Patent US4169117A successfully refreshed from Google Patents.
US4169117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polysulfone resin solution having perfluorocarbon polymer particles dispersed therein
Assignee: EIDP Inc
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Filing: 1975-11-26
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Granted: 1979-09-25
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Expires: 1995-11-26
Abstract
Abstract The novel coating composition contains a uniformly dispersed perfluorocarbon polymer in an organic solvent solution of an aromatic polysulfone resin; finishes of the novel composition have excellent grease and stain resistance, good thermal stability, toughness and durability and good release properties and are useful as coatings for vessels, appliances, industrial equipment and in particular as release finishes for bakeware and cookware.
Inventors
- 👤 Joseph A. Vasta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:31
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; C09D181/00; C09D181/06; C08; C08L; C08L81/00; C08L81/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A coating composition which comprises a polymer mixture of (a) 15% to 85%, by weight of an aromatic polysulfone having repeat units ##STR7## and (b) 85% to 15% by weight of at least one fluorocarbon polymer selected from polytetrafluoroethylene, copolymers of tetrafluoroethylene with about 5% to 50% by weight hexafluoropropylene and polyvinylidene fluoride, said composition being in the form of a dispersion of said fluorocarbon polymer dispersed in a solution of said thermoplastic aromatic polysulfone in a solvent therefor.
Claim 2
Dependent Claim
79 words
A coating composition which comprises a polymer mixture of (a) 15% to 85%, by weight of an aromatic polysulfone having repeat units ##STR7## and (b) 85% to 15% by weight of at least one fluorocarbon polymer selected from polytetrafluoroethylene, copolymers of tetrafluoroethylene with about 5% to 50% by weight hexafluoropropylene and polyvinylidene fluoride, said composition being in the form of a dispersion of said fluorocarbon polymer dispersed in a solution of said thermoplastic aromatic polysulfone in a solvent therefor.
Claim 3
Dependent Claim
20 words
A composition according to claim 1 in which the concentration of thermoplastic aromatic polyfulfone is 50% to 75% by weight.
Claim 4
Dependent Claim
13 words
A composition according to claim 1 in which the fluorocarbon polymer is poly(tetrafluoroethylene).
Claim 5
Dependent Claim
34 words
A method of coating an article which comprises applying to the article a composition as claimed in claim 1, drying the coated article, and sintering the coating at temperatures of 150° to 300° C.
Claim 6
Dependent Claim
24 words
A composition according to claim 3 in which the fluorocarbon polymer is a polytetrafluoroethylene powder having diameters of about 0.01 to about 6 um.
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |