulfonated polyethylene rubber, chlorinated polyethylene rubber, fluorinated rubber, epichlorohydrin rubber, or mixtures thereof, and phase (B) is a silicone rubber composition comprising an organopolysiloxane having the average composition formula (1): R.sub.n SiO.sub.(4-n)/2 ( 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, and containing essentially no carbon black, wherein rubber compositions (A) and (B) are combined in a weight ratio of 5:95 to 95:5.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein the synthetic rubber is an ethylene-propylene rubber or an ethylene-propylenediene rubber.
Claim 4
Dependent Claim
58 words
The composition of claim 1 wherein the synthetic rubber is selected from the group consisting of a 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 5
Dependent Claim
21 words
The composition of claim 1 wherein rubber compositions (A) and (B) are admixed in a weight ratio of 20:80 to 80:20.
Claim 6
Dependent Claim
15 words
The composition of claim 1 which contains 5 to 95% by weight of the organopolysiloxane.
Claim 7
Dependent Claim
35 words
The composition of claim 1 wherein rubber composition (A) contains 1 to 50 parts by weight of carbon black per 100 parts by weight of the total of natural rubber synthetic rubber or mixture thereof.
Claim 8
Independent Claim
159 words
A method for preparing a rubber composition comprising combining (A) a rubber composition comprising natural rubber, synthetic rubber, or mixtures thereof and conductive carbon black, said synthetic rubber being ethylene-propylene rubber, ethylene-propylene-diene rubber, 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, chloro-sulfonated polyethylene rubber, chlorinated polyethylene rubber, fluorinated rubber, epichlorohydrin rubber, or mixtures thereof, with (B) a silicone rubber composition comprising an organopolysiloxane having the average composition formula (1): R.sub.n SiO.sub.(4-n)/2 ( 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, and containing no carbon black, wherein rubber compositions (A) and (B) are combined in a weight ratio of 5:95 to 95:5 to form a two-phase mixture of rubber compositions (A) and (B) macroscopically dispersed in one another.
Claim 9
Independent Claim
159 words
A method for preparing a rubber composition comprising combining (A) a rubber composition comprising natural rubber, synthetic rubber, or mixtures thereof and conductive carbon black, said synthetic rubber being ethylene-propylene rubber, ethylene-propylene-diene rubber, 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, chloro-sulfonated polyethylene rubber, chlorinated polyethylene rubber, fluorinated rubber, epichlorohydrin rubber, or mixtures thereof, with (B) a silicone rubber composition comprising an organopolysiloxane having the average composition formula (1): R.sub.n SiO.sub.(4-n)/2 ( 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, and containing no carbon black, wherein rubber compositions (A) and (B) are combined in a weight ratio of 5:95 to 95:5 to form a two-phase mixture of rubber compositions (A) and (B) macroscopically dispersed in one another.
Claim 10
Dependent Claim
17 words
The method of claim 7 wherein the synthetic rubber is an ethylene-propylene rubber or an ethylene-propylene-diene rubber.
Claim 11
Dependent Claim
58 words
The method of claim 7 wherein the synthetic rubber is selected from the group consisting of a styrene-butadiene rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, butadiene rubber, isosprene 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 12
Dependent Claim
21 words
The method of claim 7 wherein rubber compositions (A) and (B) are mixed in a weight ratio of 20:80 to 80:20.
Claim 13
Dependent Claim
13 words
A composition of claim 1 which contains 20-80% by weight of the organopolysiloxane.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
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