Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Reexamination Certificate
2004-07-28
2010-12-14
Johnson, Christina (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
Reexamination Certificate
active
07850881
ABSTRACT:
The invention relates to inorganic hollow fibers, to a spinning mass and to a method for producing the same as well as to the use thereof for material transports, for the exchange of gases and in separation procedures. The hollow fibers according to the invention are obtainable by processing a spinning mass to a hollow fiber according to general methods, by curing said fiber thermally, via radiation induction or via chemical induction, and by removing the organic components via pyrolysis. The spinning mass is obtained by hydrolytic polycondensation of hydrolyzable compounds of silicon, aluminum, titanium and zirconium and optionally of co-condensable compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb. The hydrolytic polycondensation is performed by adding water or moisture. If desired, monomers or oligomers which may undergo co-polymerization or (poly)addition, curing catalysts, pore generating additives or compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn and Pb which are soluble in the reaction medium are added to the spinning mass.
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Ballweg Thomas
Storch Werner
Wolter Herbert
Butler Patrick
Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung
Hunton & Williams LLP
Johnson Christina
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