Patent US4421878A successfully refreshed from Google Patents.
US4421878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroelastomer film compositions and solutions containing epoxy resin adducts
Assignee: David Hudson Inc
•
Filing: 1981-11-25
•
Granted: 1983-12-20
•
Expires: 2001-11-25
Abstract
Abstract The invention herein disclosed provides a method for preparing improved 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 an amine-derived curative to the gum solution and curing the fluoroelastomer gum with the curative in the absence of metallic oxides. 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 an amine-derived curative to the gum solution, coating the substrate with the fluoroelastomer gum-curative solution and evaporating the solvent leaving a film firmly adhered to the substrate. When metallic oxides are present, the foregoing method can also be practiced by including the step of adding an epoxy resin to the composition. 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
2026-10-30 22:07
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L63/00; C08L77/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
An improved cured fluoroelastomer film composition consisting essentially of: a fluoroelastomer gum; and a curative selected from the group consisting of polyamine and polyamide adducts of epoxy resins and blends of fatty amidoamine resins and polyamide adducts of epoxy resins, the improvement wherein said film composition is devoid of metal oxides.
Claim 2
Dependent Claim
51 words
An improved cured fluoroelastomer film composition consisting essentially of: a fluoroelastomer gum; and a curative selected from the group consisting of polyamine and polyamide adducts of epoxy resins and blends of fatty amidoamine resins and polyamide adducts of epoxy resins, the improvement wherein said film composition is devoid of metal oxides.
Claim 3
Dependent Claim
41 words
An improved cured fluoroelastomer film composition, as set forth in claim 1, wherein said curative comprises polyamine and polyamide adducts of epoxy resins and is employed in an amount of from about 0.1 to 10 parts per 100 parts of rubber.
Claim 4
Dependent Claim
45 words
An improved cured fluoroelastomer film composition, as set forth in claim 1, wherein said curative comprises blends of fatty amidoamine resins and polyamide adducts of epoxy resins and is employed in an amount of from about 0.5 to 20 parts per 100 parts of rubber.
Claim 5
Dependent Claim
58 words
An improved fluoroelastomer solution consisting essentially: a fluoroelastomer gum; a curative selected from the group consisting of polyamine and polyamide adducts of epoxy resins and blends of fatty amidoamine resins and polyamide adducts of epoxy resins; and a solvent for said gum and said curative the improvement wherein said fluoroelastomer is cured in the absence of metal oxides.
Claim 6
Dependent Claim
58 words
An improved fluoroelastomer solution consisting essentially: a fluoroelastomer gum; a curative selected from the group consisting of polyamine and polyamide adducts of epoxy resins and blends of fatty amidoamine resins and polyamide adducts of epoxy resins; and a solvent for said gum and said curative the improvement wherein said fluoroelastomer is cured in the absence of metal oxides.
Claim 7
Dependent Claim
39 words
An improved fluoroelastomer solution, as set forth in claim 4, wherein said curative comprises polyamine and polyamide adducts of epoxy resins and is employed in an amount of from about 0.1 to 10 parts per 100 parts of rubber.
Claim 8
Dependent Claim
43 words
An improved fluoroelastomer solution, as set forth in claim 4, wherein said curative comprises blends of fatty amidoamine resins and polyamide adducts of epoxy resins and is employed in an amount of from about 0.5 to 20 parts per 100 parts of rubber.
Claim 9
Dependent Claim
26 words
An improved fluoroelastomer solution, as set forth in claim 4, wherein the amount of fluoroelastomer and curative solids comprises up to about 20 percent by weight.
Claim 10
Dependent Claim
33 words
An improved fluoroelastomer solution, as set forth in claim 1, wherein said composition further contains an epoxy resin in an amount of from about 1 to 100 parts per 100 parts of fluoroelastomer.
Claim 11
Dependent Claim
37 words
An improved cured fluoroelastomer film composition, as set forth in claim 1, wherein said fluoroelastomer gum is selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene.
Claim 12
Dependent Claim
37 words
An improved cured fluoroelastomer film composition, as set forth in claim 4, wherein said fluoroelastomer gum is selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene.
References Cited (Backward Citations)
US2793200A
Cited
US3029227A
Cited
US2979490A
Cited
US2979418A
Cited
US2968649A
Cited
US3041316A
Cited
US3039992A
Cited
US3340222A
Cited
GB1228438A
Cited
US3674763A
Cited
US4143204A
Cited
US3784506A
Cited
US3884877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |