logo

For the Inventor, By the Inventor

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.:

US 11344848 B1

PDFFull Text
Date of Patent:
May. 31, 2022

Filed:

Jul. 23, 2020

Porous film and method for producing same

Applicant:

Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;

Inventor:

Tsukasa Sugawara, Kanagawa, JP;

Assignee:

TOKYO OHKA KOGYO CO., LTD., Kanagawa, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

Pamela H Weiss

Int. Cl.
CPC ...
B01D 67/00 (2006.01); B01D 71/34 (2006.01); B01D 71/64 (2006.01); B01D 71/68 (2006.01); C08J 9/26 (2006.01); C08J 9/00 (2006.01); H01M 50/411 (2021.01); H01M 50/446 (2021.01); B01D 69/02 (2006.01); B01D 69/12 (2006.01); H01M 10/0525 (2010.01);
U.S. Cl.
CPC ...
B01D 67/003 (2013.01); B01D 67/002 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 71/34 (2013.01); B01D 71/64 (2013.01); B01D 71/68 (2013.01); C08J 9/0066 (2013.01); C08J 9/26 (2013.01); H01M 50/411 (2021.01); H01M 50/446 (2021.01); B01D 2325/021 (2013.01); C08J 2201/044 (2013.01); C08J 2327/16 (2013.01); C08J 2379/08 (2013.01); C08J 2381/06 (2013.01); H01M 10/0525 (2013.01);
Abstract

Provided are a porous film having excellent surface smoothness and a method for producing the same. The surface roughness of a porous film of polyvinylidene fluoride, polyethersulfone, polyimide and/or polyamide-imide is Ra 30,000 Å or less. The opening diameter of the porous film is preferably from 100 nm to 5000 nm. The method for producing a porous film preferably includes a step for kneading a varnish containing fine particles and at least one resin selected from the group consisting of polyvinylidene fluoride, polyether sulfone, polyamic acid, polyimide, polyamide-imide precursor, and polyamide-imide. The varnish preferably has a viscosity at 25° C. of 0.1-3 Pa·s, a solids fraction concentration of 10-50 mass %, and a fine particle average particle size of 10-5000 nm.

Find Patent Forward Citations

Loading…