US4587316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine-containing copolymers and films thereof
Assignee: Daikin Industries Ltd
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Filing: 1984-01-31
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Granted: 1986-05-06
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Expires: 2004-01-31
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 (I) 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 improved stress crack resistance, and flex resistance as well as good moldability.
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
2026-10-25 10:35
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A film of a fluorine-containing copolymer comprising 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)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 comprising tetrafluoroethylene, said copolymer having a specific melt viscosity of at least 0.5 × 10 4 poise, said film derived therefrom having a good flex resistance of at least 3,000 cycles of bending without being broken when subjected to a MIT flex resistance test.
Claim 2
Dependent Claim
119 words
A film of a fluorine-containing copolymer comprising 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)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 comprising tetrafluoroethylene, said copolymer having a specific melt viscosity of at least 0.5 × 10 4 poise, said film derived therefrom having a good flex resistance of at least 3,000 cycles of bending without being broken when subjected to a MIT flex resistance test.
Claim 3
Dependent Claim
37 words
A copolymer according to claim 1, wherein the composition of the monomeric units is 9 to 13% by weight of hexafluoropropene, 0.3 to 1.5% by weight of the fluoroalkyl vinyl ether (I) and the balance of 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
18 words
A copolymer according to claim 1, which has a specific melt viscosity of at least 1×10 4 poise.
Claim 6
Dependent Claim
17 words
A film according to claim 1, which has at least 5,000 cycles of a MIT flex resistance.
References Cited (Backward Citations)
US4262101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |