Abstract: This invention is directed to a novel method and apparatus for casting stress-free thermosetting resin materials. A process for forming a thermosetting product which comprises: (a) pouring a thermosetting polymer, with initiator, and catalyst, into a cavity of a mold which has a polymer coating or film on the interior surface thereof; (b) permitting the polymer to cure to a point where the cured material is reasonably dimensionally stable; (c) removing the partially cured polymeric material from the mold and placing the material in an oven; and (d) fully curing the polymeric material in the oven.

Abstract: This invention is directed to a novel translucent polymerized panel which can be used as is or be foamed or reinforced with glass fibre or other types of fibre, or reinforcing materials. These panels have good light transmitting, weathering and insulating qualities and do not yellow upon prolonged exposure to ultraviolet light. The invention is directed to a process of producing an acrylic product which is susceptible to foaming upon the application of heat, if a blowing agent is incorporated therein, or can be used with glass fibre reinforcement as a laminating panel. The process comprises: mixing an acrylate or methacrylate monomer, a vinyl monomer, vinyl acetate monomer, polyvinyl chloride monomer, or co-monomers thereof, a polymerization initiator, a molecular weight controlling agent, a catalyst and a metal substitute organic initiator, and polymerizing the mixture to produce a polymerized solid clear product.