US4598135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making norbornane anhydride substituted polyorganosiloxane
Assignee: General Electric Co
•
Filing: 1985-10-31
•
Granted: 1986-07-01
•
Expires: 2005-10-31
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. A reduction in the amount of cyclopolydiorganosiloxane generated in the mixture is realized compared to solvent equilibration procedures.
Inventors
- 👤 Mark A. Buese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:21
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/06; C08G77/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A method for making symmetric or asymmetric substituted norbornane anhydride terminated polydiorganosiloxane which comprises (1) equilibrating under neat conditions in the presence of an effective amount of an equilibration catalyst a mixture comprising (A) norbornane-dicarboxylic anhydride organosiloxane and (B) organosiloxane consisting essentially of a member selected from the class consisting of cyclopolydiorganosiloxane, triorgano terminated polydiorganosiloxane, and a mixtures thereof, (2) recovering norbornane anhydride terminated polydiorganosiloxane from the mixture of (1).
Claim 2
Independent Claim
70 words
A method for making symmetric or asymmetric substituted norbornane anhydride terminated polydiorganosiloxane which comprises (1) equilibrating under neat conditions in the presence of an effective amount of an equilibration catalyst a mixture comprising (A) norbornane-dicarboxylic anhydride organosiloxane and (B) organosiloxane consisting essentially of a member selected from the class consisting of cyclopolydiorganosiloxane, triorgano terminated polydiorganosiloxane, and a mixtures thereof, (2) recovering norbornane anhydride terminated polydiorganosiloxane from the mixture of (1).
Claim 3
Dependent Claim
14 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
14 words
A method in accordance with claim 1, where the organosiloxane is dimethylvinyl terminated polydimethylsiloxane.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1, where the equilibration catalyst is trifluoromethane sulfonic acid.
Claim 7
Dependent Claim
15 words
A method in accordance with claim 1, where the mixture is quenched with magnesium oxide.
References Cited (Backward Citations)
US4381396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |