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:
Mar. 22, 2016
Filed:
Sep. 06, 2012
Satoru Nakamura, Hiroshima, JP;
Yoshiyuki Kushizaki, Hiroshima, JP;
Ryou Ishiguro, Hiroshima, JP;
Mariko Yoshioka, Kyoto, JP;
Satoru Nakamura, Hiroshima, JP;
Yoshiyuki Kushizaki, Hiroshima, JP;
Ryou Ishiguro, Hiroshima, JP;
Mariko Yoshioka, Kyoto, JP;
THE JAPAN STEEL WORKS, LTD., Tokyo, JP;
Abstract
The present invention provides a production method and the like of a microporous stretched film having a high puncture strength and the like. The method includes: a first step of melt-kneading a cellulose nanofiber and a polyolefin resin to thereby disperse the nanofiber in the resin; a second step of removing water from a kneaded mixture obtained in the first step; a third step of mixing a plasticizer in the nanofiber and the resin and melt-kneading them to prepare a polyolefin resin composition; a fourth step of extrusion-molding the polyolefin resin composition; a fifth step of stretching an extrusion-molded article obtained in the fourth step to form a film; and a sixth step of extracting the plasticizer from the film.