Abstract: The present invention is directed to optionally cellular, molded polyurethane plastics having a solid surface and characterized by a content of about 0.1 to 8.0% by weight, based on the weight of the polyurethane plastic, of a polysiloxane which is chemically incorporated into the polyurethane structure.The present invention is also directed to a process for the production of these molded plastics by reacting in closed molds a reaction mixture containinga) a polyisocyanate component,b) a component containing at least one organic compound having at least two isocyanate-reactive groups and a molecular weight of 400 to about 20,000 andc) optionally a compound having at least two isocyanate-reactive groups and a molecular weight of 18 to 399,wherein a portion of component b) and/or c) contains at least one polysiloxane containing at least two isocyanate-reactive groups in an amount of about 0.1 to 8.0% by weight, based on the weight of the polyurethane plastic.

Abstract: Composite materials are formed by subjecting a highly elastic material to a plasma treatment and then allowing a polyurethane foam forming mixture to foam on the plasma treated surface. These composites are particularly useful as shoe soles and as insulating materials.