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AssigneeKaneka Corporation
InventorsKenji Mogami, Ryoji Nakayama
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A polypropylene-based resin composition for injection foam molding, containing (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 2 cN or less and (B) 5 to 50 parts by weight of a modified polypropylene having a melt flow rate of from 0.1 g/10 min. 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 resin (A) and the resin (B) is 100 parts by weight) and a foaming agent are supplied to an injection molding machine to be injected into a die, thereby achieving a foam molding. It is thus possible to obtain a injection foamed molded article which has a satisfactory injection foam moldability, a skin layer having little silver streaks or the like on its surface, and an internal core layer having a foam of high expansion ratio and uniformly fine and a excellent appearance glossiness, lightweightness, and rigidity at a low cost.
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:
Dependencies are inferred from the claim text.