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US 4,226,970 AGranted
Polyesters derived from diketodiols and aromatic dicarboxylic acids and filaments thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorAugust H. Frazer
Life of this patent
Estimating the term…
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.
Claims7
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.sub.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.sub.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 %).
6 more elements
Dependencies are inferred from the claim text.