Method for making polyetherimides using a sodium chloride or ferric sulfate catalyst
AssigneeGeneral Electric Company
InventorsFrank J. Williams, III, Howard J. Klopfer
Life of this patent
Estimating the term…
Abstract
A method is provided for enhancing the rate of formation of polyetherimides by using either a sodium chloride catalyst, or ferric sulfate catalyst in a mixture of an aromatic bis(ether anhydride) and an organic diamine under melt polymerization conditions.
Claims7
A method for making polyetherimides consisting essentially of chemically combined units of the formula ##STR7## where R is a divalent aromatic organic radical having from 6-30 carbon atoms, R.sup.1 is a divalent organic radical selected from R radicals, alkylene radicals having from 2-20 carbon atoms, cycloalkylene radicals, and C.sub.(2-8) alkylene terminated polydiorganosiloxane radicals, which comprises effecting the reaction under melt polymerization conditions between an aromatic bis(ether anhydride) of the formula ##STR8## and an organic diamine of the formula
- H.sub.2 NR.sup.1 NH.sub.2
- in the presence of a metal catalyst selected from the class consisting of sodium chloride and ferric sulfate.
Dependencies are inferred from the claim text.