US4245082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters derived from 3,4'-dihydroxy-benzophenones or 3-hydroxy-4'-(4-hydroxyphenyl-)benzophenone and certain aromatic dicarboxylic acids and filaments thereof
Assignee: EIDP Inc
•
Filing: 1979-07-09
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Granted: 1981-01-13
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Expires: 1999-07-09
Abstract
Abstract High modulus filaments are melt-spun from polyesters which are derived from 3,4'-dihydroxybenzophenones or 3-hydroxy-4'-(4-hydroxyphenyl-)benzophenone and terephthalic, 2,6-naphthalene dicarboxylic, or bibenzoic acid. The polyesters are optically anisotropic in the melt. As-spun filaments from these polyesters can be heat treated while free from tension to increase their tenacity.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C07; C07C; C07C45/00; C07C45/45; C07C45/46; C07C45/61; C07C45/67
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas-- ##STR21## wherein R 1 in at least 85 mol % of the ##STR22## units is ##STR23## in which X is methyl or chloro and n is 0, 1 or 2 and wherein r 2 in at least 85 mol % of the ##STR24## units is selected from the group consisting of p-phenylene, 2,6-naphthylene and p,p'-biphenylene with the proviso that when n is 1 or 2, R 2 is 2,6-naphthylene or p,p'-bi-phenylene.
Claim 2
Dependent Claim
82 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas-- ##STR21## wherein R 1 in at least 85 mol % of the ##STR22## units is ##STR23## in which X is methyl or chloro and n is 0, 1 or 2 and wherein r 2 in at least 85 mol % of the ##STR24## units is selected from the group consisting of p-phenylene, 2,6-naphthylene and p,p'-biphenylene with the proviso that when n is 1 or 2, R 2 is 2,6-naphthylene or p,p'-bi-phenylene.
Claim 3
Dependent Claim
50 words
The (co)polyester of claim 1 wherein R 1 in up to 15 mol % of the ##STR25## units is selected from the group consisting of m-phenylene, p-phenylene, chloro-p-phenylene, methyl-p-phenylene, p,p'-biphenylene, tetramethyl-p,p'-biphenylene, 2,6-naphthylene and 2,7-naphthylene and wherein R 2 in up to 15 mol % of the ##STR26## units is m-phenylene.
Claim 4
Dependent Claim
10 words
The (co)polyester of claim 1 wherein R 1 is ##STR27##
Claim 5
Dependent Claim
10 words
The (co)polyester of claim 3 wherein R 2 is p-phenylene.
Claim 6
Dependent Claim
10 words
The (co)polyester of claim 3 wherein R 2 is 2,6-naphthylene.
Claim 7
Dependent Claim
10 words
The (co)polyester of claim 1 wherein R 2 is 2,6-naphthylene.
Claim 8
Dependent Claim
10 words
The (co)polyester of claim 1 wherein R 2 is p,p'-biphenylene.
Claim 9
Dependent Claim
8 words
A filament of the (co)polyester of claim 1.
Claim 10
Dependent Claim
28 words
A heat-treated filament according to claim 8 and having a modulus of greater than 200 g/denier (177 dN/tex) and a tenacity in excess of 10 g/denier (8.84 dN/tex).
Claim 11
Dependent Claim
10 words
The (co)polyester of claim 1 wherein R 1 is ##STR28##
Claim 12
Dependent Claim
10 words
The (co)polyester of claim 10 wherein R 2 is p-phenylene.
Claim 13
Dependent Claim
62 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR29## wherein R 1 is ##STR30## in which X is methyl or chloro and n is 0, 1 or 2 and wherein R 2 is selected from the group consisting of p-phenylene, 2,6-naphthylene and p,p'-biphenylene with the proviso that when n is 1 or 2, R 2 is 2,6-naphthylene or p,p'-biphenylene.
Claim 14
Dependent Claim
62 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR29## wherein R 1 is ##STR30## in which X is methyl or chloro and n is 0, 1 or 2 and wherein R 2 is selected from the group consisting of p-phenylene, 2,6-naphthylene and p,p'-biphenylene with the proviso that when n is 1 or 2, R 2 is 2,6-naphthylene or p,p'-biphenylene.
Claim 15
Dependent Claim
62 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR31## wherein R 1 is ##STR32## in which X is methyl or chloro and n is 0, 1 or 2, R 2 is p-phenylene, 2,6-naphthylene or p,p'-biphenylene and R 3 is m- or p-phenylene with unit III constituting up to 15 mol % of the total of units I and III.
Claim 16
Dependent Claim
62 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR31## wherein R 1 is ##STR32## in which X is methyl or chloro and n is 0, 1 or 2, R 2 is p-phenylene, 2,6-naphthylene or p,p'-biphenylene and R 3 is m- or p-phenylene with unit III constituting up to 15 mol % of the total of units I and III.
Claim 17
Dependent Claim
8 words
A filament of the (co)polyester of claim 11.
Claim 18
Dependent Claim
8 words
A filament of the (co)polyester of claim 13.
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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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |