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    Method for preparing an aqueous polymer dispersion from a vinyl aromatic compound and a conjugated aliphatic diene
    1.
    发明授权
    Method for preparing an aqueous polymer dispersion from a vinyl aromatic compound and a conjugated aliphatic diene 有权

    公开(公告)号：US12098222B2

    公开(公告)日：2024-09-24

    申请号：US17299680

    申请日：2019-11-21

    申请人： BASF SE

    发明人： Nico Veling ,  Carmen-Elena Cimpeanu ,  Dirk Lawrenz

    IPC分类号： C08F2/22 ,  C08F2/38 ,  C08F212/08 ,  C08F220/06 ,  C08F222/02 ,  C08F236/06 ,  C08F236/08 ,  C08K5/14 ,  D21H19/58

    CPC分类号： C08F2/22 ,  C08F2/38 ,  C08F212/08 ,  C08F220/06 ,  C08F222/02 ,  C08F236/06 ,  C08F236/08 ,  C08K5/14 ,  D21H19/58 ,  C08F2800/20

    摘要： The present invention relates to a process for producing an aqueous polymer dispersion by free-radically initiated aqueous emulsion polymerization, by polymerizing, in an aqueous medium,



    (a) 40 to 75 parts by weight of at least one vinylaromatic compound and
    (b) 24.9 to 59.9 parts by weight of at least one conjugated aliphatic diene
    (c) 0.1 to 10 parts by weight of at least one monomer comprising acid groups and
    (d) 0 to 20 parts by weight of at least one other monoethylenically unsaturated monomer,
    the amounts of the monomers (a) to (d) adding up to 100 parts by weight,
    in a monomer feed process in the presence of at least one inorganic peroxide and at least one organic peroxide, with the proviso that
    the continuous metering of the inorganic peroxide starts at the same time as the continuous metering of the vinylaromatic compound,
    the metering of the organic peroxide is started at a time at which at least 5% and not more than 20% of the vinylaromatic compound has already been metered in in a continuous mass flow under polymerization conditions and
    optionally a portion of the inorganic peroxide is initially charged,
    and also to the aqueous polymer dispersions produced by the process and to the use of these as a binder, adhesive, sizing agent for fibers, for the production of coatings or for the production of a paper coating slip.

    METHOD FOR PREPARING ACRYLATE LAMINATING ADHESIVE BY SOAP-FREE EMULSION POLYMERIZATION
    6.
    发明公开
    METHOD FOR PREPARING ACRYLATE LAMINATING ADHESIVE BY SOAP-FREE EMULSION POLYMERIZATION 审中-公开

    公开(公告)号：US20240052215A1

    公开(公告)日：2024-02-15

    申请号：US17762661

    申请日：2021-09-14

    申请人： JIANGSU JINGHONG NEW MATERIALS TECHNOLOGY CO., LTD.

    发明人： Dawei SUN ,  Zhijian DU ,  Zhuang DING ,  Quanwei GAO

    IPC分类号： C09J151/00 ,  C08F2/38 ,  C08F287/00 ,  C08F2/22

    CPC分类号： C09J151/006 ,  C08F2/38 ,  C08F287/00 ,  C08F2/22 ,  C08F2438/03

    摘要： A method for preparing an acrylate laminating adhesive by soap-free emulsion polymerization, and an acrylate laminating adhesive prepared by soap-free emulsion polymerization. In the method, an acrylate block oligomer with emulsifiability is synthesized by using a RAFT active radical polymerization process, and an acrylate monomer is emulsified by using the acrylate block oligomer for a semi-continuous emulsion polymerization, which overcomes a defect that traditional small molecule emulsifiers tend to migrate to a surface of an adhesive film to form a weak interface layer, resulting in a decreased bonding strength, a poor water resistance and the like. Further, in the disclosure, the use of n-pentanol as a chain transfer agent could not only reduce the molecular weight of polymer, improving fluidity and laminating uniformity of the adhesive, but also reduce the surface tension of the emulsion, improving coating wettability and levelling properties of the acrylate laminating adhesive.

    Polyacrylonitrile (PAN) and preparation method and use thereof
    7.
    发明授权
    Polyacrylonitrile (PAN) and preparation method and use thereof 有权

    公开(公告)号：US11897979B2

    公开(公告)日：2024-02-13

    申请号：US17811301

    申请日：2022-07-07

    申请人： Changchun University of Technology

    发明人： Zhongyu Fu ,  Huijie Yan ,  Huixuan Zhang

    IPC分类号： C08F20/44 ,  C08F220/44 ,  C08F2/38 ,  C08F2/44

    CPC分类号： C08F20/44 ,  C08F2/44

    摘要： Some embodiments of the disclosure provides polyacrylonitrile (PAN) and a preparation method and use thereof. The method includes the following steps. Mixing raw materials for polymerization to obtain a suspension comprising the PAN. The raw materials include an acrylonitrile monomer, a first auxiliary monomer, a second auxiliary monomer, a polymerization medium, an initiator, a chain transfer agent, and a settling agent. Removing unreacted monomers and unreacted polymerization medium in the suspension to obtain the PAN. After subsequent removal of monomers, removal of a polymerization medium, washing, and drying, a PAN powder is obtained. In some embodiments, the preparation method of the PAN has a wide adjustable range of a PAN copolymerization composition, a low viscosity of a polymerization system, a high concentration of a polymerized monomer, and a strong anti-scaling ability.