Two-stage process and product for producing...

Details Two-stage process and product for producing... Two-stage process and product for producing...

C - Chemistry, Metallurgy

08

G

402/171

C08G 73/18 (2006.01)

Patent

CA 1233596

A B S T R A C T A two stage process for the production of polybenzimidazoles and a novel polybenzimidazole produded there by is provided wherein a mix- ture of an aromatic tetraamine, e.g., 3,3',4,4'- tetraaminobiphenyl and a free dicarboxylic acid, e`.g., isophthalic acid, is 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 viscosity. The agitation is then discontinued and the reaction mix- ture 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 prepoly- mer which is heated with agitation in a second stage until the desired polymer is obtained. The novel polybenzimidazole produced is the reaction product of phenylindandicarboxylic acid and 3,3',4,4'- tetraaminobiphenyl.

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