US4128707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilization of fluoro-organic copolymers of the ethylene series
Assignee: Individual
•
Filing: 1977-07-11
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Granted: 1978-12-05
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Expires: 1997-07-11
Abstract
Abstract A method for stabilization of fluoro-organic copolymers of the ethylene series which comprises mixing said copolymer with xenon difluoride taken in an amount ranging from 0.1 to 15% by weight of the starting copolymer at a temperature not exceeding 20° C. The method according to the present invention makes it possible to produce copolymers and articles therefrom having an increased thermal stability and longer service life as compared to those produced by the prior art methods. The method is versatile. It is applicable to any type of copolymer of the ethylene series containing bonds which are weaker than the C - F bond.
Inventors
- 👤 Olga A. Shustova
- 👤 Georgy P. Gladyshev
- 👤 Eduard K. Kondrashov
- 👤 Leonid D. Shustov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
A method for stabilization of fluoro-organic copolymers of the ethylene series comprising mixing said fluoroorganic copolymer with xenon difluoride taken in an amount of from 0.1 to 15% by weight of the starting copolymer at a temperature of not more than 20° C.
Claim 2
Independent Claim
43 words
A method for stabilization of fluoro-organic copolymers of the ethylene series comprising mixing said fluoroorganic copolymer with xenon difluoride taken in an amount of from 0.1 to 15% by weight of the starting copolymer at a temperature of not more than 20° C.
Claim 3
Dependent Claim
38 words
A method as claimed in claim 1, wherein after mixing a fluoro-organic copolymer of the ethylene series with xenon difluoride the resulting mixture is subjected to a heat treatment at a temperature ranging from 60° to 180° C.
Claim 4
Dependent Claim
54 words
A method as claimed in claim 1, wherein the fluoroorganic copolymers correspond to the formula: (--CF.sub.2 -- CRR'--).sub.n -- (--CF.sub.2 -- CR" R'" --).sub.m wherein R is F or H; R' is a halogen, R" is --(CF═CF--) or H; R'" is H or NO; n = 1 to 4 m = 1 to 4.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1, wherein the stabilization occurs during the manufacture of an article from said copolymer.
References Cited (Backward Citations)
US2913449A
Cited
US3853828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |