Convective leaching of polybenzazole films

Details Convective leaching of polybenzazole films Convective leaching of polybenzazole films

1993-01-05

1994-03-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

264184, 264233, 26433111, 26433112, 264344, 528183, B29C 7102

Patent

active

052924700

ABSTRACT:
Films made from polybenzazole dopes can quickly be leached to remove polyphosphoric acid and other residual solvents by passing a leaching fluid such as steam through pores in the wet, never dried film. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

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