Process for producing solution of high-molecular weight polycarb

Details Process for producing solution of high-molecular weight polycarb Process for producing solution of high-molecular weight polycarb

1992-12-17

1994-08-16

Kight, III, John

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524710, 524793, 524873, 528 44, 528 48, 528 51, 528 67, C08L 7900, C08K 502

Patent

active

053387945

ABSTRACT:
A process for producing a high-molecular weight polycarbodiimide solution by subjecting isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, tetramethylxylylene diisocyanate or a mixture thereof to decarboxylation and condensation reaction in the presence of a carbodiimidization catalyst, in which process tetrachloroethylene, trichloroethylene, tetrachloroethane, trichloroethane or a mixture thereof is used as the polymerization solvent, the monomer concentration is 18% by weight or less, and the reaction temperature is 80.degree. C. or above.

REFERENCES:
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patent: 2941966 (1960-06-01), Campbell
patent: 2941983 (1960-06-01), Smeltz
patent: 3929733 (1975-12-01), Alberino et al.
patent: 3960950 (1976-06-01), Hansen
patent: 4067820 (1978-01-01), Wagner et al.
patent: 4088665 (1978-05-01), Findeisen et al.
patent: 4105643 (1978-08-01), Smith
patent: 4344855 (1982-08-01), Schafer et al.

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