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US 4,065,431 AGranted
Thermally stable, rigid polyesters from aromatic dibasic acids and thermally stable, rigid diols
AssigneeE. I. Du Pont de Nemours and Company
InventorAugust Henry Frazer
Life of this patent
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Abstract
Rigid polyesters of the formula ##STR1## WHERE R and R.sup.1 are each arylene or substituted arylene and n is at least about 10 have a combination of being thermally stable and melt spinnable.
Claims9
The thermally stable, rigid polyesters of the formula ##STR26##
- where R is an arylene selected from the group consisting of 1. 4-phenylenes, 4,4'-biphenylenes and 2,6-naphthylenes, said arylene being unsubstituted or substituted with halo, lower alkyl or phenyl,
- R.sup.1 is an arylene selected from the group consisting of 1,4-phenylenes, 4,4'-biphenylenes, 4,4'-biphenyleneoxides, and 2,6-naphthylenes, said arylene being unsubstituted or substituted with halo, lower alkyl or phenyl;
- and
- n is at least 10.
1 more element
Dependencies are inferred from the claim text.