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US 2016/0079580 A1Published application
Olefin resin microporous film, separator for batteries, battery, and method of producing olefin resin microporous film
AssigneeSekisui Chemical Co., Ltd.
InventorTakahiko SAWADA
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Abstract
An olefin resin microporous film of the present invention is an olefin resin stretched film that contains an olefin resin and is characterized by having a long period of 27 nm or more measured by a small angle X-ray scattering method.
Claims11
An olefin resin microporous film comprising an olefin resin stretched film that contains an olefin resin, the olefin resin microporous film having a long period of 27 nm or more measured by a small angle X-ray scattering method.
A method of producing an olefin resin microporous film, comprising:
- an extrusion step of supplying an olefin resin to an extruder, melt-kneading the olefin resin, and extruding the olefin resin through a die attached to a tip of the extruder to obtain an olefin resin film;
- a first aging step of aging the olefin resin film obtained in the extrusion step;
- a stretching step of uniaxially stretching the olefin resin film after the first aging step to obtain an olefin resin stretched film;
- and
- a second aging step of aging the olefin resin stretched film after the stretching step, at an aging temperature T1 that satisfies the formula (1), while adjusting shrinkage ratios in a length direction and in a width direction to be 10% or lower each,
- (a melting point of the olefin resin−10° C.)≦aging temperature T1≦(an extrapolation melting finishing temperature [Tem] of the olefin resin) formula (1).
3 more elements
Dependencies are inferred from the claim text.