Single-stage melt polymerization process for the production of h

Details Single-stage melt polymerization process for the production of h Single-stage melt polymerization process for the production of h

1980-07-15

1982-01-26

Welsh, Maurice J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528184, 528186, 528312, 528313, 528318, 528331, 528336, 528342, C08G 7318

Patent

active

043129765

ABSTRACT:
A single-stage melt polymerization process for the production of high molecular weight polybenzimidazole is provided. The process comprises reacting a monomeric reactant or reactants, which are capable of reacting to form a polybenzimidazole, at a temperature above the melting temperature of the monomeric reactant or reactants in the presence of a catalyst selected from the group consisting of organic sulfonic acids, halogenated acetic acids, and non-oxidizing inorganic acids. The polybenzimidazole is preferably produced by the reaction of 3,3',4,4'-tetraaminobiphenyl with isophthalic acid at a temperature within the range of approximately 360.degree. C. to 425.degree. C. for a period of time within the range of approximately 3 to 5 hours in the presence of approximately 0.25 to 0.5 percent by weight, based upon the weight of the isophthalic acid, of p-toluenesulfonic acid. The process of the present invention is conducted in the absence of a solvent, generates only a small amount of foam, and forms water as the sole, readily removable by-product.

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patent: 4154919 (1979-05-01), Sheratte

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