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:
Oct. 09, 2018
Filed:
Jun. 04, 2014
Tokyo Metropolitan University, Tokyo, JP;
3dom Inc., Sagamihara, JP;
Tokyo Ohka Kogyo Co., Ltd., Kawasaki, JP;
Kiyoshi Kanamura, Tokyo, JP;
Hirokazu Munakata, Tokyo, JP;
Kazuhiro Imazawa, Kanagawa, JP;
Hiroyoshi Sago, Kanagawa, JP;
TOKYO METROPOLITAN UNIVERSITY, Tokyo, JP;
3DOM INC., Sagamihara, JP;
TOKYO OHKA KOGYO CO., LTD., Kawasaki, JP;
Abstract
A method for manufacturing, a secondary battery separator including a porous resin film in which pores have three-dimensionally ordered structure and are in mutual communication via through-holes. The method includes: uniformly dispersing spherical microparticles having narrow particle size distribution in a dispersion medium to prepare a microparticles-dispersed slurry; drying slurry to obtain a spherical microparticles-dispersed film; heat-treating the film to form a microparticles-resin film in which the microparticles are regularly arrayed in three-dimensions in a resin matrix; and contacting the microparticles-resin film with an organic acid, water, an alkaline solution or an inorganic acid other than hydrofluoric acid to dissolve and remove the microparticles, or heating the microparticles-resin film to remove the microparticles, to form pores which are in mutual communication and regularly arrayed in the resin matrix. The medium has a resin precursor for the resin matrix and surfaces of the microparticles are inactive against the medium.