Foamed composite material and production thereof

摘要

The present invention relates to a foamed composite material serviceable for light weight constructional material or thermal insulating material having a high mechanical strength, particularly, high tensil strength. The foamed composite material is made by lining a surface of specific plastic foam with a lining material comprising an unsaturated polyester and vinyl monomer. The specific plastic foam is obtained by expanding thermoplastic resin particles consisting of polyolefin, vinyl aromatic polymer and graft polymer formed by graft-polymerization of vinyl aromatic monomer onto the polyolefin or otherwise, which may be produced by polymerizing a vinyl aromatic monomer impregnated into particles of polyolefin to graft the monomer onto the backbone of polyolefin. The vinyl monomer contained in the lining material penetrates into the plastic foam and hardens to bind strongly the lining layer and the plastic foam. The coated plastic foam of the present invention is useful to material for vessel, float, tank, building and the like.