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    Method of preparing diisocyanate composition
    2.
    发明授权
    Method of preparing diisocyanate composition 有权

    公开(公告)号：US11339121B2

    公开(公告)日：2022-05-24

    申请号：US17111949

    申请日：2020-12-04

    申请人： SKC CO., LTD. ,  WOORI FINE CHEM CO., LTD.

    发明人： Jaeyoung Pai ,  Jeongmoo Kim ,  Hyuk Hee Han ,  Jung Hwan Myung

    IPC分类号： C07C263/20 ,  C07C265/14

    摘要： In the embodiments, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by controlling the size of the diamine hydrochloride composition, the b* value according to the CIE color coordinate of the diamine hydrochloride composition, or the content of water in the diamine hydrochloride composition within a specific range.

    Process for preparing isocyanates
    3.
    发明授权
    Process for preparing isocyanates 有权

    公开(公告)号：US11225546B2

    公开(公告)日：2022-01-18

    申请号：US16491922

    申请日：2018-02-28

    申请人： Dow Global Technologies LLC

    发明人： Artur Klinger ,  Paul A. Gillis ,  Irfan Khan

    IPC分类号： C08G18/76 ,  B01F5/04 ,  C07C263/10 ,  C07C265/14

    摘要： A process for preparing an isocyanate product includes providing a phosgene inlet stream and an amine in solvent inlet stream to a phosgenation mixer, the amine in-solvent inlet stream including one or more amines and one or more inert solvents, and during steady state operation compensating for a fouling pressure drop increase by decreasing a pressure drop in the phosgenation mixer over a time period divided into at least a first period of time T1 and a second period of time T2 that is subsequent to the first period of time T1. During the second period of time T2 an amine concentration of the one or more amines in the amine-in-solvent stream is higher than during the first period of time T1, and during the second period of time T2 a phosgene-to-amine ratio value in the phosgenation mixer is higher than during the first period of time T1.

    Method for controlling the process for making isocyanates
    6.
    发明授权
    Method for controlling the process for making isocyanates 有权

    公开(公告)号：US10227294B2

    公开(公告)日：2019-03-12

    申请号：US15767870

    申请日：2016-09-28

    申请人： HUNTSMAN INTERNATIONAL LLC

    发明人： Peter Muller ,  Robert Henry Carr

    IPC分类号： C07C263/10 ,  C08G18/76 ,  B01J19/00 ,  C07C265/14

    摘要： The invention relates to a method for preparing an aromatic polyisocyanate in an isocyanate plant comprising a reaction section for a phosgenation reaction, wherein a primary aromatic amine is reacted with phosgene compounds in a reaction section to obtain an isocyanate comprising reaction product and wherein CO2 concentration in the gases coming from the reaction section is measured and analyzed, and wherein the conditions in the phosgenation reaction are adjusted in case the CO2 concentration in the gases coming from the reaction section is higher than a background CO2 concentration.

    XYLYLENE DIISOCYANATE COMPOSITION WITH IMPROVED STABILITY AND REACTIVITY AND OPTICAL LENS USING THE SAME
    7.
    发明申请
    XYLYLENE DIISOCYANATE COMPOSITION WITH IMPROVED STABILITY AND REACTIVITY AND OPTICAL LENS USING THE SAME 审中-公开

    公开(公告)号：US20180334428A1

    公开(公告)日：2018-11-22

    申请号：US15980821

    申请日：2018-05-16

    申请人： SKC CO., LTD.

    发明人： Junghwan SHIN ,  Hyuk Hee HAN ,  Seung Mo HONG ,  Sang Mook KIM

    IPC分类号： C07C263/18 ,  C07C265/14 ,  C08G18/38 ,  C08G18/76 ,  G02B1/04

    摘要： The xylylene diisocyanate composition according to the embodiments has a chlorine content of 100 to 1,000 ppm to improve the stability, so that the degradation of the reactivity can be prevented even when it is stored for a long period of time. Therefore, even if the xylylene diisocyanate composition according to the embodiments is used after it has been stored for a long period of time for sale or the like, the xylylene diisocyanate composition can be polymerized with a thiol to produce a polythiourethane-based optical material having excellent properties such as refractive index, Abbe number, transparency, glass transition temperature, yellowness index, and the like. Therefore, it can be advantageously used in the field of eyeglass lenses, camera lenses, and the like.