Abstract: Synthetic resin plates having an irregular flow pattern of different colors are prepared by continuously polymerizing polymerizable materials in a polymerization zone defined by confronting surfaces of two confronting and running endless belts and gaskets held between the confronting surfaces of the belts. Polymerizable materials of different colors are supplied in the polymerizable material supply region close to the upstream end of the polymerization zone by a plurality of supply means, each of which includes at least one polymerizable material supply opening to the polymerizable material supply region. The supply means are arranged in such a manner that they are spaced from one another in the direction of travel of the belts.

Abstract: An acrylic laminated diffuser panel having a high light-diffusing property is provided, which comprises a laminate of an acrylic resin film having a high light-diffusing property and an acrylic resin plate, wherein the acrylic resin film is integrated with the acrylic resin plate. The acrylic laminated diffuser panel is prepared by laminating the acrylic resin film on the molding surface of at least one of a pair of casting mold parts, casting an acrylic monomer or its partially polymerized product into a space between said pair of casting mold parts, and then, polymerizing the acrylic monomer or the partially polymerized product.