Process for preparing methacrylimide-containing polymers

摘要

Methacrylimide-containing polymers are continuously produced by introducing 10 to 60 wt. % of an inert solvent, 90 to 40 wt. % of methacrylic acid, a methacrylic acid ester or a monomer mixture comprising at least 50 wt. % of methacrylic acid or a methacrylic acid ester, and a radical polymerization initiator and a molecular weight modifier into a polymerization reaction zone, converting at least 80 wt. % of the charged monomer to a polymer at 60 DEG -170 DEG C., adding a compound represented by the formula: R-NH2 wherein R represents a hydrogen atom, an alkyl group having 1-12 carbon atoms, a cycloalkyl group having 7-11 carbon atoms or an aryl group having 6-10 carbon atoms, to the polymerization reaction liquid, carrying out reaction of the resulting mixture at 150 DEG to 300 DEG C. in an imidization reaction zone, and finally separating volatile substances from the reaction fluid.