Patent DE601560C successfully refreshed from Google Patents.
Patent US4904726A successfully refreshed from Google Patents.
US4904726A
Expired / Lapsed
US
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Modified polytetrafluoroethylene resins and blends thereof
Assignee: EIDP Inc
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Filing: 1988-12-09
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Granted: 1990-02-27
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Expires: 2008-12-09
Abstract
Abstract Dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene and modifying recurring units of at least one ethylenically unsaturated comonomer that is copolymerizable with the tetrafluoroethylene, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with an elastomer or plastic without forming visible agglomerates, and blends thereof with elastomeric and plastic resins.
Inventors
- 👤 Richard A. Morgan
- 👤 Charles W. Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:09
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08F; C08F214/00; C08F214/18; C08F214/26; C08F259/00; C08F259/08; C08L51/00; C08L51/06; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
Blend of (a) an elastomeric resin, and (b) 0.1 to 200 parts per 100 parts of component (a) of a dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer, the copolymer being present in said resin in the form of platelets distributed throughout the resin and comprising recurring units of tetrafluoroethylene and modifying recurring units of a comonomer selected from the class consisting of hexafluoropropylene, perfluoro(alkyl vinyl ethers), perfluoro(alkyl vinyl ethers) wherein an alkyl group is replaced with a hexafluoropropylene oxide oligomer, chlorotrifluoroethylene, and a mixture thereof, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with said resin without forming visible agglomerates.
Claim 2
Dependent Claim
110 words
Blend of (a) an elastomeric resin, and (b) 0.1 to 200 parts per 100 parts of component (a) of a dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer, the copolymer being present in said resin in the form of platelets distributed throughout the resin and comprising recurring units of tetrafluoroethylene and modifying recurring units of a comonomer selected from the class consisting of hexafluoropropylene, perfluoro(alkyl vinyl ethers), perfluoro(alkyl vinyl ethers) wherein an alkyl group is replaced with a hexafluoropropylene oxide oligomer, chlorotrifluoroethylene, and a mixture thereof, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with said resin without forming visible agglomerates.
Claim 3
Dependent Claim
29 words
The blend of claim 1 wherein component (a) is an elastomeric resin and component (b) is present in an amount of 1-200 parts per 100 parts of elastomeric resin.
Claim 4
Dependent Claim
28 words
The blend of claim 1 wherein the comonomer of the tetrafluoroethylene copolymer is selected from the class consisting of hexafluoropropylene, perfluoro(alkyl vinyl ethers), and a mixture of them.
Claim 5
Dependent Claim
18 words
The blend of claim 3 wherein the alkyl group of the perfluoro(alkyl vinyl ether) contains 1-4 carbon atoms.
Claim 6
Dependent Claim
22 words
The blend of claim 1 wherein the tetrafluoroethylene copolymer is comprised of at least 0.08 weight percent of recurring units of hexafluoropropylene.
Claim 7
Dependent Claim
25 words
The blend of claim 1 wherein the tetrafluoroethylene copolymer is comprised of greater than 0.02 weight percent of recurring units of a perfluoro(alkyl vinyl ether).
Claim 8
Dependent Claim
8 words
The blend of claim 1 containing a filler.
Claim 9
Dependent Claim
9 words
The blend of claim 1 containing a curing agent.
Claim 10
Dependent Claim
5 words
Cured blend of claim 8.
Claim 11
Dependent Claim
12 words
Blend of claim 2 wherein the elastomer is a vinylidene fluoride/hexafluoroproplylene copolymer.
Claim 12
Dependent Claim
12 words
Blend of claim 2 wherein the elastomer is a vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene copolymer.
Claim 13
Dependent Claim
11 words
Blend of claim 2 wherein the elastomer is a fluorosilicone elastomer.
Claim 14
Dependent Claim
11 words
Blend of claim 2 wherein the elastomer is an ethylene/propylene/diene copolymer.
Claim 15
Dependent Claim
10 words
Blend of claim 2 wherein the elastomer is a polychloroprene.
Claim 16
Dependent Claim
11 words
Blend of claim 2 wherein the elastomer is a styrene/butadiene copolymer.
Claim 17
Dependent Claim
13 words
Blend of claim 2 wherein the elastomer is a tetrafluoroethylene/perfluoro(methyl vinyl ether) copolymer.
Claim 18
Dependent Claim
14 words
Blend of claim 2 wherein the elastomer is a tetrafluoroethylene/perfluoro(methyl vinyl ether)/vinylidene fluoride copolymer.
References Cited (Backward Citations)
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |