HARD POLYVINYL CHLORIDE RESIN TYPE MULTILAYERED SHEET AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To enhance lightweight properties, rigidity, impact resistance or the like and to reduce the direction dependence of physical properties by integrally laminating a non-foamed surface layer composed of a polyvinyl chloride resin compsn. containing an impact resistance modifier to a foam core layer composed of a polyvinyl chloride resin compsn. containing a foaming agent and a flow characteristic modifier. SOLUTION: This hard polyvinyl chloride resin type multilayered sheet consists of a foam core layer composed of a polyvinyl chloride resin compsn. containing a foaming agent and a flow characteristic modifier and a non-foamed surface layer composed of a polyvinyl chloride resin compsn. containing an impact resistance modifier integrally laminated to the single surface or both surfaces of the foam core layer. That is, the polyvinyl chloride resin compsn. containing the foaming agent and the flow characteristic modifier and forming the foam core layer at a time of extrusion molding is melted and kneaded while the polyvinyl chloride resin compsn. containing the impact resistance modifier and forming the non-foamed surface layer at a time of extrusion molding is melted and kneaded and the latter resin compsn. is laminated to the single surface or both surfaces of the former resin compsn. to perform co- extrusion.