Process for the drying and heat-treatment of polybenzazole films

Details Process for the drying and heat-treatment of polybenzazole films Process for the drying and heat-treatment of polybenzazole films

1994-01-14

1995-08-29

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642112, 2642356, 2642884, 264346, B29C 4700, B29C 5508, B29C 7102

Patent

active

054457793

ABSTRACT:
A simplified and more efficient process is described for drying (and heat-treating) a lyotropic polybenzazole film in which the film is constrained in only the machine direction during drying (and heat-treating). The amount of stretching in the transverse direction the film undergoes prior to it being coagulated can be increased to compensate for the relaxation of the film during the drying process and the lack of stretching during the heat-treating process. Films made in this manner have acceptable finished properties.

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