Kureha Corporation

Kosuke Abe

Takeo Takahashi

Toshiya Mizuno

Yasuhiro Tada

Masayuki Hino

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&#xd7;10, having a water permeation rate F (m/m&#xb7;day) measured at a pressure difference of 100 kPa and at a water temperature of 25&#xb0; 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&#xb7;L+F(formula 1) and satisfying requirements (a)-(d) shown below: (a) a average slope C (/day) of: &#x2212;20&#x2266;C&#x2266;0, (b) an intercept (basic permeability) F(m/m&#xb7;day) of: F&#x2267;30, (c) a relation between F(m/m&#xb7;day) and an average pore diameter P (&#x3bc;m) according to half-dry method of F/P&#x2267;300, and (d) an outer diameter of at most 3 mm.

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Ibaraki-ken, Japan

Kosuke Abe