US4368279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for mechanically foaming silicone compositions
Assignee: General Electric Co
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Filing: 1981-04-06
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Granted: 1983-01-11
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Expires: 2001-04-06
Abstract
Abstract A method for mechanically foaming a silicone composition comprising (1) beating a gas a silicone composition which may be SiH olefin platinum catalyzed composition, a condensation type of two-component RTV composition or condensation type of one-component RTV composition and then holding the foamed composition for at least 60 seconds under vacuum of at least 600 millimeters of mercury so as to allow the foam to gel and cure.
Inventors
- 👤 Frank J. Modic
- 👤 Bruce E. Boudreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
In a method for producing a silicone foam composition wherein said silicone is a curable silicone elastomer comprised of a crosslinkable polydiorganosiloxane base polymer having a viscosity of from 100 to 200,000 centipoise at 25° C., a crosslinking agent and an amount of curing catalyst effective for promoting a cross-linking cure reaction between said polydiorganosiloxane base polymers and said crosslinking agent thereby providing an elastomeric silicone composition, the improvement which consists essentially of: mechanically beating an inert gas into a mixture of said curable silicone elastomer to foam said silicone elastomer; gelling said curable silicone elastomer under a vacuum of at least 600 mm Hg for at least 60 seconds in the substantial absence of either an external or in situ blowing agent thereby setting-up a foam of said curable silicone elastomer; curing said foam of said silicone elastomer at a temperature of at least 20° C., thereby providing a cured silicone elastomer foam.
Claim 2
Dependent Claim
154 words
In a method for producing a silicone foam composition wherein said silicone is a curable silicone elastomer comprised of a crosslinkable polydiorganosiloxane base polymer having a viscosity of from 100 to 200,000 centipoise at 25° C., a crosslinking agent and an amount of curing catalyst effective for promoting a cross-linking cure reaction between said polydiorganosiloxane base polymers and said crosslinking agent thereby providing an elastomeric silicone composition, the improvement which consists essentially of: mechanically beating an inert gas into a mixture of said curable silicone elastomer to foam said silicone elastomer; gelling said curable silicone elastomer under a vacuum of at least 600 mm Hg for at least 60 seconds in the substantial absence of either an external or in situ blowing agent thereby setting-up a foam of said curable silicone elastomer; curing said foam of said silicone elastomer at a temperature of at least 20° C., thereby providing a cured silicone elastomer foam.
Claim 3
Dependent Claim
23 words
A method as in claim 1 wherein said curable silicone elastomer is a silicon hydride-platinum catalyzed composition having a vinyl-containing diorganopolysiloxane base polymer.
Claim 4
Dependent Claim
23 words
A method as in claim 1 wherein said curable silicone elastomer is a condensation curable composition having a silanol functional diorganopolysiloxane base polymer.
Claim 5
Dependent Claim
22 words
A method as in claim 1 wherein the viscosity of said curable silicone elastomer does not exceed 100,000 centipoise at 25° C.
Claim 6
Dependent Claim
15 words
A method as in claim 1 wherein the vacuum is at least 100 mm Hg.
Claim 7
Dependent Claim
30 words
A method as in claim 5 wherein the composition is heated at a temperature of from 25° C. to 150° C. for a period of 30 seconds to 15 minutes.
Claim 8
Dependent Claim
15 words
A method as in claim 1 wherein said curable silicone elastomer further contains a filler.
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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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |