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    Method for determining characteristics of super-absorbents
    5.
    发明授权
    Method for determining characteristics of super-absorbents 有权

    公开(公告)号：US11846645B2

    公开(公告)日：2023-12-19

    申请号：US17616705

    申请日：2020-06-24

    Applicant: BASF SE

    Inventor： Thomas Daniel ,  Markus Toennessen ,  Christophe Bauduin

    IPC: G01N5/02 ,  G01N15/08

    CPC classification number: G01N5/02 ,  G01N15/08 ,  G01N2015/0866

    Abstract: In a method of measuring parameters of superabsorbents, the absorption capacity of superabsorbents is determined under pressure, by reducing the pressure applied to a sample of the superabsorbent stepwise and determining the absorption capacity at each pressure. In addition, the rise in absorption capacity after a reduction in pressure is measured as a function of time and this is used to calculate the swelling constant k or the characteristic swelling time τ. Swelling constant or characteristic swelling time or the magnitude of the difference in absorption capacity at two different pressures are used to determine further parameters of the superabsorbent.

    FLUID-ABSORBENT ARTICLE
    7.
    发明申请
    FLUID-ABSORBENT ARTICLE 审中-公开

    公开(公告)号：US20200060897A1

    公开(公告)日：2020-02-27

    申请号：US16482045

    申请日：2018-02-12

    Applicant: BASF SE

    Inventor： Thomas Daniel ,  Christophe Bauduin ,  Katrin Baumann ,  Katarzyna Dobrosielska-Oura

    IPC: A61F13/537 ,  A61L15/60

    Abstract: A fluid-absorbent article includes an upper liquid-pervious layer (A), a lower liquid-impervious layer (B), a fluid-absorbent core (C) between (A) and (B) including at least 60% by weight of non-surface postcrosslinked fluid-absorbent polymer particles and not more than 40% by weight of fibrous material, based on the sum of non-surface postcrosslinked fluid-absorbent polymer particles and fibrous material. An acquisition-distribution layer (D) between (A) and (C) includes at least 90% by weight of synthetic fibers and not more than 10% by weight of cellulose based fibers, based on the sum of synthetic fibers and cellulose based fibers. The basis weight of the acquisition-distribution layer (D) is at least 70 gsm. The fluid-absorbent polymer particles have a saline flow conductivity (SFC) of less than 5×10−7 cm3s/g and an AUHL of less than 15 g/g. Preferably the acquisition-distribution layer (D) is a non-woven web including a three dimensional network of fibers.

    Method for measuring the permeability of superabsorbers
    8.
    发明授权
    Method for measuring the permeability of superabsorbers 有权

    公开(公告)号：US12196660B2

    公开(公告)日：2025-01-14

    申请号：US16968225

    申请日：2019-02-18

    Applicant: BASF SE

    Inventor： Markus Toennessen ,  Marc Haefner ,  Karsten Kraemer ,  Christophe Bauduin ,  Thomas Daniel

    IPC: G01N15/08

    Abstract: A method of measuring indices in superabsorbents, by initially charging excess aqueous solution or dispersion, swelling the superabsorbent in the initially charged aqueous solution or dispersion while stirring, dissolving or dispersing a component A in the aqueous solution or dispersion, measuring the enrichment of component A in the aqueous solution or dispersion during the swelling of the superabsorbent, using the enrichment of component A in the aqueous solution or dispersion to measure the time-dependent swelling characteristics and using these to determine the swelling constant k or the characteristic swell time τ, the index being dependent on the permeability of the superabsorbent, and ascertaining the index by means of a correlation measured beforehand between swelling constant k and index or characteristic swell time τ and index.

    Device and method for producing powdered polymers
    9.
    发明授权
    Device and method for producing powdered polymers 有权

    公开(公告)号：US11332550B2

    公开(公告)日：2022-05-17

    申请号：US16488659

    申请日：2018-02-26

    Applicant: BASF SE

    Inventor： Stephan Bauer ,  Markus Toennessen ,  Christophe Bauduin ,  Katrin Baumann ,  Marco Krüger ,  Andreas Daiss ,  Markus Muehl

    IPC: B01J8/24 ,  B01J19/00 ,  B01J19/18 ,  B01J19/24 ,  C08F2/01 ,  C08F220/14

    Abstract: An apparatus for production of pulverulent polymers having a reactor for droplet polymerization with an apparatus for dropletization of a monomer solution for the preparation of the polymer. The apparatus for dropletization has holes through which the monomer solution is introduced, an addition point for a gas above the apparatus for dropletization, at least one gas withdrawal point at the periphery of the reactor and a fluidized bed, wherein at least one of the following is fulfilled: an apparatus for increasing turbulence in the gas flow is disposed in the region of the apparatus for dropletization of the monomer solution, an apparatus for increasing turbulence in the gas flow is disposed in the region of the addition point for the gas, the addition point for gas is configured such that elevated turbulence is generated. A process for producing pulverulent polymers, in which an increase in flow turbulence in the gas flow in the region of the apparatus for dropletization also is disclosed.

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