Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-02-17
1978-06-13
Anderson, Harold D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 47CB, 260 47CZ, C08G 1820, C08G 1822, C08G 6926
Patent
active
040948668
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.
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Anderson Harold D.
Firth Denis A.
Rose James S.
The Upjohn Company
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