Freeman Chemical Corporation

John J Szwarc

Robert H Leitheiser

William J Plant

Useful copolymerizable compositions include 10 to 50 parts by weight of (I) a polymerizable diurethane monomer having the general formula ##STR1## wherein R.sub.1 is --H; or --CH.sub.3 ;

Copolymerizable compositions and method of making the same

Multiple layer light transmissive laminates and a method for making them. Such laminates are particularly adapted for use as glazing materials. The laminates retain light transmissivity after exposure to elevated temperatures. The laminates include two or more layers of light transmissive sheets such as glass, polymerized methylmethacrylate and the like, bonded together by means of a thermosetting resin which is cured in the absence of free oxygen and in the absence of oxygen-generating polymerization initiators. The curing is achieved by means of radiation energy delivered through at least one light-transmissive sheet into the resin.

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Fredonia, WI, United States of America

John J Szwarc