Process for the production of biaxially oriented rigid rod...

Details Process for the production of biaxially oriented rigid rod... Process for the production of biaxially oriented rigid rod...

B - Operations, Transporting

29

C

18/793

B29C 47/88 (2006.01) B29C 55/00 (2006.01) B29C 55/12 (2006.01) B29C 55/26 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2005104

ABSTRACT OF THE DISCLOSURE 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')bisthiazole-2,6-diyl] 1,4 - phenylene), its cis isomer or mixtures thereof, and poly([benzo(1,2-d:4,5-d')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. 0

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