Catalytic preparation of polyamide or polyamide-polymide with N,

Details Catalytic preparation of polyamide or polyamide-polymide with N, Catalytic preparation of polyamide or polyamide-polymide with N,

1986-02-12

1989-01-03

Anderson, Harold D.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 48, 528342, C08G 1834

Patent

active

047957956

ABSTRACT:
A polyamide and/or polyimide is prepared by using N,N'-dimethylethyleneurea or N,N'-dimethylpropyleneurea as a solvent upon polycondensation of a polycarboxylic acid and a diisocyanate at a temperature above 100.degree. C. in the presence of an alkali metal carbonate, alkali metal hydrogencarbonate, alkali metal hydroxide or an alkali metal salt of a polycarboxylic acid.

REFERENCES:
patent: 4061622 (1977-12-01), Onder
patent: 4094866 (1978-06-01), Onder
patent: 4156065 (1979-05-01), Onder et al.
patent: 4395531 (1983-07-01), Toyoda et al.

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