US4778871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature insulators
Assignee: United States Department of the Navy
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Filing: 1987-08-25
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Granted: 1988-10-18
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Expires: 2007-08-25
Abstract
Abstract A high temperature, high impact, erosion resistant silphenylene-vinylmethylsiloxane elastomer and a process for making the same in which a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer is cured using a combination of hydrosilylation cure and urethane cure techniques.
Inventors
- 👤 James P. Newhouse
- 👤 Robert A. Rhein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08K5/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A process for producing a high temperature, high impact, erosion resistant silphenylene-vinylmethylsiloxane elastomer comprising a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer cured using a combination of hydrosilylation cure and urethane cure techniques comprising mixing at a temperature from about room temperature to about 100° C. a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer of the formula: ##STR3## in which X is selected from the group consisting of ##STR4## R is selected from the group consisting of alkyl radicals and hydrogen, R 1 is selected from the group consisting of alkyl radicals, alkylene radicals, and hydrogen, and n is a number of about 20, with a hydrosilylation cross-linker and a multifunctional organic isocyanate urethane curative.
Claim 2
Dependent Claim
111 words
A process for producing a high temperature, high impact, erosion resistant silphenylene-vinylmethylsiloxane elastomer comprising a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer cured using a combination of hydrosilylation cure and urethane cure techniques comprising mixing at a temperature from about room temperature to about 100° C. a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer of the formula: ##STR3## in which X is selected from the group consisting of ##STR4## R is selected from the group consisting of alkyl radicals and hydrogen, R 1 is selected from the group consisting of alkyl radicals, alkylene radicals, and hydrogen, and n is a number of about 20, with a hydrosilylation cross-linker and a multifunctional organic isocyanate urethane curative.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which said hydrosilylation cross-linker is selected from the group consisting of 1,1,3,3,5,5-hexamethyltrisiloxane, and the reaction product of condensation of p-bis(hydroxydimethylsilyl)benzene with bis(dimethylamine)dimethylsilane.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said urethane curative is tris-isocyanate hexyldiurea.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein a urethane cure catalyst is added to said composition, said catalyst selected from the group consisting of tin-II salts of carboxylic acids, and dialkyl-tin salts of carboxylic acids.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein a solution of chloroplatinic acid in a siloxane base is added to said composition as a hydrosilylation cure catalyst.
Claim 7
Dependent Claim
31 words
The product produced by the process of claim 1 in which the liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer is cured using a combination of a hydrosilylation cure and a urethane cure techniques.
Claim 8
Dependent Claim
31 words
The product produced by the process of claim 2 in which a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer is cured using a combination of a hydrosilylation cure and a urethane cure techniques.
Claim 9
Dependent Claim
31 words
The product produced by the process of claim 3 in which a liquid hydroxyl-terminated silphenylene vinylmethylsiloxane polymer is cured using a combination of a hydrosilylation cure and a urethane cure techniques.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |