Thermally stable, rigid polyesters from aromatic dibasic acids and thermally stable, rigid bisphenols
AssigneeE. I. Du Pont de Nemours and Company
InventorAugust Henry Frazer
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Abstract
Thermally stable, rigid bisphenols of the formula ##STR1## WHERE R is ##STR2## or ##STR3## where R.sup.2 is arylene or substituted arylene, and R.sup.1 is hydrogen or acyl, Are used to prepare thermally stable, rigid, ordered polyesters of the formula ##STR4## where R.sup.4 is arylene or substituted arylene, and n is at least about 10.
Claims9
The thermally stable, rigid, ordered polyesters of the formula ##STR50## where R is ##STR51## or ##STR52## where R.sup.2 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.4 is an arylene selected from the group consisting of 1,4-phenylenes, 4,4'-biphenylenes, 4,4'-biphenylene oxides, and 2,6-naphthylenes, said arylene being unsubstituted or substituted with halo, lower alkyl or phenyl, and
- n is at least 10.
Dependencies are inferred from the claim text.