Novel polyetherimides

A polyetherimide of the formula

• [A].sub.m [B].sub.1.sub.-m,
• where the m is a number greater than 0 and smaller than 1, where A units are of the formula:
• ##SPC20##
• where --O--Z--O-- is in the 3 or 3'- and 4 or 4'-positions and Z is a member of the class consisting of (1) ##SPC21##
• and (2) divalent organic radicals of the general formula:
• ##SPC22##
• where X is a member selected from the class consisting of divalent radicals of the formulas, --C.sub.y H.sub.2y --, ##EQU1## --O-- and --S--, where q is 0 or 1, y is a whole number from 1 to 5, R is a divalent organic radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms, C.sub.(2.sub.-8) alkylene terminated polydiorganosiloxane, and (c) divalent radicals included by the formula ##SPC23##
• where Q is a member selected from the class consisting of --O--, ##EQU2## --S--, and --C.sub.x H.sub.2x --, and x is a whole number from 1 to 5 inclusive, and where the B units are of the formulas:
• ##SPC24##
• or mixtures thereof, where R is a divalent organic radical as previously defined, and independently a and b represent a whole number in excess of 1.