Liquid purification or separation – Filter – Material
Reexamination Certificate
2011-01-11
2011-01-11
Fortuna, Ana M (Department: 1797)
Liquid purification or separation
Filter
Material
C210S500270, C264S041000, C264S650000, C264S17800F, C429S128000, C429S120000, C428S305500, C428S332000
Reexamination Certificate
active
07866487
ABSTRACT:
The problem addressed by this invention is to provide an aromatic polyamide porous film excellent in the capability of being thinned and capable of easily exhibiting stable porosity properties even if it is used for a long period of time at high temperature. This invention can be achieved by an aromatic polyamide porous film that contains an aromatic polyamide as a main component and is such that when an atomic force microscope is used to measure a range of S μm2at least on one surface, the sectional area S(10) μm2obtained at a depth of 10 nm from the surface and the sectional area S(20) μm2obtained at a depth of 20 nm from the surface satisfy the following formulae simultaneously.in-line-formulae description="In-line Formulae" end="lead"?0.01≦S(10)/S≦0.3in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?5≦S(20)/S(10)≦20in-line-formulae description="In-line Formulae" end="tail"?
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Nishihara Kenta
Sueoka Masanori
Tsukuda Akimitsu
Birch & Stewart Kolasch & Birch, LLP
Fortuna Ana M
Toray Industries Inc.
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