C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 75/32 (2006.01) C08G 73/06 (2006.01) C08G 73/18 (2006.01) C08G 73/22 (2006.01)
Patent
CA 2053757
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. 38,087A-F
Gregory Thomas
Hurtig Carl W.
Ledbetter Harvey D.
Quackenbush Kenneth J.
Rosenberg Steven
Smart & Biggar
The Dow Chemical Company
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