Polybenzimidazole compounds in solution and a process for the pr

Details Polybenzimidazole compounds in solution and a process for the pr Polybenzimidazole compounds in solution and a process for the pr

1997-06-18

1999-05-11

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528171, 528183, 528185, 528186, 528188, 528219, 528220, 528228, 528229, 528310, 528331, 5283393, 528341, 528342, 528352, C08G69/00;73/18

Patent

active

059028769

ABSTRACT:
Improved process for producing a polybenzimidazole compound in solution by dissolving a fully dried polybenzimidazole of the following general formula (1) or (2) in N,N-dimethylacetamide of a sufficiently reduced water content at an elevated temperature of 260.degree. C. or higher in an inert gas atmosphere and a solution of the polybenzimidazole compound produced by the process. The solution remains useful for an extended time without using metal salts or any other stabilizers: ##STR1## where R.sup.1, R.sup.2 and R.sup.5 are tetra-, di- and trivalent aromatic groups, respectively; R.sup.3, R.sup.4 and R.sup.6 are each independently a hydrogen atom, an alkyl group or an aryl group; n is an integer of 2 or more.

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patent: 5194562 (1993-03-01), Inbasekaran et al.
patent: 5410012 (1995-04-01), Connell et al.

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