Self-supported, oriented high-performance films having minimal thermal distortion properties
AssigneeExxon Research & Engineering Co.
InventorsBurnett H. Johnson, Don J. Henderson
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Abstract
Highly unusual and useful novel high-performance, oriented, lowcrystalline, essentially heterocyclic structures, e.g. films, are prepared from certain novel and important process sequences. These structures, e.g. films and fibers, possess a unique combination of minimal shrinkage at high temperatures, after orientation, coupled with negligible coefficent of expansion over an unusually wide temperature range.
Claims9
An oriented shaped article formed from a high softening temperature aromatic-containing polymer or copolymer having a thermal co-efficient of expansion (.alpha.) of from +1.6 to -3.0 .times. 10.sup.-.sup.5 deg .sup.-.sup.1 and for PPA a birefringence value of from 0.05 to 0.2 and wherein said article has been elongated at least 25% more than its non-oriented value in one dimension.
Dependencies are inferred from the claim text.