Vinylidene fluoride based resin porous hollow yarn and...

Details Vinylidene fluoride based resin porous hollow yarn and... Vinylidene fluoride based resin porous hollow yarn and...

2004-09-24

2009-08-04

Fortuna, Ana M (Department: 1797)

Liquid purification or separation

Filter

Material

C210S500420, C210S500270, C210S500230, C264S041000, C264S17800F, C264S184000, C264S209500, C428S316600

Reexamination Certificate

active

07569145

ABSTRACT:
There is provided a porous hollow fiber of vinylidene fluoride resin which has a water permeation rate that is large per fiber and little dependent on the length, has a large treatment capacity per volume of a filtering module, and is therefore suitable as a microfilter element. That is, a porous hollow fiber, comprising a vinylidene fluoride resin having a weight-average molecular weight of at least 3×105, having a water permeation rate F (m3/m2·day) measured at a pressure difference of 100 kPa and at a water temperature of 25° C. in a range of test length L=0.2-0.8 (m) and expressed in a linear relationship with the test length L of: F=C·L+F0(formula 1) and satisfying requirements (a)-(d) shown below: (a) a average slope C (/day) of: −20≦C≦0, (b) an intercept (basic permeability) F0(m3/m2·day) of: F0≧30, (c) a relation between F0(m3/m2·day) and an average pore diameter P (μm) according to half-dry method of F0/P≧300, and (d) an outer diameter of at most 3 mm.

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Supplementary European Search Report dated Jul. 4, 2008 issued in connection with European Application No. 04 77 3504 corresponding to the present U.S. application.
English translation of International Preliminary Report on Patentability for PCT/JP2004/014416.

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