Soluble polyimidesiloxanes and methods for their preparation and use

Abstract From the Canadian patent

Substantially fully imidized polyimidesiloxanes which are based on a mixture consisting essentially of a biphenyl tetracarboxylic dianhydride and a benzophenone tetracarboxylic dianhydride are soluble in diglyme which gives them particular utility in the micro-electronics industry. The polymers are prepared from the mixture of dianhydrides, a difunctional siloxane monomer and an organic diamine. Diamines can be used to provide an asymmetrical structure in the polyimidesiloxane polymer chain. The polyimidesiloxane can be prepared with functional groups which render them directly curable. The polyimidesiloxanes can also be prepared with functional groups which when reacted with an unsaturated …