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    4.
    发明专利
    未知

    公开(公告)号：ES2079124T3

    公开(公告)日：1996-01-01

    申请号：ES92115391

    申请日：1992-09-09

    Applicant: HOECHST AG

    Inventor： ENGELHARDT FRIEDRICH DR ,  STUVEN UWE ,  MAYER MANFRED DR

    IPC: B01F3/12 ,  B29B7/30 ,  C08F8/00 ,  B29B7/10 ,  C08J3/12 ,  C08J3/20 ,  C08J3/24

    Abstract: The present invention relates to a process for modifying hydrophilic polymers by incorporating a modifier, characterised in that pulverulent polymer and the modifier are introduced continuously into a vertical, cylindrical mixer, mixed at a residence time of 1-10 s and a power of from 1,000 to 5,000 Wh/m powder by means of rotating blades at a blade frequency of from 100 to 300 s , while the powder passes through zones having energy dissipation densities of from 300 to 600 W/l of mixer volume.

    5.
    发明专利
    未知

    公开(公告)号：ES2083059T3

    公开(公告)日：1996-04-01

    申请号：ES92119513

    申请日：1992-11-14

    Applicant: HOECHST AG

    Inventor： KUSSMAUL ULRICH DR ,  STUVEN UWE ,  ENGELHARDT FRIEDRICH DR ,  MAYER MANFRED DR ,  RIEGEL ULRICH

    IPC: A61L15/00 ,  A61L15/60 ,  C08F251/00 ,  C08F283/06

    Abstract: The invention relates to hydrophilic, swellable graft polymers which comprise, in a random distribution, from 0.5 to 50% by weight of radicals of the formula I and radicals of the general formula II from 49 to 99% by weight of acid group-containing radicals of the general formula III and from 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers containing at least two olefinically unsaturated double bonds, where the radicals R to R , X and Y and n and m are defined as indicated in claim 1, to their preparation, and to their use as absorbents for water and aqueous solutions.

    8.
    发明专利
    未知

    公开(公告)号：MX200386B

    公开(公告)日：2001-01-09

    申请号：MX9700495

    申请日：1997-01-17

    Applicant: HOECHST AG

    Inventor： DANIEL THOMAS ,  HERFERT NORBERT ,  REMMEL GUSTAV ,  RIEGEL ULRICH ,  STUVEN UWE ,  ENGELHARDT FRITZ

    IPC: C08J3/00 ,  C08J3/075

    Abstract: Improving the drying properties of hydrophilic, highly swellable hydrogels when using contact driers by use of surfactant is new. Preferably heated rollers are used having a contact surface temperature at least 120 degrees C. Nonionic or anionic surfactants are used, having an HLB at least 3, in amounts of 0.01-5 wt. %, referred to solids content of the hydrogel. The hydrogels are based on (co)polymers of hydrophilic monomers, graft (co)polymers of hydrophilic monomers on a suitable graft base, crosslinked cellulose or starch ethers or natural products swellable in aqueous liquids, e.g. guar derivatives, optionally chemically modified.

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