Jsp Corporation

Hiroki Yanagisawa

Hidehiro Sasaki

Hisao Tokoro

Keiichi Hashimoto

Akinobu Hira

Kazuya Ogiyama

A method for producing expanded polypropylene resin particles wherein polypropylene resin particles impregnated with a physical blowing agent are heated along with an aqueous medium and a dispersant and are released and expanded at reduced pressure from the interior of a pressure-tight vessel, wherein the aforementioned aqueous medium has an electrical conductivity of from not less than 0.00 ms/m to not more than 20.00 mS/m. The resulting particles obtained are without inconsistencies caused by differences in the amount of dispersant adhering to the particles or the amount of dispersant added to prevent the particles from fusing together during the heat treatment step of the method.

Growing community of inventors

Tochigi-ken, Japan

Hiroki Yanagisawa