US 2003/0118502 A1Published application

Inorganic hollow fibers

OwnerHerbert Wolter, Werner Storch +1inventors

InventorsHerbert Wolter, Werner Storch, Thomas Ballweg

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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.

Claims17

Dependent claims

Inorganic hollow fiber, obtainable by processing of a spin mass to a hollow fiber according to general methods, by optionally drying the hollow fiber, by curing the optionally dried fiber thermally and/or via radiation induction and/or chemically induced by polymerization and/or polyaddition, and by removal of the organic components from the cured hollow fiber via pyrolysis, wherein the spinning mass is obtained

a) by hydrolytic polycondensation of
one or more compounds of the general formula I and/or of precondensates derived therefrom,
SiXaR′bR(4-a-b) (I)
wherein the radicals and indices have the following meaning:
R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl having from 1 to 20 carbon atoms each, wherein said radicals may contain oxygen and/or sulfur atoms and/or ester and/or carbonyl and/or carboxy and/or amide and/or amino groups,
R′=organic radical having from 1 to 50 carbon atoms and containing at least one group which can undergo a polymerization or a polyaddition,
X=hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR″2, wherein R″=hydrogen, alkyl or aryl,
a=1, 2 or 3,
b=1, 2 or 3, with the proviso that a+b=2, 3 or 4,
and one or more compounds of the general formulae II and/or III which is/are optionally in the form of (a) complex(es) and/or of precondensates derived thereof,
M1Ro3 (II) M2XyRz (III)
wherein M1 is aluminum or boron and M2 is titanium or zirconium, the radicals X, Ro and R are equal or different, Ro is halogen, hydroxy, alkoxy or acyloxy, y is an integer of from 1 to 4, z is 0, 1, 2, or 3 under the proviso that y+z=4, and X and R are defined as in formula I,
and optionally
one or more compounds of the general formula IV and/or of precondensates derived therefrom,
XaSiR4-a (IV)
wherein the radicals and indices have the following meaning:
R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl having from 1 to 20 carbon atoms each, wherein said radicals may contain oxygen and/or sulfur atoms and/or ester and/or carbonyl and/or carboxy and/or amide and/or amino groups,
X=hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl, or NR″2
wherein R″=hydrogen, alkyl, aryl, or alkylaryl,
a=1, 2 or 3,
and/or
one or more co-condensable compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb,
wherein the hydrolytic polycondensation has been carried out by adding water or moisture and optionally in the presence of a solvent and/or of a condensation catalyst, and wherein the molar ratio of the compound of formula I to the sum of compounds of formulae II and III, based on the monomers, is between 99:1 and 1:99,
and, if desired
b) by addition of
one or more monomers and/or oligomers which are co-polymerizable and/or can be subjected to a (poly)addition,
and/or one or more curing catalysts,
and/or one or more pore generating additives
and/or one or more compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn and Pb which are soluble in the reaction medium.

26 more elements

Spinning mass for the preparation of inorganic hollow fibers, obtainable by

a) by hydrolytic polycondensation of
one or more compounds of the general formula I and/or of precondensates derived from said compounds,
SiXaR′bR(4-a-b) (I)
wherein the radicals and indices have the following meaning:
R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl having from 1 to 20 carbon atoms each, wherein said radicals may contain oxygen and/or sulfur atoms and/or ester and/or carbonyl and/or carboxy and/or amide and/or amino groups,
R′=organic radical having from 1 to 50 carbon atoms and containing at least one group which can undergo a polymerization or a polyaddition,
X=hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR″2, wherein R″=hydrogen, alkyl or aryl,
a=1, 2 or 3,
b=1, 2 or 3, with the proviso that a+b=2, 3 or 4,
and one or more compounds of the general formulae II and/or III which is/are optionally in the form of (a) complex(es) and/or of precondensates derived thereof,
M1Ro3 (II) M2XyRz (III)
wherein M1 is aluminum or boron and M2 is titanium or zirconium, the radicals X, Ro and R are equal or different, Ro is halogen, hydroxy, alkoxy or acyloxy, y is an integer of from 1 to 4, z is 0, 1, 2, or 3 under the proviso that y+z=4, and X and R are defined as in formula I,
and optionally
one or more compounds of the general formula IV and/or of precondensates derived therefrom,
XaSiR4-a (IV)
wherein the radicals and indices have the following meaning:
R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl having from 1 to 20 carbon atoms each, wherein said radicals may contain oxygen and/or sulfur atoms and/or ester and/or carbonyl and/or carboxy and/or amide and/or amino groups,
X=hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR″2,
wherein R″=hydrogen, alkyl, aryl or alkylaryl,
a=1, 2 or 3,
and/or
one or more co-condensable compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb,
wherein the hydrolytic polycondensation has been carried out by adding water or moisture and, optionally, in the presence of a solvent and/or of a condensation catalyst and wherein the molar ratio of the compound of formula I to the sum of the compounds of formulae II and III is between 99:1 and 1:99, based on the monomers,
and, if desired,
b) by addition of
one or more monomers and/or oligomers which are co-polymerizable and/or can be subjected to a (poly)addition,
and/or one or more curing catalysts,
and/or one or more pore generating additives,
and/or one or more compounds of the elements Li, Na, Mg, Ca, Sr, Ba, Zn, Sn and Pb which are soluble in the reaction medium.

26 more elements

Dependencies are inferred from the claim text.