Catalytic condensation of isocyanates and carboxylic acids or an

Details Catalytic condensation of isocyanates and carboxylic acids or an Catalytic condensation of isocyanates and carboxylic acids or an

1977-01-21

1979-05-22

Lee, Lester L.

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...

260326R, 260558R, 528 73, 528 84, C08G 1816, C08G 7310

Patent

active

041560655

ABSTRACT:
An improved process is described for the reaction of an isocyanate (mono or poly) with a carboxylic acid or anhydride (mono or poly) to form the corresponding imide, amide or amide-imides. The improvement lies in using as the catalyst the 1-oxide, 1-sulfide or 1-hydrocarbylimino derivative of a phospholene, phospholane or phosphetane. The latter compounds are also substituted in the 1-position by a hydrocarbyl (C.sub.1-12) or halohydrocarbyl (C.sub.1-12) and may additionally carry one or more halo, lower-alkoxy, phenoxy, lower-hydrocarbyl or halo-substituted hydrocarbyl groups on the ring carbon atoms.

REFERENCES:
patent: 3541038 (1970-11-01), Nakano et al.
patent: 3697484 (1972-10-01), Zecher et al.
patent: 3708458 (1973-01-01), Alberino et al.
patent: 3755242 (1973-08-01), Reich

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