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US4347268A
Expired / Lapsed
US
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Novel fluoroelastomer film compositions containing vinyl copolymers and method for the preparation thereof
Assignee: David Hudson Inc
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Filing: 1980-08-18
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Granted: 1982-08-31
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Expires: 2000-08-18
Abstract
Abstract The invention herein disclosed provides a method for preparing fluoroelastomer film compositions including the steps of dissolving a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent, adding a vinyl copolymer to the gum solution, evaporating the solvent and leaving a film. A method is also provided for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates which includes the steps of dissolving the fluoroelastomer gum in a solvent, adding a vinyl copolymer to the gum solution, coating the substrate with the fluoroelastomer gum-vinyl copolymer solution, evaporating the solvent and leaving a cured film firmly adhered to the substrate. The fluoroelastomer film compositions disclosed herein are also novel and can be used to coat a variety of substrates thereby providing other novel, useful articles.
Inventors
- 👤 Donald Close
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C08J3/005; C08J2327/00; C08J2327/02; C08J2327/12; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
An improved method for preparing fluoroelastomer solutions which can be employed to coat various substrates comprising the steps of: dissolving a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent; and adding a vinyl copolymer selected from the group consisting of vinyl chloride-vinyl acetate copolymer resins, acid modified resins thereof and hydroxyl modified resins thereof to said gum solution; the improvement wherein said fluoroelastomer gum and vinyl copolymer solution is devoid of metallic oxides in order to improve adhesion between coatings formed therefrom and various substrates.
Claim 2
Dependent Claim
102 words
An improved method for preparing fluoroelastomer solutions which can be employed to coat various substrates comprising the steps of: dissolving a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent; and adding a vinyl copolymer selected from the group consisting of vinyl chloride-vinyl acetate copolymer resins, acid modified resins thereof and hydroxyl modified resins thereof to said gum solution; the improvement wherein said fluoroelastomer gum and vinyl copolymer solution is devoid of metallic oxides in order to improve adhesion between coatings formed therefrom and various substrates.
Claim 3
Independent Claim
111 words
A method for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates comprising the steps of: coating the substrate with a fluoroelastomer solution consisting essentially of: from about one to five parts by weight of a vinyl copolymer selected from the group consisting of vinyl chloride-vinyl acetate copolymer resins, acid modified resins thereof and hydroxyl modified resins thereof in a solvent and, from about five to 95 parts by weight of a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent and evaporating said solvent and leaving a film firmly adhered to the substrate.
Claim 4
Independent Claim
111 words
A method for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates comprising the steps of: coating the substrate with a fluoroelastomer solution consisting essentially of: from about one to five parts by weight of a vinyl copolymer selected from the group consisting of vinyl chloride-vinyl acetate copolymer resins, acid modified resins thereof and hydroxyl modified resins thereof in a solvent and, from about five to 95 parts by weight of a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent and evaporating said solvent and leaving a film firmly adhered to the substrate.
Claim 5
Dependent Claim
29 words
A method, as set forth in claim 1, wherein the amount of vinyl copolymer employed ranges from about one to five parts by weight per 100 parts of rubber.
Claim 6
Dependent Claim
33 words
A method, as set forth in claim 1 or 2, including the additional step of baking the film at a temperature of at least 100° C. after the step of evaporating said solvent.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |