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    43.
    发明专利
    未知

    公开(公告)号：AT501178T

    公开(公告)日：2011-03-15

    申请号：AT07820798

    申请日：2007-10-02

    Applicant: BASF SE

    Inventor： LOESCH DENNIS ,  WEISMANTEL MATTHIAS ,  KRUEGER MARCO ,  ZIEMER ANTJE

    IPC: C08F2/00 ,  A61L15/60 ,  C08F2/10 ,  C08F2/16 ,  C08F2/18

    Abstract: A process for preparing water-absorbing polymer beads by polymerizing droplets comprising at least one monomer in a gas phase surrounding the droplets, the droplets being obtained by enveloping a first monomer solution with a second monomer solution and polymerizing the second monomer solution and polymerizing to give a more highly crosslinked polymer than the first monomer solution.

    45.
    发明专利
    未知

    公开(公告)号：AT496945T

    公开(公告)日：2011-02-15

    申请号：AT06725287

    申请日：2006-03-23

    Applicant: BASF SE

    Inventor： WEISMANTEL MATTHIAS ,  BRUHNS STEFAN ,  VAN ESBROECK DOMINICUS

    IPC: C08F2/04 ,  A61L15/12 ,  C08F6/10 ,  C08F20/06 ,  C08J3/075 ,  F26B17/00

    Abstract: Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the gas inlet temperature (T n) is not equal to T n + a; and flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. n : index; and a : greater than 0. An independent claim is included for a device for drying (A) comprising a gas permeable conveyer belt (which is streamed by a preheated gas), where the gas inlet temperature is adjusted such that it can come form at least two temperature zones.

    48.
    发明专利
    未知

    公开(公告)号：DE502006005477D1

    公开(公告)日：2010-01-07

    申请号：DE502006005477

    申请日：2006-12-28

    Applicant: BASF SE

    Inventor： STUEVEN UWE ,  DANIEL THOMAS ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS ,  VAN ESBROECK DOMINICUS ,  POSSEMIERS KARL ,  HILLEBRECHT ANNEMARIE

    IPC: C08F2/00 ,  C08F2/44

    Abstract: Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor. Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, in a reactor, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor, where: the additive is a water-adsorbing resin powder and/or filler; the total solid content of the monomer and additive is 30-60 wt.%; the amount of the additive is 5-50 wt.%, based on the monomer; and the weight ratio of the first fraction to the second fraction of the additive is 10:10-1:5.

    49.
    发明专利
    未知

    公开(公告)号：AT449793T

    公开(公告)日：2009-12-15

    申请号：AT06830841

    申请日：2006-12-28

    Applicant: BASF SE

    Inventor： STUEVEN UWE ,  DANIEL THOMAS ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS ,  VAN ESBROECK DOMINICUS ,  POSSEMIERS KARL ,  HILLEBRECHT ANNEMARIE

    IPC: C08F2/00 ,  C08F2/44

    Abstract: Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor. Preparation of water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, in a reactor, comprises mixing at least a first portion of a particulate additive in the reaction mixture, before the reaction mixture reaches a retention time of 40% of the total retention time in the reactor; and mixing at least a second portion of a particulate additive in the reaction mixture, when the reaction mixture reaches a retention time of 45% or more of the total retention time in the reactor, where: the additive is a water-adsorbing resin powder and/or filler; the total solid content of the monomer and additive is 30-60 wt.%; the amount of the additive is 5-50 wt.%, based on the monomer; and the weight ratio of the first fraction to the second fraction of the additive is 10:10-1:5.

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