US4546157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing copolymer
Assignee: Daikin Industries Ltd
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Filing: 1982-09-21
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Granted: 1985-10-08
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Expires: 2002-09-21
Abstract
Abstract A fluorine-containing copolymer comprising monomeric units of (a) from 95.8 to 80% by weight of tetrafluoroethylene, (b) from 4 to 14% by weight of hexafluoropropene, and (c) from 0.2 to 6% by weight of perfluorovinyl ether of the formula: <IMAGE> (I) wherein n is an integer of 1 to 4, and m is an integer of 0 to 3, and having excellent stress crack resistance when formed into a molded article.
Inventors
- 👤 Tsuneo Nakagawa
- 👤 Sadatsu Yamaguchi
- 👤 Toshihiko Amano
- 👤 Kohzoh Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:43
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A fluorine-containing copolymer consisting essentially of monomeric units of (a) from 95.8 to 80% by weight of tetrafluoroethylene, (b) from 4 to 14% by weight of hexafluoropropene, and (c) from 0.2 to 6% by weight of perfluorovinyl ether of the formula: ##STR4## wherein n is an integer of 1 to 4, and m is an integer of 0 to 3.
Claim 2
Dependent Claim
60 words
A fluorine-containing copolymer consisting essentially of monomeric units of (a) from 95.8 to 80% by weight of tetrafluoroethylene, (b) from 4 to 14% by weight of hexafluoropropene, and (c) from 0.2 to 6% by weight of perfluorovinyl ether of the formula: ##STR4## wherein n is an integer of 1 to 4, and m is an integer of 0 to 3.
Claim 3
Dependent Claim
41 words
The fluorine-containing copolymer according to claim 1 consisting essentially of monomeric units of from 94.5 to 83% by weight of tetrafluoroethylene, from 5 to 13% by weight of hexafluoropropene and from 0.5 to 4% by weight of the perfluorovinyl ether (I).
Claim 4
Dependent Claim
17 words
The fluorine-containing copolymer according to claim 1, wherein n in the formula (I) is 1 or 2.
Claim 5
Dependent Claim
10 words
A molded product formed from the copolymer of claim 1.
Claim 6
Dependent Claim
10 words
A molded product formed from the copolymer of claim 2.
Claim 7
Dependent Claim
10 words
A molded product formed from the copolymer of claim 3.
References Cited (Backward Citations)
US3674758A
Cited
US3855191A
Cited
US4038231A
Cited
US4078135A
Cited
US4262101A
Cited
US4381387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |