US4335035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone rubber composition
Assignee: Momentive Performance Materials Japan LLC
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Filing: 1980-07-30
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Granted: 1982-06-15
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Expires: 2000-07-30
Abstract
Abstract A silicone rubber composition comprising (A) 100 parts by weight of polyorganosiloxane having the formula: <IMAGE> wherein R1 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.01 to 0.3% of the R1 groups are vinyl groups, a is a number of from 1.98 to 2.0001, and n is a number of at least 3,000, (B) 10 to 100 parts by weight of finely divided silica, (C) more than 5 to 20 parts by weight of a polyorganohydrogensiloxane having the formula: <IMAGE> wherein R2 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.2 to 2.5% of the R2 groups are vinyl groups, b is a number of from 1.5 to 2.0, c is a number of from 0.01 to 0.5, the value of (b+c) is in the range of from 1.8 to 2.1, and m is a number of from 30 to 3,000, and (D) 0.01 to 3 parts by weight of organic peroxide.
Inventors
- 👤 Masayuki Hatanaka
- 👤 Atsushi Kurita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:44
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/14; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
182 words
A silicone rubber composition consisting essentially of (A) 100 parts by weight of polyorganosiloxane having the formula: ##EQU5## wherein R 1 is a substituted or unsubstituted monovalent hydrocarbon group, with the proviso that from 0.01 to 0.3% of the total R 1 groups are vinyl groups, a is a number of from 1.98 to 2.001, and n is a number of at least 3,000, (B) 10 to 100 parts by weight of finely divided silica, (C) from more than 5 parts by weight up to 20 parts by weight of polyorganohydrogensiloxane having the formula: ##EQU6## wherein R 2 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.2 to 2.5% of the total R 2 groups are vinyl groups, b is a number of from 1.5 to 2.0, c is a number of from 0.01 to 0.5, the value of (b+c) is in the range of from 1.8 to 2.1, and m is a number of from 30 to 3,000, and (D) 0.01 to 3 parts by weight of an organic peroxide effective for curing silicone rubber compositions.
Claim 2
Dependent Claim
182 words
A silicone rubber composition consisting essentially of (A) 100 parts by weight of polyorganosiloxane having the formula: ##EQU5## wherein R 1 is a substituted or unsubstituted monovalent hydrocarbon group, with the proviso that from 0.01 to 0.3% of the total R 1 groups are vinyl groups, a is a number of from 1.98 to 2.001, and n is a number of at least 3,000, (B) 10 to 100 parts by weight of finely divided silica, (C) from more than 5 parts by weight up to 20 parts by weight of polyorganohydrogensiloxane having the formula: ##EQU6## wherein R 2 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.2 to 2.5% of the total R 2 groups are vinyl groups, b is a number of from 1.5 to 2.0, c is a number of from 0.01 to 0.5, the value of (b+c) is in the range of from 1.8 to 2.1, and m is a number of from 30 to 3,000, and (D) 0.01 to 3 parts by weight of an organic peroxide effective for curing silicone rubber compositions.
Claim 3
Dependent Claim
24 words
A composition as set forth in claim 1 wherein from 0.01 to 0.1% of the total number of R 1 groups are vinyl groups.
Claim 4
Dependent Claim
31 words
A composition as set forth in claim 1 wherein 0 to 10% of the R 1 groups are phenyl groups, and the remainder of the R 1 groups are methyl groups.
Claim 5
Dependent Claim
19 words
A composition as set forth in claim 1 wherein the remainder of the R 1 groups are methyl groups.
Claim 6
Dependent Claim
18 words
A composition as set forth in claim 1 wherein n is a number of from 5,000 to 10,000.
Claim 7
Dependent Claim
23 words
A composition as set forth in claim 1 wherein the finely divided silica is one having its surface treated with an organosilicon compound.
Claim 8
Dependent Claim
33 words
A composition as set forth in claim 1 or claim 3 wherein 0 to 10% of the R 2 groups are phenyl groups and the remainder of R 2 groups are methyl groups.
Claim 9
Dependent Claim
22 words
A composition as set forth in claim 1 or claim 4 wherein the remainder of the R 2 groups are methyl groups.
Claim 10
Dependent Claim
18 words
A composition as set forth in claim 1 wherein m is a number of from 100 to 3,000.
Claim 11
Dependent Claim
22 words
A composition as set forth in claim 1 wherein the amount of the component (C) is 7 to 15 parts by weight.
Claim 12
Dependent Claim
22 words
A composition as set forth in claim 1 wherein the amount of the component (D) is 0.05 to 1 part by weight.
Claim 13
Dependent Claim
43 words
A composition as set forth in claim 1 wherein the remainder of the R 1 groups are methyl groups, the remainder of the R 2 groups are methyl groups and the amount of the component (C) is 7 to 15 parts 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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |