POLYVINYLKLORIDHARTSKOMPOSITION FOR CELLPLAST

摘要

A resin composition of a polyvinyl chloride-based resin expandable into foamed bodies by heating comprises a polyvinyl chloride-based resin having an average degree of polymerization not exceeding 2000 and a pore volume not exceeding 0.20 ml/g and impregnated with a volatilizable foaming agent which is a hydrocarbon compound or a halogenated hydrocarbon compound having a boiling point not exceeding 90 DEG C. The resin composition may further comprise a foam-conditioning agent selected from acrylic resins and styrene-based resins having a reduced viscosity of at least 3.0 dl/g and, optionally, a nucleating agent and a decomposable foaming agent. The resin composition of the invention can give a foamed body of high expansion with very fine and uniform cell structure and also free from undesirable coloration due to the absence or limited use of a decomposable foaming agent which produced colored products by decomposition.