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:
Jun. 12, 2001
Filed:
Sep. 17, 1999
Yukio Mizutani, Tokuyama, JP;
Satoshi Nagou, Tokuyama, JP;
Tokuyama Corporation, Tokuyama, JP;
Abstract
A polyolefin porous material is produced by synthesizing silica particles, polysiloxane particles or crosslinked vinyl polymer particles having an average particle diameter of 0.01 to 0.1 &mgr;m in a molten polyolefin to obtain a polyolefin composition. The polyolefin composition is subsequently subjected to molding and stretching to obtain a polyolefin porous material. The obtained polyolefin porous material contains fine particles dispersed therein, substantially without forming agglomerates, and has an average pore diameter of 0.005 to 0.1 &mgr;m. The small pore diameter allows the material to be used as a liquid/liquid separation membrane, a base material for precision filtration, or a separator for batteries.