Staged polymerization of polybenzazole polymers

Details Staged polymerization of polybenzazole polymers Staged polymerization of polybenzazole polymers

1990-10-19

1993-03-16

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528183, 528185, 528188, 528327, 528330, 528331, 528337, 528341, 528342, 528346, 528347, 528348, 528352, 528353, 528364, C08G 6300, C08G 6926, C08G 6368, C08G 6942

Patent

active

051945681

ABSTRACT:
It is advantageous to prepare oligomers of polybenzazole polymers by reaction of AA-PBZ monomer with an excess of BB-PBZ monomer. The resulting oligomer dopes may be stored at a temperature at which they remain pumpable until such time as the dope can be advanced to higher molecular weight by adding additional AA-PBZ monomer. The molecular weight of the polymer may be adjusted by controlling the amount of chain extender and/or chain terminator added to oligomer mixtures as they are advanced to final molecular weight.

REFERENCES:
patent: 4229566 (1980-10-01), Evers et al.
patent: 4359567 (1982-11-01), Evers
patent: 4423202 (1983-12-01), Choe
patent: 4533693 (1985-08-01), Wolfe et al.
patent: 4578435 (1986-03-01), Tsai et al.
patent: 4772678 (1988-09-01), Sybert et al.
Ledbetter et al., "An Integrated Laboratory Process for Preparing Rigid Rod Fibers from the Monomers," The Materials Science and Engineering of Rigid-Rod Polymers, pp. 253-263.

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