US4634755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making norbornane anhydride substituted polyorganosiloxane
Assignee: General Electric Co
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Filing: 1986-03-03
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Granted: 1987-01-06
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Expires: 2006-03-03
Abstract
Abstract A method is provided for making norbornane anhydride substituted organosiloxane by equilibrating norbornane anhydride organosiloxane with cyclopolydiorganosiloxane, organopolysiloxane and mixtures thereof under neat conditions in the presence of an acidic equilibration catalyst followed by quenching the resulting mixture with a silazane and thereafter devolatilizing the resulting equilibrated product.
Inventors
- 👤 John E. Hallgren
- 👤 Diane V. Brezniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:22
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/06; C08G77/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A method which comprises, (1) equilibrating under neat conditions a mixture comprising a norbornane anhydride organosiloxane and cyclopolydiorganosiloxane in the presence of an acidic equilibration catalyst, (2) quenching the resulting mixture of (1) with an organosilazane, utilizing at least two moles of organosilazane, per mole of acidic equilibration catalyst and (3) heating the resulting mixture of (2) under reduced pressure to effect the removal of volatiles.
Claim 2
Independent Claim
66 words
A method which comprises, (1) equilibrating under neat conditions a mixture comprising a norbornane anhydride organosiloxane and cyclopolydiorganosiloxane in the presence of an acidic equilibration catalyst, (2) quenching the resulting mixture of (1) with an organosilazane, utilizing at least two moles of organosilazane, per mole of acidic equilibration catalyst and (3) heating the resulting mixture of (2) under reduced pressure to effect the removal of volatiles.
Claim 3
Dependent Claim
16 words
A method in accordance with claim 1 where the norbornane dicarboxylic anhydride is 1,3-bis(norbornane-dicarboxylic anhydride) tetraorganodisiloxane.
Claim 4
Dependent Claim
12 words
A method in accordance with claim 1 where the organosiloxane is cyclopolydimethylsiloxane.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1 where the organosiloxane is dimethylvinyl-terminated dimethylsiloxane.
Claim 6
Dependent Claim
12 words
A method in accordance with claim 1 where the silazane is hexamethyldisilazane.
Claim 7
Dependent Claim
15 words
A method in accordance with claim 1 where the equilibration catalyst is trifluoromethane sulfonic acid.
References Cited (Backward Citations)
US4381396A
Cited
US4598135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |