PROCESS FOR PRODUCTION OF FOAMED RESIN SHEETS

摘要

The invention provides a process for production of foamed resin sheet which enables satisfactory dispersion of a nucleating agent in a thermoplastic resin and which attains excellent extrusion formability and is excellent in productivity. There is provided a process for production of foamed resin sheet by extruding a thermoplastic resin prepared by incorporating a nucleating agent and a foaming agent consisting of a gas containing at least one of nitrogen and carbon dioxide into a thermoplastic resin, characterized in that the process further comprises incorporating into the thermoplastic resin high molecular weight ester and a wetting agent having a kinematic viscosity coefficient (a kinematic viscosity coefficient at 100°C; centistokes) of 70 to 2700.