The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Jun. 07, 2002
Hidehiro Sasaki, Tochigi-ken, JP;
Kazuya Ogiyama, Tochigi-ken, JP;
Akinobu Hira, Tochigi-ken, JP;
Keiichi Hashimoto, Tochigi-ken, JP;
Hiroki Yanagisawa, Tochigi-ken, JP;
Hisao Tokoro, Tochigi-ken, JP;
Hidehiro Sasaki, Tochigi-ken, JP;
Kazuya Ogiyama, Tochigi-ken, JP;
Akinobu Hira, Tochigi-ken, JP;
Keiichi Hashimoto, Tochigi-ken, JP;
Hiroki Yanagisawa, Tochigi-ken, JP;
Hisao Tokoro, Tochigi-ken, JP;
JSP Corporation, Tokyo, JP;
Abstract
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.