Back to results
US 4,380,619 AGranted
Oxy- and thioaryl-phenylated aromatic heterocyclic polymers
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsBruce A. Reinhardt, Fred E. Arnold
Life of this patent
Estimating the term…
Abstract
Oxy- and thio-aryl-phenylated aromatic heterocyclic polymers having the general formula ##STR1## wherein Ar is a monovalent aromatic radical containing an oxy- or thio-linkage, Ar' is a divalent aromatic radical, R is a monovalent aromatic radical, Z is a divalent heterocyclic radical and n is an integer equal to the number of repeating units, are prepared from biscyclopentadienones with diethynyl heterocyclic compounds.
Claims13
A polymer consisting essentially of recurring units having the following formula:
- ##STR20## wherein Ar is a monovalent aromatic group containing an oxy or thio linkage, Ar' is a divalent aromatic group, R is a monovalent aromatic group, and Z is a divalent heterocyclic radical selected from the group consisting of ##STR21## and wherein n is an integer having a value such that the polymer has an intrinsic viscosity in the approximate range of 0.25 to 0.75 as measured in N,N-dimethylacetamide at 30.degree. C.
Dependencies are inferred from the claim text.