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US3621091A
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Process for insolubilizing a polyphenylene ether fiber
Assignee: General Electric Co
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Filing: 1969-09-08
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Granted: 1971-11-16
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Expires: 1989-09-08
Abstract
Abstract Orienting and heat-treating polyphenylene ether fibers. Conditions include orienting by stretching 3-10X at 200*-300* C. and subsequently treating at 350*-529* C. by relaxing up to 70 percent, heating at constant length or redrawing up to 5X. The processing increases crystallinity, improves tensile properties and results in fiber insolubility in various conventional drycleaning solutions.
Inventors
- 👤 Jerome J Hertz
- 👤 William E Salvadore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:57
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D01; D01F; D01F6/00; D01F6/58; D01F6/66
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The process of claim 1 where Q'' is phenyl and Z is hydrogen.
Claim 2
Dependent Claim
20 words
The process of claim 1 where the oriented fiber is treated at a temperature between 460* C. and 500* C.
Claim 3
Dependent Claim
20 words
The process of claim 1 where the ratio during subsequent treating of the oriented fiber is between 1.0 and 2.5.
Claim 4
Dependent Claim
79 words
A process for insolubilizing a fiber formed from a poly-(2,6-diphenyl-1-1,4-phenylene)ether which is soluble in trichloroethylene comprising orienting said fiber in a stretching operation at a temperature of from 200*to 300* C. at a stretch ratio of between 3.0 and 10.0and thereafter treating the oriented fiber within a temperature range of between about 350* C. and 520* C. while maintaining the fiber under tension the ratio of fiber length under tension to oriented fiber length being from 0.3 to 5.0.
Claim 5
Dependent Claim
28 words
The process of claim 5 where the oriented fiber is treated at a temperature of between 460*and 500* C. and at a ratio of between about 1.0and 2.5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |