Abstract: An additive-containing resin molded article which suffers from little exudation or vaporization of an additive and sustains the effect of the additive for a long period of time and in which reductions in various physical properties due to molecular weight reduction of a polyester resin are suppressed, and a process for producing the same are provided. When a polyester resin 5 is heat-melted and molded into a prescribed shape by means of an extruder 1, etc., a bi- or multi-functional additive 6 having at least one of a functional hydroxyl group, carboxyl group, amino group, and ester bond is added and allowed to react with the polymer molecules of the molten polyester resin 5 to obtain an additive-containing resin molded article 50 in which the additive 6 is bonded to the polymer molecules through an ester linkage or an amide linkage.

Abstract: A functional block copolymer useful as a compatibilizing agent for a blend of a condensation polymer and vinyl polymer comprises segments of a condensation polymer and a vinyl polymer derived from a reactive functional group-containing monomer or a functions-imparting monomer such as ultraviolet absorption or flame retardant functions. The block copolymer can further include a segment of a lower cohesive energy polymer. The condensation or vinyl polymer segment, or the lower cohesive energy polymer segment contains azo or peroxide groups which act as a polymerization initiator for the copolymerization of the vinyl monomer forming the vinyl polymer segment.