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 10633498 B1

PDFFull Text
Date of Patent:
Apr. 28, 2020

Filed:

Feb. 25, 2016

Method for manufacturing microporous film and microporous film

Applicant:

The Japan Steel Works, Ltd., Shinagawa-ku, Tokyo, JP;

Inventors:

Ryou Ishiguro, Hiroshima, JP;

Satoru Nakamura, Hiroshima, JP;

Mariko Yoshioka, Kyoto, JP;

Assignee:

THE JAPAN STEEL WORKS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Kara B Boyle

Int. Cl.
CPC ...
B29C 55/00 (2006.01); B29C 55/14 (2006.01); B29C 55/18 (2006.01); C08J 5/18 (2006.01); B29C 48/00 (2019.01); C08K 5/20 (2006.01); H01M 2/16 (2006.01); C08L 23/12 (2006.01); C08J 9/00 (2006.01); C08L 1/02 (2006.01); B29C 55/12 (2006.01); B29C 48/08 (2019.01); B29K 23/00 (2006.01); B29K 105/04 (2006.01); B29K 105/16 (2006.01); B29K 401/00 (2006.01);
U.S. Cl.
CPC ...
C08J 5/18 (2013.01); B29C 48/0018 (2019.02); B29C 55/12 (2013.01); C08J 9/00 (2013.01); C08K 5/20 (2013.01); C08L 1/02 (2013.01); C08L 23/12 (2013.01); H01M 2/16 (2013.01); B29C 48/08 (2019.02); B29K 2023/12 (2013.01); B29K 2105/041 (2013.01); B29K 2105/162 (2013.01); B29K 2401/00 (2013.01); C08J 2323/12 (2013.01); C08J 2401/02 (2013.01);
Abstract

The present invention provides a method for producing a microporous film, including: preparing a resin composition containing polypropylene (PP) as a resin component and containing from 0.01 to 20 parts by weight of a chemically modified cellulose or chemically modified cellulose nanofiber per 100 parts by weight of the resin component and from 0.01 to 3 parts by weight of a β-crystal nucleating agent per 100 parts by weight of the resin component; melt-molding the resin composition into a film-like material in which the crystal phase of a polypropylene component in the resin composition is substantially a β-crystal phase, and subsequently stretching the film-like material at a temperature of 60 to 160° C., and provides a microporous film.

Find Patent Forward Citations

Loading…