Patent ID: 9293751
Filing Date: 2016-03-22
CPC Classification: B29C,B82Y,C08J,H01M,Y02E

Claim Text:
1. A method for producing a microporous stretched polyolefin film containing a cellulose nanofiber, the method comprising: a first step of melt-kneading a surface-monoesterified cellulose nanofiber in an aqueous slurry and a polyolefin resin to thereby disperse the cellulose nanofiber in a polyolefin 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 cellulose nanofiber and the polyolefin 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.