US4381389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically anisotropic melt forming copolyesters
Assignee: EIDP Inc
•
Filing: 1982-07-15
•
Granted: 1983-04-26
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Expires: 2002-07-15
Abstract
Abstract Copolyesters useful for fibers having high elongation and modulus contain minor amounts of ##STR1## units where Y is oxygen or carbonyl.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A copolyester consisting essentially of (a) Units I, II, III and IV or (b) Units I, II and III, said units having the structural formulas: ##STR3## where x is selected from the group consisting of hydrogen, halo-, lower alkyl, and aryl, Y is selected from the group consisting of oxygen and carbonyl and wherein said copolyesters consisting essentially of Units I, II, III and IV contain from about 10 to 15 mole % of Unit I, from about 10 to 20 mole % of Unit II, from about 10 to 15 mole % of Unit III and from about 50 to 70 mole % of Unit IV; and wherein said copolyesters consisting essentially of Units I, II and III contain from about 40 to 45 mole % of Unit I, from about 40 to 50 mole % of Unit II and from about 10 to 15 mole % of Unit III.
Claim 2
Dependent Claim
151 words
A copolyester consisting essentially of (a) Units I, II, III and IV or (b) Units I, II and III, said units having the structural formulas: ##STR3## where x is selected from the group consisting of hydrogen, halo-, lower alkyl, and aryl, Y is selected from the group consisting of oxygen and carbonyl and wherein said copolyesters consisting essentially of Units I, II, III and IV contain from about 10 to 15 mole % of Unit I, from about 10 to 20 mole % of Unit II, from about 10 to 15 mole % of Unit III and from about 50 to 70 mole % of Unit IV; and wherein said copolyesters consisting essentially of Units I, II and III contain from about 40 to 45 mole % of Unit I, from about 40 to 50 mole % of Unit II and from about 10 to 15 mole % of Unit III.
Claim 3
Dependent Claim
22 words
A copolyester according to claim 1 consisting essentially of Units I, II, III and IV where Unit I is 1,4-dioxyphenylene or chloro-1,4-dioxyphenylene.
Claim 4
Dependent Claim
21 words
A copolyester according to claim 1 consisting essentially of Units I, II and III where Unit I is chloro- or phenyl-1,4-dioxyphenylene.
Claim 5
Dependent Claim
13 words
A copolyester according to claim 1 where in Unit III, Y is oxygen.
Claim 6
Dependent Claim
13 words
A copolyester according to claim 1 where in Unit III, Y is carbonyl.
Claim 7
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 8
Dependent Claim
23 words
A heat-treated fiber of claim 6 having an elongation at break of at least 9% and a modulus of at least 140 dN/tex.
Claim 9
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 10
Dependent Claim
11 words
A molded or extruded article of the copolyester of claim 1.
References Cited (Backward Citations)
US4188476A
Cited
US4226970A
Cited
US4232143A
Cited
US4232144A
Cited
US4269965A
Cited
US4335232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |