Patent ID: 9499675
Filing Date: 2016-11-22
CPC Classification: B29C,B29K,C08J

Claim Text:
1. A method for producing non-crosslinked resin foam, the method comprising: melting a resin composition including 100 parts by weight of a thermoplastic polyolefin resin other than an elastomer wherein the thermoplastic polyolefin resin includes a high melt tension random polypropylene having a first melt tension of 5 cN to 50 cN at 200° C., 35 parts by weight to 55 parts by weight of an amorphous thermoplastic elastomer, and a crystalline elastomer having a higher degree of crystallization than the amorphous thermoplastic elastomer, wherein the crystalline elastomer is a block copolymer of an linear low-density polyethylene and an ethylene-α-olefin copolymer other than an linear low-density polyethylene, and having a crystallization temperature of 90° C. or higher, wherein the amorphous thermoplastic elastomer is an ethylene-propylene rubber or an ethylene-α-olefin copolymer; impregnating the resin composition with a material, wherein the material is in supercritical state; foaming the resin composition impregnated with the material by arranging the resin composition under a condition in which the supercritical state of the material is not maintained; and hot-pressing the foamed resin composition.