US3859259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanizable fluoroelastomer
Assignee: EIDP Inc
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Filing: 1973-08-22
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Granted: 1975-01-07
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Expires: 1993-08-22
Abstract
Abstract A vulcanizable fluorelastomer having advantages over known fluoroelastomers for many applications can be prepared by copolymerizing A. about 50-65 mole percent of tetrafluoroethylene, B. about 5-26 mole percent of vinylidene fluoride and C. about 20-45 mole percent of at least one olefin component selected from the group: (1) propylene, (2) butene-1, (3) a mixture of about 0.1-50 mole percent of ethylene or isobutylene and about 50-99.9 mole percent of propylene or butene-1, and (4) a mixture of about 50 mole percent of ethylene and 50 mole percent of isobutylene.
Inventors
- 👤 Jerald Rice Harrell
- 👤 Walter Werner Schmiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:08
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/265; C08F8/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A VULCANIZABLE FLUOROELASTOMER WHICH IS A COPOLYMER CONTAINING INTERPOLYMERIZED UNITS IN AN AMOUNT EQUAL TO A. ABOUT 50-65 MOLE PERCENT OF TETRAFLUOROETHYLENE, B. ABOUT 5-26 MOLE PERCENT OF VINYLIDENE FLUORIDE AND C. ABOUT 20-45 MOLE PERCENT OF AT LEAST ONE OLEFIN COMPONENT SELECTED FROM THE GROUP: (1) PROPYLENE, (2) BUTENE1, (3) A MIXTURE OF ABOUT 0.1-50 MOLE PERCENT OF ETHYLENE OR ISOBUTYLENE AND ABOUT 50-99.9 MOLE PERCENT OF PROPYLENE OR BUTENE-1, AND (4) A MIXTURE OF ABOUT 50 MOLE PERCENT OF ETHYLENE AND 50 MOLE PERCENT OF ISOBUTYLENE.
Claim 2
Dependent Claim
88 words
A VULCANIZABLE FLUOROELASTOMER WHICH IS A COPOLYMER CONTAINING INTERPOLYMERIZED UNITS IN AN AMOUNT EQUAL TO A. ABOUT 50-65 MOLE PERCENT OF TETRAFLUOROETHYLENE, B. ABOUT 5-26 MOLE PERCENT OF VINYLIDENE FLUORIDE AND C. ABOUT 20-45 MOLE PERCENT OF AT LEAST ONE OLEFIN COMPONENT SELECTED FROM THE GROUP: (1) PROPYLENE, (2) BUTENE1, (3) A MIXTURE OF ABOUT 0.1-50 MOLE PERCENT OF ETHYLENE OR ISOBUTYLENE AND ABOUT 50-99.9 MOLE PERCENT OF PROPYLENE OR BUTENE-1, AND (4) A MIXTURE OF ABOUT 50 MOLE PERCENT OF ETHYLENE AND 50 MOLE PERCENT OF ISOBUTYLENE.
Claim 3
Dependent Claim
17 words
A fluoroelastomer according to claim 1 wherein the amount of vinylidene fluoride is about 10-26 mole percent.
Claim 4
Dependent Claim
14 words
heating the resulting mixture until the fluoroelastomer has undergone the desired amount of crosslinking.
Claim 5
Dependent Claim
14 words
heating the resulting mixture until the fluoroelastomer has undergone the desired amount of crosslinking.
Claim 6
Dependent Claim
9 words
A crosslinked fluoroelastomer obtained by a process which comprises
Claim 7
Dependent Claim
9 words
A crosslinked fluoroelastomer obtained by a process which comprises
Claim 8
Dependent Claim
23 words
As a novel composition useful for preparing a crosslinked fluoroelastomer, a mixture of components (a), (b), and (c) as defined in claim 3.
References Cited (Backward Citations)
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US3401155A
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US3449305A
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US3451978A
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US3579474A
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US3723387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |