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US5663255A
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Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
Assignee: Chemours Co FC LLC
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Filing: 1995-10-27
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Granted: 1997-09-02
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Expires: 2015-10-27
Abstract
Abstract Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) copolymers, which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
Inventors
- 👤 Colin Anolick
- 👤 Robert Clayton Wheland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:22
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/20; C07; C07C; C07C313/00; C07C313/08; C07C313/18; C07C313/20; C07C317/00; C07C317/02; C07C317/04; C07C317/16; C07C317/18; C08; C08F; C08F214/00; C08F214/18; C08F214/22; C08F214/26; C08F214/265; C08F214/28; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L27/00; C08L27/02; C08L27/12; C08L27/20; C09D123/00; C09D123/02; C09D127/18; C08L2205/00; C08L2205/08; C08L2207/00; C08L2207/06; C08L2207/062; C08L2207/066; C08L27/18; C08L51/00; C08L51/06; C08L77/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
An amorphous polymer, consisting essentially of, repeat units of the formula: (a) at least about 30 mole percent of --CF(CF.sub.3)--CF.sub.2 -- (I) (b) at least about 1 mole percent --CF.sub.2 --CF.sub.2 -- (II) (c) 0 to about 10 mole percent ##STR2## wherein X is --C n F 2n+1 or --OC n F 2n+1 , m is 2, 3 or 4, and n is an integer of 2 to 20, with --C n F 2n+1 or an integer of 1 to 20 with --OC n F 2n+1 ; and provided that in said polymer less than 20 mole percent of (I) is present in the form of triads.
Claim 2
Dependent Claim
107 words
An amorphous polymer, consisting essentially of, repeat units of the formula: (a) at least about 30 mole percent of --CF(CF.sub.3)--CF.sub.2 -- (I) (b) at least about 1 mole percent --CF.sub.2 --CF.sub.2 -- (II) (c) 0 to about 10 mole percent ##STR2## wherein X is --C n F 2n+1 or --OC n F 2n+1 , m is 2, 3 or 4, and n is an integer of 2 to 20, with --C n F 2n+1 or an integer of 1 to 20 with --OC n F 2n+1 ; and provided that in said polymer less than 20 mole percent of (I) is present in the form of triads.
Claim 3
Dependent Claim
20 words
The polymer is recited in claim 1 wherein (II) is at least about 30 mole percent of said repeat unit.
Claim 4
Dependent Claim
14 words
The polymer as recited in claim 1 wherein only (I) and (II) are present.
Claim 5
Dependent Claim
21 words
The polymer as recited in claim 2 wherein (II) is about 50 to about 65 mole percent of said repeat units.
Claim 6
Dependent Claim
21 words
The polymer as recited in claim 1 wherein (III) is about 0.1 to about 10 mole percent of said repeat units.
Claim 7
Dependent Claim
21 words
The polymer as recited in claim 5 wherein (I) is about 50 to about 65 mole percent of said repeat units.
Claim 8
Dependent Claim
21 words
The polymer as recited in claim 5 wherein X is --C n F 2n+1 , wherein n is 2 to 4.
Claim 9
Dependent Claim
24 words
The polymer as recited in claim 5 wherein X is --OC n F 2n+1 , and n is an integer of 1 to 4.
Claim 10
Dependent Claim
23 words
The polymer as recited in claim 1 wherein less than about 15 mole percent of (I) is present in the form of triads.
Claim 11
Dependent Claim
23 words
The polymer as recited in claim 1 wherein less than about 10 mole percent of (I) is present in the form of triads.
Claim 12
Dependent Claim
23 words
The polymer as recited in claim 2 wherein less than about 15 mole percent of (I) is present in the form of triads.
Claim 13
Dependent Claim
18 words
The polymer as recited in claim 1 which has a molecular weight distribution of about 4 or less.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-01 | 2001-03-03 | 2001-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-01 | 2005-03-03 | 2005-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-01 | 2009-03-03 | 2009-09-02 | $7700.00 | Window Closed / Lapsed |