Accession Number : AD0164646

Title :   Preparation of Polybenzimidazoles in the Presence of a Sulfone Solvent.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Hedberg,Frederick L. ; Marvel,Carl S.

Report Date : 08 JAN 1974

Pagination or Media Count : 5

Abstract : The invention relates to a process involving a one-step condensation reaction for preparing high molecular weight polybenzimidazoles. It comprises reacting an aromatic tetraamino compound with the diphenyl ester or anhydride of an aromatic dicarboxylic acid in the presence of an aliphatic or aromatic sulfone solvent or reaction medium. The process provides in quantitative yields high molecular weight products that are particularly suitable for use in fiber formation.

Descriptors :   *Patents, *Condensation reactions, *Sulfones, Amines, Organic solvents, Synthesis(Chemistry), Polymerization

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE