Process for the production of biaxially oriented rigid rod heterocyclic liquid crystalline polymer films

A process is disclosed for the production of biaxially oriented liquid crystal films. The process comprises: (i) forming an anisotropic dope from a polymerization solution of rigid rod heterocyclic liquid crystalline polymers such as poly{[benzo(1,2-d:4,5-d min )bisthiazole-2,6-diyl] 1,4 - phenylene...

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Bibliographische Detailangaben
Hauptverfasser:	KAFCHINSKI, EDWARD R, CHENEVEY, EDWARD C
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process is disclosed for the production of biaxially oriented liquid crystal films. The process comprises: (i) forming an anisotropic dope from a polymerization solution of rigid rod heterocyclic liquid crystalline polymers such as poly{[benzo(1,2-d:4,5-d min )bisthiazole-2,6-diyl] 1,4 - phenylene}, its cis isomer or mixtures thereof, and poly{[benzo(1,2-d:4,5-d min )bisoxazole-2,6-diyl] 1,4-phenylene}, its cis isomer or mixtures thereof, and a solvent such as polyphosphoric acid; (ii) extruding the dope to form a film; (iii) imparting biaxial orientation to the film to increase the transverse strength thereof; (iv) solidifying the biaxially oriented film; and (v) washing the solidified film to remove the solvent. Also disclosed is a liquid crystal film produced by the above process.