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US4520170A
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Method for reinforcing perfluoroelastomer compositions
Assignee: EIDP Inc
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Filing: 1982-09-20
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Granted: 1985-05-28
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Expires: 2002-09-20
Abstract
Abstract Fiber reinforced perfluoroelastomer parts having high multidirectional tear strength are prepared by blending the fiber with the elastomer, pulverizing the blend into a powder, and molding and press-curing the powder into the desired shape.
Inventors
- 👤 David P. Kitto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:15
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; B; B29; B29C; B29C43/00; B29C43/003; B29K; B29K2027/00; B29K2027/12; B29K2105/00; B29K2105/06; B29K2105/12; B29K2227/00; B29K2227/12; B29L; B29L2031/00; B29L2031/26; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A method for the preparation of perfluoroelastomer parts having high multidirectional tear strength comprising: (a) preparing a blend of the perfluoroelastomer with 1 to 40 parts of fibrillated polytetrafluoroethylene, (b) cryogenically pulverizing the blend produced from step (a) into a powder, (c) placing the powder produced from step (b) into a mold and press-curing the powder into the desired shape for the perfluoroelastomer part.
Claim 2
Independent Claim
64 words
A method for the preparation of perfluoroelastomer parts having high multidirectional tear strength comprising: (a) preparing a blend of the perfluoroelastomer with 1 to 40 parts of fibrillated polytetrafluoroethylene, (b) cryogenically pulverizing the blend produced from step (a) into a powder, (c) placing the powder produced from step (b) into a mold and press-curing the powder into the desired shape for the perfluoroelastomer part.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein the perfluoroelastomer is a terpolymer of tetrafluoroethylene, perfluoro(methyl vinyl ether) and a third monomer selected from the group consisting of: (a) perfluoro(4-cyanobutyl vinyl ether), (b) perfluoro(4-carbomethoxybutyl vinyl ether), (c) perfluoro(2-phenoxypropyl vinyl ether), (d) perfluoro(3-phenoxypropyl vinyl ether), (e) perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene), and (f) a bromo-containing olefin.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the powder produced in pulverization step (b) has substantially all of its particles less than 10 mesh in size.
Claim 5
Dependent Claim
13 words
The method of claim 2 wherein the third monomer is perfluoro(2-phenoxypropyl vinyl ether).
Claim 6
Dependent Claim
11 words
The method of claim 2 wherein the third monomer is perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 7
Dependent Claim
28 words
The method of claim 2 wherein tetrafluoroethylene units comprise 53-79.8 mole percent of the perfluoroelastomer and the perfluoro(methyl vinyl ether) units comprise 20-45 mole percent of the perfluoroelastomer.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein the perfluoroelastomer part produced from step (c) is post cured.
Claim 9
Dependent Claim
10 words
A perfluoroelastomer part produced by the method of claim 1.
Claim 10
Dependent Claim
14 words
A perfluoroelastomer part of claim 7 which is in the shape of a diaphragm.
Claim 11
Dependent Claim
29 words
A perfluoroelastomer diaphragm of claim 9 which has a tear strength as measured by ASTM test D-624-B in both an initial and perpendicular direction of at least 36 kN/m.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |