US4159365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphenyl-1,4-phenylene terephthalates and fibers therefrom
Assignee: EIDP Inc
•
Filing: 1977-10-05
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Granted: 1979-06-26
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Expires: 1997-10-05
Abstract
Abstract This invention relates to novel fiber-forming polyesters which in fiber form have high tenacity and high retention of tensile strength at elevated temperatures and to methods for making such polyesters. Fiber preparation and heat treatment are also disclosed.
Inventors
- 👤 Charles R. Payet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:37
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
37 words
A melt spinnable polyester of fiber-forming molecular-weight consisting essentially of recurring units of the formulas ##STR4## and of from 0 to 10 mol % based on total mols of units of other aromatic or cycloaliphatic polyester-forming units.
Claim 2
Dependent Claim
37 words
A melt spinnable polyester of fiber-forming molecular-weight consisting essentially of recurring units of the formulas ##STR4## and of from 0 to 10 mol % based on total mols of units of other aromatic or cycloaliphatic polyester-forming units.
Claim 3
Dependent Claim
14 words
A polyester of claim 1 consisting essentially of recurring units of the formulas ##STR5##
Claim 4
Dependent Claim
15 words
A polyester according to claim 1 wherein the other aromatic polyester forming unit is ##STR6##
Claim 5
Dependent Claim
9 words
A shaped article of the polyester of claim 1.
Claim 6
Dependent Claim
13 words
A shaped article according to claim 4 in the form of a fiber.
Claim 7
Dependent Claim
13 words
A shaped article according to claim 4 in the form of a film.
Claim 8
Dependent Claim
15 words
A shaped article according to claim 4 in the form of an injection molded bar.
Claim 9
Dependent Claim
32 words
A heat treated fiber of the polyester of claim 2 having a tenacity of at least 18 grams per denier and at least a 65% retention of tensile tenacity at 150° C.
Claim 10
Dependent Claim
17 words
The fiber of claim 8 having at least a 70% retention of tensile tenacity at 150° C.
Claim 11
Dependent Claim
32 words
A heat-treated fiber of a polyester according to claim 1 having a tenacity of at least 18 grams per denier and at least a 65% retention of tensile tenacity at 150° C.
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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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |