US4600765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt processable optically anisotropic polymers
Assignee: Montedison SpA
•
Filing: 1984-02-17
•
Granted: 1986-07-15
•
Expires: 2004-02-17
Abstract
Abstract Melt spinnable, liquid crystal aromatic polyesters which are optically anisotropic in the melt phase are provided.
Inventors
- 👤 David M. Lee
- 👤 David A. Hutchings
- 👤 Gloria M. Sieloff
- 👤 G. Fred Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A melt spinnable liquid crystal polyester which is optically anistropic in the melt phase and of fiber forming molecular weight consisting essentially of recurring moieties of formulas: ##STR4## and II. ##STR5## and moiety III or IV wherein III is ##STR6## wherein the mole ratio of moiety II to moiety III, when present, is 1:4 to 2:1 and wherein the mole ratio of moiety II to moiety IV, when present, is 2:8 to 1:9.
Claim 2
Dependent Claim
73 words
A melt spinnable liquid crystal polyester which is optically anistropic in the melt phase and of fiber forming molecular weight consisting essentially of recurring moieties of formulas: ##STR4## and II. ##STR5## and moiety III or IV wherein III is ##STR6## wherein the mole ratio of moiety II to moiety III, when present, is 1:4 to 2:1 and wherein the mole ratio of moiety II to moiety IV, when present, is 2:8 to 1:9.
Claim 3
Dependent Claim
18 words
The polyester of claim 1 wherein said polyester has a melting point of at least about 300° C.
Claim 4
Dependent Claim
16 words
The polyester of claim 1 wherein said polyester consists essentially of moieties I, II and III.
Claim 5
Dependent Claim
16 words
The polyester of claim 1 wherein said polyester consists essentially of moieties, I, II and IV.
Claim 6
Dependent Claim
11 words
A heat treated fiber formed of the polyester of claim 3.
Claim 7
Dependent Claim
9 words
A film formed of the polyester of claim 3.
Claim 8
Dependent Claim
10 words
A molded article formed of the polyester of claim 3.
Claim 9
Dependent Claim
19 words
The fiber of claim 5 wherein said fiber has a tenacity of at least about 18 grams per denier.
Claim 10
Dependent Claim
37 words
A fiber formed of the composition of claim 3, said fiber exhibiting an increase in tenacity of at least 100% when heated in a nitrogen atmosphere to a temperature of about 302° C. for about 22 hours.
References Cited (Backward Citations)
US3991013A
Cited
US4083829A
Cited
US4159365A
Cited
US4311824A
Cited
US4242496A
Cited
US4284757A
Cited
US4238600A
Cited
US4360658A
Cited
US4447593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |