Patent ID: 7423071
Filing Date: 2008-09-09
Classification: C08F,C08J,C08L,Y10T

Abstract:
1. A process for preparing a polypropylene-based resin foamed molded article comprising supplying a polypropylene-based resin composition for injection foam molding and a foaming agent to an injection molding machine and forming a melt mixture and injecting said melt mixture into a die for foam molding, wherein said foam-molding is performed by injecting said melt mixture into a die which is pressurized with a gaseous substance to a pressure preventing foaming at a flow front of the melt mixture and said polypropylene-based resin composition for injection foam molding comprises: (A) 50 to 95 parts by weight of a linear polypropylene-based resin having a melt flow rate of from 10 g/10 min. to 100 g/10 min. and a melt tension of not more than 2 cN; (B) 5 to 50 parts by weight of a modified polypropylene having a melt flow rate of from 0.1 g/10 mm. to less than 10 g/10 min. and a melt tension of 5 cN or more and exhibiting a strain hardening property (provided that a total of the linear polypropylene-based resin (A) and the modified polypropylene-based resin (B) is 100 parts by weight).