C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/171
C08G 73/18 (2006.01)
Patent
CA 1239730
A B S T R A C T A two stage process for the production of polybenzimi- dazoles is provided wherein an aromatic tetraamine, e.g., 3,3',4,4' - tetraaminobiphenyl, is reacted with a dicarbo xylic component consisting of at least one compound having the formula: Image in which R' is a divalent organic radical and may be the same or different in the various molecules making up the dicarbox- ylic component and the Y's may be the hydrogen, aryl or alkyl, with no more than 95% the Y's being hydrogen or phenyl. The reactants are heated with agitation in a first stage to a temperature above the melting point of the tetraamine until the viscosity of the mixture rises as indicated by an agitator torque of at least 1.5 times that before the rise in viscos- ity. The agitation is then discontinued and the reaction mixture is allowed to foam while heating is continued. The foam is then allowed to cool to a friable mass and is crushed to a ground prepolymer which is heated with agitation in a second stage until the desired polymer is obtained. The invention also includes certain benzimidazole polymers as new composition of matter.
489789
Celanese Corporation
Smart & Biggar
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