The crystal Characteristic polypropylene regin foaming body and the crystal Characteristic

摘要

PROBLEM TO BE SOLVED: To produce a crystalline polypropylene-based resin foam excellent in mechanical strength and impact resistance. SOLUTION: This crystalline polypropylene-based resin foam has a cross- shaped molecular orientation in the plane direction measured by a microwave molecular orientation analyzer. Furthermore, the method for producing the crystalline polypropylene-based resin foam comprises carrying out the extrusion expansion of a crystalline polypropylene-based resin containing a foaming agent, orienting the resultant extruded foam 4 in a state of the softened resin in the interior while cooling and thereby providing the cross-shaped molecular orientation in the plane direction measured with the microwave molecular orientation analyzer.