Polymers from phenylterephthalic acid
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn F. Harris, Jr.
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Abstract
Melt-spinnable, anisotropic melt-forming aromatic polyesters prepared from phenylterephthalic acid or mixtures thereof with terephthalic acid, one or more selected aromatic diols, and 4-hydroxybenzoic acid; and filaments of such polyesters, the tenacity of which filaments can be increased by heat treatment.
Claims9
Fiber forming melt-spinnable polyester that is optically anisotropic in the melt and consists essentially of recurring units having the structural formulas ##STR7## or a combination of (a) and up to 50 mole percent of ##STR8## wherein R.sup.1 is 1,4-phenylene, 2,6-naphthylene, 4,4'-biphenylene, or a mixture of any thereof;
- (2) (a) --O--R.sup.2 --O--
- wherein R.sup.2 is 1,4-phenylene, monochloro-, monophenyl-, or monoalkyl-1,4-phenylene wherein alkyl contains 1 to 4 carbon atoms, 2,6-naphthylene, 1,4-naphthylene, 4,4'-biphenylene or a mixture of any thereof, or a combination of (a) and up to 20 mole percent of ##STR9## and (3) based on the total moles of (1) and (3), 25 to 80 mole percent of ##STR10## the recurring diacid units (1) and recurring dioxy units (2) being present in substantially equimolar amounts.
Dependencies are inferred from the claim text.