US3932555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone elastomers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-07-16
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Granted: 1976-01-13
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Expires: 1993-07-16
Abstract
Abstract A reinforced silicone elastomer formed from 95% to 20% by weight of a cross-linkable poly(organo siloxane) and from 5% to 80% by weight of a polymerisable ethylenically unsaturated material by cross-linking a substantial proportion of the poly(organosiloxane) before a substantial proportion of the ethylenically unsaturated material is polymerised, the ethylenically unsaturated material subsequently being polymerised.
Inventors
- 👤 John Eric Goodrich
- 👤 Francis Gowland Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:38
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/02; C08G77/04; C08G77/12; C08G77/14; C08G77/16; Y; Y10; Y10S; Y10S525/00; Y10S525/912; Y10S525/925
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A reinforced silicone elastomer comprising a blend of from 95% to 20% by weight of cross-linked silicone elastomer and from 5% to 80% by weight of a polymeric material in which the reinforced silicone elastomer is formed from a composition comprising at least one cross-linkable poly(organo-siloxane) comprising repeat units having the structure ##EQU2## where x is an integer and the groups R and R', which may be the same or different, are hydrocarbyl radicals or substituted hydrocarbyl radicals, and at least one polymerisable ethylenically unsaturated material, and in which a substantial proportion of the cross-linking of the polyorganosiloxane is effected before a substantial proportion of the ethylenically unsaturated material is polymerised, the ethylenically unsaturated material subsequently being polymerised.
Claim 2
Dependent Claim
118 words
A reinforced silicone elastomer comprising a blend of from 95% to 20% by weight of cross-linked silicone elastomer and from 5% to 80% by weight of a polymeric material in which the reinforced silicone elastomer is formed from a composition comprising at least one cross-linkable poly(organo-siloxane) comprising repeat units having the structure ##EQU2## where x is an integer and the groups R and R', which may be the same or different, are hydrocarbyl radicals or substituted hydrocarbyl radicals, and at least one polymerisable ethylenically unsaturated material, and in which a substantial proportion of the cross-linking of the polyorganosiloxane is effected before a substantial proportion of the ethylenically unsaturated material is polymerised, the ethylenically unsaturated material subsequently being polymerised.
Claim 3
Dependent Claim
24 words
A reinforced silicone elastomer as claimed in claim 1 in which the composition contains at least one cross-linking agent reactive with the poly(organo siloxane).
Claim 4
Dependent Claim
19 words
A reinforced silicone elastomer as claimed in claim 1 in which the groups R and R' are both alkyl.
Claim 5
Dependent Claim
19 words
A reinforced silicone elastomer as claimed in claim 3 in which the groups R and R' are both methyl.
Claim 6
Dependent Claim
24 words
A reinforced silicone elastomer as claimed in claim 1 in which the poly(organo siloxane) has a molecular weight in the range 40,000 to 200,000.
Claim 7
Dependent Claim
22 words
A reinforced silicone elastomer as claimed in claim 1 in which the ethylenically unsaturated material comprises at least one ethylenically unsaturated monomer.
Claim 8
Dependent Claim
29 words
A reinforced silicone elastomer as claimed in claim 6 in which the ethylenically unsaturated material comprises at least one ethylenically unsaturated monomer containing a plurality of ethylenically unsaturated groups.
Claim 9
Dependent Claim
30 words
A reinforced silicone elastomer as claimed in claim 1 in which cross-linking of the poly(organo-siloxane) is effected substantially to completion before commencement of polymerisation of the polymerisable ethylenically unsaturated material.
Claim 10
Dependent Claim
32 words
A reinforced silicone elastomer as claimed in claim 1 in which the poly(organo siloxane) comprises a plurality of hydroxyl groups and the cross-linking agent is an alkyl silicate or an alkyl polysilicate.
Claim 11
Dependent Claim
30 words
A reinforced silicone elastomer as claimed in claim 1 in which the poly(organo siloxane) comprises a pluraltiy of ethylenically unsaturated groups and the cross-linking agent is an alkyl hydrogeno polysiloxane.
Claim 12
Dependent Claim
32 words
A reinforced silicone elastomer as claimed in claim 1 in which in the composition the cross-linking agent is present in a proportion of 1% to 5% by weight of the poly(organo siloxane).
Claim 13
Dependent Claim
19 words
A reinforced silicone elastomer as claimed in claim 1 which comprises at least 10% by weight of polymeric material.
Claim 14
Dependent Claim
31 words
A reinforced silicone elastomer as claimed in claim 12 which comprises from 75% to 50% by weight of cross-linked silicone elastomer and from 25% to 50% by weight of polymeric material.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |