US4753976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant rubber composition having improved mechanical properties
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1986-08-22
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Granted: 1988-06-28
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Expires: 2006-08-22
Abstract
Abstract The rubber composition without formulating a carbon black filler has a remarkably low Mooney viscosity and still is capable of giving a rubber vulcanizate having excellent mechanical properties. The rubber composition comprises, in addition to natural rubber or a diene-based synthetic rubber and a non-carbon inorganic filler, a specific poly(dialkoxysiloxane) terminated at each molecular chain end with a polysulfide linkage-containing group of the formula (RO)3Si-R1-Sx- R1-bonded to the terminal silicon atom, in which R is an alkyl group, e.g. methyl and ethyl, R1 is a divalent hydrocarbon group, e.g. -CH2CH2CH213 , and x is a positive integer of 2 to 6 or, typically, 4.
Inventors
- 👤 Hiroshi Yoshioka
- 👤 Ichiro Ono
- 👤 Hitoshi Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:19
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/28; C08K; C08K5/00; C08K5/54; C08K5/548; C08L; C08L21/00; C08L81/00; C08L81/04; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A rubber composition which comprises: (a) 100 parts by weight of natural rubber or a diene-based synthetic rubber; (b) from 5 to 100 parts by weight of a non-carbon inorganic filler; and (c) from 0.1 to 20 parts by weight of a polysulfide linkage-containing organopolysiloxane represented by the general formula (RO).sub.3 Si--R.sup.1 --S.sub.x --R.sup.1 --Si(OR).sub.2 --O--[--Si(OR).sub.2 --O--].sub.n--Si(OR).sub.2 --R.sup.1 --S.sub.x --R.sup.1 --Si(OR).sub.3 in which each R is, independently from the others, an alkyl group having from 1 to 4 carbon atoms, R 1 is a divalent hydrocarbon group having from 1 to 10 carbon atoms, x is a positive integer of from 2 to 6 and n is a positive integer of from 1 to 5.
Claim 2
Dependent Claim
115 words
A rubber composition which comprises: (a) 100 parts by weight of natural rubber or a diene-based synthetic rubber; (b) from 5 to 100 parts by weight of a non-carbon inorganic filler; and (c) from 0.1 to 20 parts by weight of a polysulfide linkage-containing organopolysiloxane represented by the general formula (RO).sub.3 Si--R.sup.1 --S.sub.x --R.sup.1 --Si(OR).sub.2 --O--[--Si(OR).sub.2 --O--].sub.n--Si(OR).sub.2 --R.sup.1 --S.sub.x --R.sup.1 --Si(OR).sub.3 in which each R is, independently from the others, an alkyl group having from 1 to 4 carbon atoms, R 1 is a divalent hydrocarbon group having from 1 to 10 carbon atoms, x is a positive integer of from 2 to 6 and n is a positive integer of from 1 to 5.
Claim 3
Dependent Claim
31 words
The rubber composition as claimed in claim 1 wherein the divalent hydrocarbon group denoted by R 1 is a propylene group of the formula --CH 2 CH 2 CH 2 --.
Claim 4
Dependent Claim
22 words
The rubber composition as claimed in claim 1 wherein the alkyl group denoted by R is a methyl or an ethyl group.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |