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    METHOD OF PREPARING VINYL CHLORIDE-BASED POLYMER
    1.
    发明申请
    METHOD OF PREPARING VINYL CHLORIDE-BASED POLYMER 有权

    公开(公告)号：US20250002613A1

    公开(公告)日：2025-01-02

    申请号：US18708805

    申请日：2023-05-12

    Applicant: LG CHEM, LTD.

    Inventor： Heung Kwon BAE ,  Se Woong LEE ,  Eun Byeol SEO ,  Hyun Kyou HA ,  Kun Ji KIM

    IPC: C08F2/01 ,  C08F2/20 ,  C08F6/00 ,  C08F214/06

    Abstract: The present invention relates to a method of preparing a vinyl chloride-based polymer in a polymerization device including: a polymerization reactor; a reflux condenser connected to the polymerization reactor; and a recovery pipe connected to the reflux condenser, the method including: initiating a polymerization by adding a first vinyl chloride-based monomer and an initiator into the polymerization reactor; and recovering a second vinyl chloride-based monomer from the polymerization reactor through the recovery pipe, and performing a polymerization while adding a third vinyl chloride-based monomer into the polymerization reactor, wherein a content of the initiator is 0.105 to 0.110 parts by weight based on 100 parts by weight of a content of the first vinyl chloride-based monomer.

    VINYL CHLORIDE POLYMER AND PREPARATION METHOD THEREOF
    2.
    发明申请
    VINYL CHLORIDE POLYMER AND PREPARATION METHOD THEREOF 审中-公开
    乙烯基氯化聚合物及其制备方法

    公开(公告)号：US20160304636A1

    公开(公告)日：2016-10-20

    申请号：US15101803

    申请日：2015-09-14

    Applicant: LG CHEM, LTD.

    Inventor： Kyung Seog YOUK ,  Hyun Min LEE ,  Chan Hee LEE ,  Heung Kwon BAE ,  Kwang Jin LEE ,  Kyung Hyun KIM ,  Jung Rae LEE

    IPC: C08F14/06

    CPC classification number: C08F114/06 ,  C08F8/32 ,  C08F8/40 ,  C08F14/06

    Abstract: The present invention relates to a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a method of preparing the same. The generation of the dehydrochlorination of the vinyl chloride polymer due to heat or ultraviolet rays may be markedly restrained, the thermal stability thereof may be improved, and the discoloration thereof or the modification of the physical properties thereof may be prevented. In addition, a modifier may be introduced to a polymerization process at the end of the polymerization, and high thermal stability may be attained without generating the transformation of the vinyl chloride polymer.

    Abstract translation: 本发明涉及由于热或紫外线的脱氯化氢的限制而具有良好热稳定性的氯乙烯聚合物及其制备方法。 可以显着抑制由于热或紫外线而产生的氯乙烯聚合物的脱氯化氢，其热稳定性可以提高，并且可以防止其变色或其物理性质的改变。 此外，可以在聚合结束时将改性剂引入聚合方法，并且可以在不产生氯乙烯聚合物的转化的情况下获得高热稳定性。

    METHOD OF PREPARING VINYL CHLORIDE POLYMER
    5.
    发明申请
    METHOD OF PREPARING VINYL CHLORIDE POLYMER 有权

    公开(公告)号：US20250145743A1

    公开(公告)日：2025-05-08

    申请号：US18832863

    申请日：2023-05-31

    Applicant: LG CHEM, LTD.

    Inventor： Se Woong LEE ,  Hyun Kyou HA ,  Kun Ji KIM ,  Heung Kwon BAE ,  Hyun Chul KIM ,  Yun Seok CHOI

    IPC: C08F14/06 ,  C08F6/28

    Abstract: A method of preparing a vinyl chloride polymer is provided. The method includes: preparing a mixture by adding an alcohol to a vinyl chloride polymer slurry (S1); separating a waste liquid from the mixture to obtain a vinyl chloride polymer (S2); and adding at least a portion of the separated waste liquid to the mixture (S3); wherein a content of the at least a portion of the separated waste liquid added in Step S3 is in the range of 33.0 to 35.0 parts by weight with respect to 100 parts by weight of the mixture.

    METHOD FOR PREPARING POLYMERIZATION INITIATOR COMPOSITION
    7.
    发明申请
    METHOD FOR PREPARING POLYMERIZATION INITIATOR COMPOSITION 有权

    公开(公告)号：US20210198388A1

    公开(公告)日：2021-07-01

    申请号：US17056973

    申请日：2019-10-07

    Applicant: LG CHEM, LTD.

    Inventor： Heung Kwon BAE ,  Kyung Seog YOUK ,  Jung Rae LEE ,  Hyun Min LEE ,  Joong Chul LIM ,  Min Jeong KANG

    IPC: C08F2/38 ,  C08F14/06 ,  C08F2/22

    Abstract: The present disclosure provides a method for preparing a polymerization initiator composition, including (a) a step of mixing water and a water-soluble initiator to prepare an aqueous initiator solution having a concentration of 1 to 10%; and (b) a step of activating the aqueous initiator solution, wherein the step of activating is performed by (b-1) a step of heat treating the aqueous initiator solution for 0.5 to 4.5 hours at a temperature of 48 to 62° C.; and (b-2) a step of treating the aqueous initiator solution to achieve pH of 1 to 7, where the steps above are performed in no particular order.

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