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    METHOD FOR PREPARING SUPERABSORBENT POLYMER
    4.
    发明公开
    METHOD FOR PREPARING SUPERABSORBENT POLYMER 审中-公开

    公开(公告)号：EP3783053A1

    公开(公告)日：2021-02-24

    申请号：EP19893049.7

    申请日：2019-10-01

    申请人： LG CHEM, LTD.

    发明人： WON, Tae Young ,  SOHN, Jungmin ,  LEE, Hyemin ,  LEE, Junwye ,  HEO, Seongbeom ,  SHIN, Kwangin ,  HAN, Chang Hun

    IPC分类号： C08J9/12 ,  C08J9/16 ,  C08J3/12 ,  C08J3/24 ,  C08F2/01

    摘要： The present disclosure relates to a preparation method of a super absorbent polymer capable of preparing a super absorbent polymer exhibiting an improved absorption rate while reducing an amount of a blowing agent used. The preparation method of a super absorbent polymer includes the steps of: preparing a monomer mixture including a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups and an internal cross-linking agent; adjusting a dynamic pressure applied to the monomer mixture being transferred to 140 Pa or more by controlling a transfer rate while transferring the monomer mixture to a polymerization reactor; cross-linking and polymerizing the monomer mixture transferred to the polymerization reactor to form a hydrogel polymer; drying, pulverizing and classifying the hydrogel polymer to form a base resin powder; and further cross-linking a surface of the base resin powder in the presence of a surface cross-linking agent to form a surface cross-linked layer.

    SUPERABSORBENT RESIN AND PREPARATION METHOD OF SAME
    7.
    发明公开
    SUPERABSORBENT RESIN AND PREPARATION METHOD OF SAME 审中-公开

    公开(公告)号：EP3819330A1

    公开(公告)日：2021-05-12

    申请号：EP19908136.5

    申请日：2019-12-20

    申请人： LG Chem, Ltd.

    发明人： LEE, Hyemin ,  WON, Tae Young ,  SOHN, Jungmin ,  LEE, Junwye ,  HEO, Seongbeom ,  SHIN, Kwangin ,  HAN, Chang Hun

    IPC分类号： C08J3/24 ,  C08J3/12 ,  C08K5/00 ,  C08F2/01

    摘要： The present disclosure relates to a super absorbent polymer and a preparation method of the same, which not only has excellent basic absorption performance, but also exhibits an improved absorption rate, and the like. The super absorbent polymer includes a base resin powder containing a first cross-linked polymer of a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer containing a second cross-linked polymer in which the first cross-linked polymer is additionally cross-linked by a surface cross-linking agent on the base resin powder, wherein the super absorbent polymer contains less than 9.9% by number of super absorbent polymer particles having an aspect ratio, which is defined as shortest diameter/longest diameter of each super absorbent polymer particle, of less than 0.5, a vortex time is 5 to 55 seconds by a vortex method, and a surface tension is 50 to 80 mN/m.