发明名称 |
BIAXIALLY ORIENTED MICROPOROUS MEMBRANE |
摘要 |
A microporous membrane is made by a dry-stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 5.0. The method of making the foregoing microporous membrane includes the steps of: extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction stretching including a simultaneous controlled machine direction relax. |
申请公布号 |
US2014287322(A1) |
申请公布日期 |
2014.09.25 |
申请号 |
US201414297688 |
申请日期 |
2014.06.06 |
申请人 |
Celgard LLC |
发明人 |
Wei Xiangyun;Haire Charles |
分类号 |
C08F110/06;H01M2/16;B29C55/00 |
主分类号 |
C08F110/06 |
代理机构 |
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代理人 |
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主权项 |
1. A method of making a microporous membrane comprising the steps of:
extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction stretching including a simultaneous controlled machine direction relax. |
地址 |
Charlotte NC US |