Abstract: A process for an extruded resin foam, comprising extruding a foamable composition comprising a melted polystyrene resin and a physical blowing agent through a die to obtain a polystyrene resin foam having a thickness of at least 10 mm and a transverse cross-sectional area of at least 50 cm2, wherein said extrusion is performed so that the ratio Mz/Mn of a Z average molecular weight Mz of the polystyrene resin foam to a number average molecular weight Mn of the polystyrene resin foam, each measured by gel permeation chromatography, is 8.0 or more.

Abstract: The present invention relates to a process for preparing an extruded polystyrene resin foam board having excellent flame retardancy and recyclability, which comprises extruding and foaming a foamable composition, the foamable composition containing a polystyrene resin, a blowing agent and a specific flame retardant including a phosphate ester and a brominated bisphenol ether compound represented by the formula shown in the specification, and to a polystyrene resin foam board having excellent flame retardancy, environmental compatibility and recyclability.

Abstract: The present invention relates to a hollow molded foam article in which a plurality of polypropylene resins are used as the base resin, and to a process for the production of this hollow molded foam article. More particularly, the present invention relates to a polypropylene resin hollow molded foam article having a foam layer, in which the base resin comprises (a) a polypropylene resin with a melt tension of at least 98 mN and a melt flow rate of 0.5 to 15 g/10 minutes, (b) a polypropylene resin with a melt tension of less than 30 mN (excluding O) and a melt flow rate of 2 to 30 g/10 minutes, and (c) a polypropylene resin with a melt tension of at least 30 mN and less than 98 mN and a melt flow rate of 2 to 15 g/10 minutes, formed by positioning in a mold a softened cylindrical foam having a foam layer obtained by extruding from the die of an extruder a foamable molten resin composition containing a foaming agent, wherein the melt tension at 230° C.

Abstract: The present invention relates to a hollow molded foam article in which a plurality of polypropylene resins are used as the base resin, and to a process for the production of this hollow molded foam article. More particularly, the present invention relates to a polypropylene resin hollow molded foam article having a foam layer, in which the base resin comprises (a) a polypropylene resin with a melt tension of at least 98 mN and a melt flow rate of 0.5 to 15 g/10 minutes, (b) a polypropylene resin with a melt tension of less than 30 mN (excluding O) and a melt flow rate of 2 to 30 g/10 minutes, and (c) a polypropylene resin with a melt tension of at least 30 mN and less than 98 mN and a melt flow rate of 2 to 15 g/10 minutes, formed by positioning in a mold a softened cylindrical foam having a foam layer obtained by extruding from the die of an extruder a foamable molten resin composition containing a foaming agent, wherein the melt tension at 230° C.

Abstract: A process for an extruded resin foam, comprising extruding a foamable composition comprising a melted polystyrene resin and a physical blowing agent through a die to obtain a polystyrene resin foam having a thickness of at least 10 mm and a transverse cross-sectional area of at least 50 cm2, wherein said extrusion is performed so that the ratio Mz/Mn of a Z average molecular weight Mz of the polystyrene resin foam to a number average molecular weight Mn of the polystyrene resin foam, each measured by gel permeation chromatography, is 8.0 or more.

Abstract: The present invention relates to a hollow molded foam article in which a plurality of polypropylene resins are used as the base resin, and to a process for the production of this hollow molded foam article. More particularly, the present invention relates to a polypropylene resin hollow molded foam article having a foam layer, in which the base resin comprises (a) a polypropylene resin with a melt tension of at least 98 mN and a melt flow rate of 0.5 to 15 g/10 minutes, (b) a polypropylene resin with a melt tension of less than 30 mN (excluding O) and a melt flow rate of 2 to 30 g/10 minutes, and (c) a polypropylene resin with a melt tension of at least 30 mN and less than 98 mN and a melt flow rate of 2 to 15 g/10 minutes, formed by positioning in a mold a softened cylindrical foam having a foam layer obtained by extruding from the die of an extruder a foamable molten resin composition containing a foaming agent, wherein the melt tension at 230° C.