US4226970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters derived from diketodiols and aromatic dicarboxylic acids and filaments thereof
Assignee: EIDP Inc
•
Filing: 1979-07-23
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Granted: 1980-10-07
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Expires: 1999-07-23
Abstract
Abstract High modulus filaments are melt-spun from polyesters which are derived from certain substituted aromatic diketodiols and aromatic dicarboxylic acids. 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
- 👤 August H. Frazer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:06
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR14## in substantially equimolar amounts and wherein X is methyl- or chloro- and Ar is m- or p-phenylene with the proviso that when Ar is p-phenylene R 2 is selected from the group consisting of (a) p-phenylene (15-40 mol %) and m-phenylene (60-85 mol %); (b) p-phenylene (0-35 mol %) and ethylenedioxybis-p-phenylene (65-100 mol %); (c) m-phenylene (0-50 mol %) and ethylenedioxybis-p-phenylene (50-100 mol %); and (d) m-phenylene (0-30 mol %) and p,p'-biphenylene (70-100 mol %) and when Ar is m-phenylene, R 2 is selected from the group consisting of (e) p-phenylene (0-35 mol %) and p,p'-biphenylene (65-100 mol %); (f) p-phenylene (0-60 mol %) and ethylenedioxybis-p-phenylene (40-60 mol %); (g) m-phenylene (0-40 mol %) and ethylenedioxybis-p-phenylene (60-100 mol %), and (h) m-phenylene (15-50 mol %) and p,p'-biphenylene (50-85 mol %).
Claim 2
Dependent Claim
142 words
A fiber-forming (co)polyester consisting essentially of units having the structural formulas ##STR14## in substantially equimolar amounts and wherein X is methyl- or chloro- and Ar is m- or p-phenylene with the proviso that when Ar is p-phenylene R 2 is selected from the group consisting of (a) p-phenylene (15-40 mol %) and m-phenylene (60-85 mol %); (b) p-phenylene (0-35 mol %) and ethylenedioxybis-p-phenylene (65-100 mol %); (c) m-phenylene (0-50 mol %) and ethylenedioxybis-p-phenylene (50-100 mol %); and (d) m-phenylene (0-30 mol %) and p,p'-biphenylene (70-100 mol %) and when Ar is m-phenylene, R 2 is selected from the group consisting of (e) p-phenylene (0-35 mol %) and p,p'-biphenylene (65-100 mol %); (f) p-phenylene (0-60 mol %) and ethylenedioxybis-p-phenylene (40-60 mol %); (g) m-phenylene (0-40 mol %) and ethylenedioxybis-p-phenylene (60-100 mol %), and (h) m-phenylene (15-50 mol %) and p,p'-biphenylene (50-85 mol %).
Claim 3
Dependent Claim
22 words
The polyester of claim 1 wherein Ar is p-phenylene and R 2 is p-phenylene (15-40 mol %) and m-phenylene (60-85 mol %).
Claim 4
Dependent Claim
22 words
The polyester of claim 1 wherein Ar is p-phenylene and R 2 is m-phenylene (0-35 mol %) and ethylenedioxybis-p-phenylene (65-100 mol %).
Claim 5
Dependent Claim
22 words
The polyester of claim 1 wherein Ar is p-phenylene and R 2 is m-phenylene (0-50 mol %) and ethylenedioxy-p-biphenylene (50-100 mol %).
Claim 6
Dependent Claim
22 words
The polyester of claim 1 wherein Ar is m-phenylene and R 2 is p-phenylene (0-60 mol %) and p,p'-biphenylene (65-100 mol %).
Claim 7
Dependent Claim
8 words
A filament of the polyester of claim 1.
Claim 8
Dependent Claim
23 words
A heat-treated filament according to claim 6 and having a modulus of greater than 200 g/denier and tenacity in excess of 10 g/denier.
References Cited (Backward Citations)
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Cited
US3729447A
Cited
US3809682A
Cited
US3928295A
Cited
US3979459A
Cited
US4137218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |