US4098776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(arylene sulfide) fibers
Assignee: Phillips Petroleum Co
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Filing: 1976-05-28
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Granted: 1978-07-04
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Expires: 1996-05-28
Abstract
Abstract Tenacity and boiling water shrinkage of poly(arylene sulfide) fibers are improved by a heat treatment at temperatures of at least about 100° C (212° F) but below the temperature at which fibers begin to stick to each other, for a time period sufficient to attain desired tenacity or boiling water shrinkage.
Inventors
- 👤 Dale O. Tieszen
- 👤 Oren L. Marrs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:14
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/01; D06M11/05; D01; D01F; D01F6/00; D01F6/58; D01F6/76; D01F6/765
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A method for improving tenacity and boiling water shrinkage of poly(arylene sulfide) fibers and articles made therefrom which comprises: subjecting spun poly(arylene sulfide) fibers or articles to temperatures of at least about 100° C. (212° F.), but less than the temperature at which fibers stick to each other, for a time period sufficient to increase the tenacity and decrease the boiling water shrinkage.
Claim 2
Independent Claim
63 words
A method for improving tenacity and boiling water shrinkage of poly(arylene sulfide) fibers and articles made therefrom which comprises: subjecting spun poly(arylene sulfide) fibers or articles to temperatures of at least about 100° C. (212° F.), but less than the temperature at which fibers stick to each other, for a time period sufficient to increase the tenacity and decrease the boiling water shrinkage.
Claim 3
Dependent Claim
56 words
A method of claim 1 wherein the boiling water shrinkage is decreased to below about 1% by subjecting spun fibers or articles to a temperature greater than 100° C. (212° F.), but less than the temperature at which fibers stick to each other, in an oxidizing atmosphere for a time period sufficient to achieve said improvement.
Claim 4
Dependent Claim
26 words
A method of claim 2 wherein spun fibers are subjected to a temperature of at least about 125° C. (257° F.) for at least one hour.
Claim 5
Dependent Claim
46 words
A method of claim 2 wherein spun fibers are subjected to a temperature in the range of from about 125° C. (257° F.) to about 200° C. (392° F.) for a period of time ranging from about 1 hour to about 1/4 of an hour, respectively.
Claim 6
Dependent Claim
13 words
A method of claim 1 wherein said poly(arylene sulfide) fibers are poly(phenylene sulfide).
Claim 7
Dependent Claim
25 words
A method of claim 2 wherein said poly(arylene sulfide) fibers are poly(phenylene sulfide) and the heat treatment is carried out in the presence of air.
Claim 8
Dependent Claim
25 words
A method of claim 3 wherein said poly(arylene sulfide) fibers are poly(phenylene sulfide) and the heat treatment is carried out in the presence of air.
Claim 9
Dependent Claim
25 words
A method of claim 4 wherein said poly(arylene sulfide) fibers are poly(phenylene sulfide) and the heat treatment is carried out in the presence of air.
Claim 10
Dependent Claim
19 words
An article of manufacture comprising a yarn or fabric formed of melt-spun poly(arylene sulfide) treated as in claim 1.
Claim 11
Dependent Claim
14 words
An article of manufacture claimed in claim 9 wherein poly(arylene sulfide) is poly(phenylene sulfide).
Claim 12
Dependent Claim
52 words
An article of manufacture claimed in claim 10 wherein the boiling water shrinkage thereof is below about 1% following a heat treatment at temperatures ranging from about 125° C. (257° F.) to about 200° C. (392° F.) for a time period from about 1 hour to about 1/4 of an hour, respectively.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |