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    Method of preparing copolymer
    1.
    发明授权
    Method of preparing copolymer 有权

    公开(公告)号：US11407847B2

    公开(公告)日：2022-08-09

    申请号：US16469546

    申请日：2018-12-19

    申请人： LG CHEM, LTD.

    发明人： In Soo Kim ,  Min Cheol Ju ,  Min Seung Shin ,  Sung Won Hong ,  Hyung Sub Lee

    IPC分类号： C08F212/10 ,  C08F2/00 ,  C08F2/18

    摘要： Provided is a method of preparing a copolymer which includes 1) initiating polymerization by batch-adding an aromatic vinyl-based monomer and a vinyl cyan-based monomer to a reactor; and 2) performing polymerization by continuously adding an aromatic vinyl-based monomer to the reactor at a predetermined rate after the initiation of polymerization, wherein the continuous addition of the aromatic vinyl-based monomer is initiated when a polymerization conversion rate is 10% or less and terminated when a polymerization conversion rate is between 80 and 90%, and step 2) includes a first temperature phase and a second temperature phase, each of which maintains a constant temperature, wherein a temperature of the second temperature phase is higher than that of the first temperature phase, and thereby a copolymer with a small standard deviation for a vinyl cyan-based unit composition and excellent transparency may be prepared.

    Method of preparing thermoplastic resin, thermoplastic resin prepared therfrom and thermoplastic resin composition comprising the same
    2.
    发明授权
    Method of preparing thermoplastic resin, thermoplastic resin prepared therfrom and thermoplastic resin composition comprising the same 有权

    公开(公告)号：US11339237B2

    公开(公告)日：2022-05-24

    申请号：US16627715

    申请日：2019-07-09

    申请人： LG CHEM, LTD.

    发明人： Minseung Shin ,  Mincheol Ju ,  Sungwon Hong ,  Insoo Kim ,  Hyung Sub Lee

    IPC分类号： C08F236/04 ,  C08F2/22 ,  C08F212/10 ,  C08F6/14

    摘要： The present invention relates to a method of preparing a thermoplastic resin, a thermoplastic resin prepared by the same, and a thermoplastic resin composition including the same. More specifically, the method of the present invention includes a step of performing acid coagulation of emulsion polymerization latex, a step of treating coagulated slurry with a base and performing dehydration, and a step of adding a metal salt and water to dehydrated wet powder to adjust pH to 9 or more. According to the present invention, the method may increase the productivity of a thermoplastic resin, and the thermoplastic resin prepared by the method has excellent mechanical strength, thermal stability, and appearance properties. In addition, when the thermoplastic resin of the present invention is used in coating, the thermoplastic resin has an effect of improving the adhesive strength and appearance quality of a coating film.

    Method of preparing thermoplastic resin
    5.
    发明授权
    Method of preparing thermoplastic resin 有权

    公开(公告)号：US10392457B2

    公开(公告)日：2019-08-27

    申请号：US15528492

    申请日：2016-09-08

    申请人： LG CHEM, LTD.

    发明人： Sung Won Hong ,  Hyung Sub Lee ,  Min Cheol Ju ,  Min Seung Shin ,  In Soo Kim

    IPC分类号： C08F212/12 ,  C08L9/08 ,  C08F6/22 ,  C08K3/34 ,  C08L25/16 ,  C08K3/10 ,  C08J3/07 ,  C08K3/16 ,  C08K3/30

    摘要： The present invention relates to a method of preparing a thermoplastic resin. More particularly, the present invention relates to a method of preparing a thermoplastic resin, the method including a coagulation step of adding a water-soluble silicate compound and a metal salt coagulant to an α-methylstyrene-vinyl cyan compound copolymer latex, followed by coagulation. In accordance with the present invention, a method of preparing a thermoplastic resin having superior heat resistance by adding an additive during coagulation and aging of α-methylstyrene-vinyl cyan compound copolymer latex while controlling an addition time point of the additive is provided.