Patent US3981945A successfully refreshed from Google Patents.
US3981945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions comprising a polysulfone and a fluorocarbon polymer
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-04-16
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Granted: 1976-09-21
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Expires: 1994-04-16
Abstract
Abstract A coating composition is provided which comprises (a) 10% to 90% by weight of at least one thermoplastic aromatic polysulphones preferably having a reduced viscosity of at least 0.3 (measured at 25 DEG C on a solution in dimethyl formamide containing 1 g of polymer in 100 cm3 of solution) and (b) 90% to 10% by weight of at least one fluorocarbon polymer.
Inventors
- 👤 Terence Edwin Attwood
- 👤 Barry William Farrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:53
CPC Classifications
C; C09; C09D; C09D181/00; C09D181/06; C09D127/00; C09D127/02; C09D127/12; C08; C08L; C08L81/00; C08L81/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A coating composition which comprises a polymer mixture of (a) 10% to 90% by weight of at least one thermoplastic aromatic polysulphone having repeat units ##SPC8## alone or in conjunction with repeat units selected from at least one of ##SPC9## or repeat units (ii) or (iii) in conjunction with repeat units ##SPC10## and, correspondingly, 90% to 10% by weight of at least one fluorocarbon polymer selected from polytetrafluoroethylene and copolymers of tetrafluoroethylene with up to 15% by weight of another unsaturated monomer, said composition being in the form of a dispersion of said fluorocarbon polymer dispersed in a solution of said thermoplastic aromatic polysulphone in a solvent therefor.
Claim 2
Dependent Claim
108 words
A coating composition which comprises a polymer mixture of (a) 10% to 90% by weight of at least one thermoplastic aromatic polysulphone having repeat units ##SPC8## alone or in conjunction with repeat units selected from at least one of ##SPC9## or repeat units (ii) or (iii) in conjunction with repeat units ##SPC10## and, correspondingly, 90% to 10% by weight of at least one fluorocarbon polymer selected from polytetrafluoroethylene and copolymers of tetrafluoroethylene with up to 15% by weight of another unsaturated monomer, said composition being in the form of a dispersion of said fluorocarbon polymer dispersed in a solution of said thermoplastic aromatic polysulphone in a solvent therefor.
Claim 3
Dependent Claim
20 words
A composition according to claim 1 in which the concentration of thermoplastic aromatic polysulphone is 15% to 85% by weight.
Claim 4
Dependent Claim
20 words
A composition according to claim 2 in which the concentration of thermoplastic aromatic polysulphone is less than 60% by weight.
Claim 5
Dependent Claim
13 words
A composition according to claim 1 in which the fluorocarbon polymer is poly(tetrafluoroethylene).
Claim 6
Dependent Claim
19 words
A composition according to claim 1 in which the thermoplastic aromatic polysulphone has repeating units of the formula ##SPC11##
Claim 7
Dependent Claim
33 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 330°C to 450°C.
Claim 8
Dependent Claim
10 words
A cooking utensil coated by the method of claim 6.
Claim 9
Dependent Claim
39 words
A composition according to claim 4 in which the fluorocarbon polymer is a polytetrafluoroethylene powder of average particle size of less than 20 μm as measured optically prepared by a process including comminution of a high molecular weight polytetrafluoroethylene.
Claim 10
Dependent Claim
9 words
An article coated by the method of claim 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |