Multilayer microporous membrane

Details Multilayer microporous membrane Multilayer microporous membrane

2006-11-28

2006-11-28

Vo, Hai (Department: 1771)

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

C210S500270, C210S500420, C428S310500, C428S311510, C428S315500, C428S315700

Reexamination Certificate

active

07140496

ABSTRACT:
A multilayer microporous membrane containing a thermoplastic resin, comprising a coarse structure layer with a higher open pore ratio and a fine structure layer with a lower open pore ratio, wherein said coarse structure layer is present at least in one membrane surface having a thickness of not less than 5.0 μm, a thickness of said fine structure layer is not less than 50% of the whole membrane thickness, and said coarse structure layer and said fine structure layer are formed in one-piece.

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