US3832420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone elastomer containing polymonomethylsiloxane
Assignee: Dow Silicones Corp
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Filing: 1973-09-20
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Granted: 1974-08-27
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Expires: 1993-09-20
Abstract
Abstract Compositions having at least 10 parts by weight of polymonomethylsiloxane dispersed in 100 parts of a silicone elastomer composition are useful as heat shrinkable materials when in the vulcanized state. The polymonomethylsiloxanes are benzene soluble, further condensable, solid at room temperature, have a melting point not exceeding 125* C., and have a gel time sufficiently long to allow complete dispersion during compounding.
Inventors
- 👤 H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:44
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
A silicone elastomer obtained by vulcanizing the composition of claim 1 which is extendable at least 50 percent beyond its original size when heated at least above the melting point of said polymonomethylsiloxane, retains its extended state when cooled at least below the melting point of said polymonomethylsiloxane while in the extended state and returns to approximately its original state when heated at least above the melting point of said polymonomethylsiloxane.
Claim 2
Dependent Claim
46 words
The composition according to claim 1 wherein the silicone elastomer composition is based on a polydiorganosiloxane gum having units selected from the group consisting of dimethylsiloxane units and methylvinylsiloxane units and endblocking units selected from the group consisting of hydroxyl groups, dimethylvinylsiloxy units and trimethylsiloxy units.
Claim 3
Dependent Claim
71 words
The silicone elastomer obtained by vulcanizing the composition of claim 3 which is extendable at least 50 percent beyond its original size when heated at least above the melting point of said polymonomethylsiloxane, retains its extended state when cooled at least below the melting point of said polymonomethylsiloxane while in the extended state and returns to approximately its original state when heaTed at least above the melting point of said polymonomethylsiloxane.
References Cited (Backward Citations)
US3759867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |