COMPOSITE MATERIAL CONSISTING OF FOAM AND SKIN MATERIAL AND MOLDING OBTAINED THEREFROM

摘要

PURPOSE: To prevent that polypropylene resin foam is collapsed to become thin and non-uniform in thickness and unevenness is generated on the surface of a skin material when aggregate is integrally molded into a composite object by bonding the skin material to one surface of the polypropylene resin foam of which the closed cell ratio and gell ratio are respectively specific values or more. CONSTITUTION: A composite material consists of polypropylene resin foam wherein a closed cell ratio is 70% or more and a gell ratio is 40% or more and the skin material bonded to one surface of the foam. When the closed cell ratio of the foam is below 70% and the gell ratio thereof is below 40%, when a thermoplastic resin for aggregate is integrally molded, the foam is collapsed by heat and pressure to become thin and non-uniform in thickness. The polypropylene resin foam by a predetermined crosslinking method is produced by melting and kneading a compd. obtained by adding a foaming agent and a crosslinking agent to a polypropylene resin to prepare a foamable polypropylene resin compsn. and forming a sheet from this compsn. to crosslink the same and foaming the foaming agent by heating to form foam.