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US 4,606,875 AGranted
Process for preparing shaped articles of rigid rod heterocyclic liquid crystalline polymers
AssigneeCelanese Corporation
InventorsEdward C. Chenevey, Thaddeus E. Helminiak
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Abstract
Shaped articles are prepared from rigid rod heterocyclic liquid crystalline polymers. The articles are prepared by polymerizing the polymer in a reaction medium whereby a solution of the polymer is formed and by forming the articles directly from the polymer solution.
Claims15
A process for preparing shaped articles of a rigid rod heterocyclic liquid crystalline polymer comprising:
- (a) forming a reaction mixture comprising reactants for the formation of a polymer selected from the group consisting of poly [benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene, its cis isomer, poly(p-phenylene benzobisimidazole), poly(p-phenylene benzobisoxazole), its trans isomer and mixtures thereof and a reaction medium selected from the group consisting of polyphosphoric acid, dehydrating phosphate acids, and mixtures thereof;
- (b) polymerizing the reactants in the reaction mixture whereby a solution of said polymer is formed;
- and
- (c) forming shaped articles directly from the polymer solution.
1 more element
Dependencies are inferred from the claim text.