Patent US4666642A successfully refreshed from Google Patents.
US4666642A
Expired / Lapsed
US
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Method of forming shaped article from a fluorocarbon polymer composition
Assignee: SEIP Ltd 551 MADISON AVENUE NEW YORK NY 10022 A CORP OF
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Filing: 1985-08-02
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Granted: 1987-05-19
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Expires: 2005-08-02
Abstract
Abstract High strength, flexible compositions with improved mechanical properties at elevated temperatures for wire insulation coatings and other shaped articles used in hostile environments are disclosed, consisting of a high temperature fluorocarbon polymer, such as an ethylene-tetrafluoroethylene copolymer or the like, and from about 1% wt. to about 50% wt. of a polyvinylidene fluoride compound.
Inventors
- 👤 Frank J. Glaister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:22
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/292; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A mthod of forming high strength, shaped articles capable of withstanding high temperatures, the method comprising: (a) preparing a mixture comprising an ethylene-tetrafluoroethylene copolymer and from about 1.0% wt. to about 50% wt. of polyvinylidene fluoride; (b) shaping an article from said mixture by melt-processing; and (c) irradiating said shaped article to crosslink the polymer, said mixture containing no crosslinking agent.
Claim 2
Dependent Claim
61 words
A mthod of forming high strength, shaped articles capable of withstanding high temperatures, the method comprising: (a) preparing a mixture comprising an ethylene-tetrafluoroethylene copolymer and from about 1.0% wt. to about 50% wt. of polyvinylidene fluoride; (b) shaping an article from said mixture by melt-processing; and (c) irradiating said shaped article to crosslink the polymer, said mixture containing no crosslinking agent.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the step of irradiating the article comprises irradiating the article with from about 5 megarads to about 50 megarads or more of radiation.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein the step of irradiating the article comprises irradiating the article with from about 15 megarads to about 25 megarads or more of radiation.
Claim 5
Independent Claim
86 words
A method of forming high strength, shaped articles capable of withstanding high temperatures, the method comprising: (a) preparing a mixture of pellets of crosslinkable ethylene-tetrafluoroethylene and polyvinylidene fluoride; (b) coating said pellets with a liquid radiation crosslinking promoter; (c) coating the resulting promoter-coated pellets with powdered polyvinylidene fluoride; (d) blending the pellets to obtain a mixture comprising 1.0% by weight to 50% by weight of polyvinylidene fluoride; (e) shaping an article from said mixture by melt-processing; and (f) irradiating said shaped article to crosslink the polymer.
Claim 6
Independent Claim
86 words
A method of forming high strength, shaped articles capable of withstanding high temperatures, the method comprising: (a) preparing a mixture of pellets of crosslinkable ethylene-tetrafluoroethylene and polyvinylidene fluoride; (b) coating said pellets with a liquid radiation crosslinking promoter; (c) coating the resulting promoter-coated pellets with powdered polyvinylidene fluoride; (d) blending the pellets to obtain a mixture comprising 1.0% by weight to 50% by weight of polyvinylidene fluoride; (e) shaping an article from said mixture by melt-processing; and (f) irradiating said shaped article to crosslink the polymer.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein said crosslinking promoter is triallyl isocyanurate.
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |