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Patent US4950779A successfully refreshed from Google Patents.
US4950779A
Expired / Lapsed
US
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Nonaqueous method for making silicone oligomers
Assignee: General Electric Co
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Filing: 1989-12-04
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Granted: 1990-08-21
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Expires: 2009-12-04
Abstract
Abstract A nonaqueous method is provided for making silicone oligomers by using stoichiometric amounts of formic acid to effect the condensation of polyalkoxysilanes or polayminosilanes. Reaction can be effected under ambient conditions.
Inventors
- 👤 Jeffrey H. Wengrovius
- 👤 Virginia M. VanValkenburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:21
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C07F7/21
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A nonaqueous method for making silicone oligomers having from about 2 to about 10,000 condensed siloxy units selected from cyclic, linear, branched and mixtures of such structures, which comprises (1) agitating at a temperature of from 20° C. to 150° C., substantially equal molar amounts of formic acid and an organosilane selected from polyalkoxysilanes and polyaminosilanes until the resulting mixture is substantially free of organosilane, and (2) recovering the silicone oligomer from the mixture of (1).
Claim 2
Dependent Claim
76 words
A nonaqueous method for making silicone oligomers having from about 2 to about 10,000 condensed siloxy units selected from cyclic, linear, branched and mixtures of such structures, which comprises (1) agitating at a temperature of from 20° C. to 150° C., substantially equal molar amounts of formic acid and an organosilane selected from polyalkoxysilanes and polyaminosilanes until the resulting mixture is substantially free of organosilane, and (2) recovering the silicone oligomer from the mixture of (1).
Claim 3
Dependent Claim
19 words
A method in accordance with claim 1, where an ion-exchange resin is used to accelerate the reaction in (1).
Claim 4
Dependent Claim
13 words
A method in accordance with claim 1, where the organosilane is a polyalkoxysilane.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1, where the organosilane is a polyaminosilane.
Claim 6
Dependent Claim
12 words
A method in accordance with claim 1, where the polyalkoxysilane is dimethoxydimethylsilane.
Claim 7
Dependent Claim
13 words
A method in accordance with claim 1, where the polyalkoxysilane is an alkenylalkyldialkoxysilane.
Claim 8
Dependent Claim
12 words
A method in accordance with claim 1, where the polyalkoxysilane is methyltrimethoxysilane.
Claim 9
Dependent Claim
12 words
A method in accordance with claim 1, where the polyaminosilane is dimethylbis(diethylamino)silane.
Claim 10
Dependent Claim
25 words
A method in accordance with claim 1, where a mixture of alkylformate and alkanol is distilled from the mixture in step (1) as it forms.
Claim 11
Dependent Claim
17 words
A method in accordance with claim 9, where the alkyl formate is methylformate and alkanol is methanol.
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |