US3991013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters of derivatives of hydroquinone
Assignee: EIDP Inc
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Filing: 1975-07-16
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Granted: 1976-11-09
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Expires: 1995-07-16
Abstract
Abstract This invention relates to a class of novel copolyesters derived from derivatives of hydroquinone and a mixture of ethylenedioxy-4,4'-dibenzoic acid with terephthalic, bibenzoic, hexahydroterephthalic acids or 2,6-naphthalenedicarboxylic acid and to the fibers and other shaped articles prepared therefrom. Also comprehended by this invention are the novel, optically anisotropic copolyester melts from which these shaped articles can be prepared.
Inventors
- 👤 Terry Carl Pletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:53
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A fiber-forming melt spinnable copolyester capable of forming an anisotropic melt and consisting essentially of units of the formula: ##SPC3## wherein X represents a member selected from the group consisting of chloro-, bromo-, methyl- and dimethyl-1,4-phenylene radicals; up to 80 mol % of formula I units may be replaced with ##SPC4## units; Y is selected from the group of 1,4-phenylene, 1,4-cyclohexylene, 4,4'-biphenylene, and 2,6-naphthylene radicals; and the mol ratio of formula II to formula III units is from 1:4 to 4:1.
Claim 2
Dependent Claim
81 words
A fiber-forming melt spinnable copolyester capable of forming an anisotropic melt and consisting essentially of units of the formula: ##SPC3## wherein X represents a member selected from the group consisting of chloro-, bromo-, methyl- and dimethyl-1,4-phenylene radicals; up to 80 mol % of formula I units may be replaced with ##SPC4## units; Y is selected from the group of 1,4-phenylene, 1,4-cyclohexylene, 4,4'-biphenylene, and 2,6-naphthylene radicals; and the mol ratio of formula II to formula III units is from 1:4 to 4:1.
Claim 3
Dependent Claim
6 words
Poly(chloro-1,4-phenylene ethylenedioxy-4,4'-dibenzoate/terephthalate)(30/70) according to claim 1.
Claim 4
Dependent Claim
9 words
An anisotropic melt of the copolyester of claim 1.
Claim 5
Dependent Claim
9 words
A shaped article of the copolyester of claim 1.
Claim 6
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 7
Dependent Claim
35 words
An as-spun fiber of the copolyester of claim 1 having a tenacity of at least 2 gpd, an initial modulus in excess of 200 gpd and an X-ray orientation angle of less than about 25°.
Claim 8
Dependent Claim
6 words
Copoly(chloro-1,4-phenylene ethylenedioxy-4,4'-dibenzoate/4,4'-bibenzoate)(50/50) according to claim 1.
Claim 9
Dependent Claim
6 words
Copoly(1,4-phenylene/chloro-1,4-phenylene ethylenedioxy-4,4'-dibenzoate/terephthalate)(50/50-50/50) according to claim 1.
Claim 10
Dependent Claim
6 words
Copoly(chloro-1,4-phenylene ethylenedioxy-4,4'-dibenzoate/hexahydroterephthalate)(50/50) according to claim 1.
Claim 11
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 12
Dependent Claim
13 words
The polymer of claim 1 wherein X is chloro-1,4-phenylene and Y is 1,4-phenylene.
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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |