Title:
微多孔膜製造方法、微多孔膜、電池用セパレータ及び二次電池
Document Type and Number:
Japanese Patent JP6859952
Kind Code:
B2
Abstract:
An object of the present invention is to provide a polyolefin microporous membrane having excellent strength, permeability and heat resistance, which is obtained by using UHMwPE and employing a sequential stretching system, and a production method of the microporous membrane. In producing a microporous membrane by using a primary material A having a molecular weight (Mw) of less than 1.0×10 6 , a secondary material B having a molecular weight of 1.0×10 6 or more, and a plasticizer, when the endothermic quantity of a mixture of the primary material and the plasticizer and the endothermic quantity of a mixture of the secondary material and the plasticizer are denoted as Q1 and Q2, respectively, respective resins are designed such that the ratio of endothermic quantity Q2 to endothermic quantity Q1 (endothermic quantity Q2/endothermic quantity Q1) becomes 1 or more over a temperature range from 110 to 118°C.
Inventors:
Naoki Toyoda
Mayumi Yoshida
Mayumi Yoshida
Application Number:
JP2017521974A
Publication Date:
April 14, 2021
Filing Date:
June 01, 2016
Export Citation:
Assignee:
TORAY INDUSTRIES,INC.
International Classes:
C08J9/26; B29C67/20; C08J9/00; H01M50/403; H01M50/406; H01M50/409; H01M50/417
Domestic Patent References:
| JP2013530261A | ||||
| JP2015092488A |
Foreign References:
| WO2015029944A1 |
Attorney, Agent or Firm:
Patent business corporation glory patent office