US4703095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing copolymer
Assignee: Daikin Industries Ltd
•
Filing: 1986-02-14
•
Granted: 1987-10-27
•
Expires: 2006-02-14
Abstract
Abstract A fluorine-containing copolymer comprising monomeric units of: (a) tetrafluoroethylene, (b) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, and (c) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula: CF2=CF-O-(CF2)n-CF2X wherein X is hydrogen or fluorine, and n is an integer of 3 to 9, on the basis of the weight of the copolymer, which has good moldability and improved stress crack resistance and flex resistance when formed as an article such as a film.
Inventors
- 👤 Shinichi Nakagawa
- 👤 Tsuneo Nakagawa
- 👤 Toshihiko Amano
- 👤 Mitsugu Omori
- 👤 Sadaatsu Yamaguchi
- 👤 Kozo Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:50
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A fluorine-containing copolymer having good moldability comprising the monomeric units of: (a) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, (b) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula: CF.sub.2 ═CF--O--(CF.sub.2).sub.n --CF.sub.2 X wherein X is hydrogen or fluorine, and n is an integer of 3 to 9, on the basis of the weight of the copolymer, and (c) the balance of the copolymer comprises tetrafluoroethylene, said copolymer having a specific melt viscosity of at least 0.5×10 4 poise whereby molded articles such as film derived from said copolymer have improved stress crack resistance and MIT flex resistance.
Claim 2
Dependent Claim
111 words
A fluorine-containing copolymer having good moldability comprising the monomeric units of: (a) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, (b) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula: CF.sub.2 ═CF--O--(CF.sub.2).sub.n --CF.sub.2 X wherein X is hydrogen or fluorine, and n is an integer of 3 to 9, on the basis of the weight of the copolymer, and (c) the balance of the copolymer comprises tetrafluoroethylene, said copolymer having a specific melt viscosity of at least 0.5×10 4 poise whereby molded articles such as film derived from said copolymer have improved stress crack resistance and MIT flex resistance.
Claim 3
Dependent Claim
33 words
A copolymer according to claim 1, wherein said monomeric units comprise 9 to 13% by weight of hexafluoropropene, 0.3 to 1.5% by weight of the fluoroalkyl vinyl ether (I) and the balance tetrafluoroethylene.
Claim 4
Dependent Claim
19 words
A copolymer according to claim 1, wherein n in the formula (I) is an integer of 3 to 7.
Claim 5
Dependent Claim
17 words
A copolymer according to claim 1, having a specific melt viscosity of at least 1×10 4 poise.
References Cited (Backward Citations)
US4262101A
Cited
US4587316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |