Preparation of polyamideimide from diisocyanate with alkali meta

Details Preparation of polyamideimide from diisocyanate with alkali meta Preparation of polyamideimide from diisocyanate with alkali meta

1977-02-17

1978-06-13

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 302, 260 326NA, 260 47CP, 260 63N, 260 78R, 260 47CB, C08G 1820, C08G 1822, C08G 7314

Patent

active

040948641

ABSTRACT:
The use of certain catalysts provide for an improved process for the preparation of soluble polyimides, polyamides, and polyamideimides. The catalysts are compounds of formula ##STR1## WHEREIN M represents an alkali metal, and n is an integer from 2 to 5 inclusive. The improved process comprises reacting organic diisocyanates with polycarboxylic compounds consisting of tetracarboxylic acids or the intramolecular dianhydrides thereof, tricarboxylic acids or the monoanhydrides thereof, dicarboxylic acids, and mixtures thereof, in the presence of said catalysts. The polymers are obtained in solution at low reaction temperatures and short reaction times thereby avoiding side-reactions which otherwise would be detrimental to polymer molecular weight and ultimate polymer properties.

REFERENCES:
patent: 3562217 (1971-02-01), Zalewski et al.
patent: 3620987 (1971-11-01), McLaughlin
patent: 3658773 (1972-04-01), Zecher et al.
patent: 3682860 (1972-08-01), Yoda et al.
patent: 3701756 (1972-10-01), Carleton et al.
patent: 3803100 (1974-04-01), Izomi et al.
patent: 3853813 (1974-12-01), Edelman et al.
patent: 3873503 (1975-03-01), Hoheisel et al.

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