Method for production of porous film, porous film, separator for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using the separator

摘要

The method for producing a porous film of the present invention includes producing a stretched film by stretching a resin sheet containing at least polyolefin, and then irradiating the stretched film with a vacuum ultraviolet ray. The separator for a non-aqueous electrolyte battery of the present invention is composed of the porous film obtained by the production method of the present invention. The non-aqueous electrolyte battery of the present invention is provided with the separator for a non-aqueous electrolyte battery of the present invention.

主权项

1. A method for producing a porous film treated with ultraviolet ray, comprising:
producing a stretched porous film by a process comprising:
stretching a resin sheet comprising at least polyolefin; andremoving solvent so as to form a porous structure in the porous film; andthen irradiating the stretched porous film with a vacuum ultraviolet ray, wherein the vacuum ultraviolet ray is irradiated directly on the stretched porous film, wherein the resin sheet is produced by a process comprising:
mixing a resin composition comprising a resin component with the solvent so that a content of the resin component in a mixture of the resin composition and the solvent is 5 wt % to 30 wt %;kneading the mixture;molding the kneaded mixture into a sheet shape while heat-melting the kneaded mixture; andcooling and solidifying a molded product to produce the resin sheet.