US4011197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of curing organosiloxane compositions using microwaves
Assignee: Dow Silicones Corp
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Filing: 1975-09-18
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Granted: 1977-03-08
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Expires: 1995-09-18
Abstract
Abstract Organosiloxane compositions which contain at least five weight percent of organic radicals selected from aryl radicals, chlorinated aliphatic hydrocarbon radicals, fluorinated aliphatic hydrocarbon radicals, hydrocarbon radicals having carbon-bonded mercapto groups, hydrocarbon radicals having carbinol groups and aliphatic hydrocarbon ether radicals and comprise an organosiloxane polymer and a heat accelerated curing mechanism can be cured into useful products such as elastomers and resins by exposing these compositions to a microwave source having frequencies of from 900 to 5,000 mega Hertz until the composition cures.
Inventors
- 👤 Chi-Long Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:33
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/12; C08G77/14; C08G77/22; C08G77/24; C08G77/28; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A method of curing a siloxane composition comprising exposing an organosiloxane composition to a microwave source having frequencies of from 900 to 5,000 mega Hertz until the organosiloxane has cured to a three dimensional network, said organosiloxane composition comprising an organosiloxane polymer and a heat accelerated curing mechanism, the organosiloxane composition having at least five weight percent of the silicon-bonded organic radicals selected from the group consisting of aryl radicals, chlorinated aliphatic hydrocarbon radicals, fluorinated aliphatic hydrocarbon radicals, hydrocarbon radicals having at least one carbon-bonded mercapto group, hydrocarbon radicals having at least one carbinol group and aliphatic hydrocarbon ether radicals, wherein all the organic radicals are bonded to silicon atoms through silicon-carbon bonds and any atom other than carbon or hydrogen being separated from the silicon atom by at least three carbon atoms, any remaining silicon-bonded organic radicals bonded to the silicon atom through silicon-carbon bonds in the organosiloxane composition being aliphatic hydrocarbon radicals.
Claim 2
Independent Claim
154 words
A method of curing a siloxane composition comprising exposing an organosiloxane composition to a microwave source having frequencies of from 900 to 5,000 mega Hertz until the organosiloxane has cured to a three dimensional network, said organosiloxane composition comprising an organosiloxane polymer and a heat accelerated curing mechanism, the organosiloxane composition having at least five weight percent of the silicon-bonded organic radicals selected from the group consisting of aryl radicals, chlorinated aliphatic hydrocarbon radicals, fluorinated aliphatic hydrocarbon radicals, hydrocarbon radicals having at least one carbon-bonded mercapto group, hydrocarbon radicals having at least one carbinol group and aliphatic hydrocarbon ether radicals, wherein all the organic radicals are bonded to silicon atoms through silicon-carbon bonds and any atom other than carbon or hydrogen being separated from the silicon atom by at least three carbon atoms, any remaining silicon-bonded organic radicals bonded to the silicon atom through silicon-carbon bonds in the organosiloxane composition being aliphatic hydrocarbon radicals.
Claim 3
Dependent Claim
18 words
The method in accordance with claim 1 in which the heat accelerated curing mechanism is an organic peroxide.
Claim 4
Dependent Claim
30 words
The method in accordance with claim 1 in which the heat accelerated curing mechanism is a combination of an organohydrogensiloxane crosslinking agent, a platinum catalyst and a platinum catalyst inhibitor.
Claim 5
Dependent Claim
15 words
The method in accordance with claim 2 in which the organosiloxane polymer is a polydiorganosiloxane.
Claim 6
Dependent Claim
14 words
The method in accordance with claim 3 in which the organosiloxane polymer is polydiorganosiloxane.
Claim 7
Dependent Claim
29 words
The method in accordance with claim 1 in which the organosiloxane polymer is a resinous polymer having an average of from 0.5 to 1.8 organic radicals per silicon atom.
Claim 8
Dependent Claim
18 words
The method in accordance with claim 6 in which the heat accelerated curing mechanism is a lead catalyst.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |