METHOD FOR PRODUCING A LAMINATED MATERIAL

摘要

A method for producing a laminated material comprising a lower layer of highly-expanded plasticized polyvinyl chloride with cross-linking and a surface layer of thermoplastic resin sheet laminated on an upper surface of said lower layer, said method comprising; sufficiently heating and kneading raw materials for the lower layer except a cross-linking agent and a blowing agent mixing with the reacting groups in an extruder; adding the cross-linking agent and the blowing agent; heating and kneading the obtained material at or less a reacting temperature of the cross-linking agent and a decomposition temperature of the blowing agent to obtain a sheet; heating the sheet to cross-link and expand the sheet to form the lower layer of cross-linked highly-expanded plasticized polyvinyl chloride; and laminating the surface layer of the thermoplastic resin on the upper surface of the lower layer. The polyvinyl chloride resin is (A) a polyvinyl chloride resin having reacting groups in its molecules, or (B) a mixture of a polyvinyl chloride resin having no reacting groups in its molecules and a thermoplastic resin having reacting groups in its molecules.