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 including a simultaneous controlled machine direction relax.
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申请公布号 |
US2007196638(A1) |
申请公布日期 |
2007.08.23 |
申请号 |
US20070674180 |
申请日期 |
2007.02.13 |
申请人 |
WEI XIANGYUN;HAIRE CHARLES |
发明人 |
WEI XIANGYUN;HAIRE CHARLES |
分类号 |
B29C65/00;B32B3/26;B32B5/14;D01D5/12 |
主分类号 |
B29C65/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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