发明名称 |
Asymmetric porous polytetrafluoroethylene membrane and process for preparing the same |
摘要 |
The present invention relates to an asymmetric porous polytetrafluoroethylene membrane comprising a dense skin layer and a continuously foamed porous layer, (1) the dense skin layer having a surface roughness Ra of 20 to 165 nm; (2) the dense skin layer having a contact angle for water of 120 to 135°; (3) the porous layer having a maximum pore diameter of 0.03 to 1.0 mum; and (4) the membrane having a total porosity of 20 to 70%. The asymmetric porous PTFE membrane has an ability to separate each liquid component from a liquid-liquid homogeneous mixture in addition to known properties such as water permeability resistance, gas permeability, sealing property and electric property, wherein change of these properties over time is small.
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申请公布号 |
US6852223(B2) |
申请公布日期 |
2005.02.08 |
申请号 |
US20020281311 |
申请日期 |
2002.10.28 |
申请人 |
YEU MING TAI CHEMICAL INDUSTRIAL CO., LTD. |
发明人 |
HUANG JAMES;CHOU WILLIAM;CHOU DAVID;LAI JUIN-YIH;LEE KUEIR-RARN;WANG DA-MING;RUAAN RUOH-CHYU;WU TIAN-TSAIR |
分类号 |
B01D61/36;B01D67/00;B01D69/02;B01D71/36;B29C55/02;B29C55/12;B29C55/18;B29C67/20;B29K27/18;B32B5/32;B32B27/30;C08J9/00;C08J9/36;(IPC1-7):B01D71/36 |
主分类号 |
B01D61/36 |
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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