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:
Feb. 02, 2016
Filed:
Mar. 15, 2013
Mitsubishi Plastics, Inc., Chiyoda-ku, JP;
Hiroto Yamada, Nagahama, JP;
Tomoyuki Nemoto, Nagahama, JP;
MITSUBISHI PLASTICS, INC., Chiyoda-ku, JP;
Abstract
Provided is a multilayer porous film that has extremely high powder fall-off resistance and superior electrolyte solution adsorptivity and heat resistance and exhibits superior properties when used as a battery separator without decreasing the high air permeability of a porous film. The multilayer porous film includes a polyolefin-based resin porous film and a coating layer containing a filler and a resin binder on at least one surface of the polyolefin-based resin porous film. The amount of particles with particle sizes of less than 0.2 μm (D) in the filler is 1% or more, and the specific surface area of the filler is 5 m/g or more and less than 10 m/g. The multilayer porous film satisfies a particular condition.