Heating and drawing aromatic films and fibres for minimal...

Details Heating and drawing aromatic films and fibres for minimal... Heating and drawing aromatic films and fibres for minimal...

B - Operations, Transporting

29

C

18/1043, 18/635

B29C 55/02 (2006.01) D01F 6/76 (2006.01) D02J 1/22 (2006.01)

Patent

CA 1070463

ABSTRACT OF THE DISCLOSURE Highly unusual and useful novel high-performance, oriented, low- crystalline, essentially heterocyclic structures, e.g. films, are prepared from certain novel and important process sequences. These structures, e.g. films (in the direction of orientation) and fibers, possess a unique combination of minimal shrinkage at high temperatures, after orientation, coupled with negli- gible coefficient of expansion over an unusually wide temperature range. These advantages are obtained in an orientation process by controlling and selecting; (a) the temperature of orientation or stretching; (b) the rate of orientation; (c) the ultimate percent of stretch in the final product; and (d) a relatively rapid quench.

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