Liquid purification or separation – Filter – Material
Reexamination Certificate
2005-06-08
2008-11-25
Fortuna, Ana M (Department: 1797)
Liquid purification or separation
Filter
Material
C210S500270, C210S500420, C210S500230, C428S315500, C264S041000, C264S177140, C264S177130
Reexamination Certificate
active
07455772
ABSTRACT:
A vinylidene fluoride resin having a weight-average molecular weight as relatively high as 300,000 or higher is mixed with a plasticizer and good solvent for the vinylidene fluoride resin to obtain a composition. A molten extrudate of the composition in a hollow-fiber membrane state is contacted, on its outer side, with a cooling liquid inert to the vinylidene fluoride resin to thereby cool the extrudate. During the solidification, the vinylidene fluoride resin is moderately and mildly crystallized. Thus, a hollow-fiber porous vinylidene fluoride resin membrane is produced which has a high crystallinity represented by an enthalpy of crystal melting 58 J/g or higher. The hollow-fiber porous membrane obtained is excellent in mechanical strength represented by tensile strength and elongation at break and in chemical resistance. It is effectively used as a water microfiltration membrane.
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Hino Masayuki
Mizuno Toshiya
Suzuki Ken'ichi
Tada Yasuhiro
Takahashi Takeo
Fortuna Ana M
Kureha Corporation
Wenderoth , Lind & Ponack, L.L.P.
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