US4155823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped article from crosslinked fluorocarbon polymer and process therefor
Assignee: Raychem Corp
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Filing: 1977-09-14
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Granted: 1979-05-22
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Expires: 1997-09-14
Abstract
Abstract Melt-processable fluorocarbon polymer compositions requiring high temperature processing can be highly crosslinked by exposure to radiation after post-extrusion incorporation of at least one of certain crosslinking agents. These polymer compositions can be crosslinked to exceptionally high levels affording polymeric materials of improved mechanical properties at elevated temperatures, especially when utilized in wire constructions.
Inventors
- 👤 Alan J. Gotcher
- 👤 Paul B. Germeraad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:17
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A process comprising the steps of: (a) forming a shaped article from an addition polymerized fluorocarbon polymer containing at least 10 percent fluoride having a melting point prior to crosslinking of at least 200° said forming being effected at a temperature in excess of the melting point of said polymer, (b) incorporating into said shaped article from about 4.0 to about 20.0 wt. % of a crosslinking agent containing at least 15 molar percent carbon-carbon unsaturation based on the weight of polymer, and (c) crosslinking said shaped article by exposing it to from about 2 to 30 megarads of radiation.
Claim 2
Dependent Claim
100 words
A process comprising the steps of: (a) forming a shaped article from an addition polymerized fluorocarbon polymer containing at least 10 percent fluoride having a melting point prior to crosslinking of at least 200° said forming being effected at a temperature in excess of the melting point of said polymer, (b) incorporating into said shaped article from about 4.0 to about 20.0 wt. % of a crosslinking agent containing at least 15 molar percent carbon-carbon unsaturation based on the weight of polymer, and (c) crosslinking said shaped article by exposing it to from about 2 to 30 megarads of radiation.
Claim 3
Dependent Claim
28 words
A process in accordance with claim 1 wherein said crosslinking agent is incorporated into said shaped article in an amount of from about 4.0 to 12.0 wt. %.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein said crosslinking agent is incorporated in an amount of from about 6.0 to 10.0 wt. %.
Claim 5
Dependent Claim
20 words
A process in accordance with claim 1 wherein said crosslinking agent is triallyl cyanurate, triallyl isocyanurate or a mixture thereof.
Claim 6
Dependent Claim
48 words
A process in accordance with claim 1 wherein said polymer is an ethylene tetrafluoroethylene copolymer or terpolymer containing from about 35 to 60 mole percent ethylene, from about 35 to 60 mole percent tetrafluoroethylene and up to about 10 mole percent of at least one additional copolymerizable comonomer.
Claim 7
Dependent Claim
22 words
A process in accordance with claim 1 wherein said polymer contains from about 0.5 to about 6.0 wt. % of antimony oxide.
Claim 8
Dependent Claim
15 words
A process in accordance with claim 1 wherein steps b and c are repeated sequentially.
Claim 9
Dependent Claim
12 words
A shaped article fabricated in accordance with the process of claim 7.
References Cited (Backward Citations)
US3580829A
Cited
US3846267A
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US3738923A
Cited
US3840619A
Cited
US3947525A
Cited
US3894118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |