Abstract: Several established methods produce precursor beads suitable for subsequent impregnation with a volatile agent for making expandable polystyrene beads. Different methods have led to production of reflector beads of crystal clear polystyrene for use as reflectors in movie screens, signs, and the like. Heretofore it has not been practical to use precursor beads as reflector beads. Many reflector beads have been made from plastics more costly than polystyrene. By the present invention, cloudy precursor beads are dispersed in an aqueous solution having a concentration of from about 1.5 to about 6 molar inorganic solute and heated to a temperature in the range from about 110.degree. to 130.degree. C. for a few minutes. The thus treated beads are rinsed with water and then dried to provide reflector beads.

Abstract: Many reflector beads have been made from plastics more costly then polystyrene. By the present invention, water white, crystal clear polystyrene beads are prepared from styrene by polymerization in an aqueous solution having a concentration of from about 2.5 to about 6 molar inorganic solute, at conditions corresponding to production of uniformly sized polystyrene beads of the type ordinarily used as precursor for expandable polystyrene beads. The thus produced beads are rinsed with water and then dried to provide reflector beads.

Abstract: The invention concerns thermoplastic molding compositions consisting essentially of a blend of:A. From about 40% to about 70% by weight of an interpolymer comprising from about 8% to about 16% block polyalkadiene, and from about 51% to about 85% styrene and from about 5% to about 35% methacrylic acid.B. From about 30% to about 60% of a polyurethane thermoplastic rubber.