Intermediate, copolymer resin and production thereof

摘要

A polyimide-isoindroquinazolinedione-silicone copolymer resin produced by reacting (a) a diaminoamide, (b) a diaminosiloxane, (c) a diamine, and (d) a tetracarboxylic acid dianhydride to give a polyamide acid-silicone intermediate, which is then subjected to dehydration and ring closure, is excellent particularly in adhesiveness, moisture resistance, wear resistance and heat resistance. The polyamide acid-silicone intermediate is stable in the form of a varnish and usuable commercially as a raw material for the polyimide-isoindroquinazolinedione-silicone copolymer resin.