Advanced Elastomer Systems, L.p.

Tonen Sekiyukagaku K.k.

Masatoshi Isono

Takashi Nakayama

Eiji Sezaki

Hisafumi Endo

Masatoshi Akami

Sotoyuki Kitagawa

A thermoplastic elastomer composition prepared by dynamically vulcanizing a composition comprised (A) polyolefin 5-50 wt. parts, (B) brominated butyl rubber 5-50 wt. parts, (C) polychloroprene rubber 5-50 wt. parts and (D) process oil 10-50 wt. parts in the presence of peroxide is disclosed.

Thermoplastic elastomer composition

The invention relates to the process of the invention provides a radiation-crosslinked polypropylene foam by extrusion at a low temperature (about 170.degree. C.) below the decomposition point of the blowing agent. The resulting foamed item has by far better heat resistance than conventional ones. The raw resin can be prepared by mixing a resin in the pellet form and a blowing agent in the powder form on account of the low-temperature flowability. Heretofore, such mixing was impossible because the blowing agent does not disperse completely. This outstanding effect of the invention was not expected at all from the known prior arts.

Process for producing polypropylene foam

Growing community of inventors

Kanagawa, Japan

Masatoshi Isono