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US 4,066,620 AGranted
Copolyester capable of forming anisotropic melt and shaped articles thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorsJacob John Kleinschuster, Terry Carl Pletcher
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Abstract
This invention relates to a class of novel copolyesters derived from terephthalic acid and derivatives of methyl- or chlorohydroquinone and bis(4-hydroxyphenyl)ether, 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 fibers can be prepared.
Claims13
A fiber-forming melt-spinnable copolyester capable of forming an anisotropic melt consisting essentially of units of the formula:
- ##STR2## wherein X is selected from the group of chloro and methyl;
- m is 1 or 2;
- Y is methyl;
- n is 0 or 1;
- the mol ratio of formula I units to formula II units is within the range of from about 85/15 to 60/40.
2 more elements
Dependencies are inferred from the claim text.