Composites of aromatic polybenzimidazoles and polyarylates

Details Composites of aromatic polybenzimidazoles and polyarylates Composites of aromatic polybenzimidazoles and polyarylates

1988-08-03

1990-10-16

Sluby, P. C.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428480, 428483, 428412, 428367, 525425, 4273722, 4273881, 427409, 4274125, D02G 300, B32B 900, B32B 2706

Patent

active

049634348

ABSTRACT:
A composite comprising a polyarylate or an aromatic polybenzimidazole article and a coating on at least one surface of the article comprised of a blend of from about 5 to about 95 weight percent of a polyarylate and from about 95 to about 5 weight percent of an aromatic polybenzimidazole. A process for preparing the composites comprises dissolving in a mutual solvent from about 5 to about 95 weight percent of the aromatic polybenzimidazole to about 95 to about 5 weight percent of the polyarylate, based on the total weight of those polymers, heating a polyarylate or aromatic polybenzimidazole article to a surface temperature over 100.degree. C., e.g., from about 120.degree. C., to about 180.degree. C., and then coating the polyarylate or aromatic polybenzimidazole article with the solution and subsequently evaporating the solvent, thereby producing a dried coating of a blend of a polyarylate and an aromatic polybenzimidazole on at least one surface of the article. The composites, particularly in the form of films, fibers or fibrets, may be post-treated with heat or sulfuric acid in order to minimize their shrinkage when subsequently subjected to heat and in order to increase their resistance to solvents and acid.

REFERENCES:
patent: 4284549 (1981-08-01), Salee
patent: 4643937 (1987-02-01), Dickinson et al.

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