Polyetherimides prodn - by copolymer of bis-(nitrophthalimides) with a divalent carbocyclic arom residue

摘要

A polyetherimide of formula (I) (where R is a carbocyclic arom. 6-20C residue, R' is R or, additionally xylylene or alkylene with 2-20 C-atoms, cycloalkylene, bis(4-cycloalkyl) low)-alkylene or alkylcycloalkylene; n is 1; -O-Z is a (a), (b) or (c) where R" is H, low alkyl or low alkoxy; and the oxygen may be in o- or p-posn. at any ring, and the polyetherimide is terminated by a nitro-substd. arom. or hydroxyphenyl grp. is prepd. by reacting a salt of an org. cpd. MO-R-OM (M is an alkali metal and R is a divalent carbocylic arom 2-20C residue) with a bisphthalimide e.g. 4,4'-bis-(3-nitrophthalimido)diphenylether, in a dipolar aprotic solvent. Used in mfre. of heat-resistant films, press mouldings, wire varnish.