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公开(公告)号：BRPI0815765A2
公开(公告)日：2014-10-21
申请号：BRPI0815765
申请日：2008-08-25
Applicant: BASF SE
Inventor： LOESCH DENNIS , KRUEGER MARCO , STUEVEN UWE , HEIDE WILFRIED , WEISMANTEL MATTHIAS , BLEI STEFAN
Abstract: A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the monomer solution comprises at least 0.0002% by weight of oxygen and the oxygen content of the gas phase is at least 0.5% by volume.
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公开(公告)号：BRPI0714445A2
公开(公告)日：2013-03-12
申请号：BRPI0714445
申请日：2007-07-11
Applicant: BASF SE
Inventor： STUEVEN UWE , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO , SEIDL VOLKER , BLEI STEFAN , LOESCH DENNIS , FUNK RUEDIGER , HILLEBRECHT ANNEMARIE
Abstract: A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the monomer solution comprises at least 0.5% by weight of a crosslinker, based on the monomer, the polymerization in the droplet takes place in homogeneous phase, and the polymer beads have a mean diameter of at least 150 μm.
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公开(公告)号：AT529449T
公开(公告)日：2011-11-15
申请号：AT08787056
申请日：2008-08-08
Applicant: BASF SE
Inventor： FUNK RUEDIGER , HEIDE WILFRIED , WEISMANTEL MATTHIAS , HAMMON ULRICH , BENNET ANDREA KAREN
Abstract: What is described is a process for producing water-absorbing resins, in which a) acrylic acid is prepared at an acrylic acid production site, b) the acrylic acid prepared is dissolved in water at the acrylic acid production site to obtain an aqueous acrylic acid solution, c) the aqueous acrylic acid solution is fed into a pipeline at the acrylic acid production site and passed through the pipeline to an acrylic acid processing site and d) the aqueous acrylic acid solution is subjected to a free-radical polymerization at the acrylic acid processing site. The process ensures safe transport of the highly reactive acrylic acid. Endangerment as a result of premature polymerization, as in the case of glacial acrylic acid, is ruled out, since the acrylic acid is “diluted” by the aqueous solvent and the specific heat capacity and the evaporation enthalpy of the water limit the maximum temperature rise. The amount of polymerization inhibitors used be reduced or it is possible to entirely dispense with polymerization inhibitors. Temperature control of vessels and pipelines within which the aqueous acrylic acid solution is conducted can be dispensed with because the solidification point of the aqueous acrylic acid solution is lower than that of anhydrous acrylic acid.
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公开(公告)号：AT517928T
公开(公告)日：2011-08-15
申请号：AT07848074
申请日：2007-12-12
Applicant: BASF SE
Inventor： STUEVEN UWE , FUNK RUEDIGER , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO
Abstract: A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets and postcrosslinking the polymer particles, wherein the postcrosslinked polymer particles are at least partly coated.
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公开(公告)号：AT499954T
公开(公告)日：2011-03-15
申请号：AT08803174
申请日：2008-08-25
Applicant: BASF SE
Inventor： LOESCH DENNIS , KRUEGER MARCO , STUEVEN UWE , HEIDE WILFRIED , WEISMANTEL MATTHIAS , BLEI STEFAN
Abstract: A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the monomer solution comprises at least 0.0002% by weight of oxygen and the oxygen content of the gas phase is at least 0.5% by volume.
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Patent Agency Ranking
公开(公告)号：AT467645T
公开(公告)日：2010-05-15
申请号：AT07787356
申请日：2007-07-11
Applicant: BASF SE
Inventor： STUEVEN UWE , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO , SEIDL VOLKER , BLEI STEFAN , LOESCH DENNIS , FUNK RUEDIGER , HILLEBRECHT ANNEMARIE
Abstract: A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution, comprising monomers bearing acid groups, in a gas phase surrounding the droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 μm.
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公开(公告)号：ZA200901113B
公开(公告)日：2010-04-28
申请号：ZA200901113
申请日：2009-02-17
Applicant: BASF SE
Inventor： HILLEBRECHT ANNEMARIE , STUEVEN UWE , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO , SEIDL VOLKER , BLEI STEFAN , LOESCH DENNIS , FUNK RUEDIGER
IPC: A61L20100101 , C08F20100101 , C08J20100101
Abstract: A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein a water-insoluble inorganic salt is suspended in the monomer solution and the polymer beads have a mean diameter of at least 150 μm.
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公开(公告)号：BRPI0814746A2
公开(公告)日：2015-03-03
申请号：BRPI0814746
申请日：2008-08-08
Applicant: BASF SE
Inventor： FUNK RUEDIGER , HEIDE WILFRIED , WEISMANTEL MATTHIAS , HAMMON ULRICH , BENNETT ANDREA KAREN
Abstract: What is described is a process for producing water-absorbing resins, in which a) acrylic acid is prepared at an acrylic acid production site, b) the acrylic acid prepared is dissolved in water at the acrylic acid production site to obtain an aqueous acrylic acid solution, c) the aqueous acrylic acid solution is fed into a pipeline at the acrylic acid production site and passed through the pipeline to an acrylic acid processing site and d) the aqueous acrylic acid solution is subjected to a free-radical polymerization at the acrylic acid processing site. The process ensures safe transport of the highly reactive acrylic acid. Endangerment as a result of premature polymerization, as in the case of glacial acrylic acid, is ruled out, since the acrylic acid is “diluted” by the aqueous solvent and the specific heat capacity and the evaporation enthalpy of the water limit the maximum temperature rise. The amount of polymerization inhibitors used be reduced or it is possible to entirely dispense with polymerization inhibitors. Temperature control of vessels and pipelines within which the aqueous acrylic acid solution is conducted can be dispensed with because the solidification point of the aqueous acrylic acid solution is lower than that of anhydrous acrylic acid.
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公开(公告)号：BRPI0720482A2
公开(公告)日：2014-01-14
申请号：BRPI0720482
申请日：2007-12-12
Applicant: BASF SE
Inventor： STUEVEN UWE , FUNK RUEDIGER , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO
Abstract: A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets and postcrosslinking the polymer particles, wherein the postcrosslinked polymer particles are at least partly coated.
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公开(公告)号：BRPI0714444A2
公开(公告)日：2013-03-19
申请号：BRPI0714444
申请日：2007-07-12
Applicant: BASF SE
Inventor： STUEVEN UWE , WEISMANTEL MATTHIAS , HEIDE WILFRIED , KRUEGER MARCO , SEIDL VOLKER , BLEI STEFAN , LOESCH DENNIS , FUNK RUEDIGER , HILLEBRECHT ANNEMARIE
Abstract: A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein a water-insoluble inorganic salt is suspended in the monomer solution and the polymer beads have a mean diameter of at least 150 μm.
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