US4028338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorosiloxydiphenylsiloxy block copolymers
Assignee: General Electric Co
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Filing: 1975-10-09
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Granted: 1977-06-07
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Expires: 1995-10-09
Abstract
Abstract There is provided by the present invention a solvent resistant block copolymer having desirable processability comprising a copolymer of the formula, ##STR1## WHERE R is an alkyl radical of 1 to 3 carbon atoms, R 1 is a perfluoroalkyl radical of 1 to 8 carbon atoms, Vi is vinyl, B is selected from the class consisting of lithium and hydrogen, x varies from 20 to 400 and y varies from 700 to 6000 and z varies from 0 to 100. There is also provided by the present invention an advantageous process for producing the above block copolymer.
Inventors
- 👤 John S. Razzano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:42
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A solvent resistant block copolymer having desirable processability comprising a copolymer of the formula, where R is an alkyl radical of 1 to 3 carbon atoms, R 1 is a perfluoroalkyl radical of 1 to 8 carbon atoms, Vi is vinyl, B is selected from the class consisting of lithium and hydrogen, z varies from 0 to 100, x varies from 20 to 400 and y varies from 700 to 6000.
Claim 2
Dependent Claim
71 words
A solvent resistant block copolymer having desirable processability comprising a copolymer of the formula, where R is an alkyl radical of 1 to 3 carbon atoms, R 1 is a perfluoroalkyl radical of 1 to 8 carbon atoms, Vi is vinyl, B is selected from the class consisting of lithium and hydrogen, z varies from 0 to 100, x varies from 20 to 400 and y varies from 700 to 6000.
Claim 3
Dependent Claim
19 words
The copolymer of claim 1 wherein R is methyl and R 1 is CF 3 and B is hydrogen.
Claim 4
Dependent Claim
19 words
The copolymer of claim 1 wherein x varies from 100 to 200 and y varies from 1000 to 2500.
References Cited (Backward Citations)
US3337497A
Cited
US3503926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |