Abstract: A graft modified polyethylene process is described which comprises contacting polyethylene with an organic peroxide in the presence of an ethylenically unsaturated polycarboxylic acid or derivative thereof at a temperature of from 140.degree.-210.degree. C. The resulting graft modified polyethylene in combination with polyamides provide polymer blends having improved impact properties.

Abstract: A process is provided for making polyimides having chemically combined polydiorganosiloxane blocks. An excess organic dianhydride is contacted with an organic diamine in a refluxing halogenated aromatic hydrocarbon solvent in the presence of an acid catalyst to produce an intermediate polyimide product. The temperature of the mixture is thereafter lowered, and amino-terminated polydiorganosiloxane is added to the mixture to effect the incorporation of polydiorganosiloxane blocks into the polyimide. There is produced clear polyimide-polydiorganosiloxane block polymer useful as an insulating layer on semi-conductor devices.