Preparation of polybenzimidazoles

Details Preparation of polybenzimidazoles Preparation of polybenzimidazoles

1975-03-27

1977-01-11

Wyman, Daniel E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2602948C, 2602948F, 260556S, C07C14375, C07C14377, C07C14379

Patent

active

040026795

ABSTRACT:
A process for preparing polybenzimidazoles is disclosed in which aromatic bis-orthoaminosulfonamides and aromatic dicarboxylic acids or derivatives thereof are polymerized in polyphosphoric acid. The process provides thermally stable heterocyclic polymers of very high molecular weight that are especially useful in forming films and fibers.

REFERENCES:
patent: 3546181 (1970-12-01), Arnold
patent: 3632414 (1972-01-01), Arnold et al.
patent: 3702326 (1972-11-01), Arnold
patent: 3740374 (1973-06-01), Arnold et al.
patent: 3784517 (1974-01-01), Hedberg et al.

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