The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2005
Filed:
Oct. 28, 2002
James Huang, Taichung, TW;
William Chou, Taichung, TW;
David Chou, Taichung, TW;
Juin-yih Lai, Chung-Li, TW;
Kueir-rarn Lee, Chung-Li, TW;
Da-ming Wang, Chung-Li, TW;
Ruoh-chyu Ruaan, Chung-Li, TW;
Tian-tsair Wu, Chung-Li, TW;
James Huang, Taichung, TW;
William Chou, Taichung, TW;
David Chou, Taichung, TW;
Juin-Yih Lai, Chung-Li, TW;
Kueir-Rarn Lee, Chung-Li, TW;
Da-Ming Wang, Chung-Li, TW;
Ruoh-Chyu Ruaan, Chung-Li, TW;
Tian-Tsair Wu, Chung-Li, TW;
Yeu Ming Tai Chemical Industrial Co., Ltd., Taichung, TW;
Abstract
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 μm; 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.