Patent US4447592A successfully refreshed from Google Patents.
US4447592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anisotropic melt polyesters of 6-hydroxy-2-naphthoic acid
Assignee: EIDP Inc
•
Filing: 1983-06-13
•
Granted: 1984-05-08
•
Expires: 2003-06-13
Abstract
Abstract Melt-processible polyester which is optically anisotropic in the melt phase and which consists essentially of the following molar amounts of the recurring units, with the sum of the molar amounts being 100%: (a) about 20 to about 85%, of ##STR1## (b) about 15 to about 80% of approximately equimolar amounts of ##STR2## wherein each of X 1 , X 2 , X 3 , and X 4 is independently selected from H, Cl, and CH 3 ; Ar is selected from 1,4-phenylene, 1,3-phenylene, 4,4'-oxybiphenylene, 4,4'-biphenylene, and 2,6-naphthylene; Ar 1 is selected from ##STR3## and n is 0 or 1.
Inventors
- 👤 John F. Harris, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:16
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/68; C08G63/682
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
Melt-processible polyester which is optically anisotropic in the melt phase and which consists essentially of the following molar amounts of the recurring units, with the sum of the molar amounts being 100%: (a) about 20 to about 85%, of ##STR21## (b) about 15 to about 80% of approximately equimolar amounts of ##STR22## wherein each of X 1 , X 2 , X 3 , and X 4 is independently selected from H, Cl, and CH 3 ; Ar is selected from 1,4-phenylene, 1,3-phenylene, 4,4'-oxybiphenylene, 4,4'-biphenylene, and 2,6-naphthylene; Ar 1 is selected from ##STR23## and n is 0 or 1.
Claim 2
Dependent Claim
99 words
Melt-processible polyester which is optically anisotropic in the melt phase and which consists essentially of the following molar amounts of the recurring units, with the sum of the molar amounts being 100%: (a) about 20 to about 85%, of ##STR21## (b) about 15 to about 80% of approximately equimolar amounts of ##STR22## wherein each of X 1 , X 2 , X 3 , and X 4 is independently selected from H, Cl, and CH 3 ; Ar is selected from 1,4-phenylene, 1,3-phenylene, 4,4'-oxybiphenylene, 4,4'-biphenylene, and 2,6-naphthylene; Ar 1 is selected from ##STR23## and n is 0 or 1.
Claim 3
Dependent Claim
22 words
Polyester of claim 1 wherein the amount of (a) is 30 to 75% and the amount of (b) is 25 to 70%.
Claim 4
Dependent Claim
22 words
Polyester of claim 1 wherein the amount of (a) is 40 to 70% and the amount of (b) is 30 to 60%.
Claim 5
Dependent Claim
10 words
Polyester of claim 1 wherein repeat unit (i) is ##STR24##
Claim 6
Dependent Claim
8 words
Polyester of claim 4 wherein n is 0.
Claim 7
Dependent Claim
23 words
Polyester of claim 5 wherein at least one of X 1 , X 2 , X 3 , and X 4 is Cl.
Claim 8
Dependent Claim
17 words
Polyester of claim 5 wherein X 1 and X 2 are H and Ar 1 is 1,3-phenylene.
Claim 9
Dependent Claim
22 words
Polyester of claim 4 wherein the amount of (a) is 30 to 75% and the amount of (b) is 25 to 70%.
Claim 10
Dependent Claim
22 words
Polyester of claim 4 wherein the amount of (a) is 40 to 70% and the amount of (b) is 30 to 60%.
Claim 11
Dependent Claim
8 words
Spun article of the polyester of claim 1.
Claim 12
Dependent Claim
11 words
Spun article of claim 10 in the form of a filament.
Claim 13
Dependent Claim
6 words
Heat treated filament of claim 11.
Claim 14
Dependent Claim
8 words
Molded article of the polyester of claim 1.
References Cited (Backward Citations)
US4219461A
Cited
US4256624A
Cited
US4245082A
Cited
US4226970A
Cited
US4276226A
Cited
US4232143A
Cited
US4269965A
Cited
US4318842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |