US4252859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoropolymer blend coating compositions containing copolymers of perfluorinated polyvinyl ether
Assignee: EIDP Inc
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Filing: 1978-10-31
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Granted: 1981-02-24
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Expires: 1998-10-31
Abstract
Abstract Blends of PTFE and perfluorinated ether copolymers of TFE and perfluoro(propyl vinyl ether) provide coating compositions which have reduced crystallinity and useful lives superior to what would be expected from averaging the properties of the unblended resins themselves.
Inventors
- 👤 Thomas P. Concannon
- 👤 Eva M. Vary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
B; B05; B05D; B05D5/00; B05D5/08; B05D5/083; C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; C09D127/20; B05D2401/00; B05D2401/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A coating composition comprising, by weight, (A) 50-95% of a particulate polymer of monoethylenically unsaturated hydrocarbon monomers completely substituted with fluorine atoms or a combination of fluorine atoms and chlorine atoms, the polymer having a number average molecular weight of at least 20,000; and (B) 10-50% of a perfluorinated copolymer containing (i) 99.5-92% tetrafluoroethylene, (ii) 0.5-8% at least one vinyl ether having the formula: CF.sub.2 ═CF--O--R.sub.f in which R f represents one or more perfluoroalkyl radicals having from 1 to 10 carbon atoms or a perfluorinated ether having the formula: ##STR2## in which n is zero to 4, and optionally, (iii) hexafluoropropylene.
Claim 2
Dependent Claim
102 words
A coating composition comprising, by weight, (A) 50-95% of a particulate polymer of monoethylenically unsaturated hydrocarbon monomers completely substituted with fluorine atoms or a combination of fluorine atoms and chlorine atoms, the polymer having a number average molecular weight of at least 20,000; and (B) 10-50% of a perfluorinated copolymer containing (i) 99.5-92% tetrafluoroethylene, (ii) 0.5-8% at least one vinyl ether having the formula: CF.sub.2 ═CF--O--R.sub.f in which R f represents one or more perfluoroalkyl radicals having from 1 to 10 carbon atoms or a perfluorinated ether having the formula: ##STR2## in which n is zero to 4, and optionally, (iii) hexafluoropropylene.
Claim 3
Dependent Claim
12 words
The coating composition of claim 1 which also contains a liquid carrier.
Claim 4
Dependent Claim
16 words
The coating composition of claim 2 wherein (A) and (B) are present as an aqueous dispersion.
Claim 5
Dependent Claim
17 words
The coating composition of claim 1 without liquid carriers wherein (A) and (B) are in particulate fporm.
Claim 6
Dependent Claim
32 words
The coating composition of claim 1 wherein (B) is one or more copolymers of perfluoroalkyl perfluorovinyl ethers with tetrafluoroethylene, said ether having the formula ##STR3## in which n is 1 to 4.
Claim 7
Dependent Claim
47 words
The coating composition of claim 1 wherein (B) is a terpolymer consisting of, in copolymerized form, (a) tetrafluoroethylene, (b) between about 1 and about 12 weight percent hexafluoropropylene, and (c) between about 0.5 and about 6 weight percent of either perfluoro(ethyl vinyl ether) or perfluoro(n-propyl vinyl ether).
Claim 8
Dependent Claim
10 words
The coating composition of claim 5 wherein (A) is polytetrafluoroethylene.
Claim 9
Dependent Claim
21 words
The coating composition of claim 7 wherein (B) is a copolymer consisting of, in copolymerized form, polytetrafluoroethylene and perfluoro(propyl vinyl ether).
Claim 10
Dependent Claim
25 words
The coating composition of claim 1 wherein (B) is present in an amount of 10-30% by weight based on the total of (A) plus (B).
Claim 11
Dependent Claim
23 words
The coating composition of claim 1 wherein (B) is a copolymer consisting of, in copolymerized form, 99.5-92% tetrafluoroethylene and 0.5-8% perfluoro(propyl vinyl ether).
Claim 12
Dependent Claim
23 words
The coating composition of claim 10 wherein (B) is a copolymer consisting of, in copolymerized form, 99-96% tetrafluoroethylene and -4% perfluoro(propyl vinyl ether).
Claim 13
Dependent Claim
38 words
A coated article comprising a substrate having on it a cured coating which has been formed by applying a coating composition of claim 10 and heating to a temperature and for a time sufficient to cure said coating.
Claim 14
Dependent Claim
29 words
A coated article according to claim 12 wherein said cured coating has a crystallinity reduced from that which would be predicted by averaging the crystallinity of (A) and (B).
Claim 15
Dependent Claim
37 words
A process of coating a substrate wherein a coating composition of claim 10 is applied to a substrate and cured by heating at temperatures of at least 315° C. for a time sufficient to cure said coating.
Claim 16
Dependent Claim
27 words
The process of claim 14 wherein the cured coating has a crystallinity reduced from that which would be predicted by averaging the crystallinity of (A) and (B).
Claim 17
Dependent Claim
14 words
The process of claim 14 wherein the heating is done at about 420° C.
Claim 18
Dependent Claim
17 words
The coated article of claim 11, 12 or 13 in the form of an article of cookware.
Claim 19
Dependent Claim
29 words
The coating composition of claim 5, 6, 7, 8, 9 or 10 which also contains a liquid carrier and wherein (A) and (B) are present as an aqueous dispersion.
Claim 20
Dependent Claim
28 words
The process of claim 13, 15 or 16 wherein the coating composition also contains a liquid carrier and wherein (A) and (B) are present as an aqueous dispersion.
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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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |