US4450263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoropolymer gum of vinylidene fluoride, hexafluoropropene, and bromodifluoroethylene
Assignee: Dyneon LLC
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Filing: 1980-08-29
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Granted: 1984-05-22
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Expires: 2000-08-29
Abstract
Abstract A fluoropolymer gum of 60 to 85 mol percent vinylidene fluoride, 10 to 40 mol percent of hexafluoropropene and 0.15 to 3 mol percent 1-bromo-2,2-difluoroethylene is provided which can be blended with fluorosilicone gum and vulcanized in presence of free-radical initiators to produce elastomeric vulcanizates with desired balance of chemical solvent or fluid resistance, high temperature stability, and low temperature flexibility, coupled with good physical properties such as high tensile strength and elongation.
Inventors
- 👤 Arthur C. West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:48
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; C08L83/00; C08L83/04; C08L83/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A fluoropolymer gum whose interpolymerized units consist essentially of 60 to 85 mol percent of units derived from vinylidene fluoride, 10 to 40 mol percent of units derived from hexafluoropropene, and 0.15 to 3 mole percent of units derived from 1-bromo-2,2-difluoroethylene, which gum cures in the presence of free-radical initiators under vulcanization conditions to produce an elastomeric vulcanizate.
Claim 2
Dependent Claim
58 words
A fluoropolymer gum whose interpolymerized units consist essentially of 60 to 85 mol percent of units derived from vinylidene fluoride, 10 to 40 mol percent of units derived from hexafluoropropene, and 0.15 to 3 mole percent of units derived from 1-bromo-2,2-difluoroethylene, which gum cures in the presence of free-radical initiators under vulcanization conditions to produce an elastomeric vulcanizate.
Claim 3
Dependent Claim
46 words
The fluoropolymer gum according to claim 1 wherein said fluoropolymer gum has interpolymerized units consisting of 65 to 82 mol percent units derived from vinylidene fluoride, 17 to 35 mole percent of units derived from hexafluoropropene, and 0.2 to 0.6 mole percent units derived from 1-bromo-2,2-difluoroethylene.
Claim 4
Dependent Claim
43 words
The fluoropolymer gum according to claim 1 wherein said fluoropolymer gum has interpolymerized units consisting of about 78 mol percent units derived from vinylidene fluoride, about 21 mole percent of units derived from hexafluoropropene, and about 0.3 mole percent units derived from 1-bromo-2,2-difluoroethylene.
References Cited (Backward Citations)
US4035565A
Cited
US4214060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |