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    Suspension polymerization of vinyl chloride with heating of reactor surfaces
    1.
    发明授权
    Suspension polymerization of vinyl chloride with heating of reactor surfaces 失效
    乙烯基氯化锂与反应器表面加热的悬浮聚合

    公开(公告)号：US5210158A

    公开(公告)日：1993-05-11

    申请号：US741652

    申请日：1991-08-07

    申请人： Tadashi Amano ,  Shigehiro Hoshida ,  Yoshihiro Shirota

    发明人： Tadashi Amano ,  Shigehiro Hoshida ,  Yoshihiro Shirota

    IPC分类号： C08F2/00 ,  C08F2/18 ,  C08F2/20 ,  C08F14/00 ,  C08F14/06

    CPC分类号： C08F2/002 ,  C08F14/06

    摘要： An improvement is proposed in the process of suspension polymerizatiopn of vinyl chloride monomer in an aqueous polymerization medium, by which a resin product of high quality relative to the contents of foamy resin and fish-eyes can be produced in a high efficiency with little deposition of polymer scale on the reactor walls. The improvment comprises heating and keeping the surfaces of the polymerization reactor and accessory equipment coming into contact with the gaseous phase above the polymerization mixture at a temperature of 55.degree. C. or higher during a period starting from a moment when the temperature of the polymerization mixture under temperature elevation up to the polymerization temperature is still 45.degree. C. or lower to a moment when conversion of the monomer into polymer is at least 10% so that foaming on the polymerization mixture can be greatly reduced.

    Process for preparing vinyl chloride polymer improved in plasticizer take-up by two-stage addition of dispersion stabilizers
    6.
    发明授权
    Process for preparing vinyl chloride polymer improved in plasticizer take-up by two-stage addition of dispersion stabilizers 失效
    制备氯乙烯聚合物的方法通过两步加入分散稳定剂改善了增塑剂的吸收

    公开(公告)号：US5204421A

    公开(公告)日：1993-04-20

    申请号：US560825

    申请日：1990-07-31

    申请人： Tadashi Amano ,  Shigehiro Hoshida

    发明人： Tadashi Amano ,  Shigehiro Hoshida

    IPC分类号： C08F2/18 ,  C08F2/20 ,  C08F14/00 ,  C08F14/06

    CPC分类号： C08F14/06

    摘要： A process for preparing a vinyl chloride polymer of the present invention comprises initiating suspension polymerization by suspending a vinyl chloride monomer in an aqueous medium in the presence of a first dispersion stabilizer and adding a second dispersion stabilizer at a specified time after the initiation of polymerization. Here, as the first dispersion stabilizer, (A) a partially saponified polyvinyl alcohol with a high saponification degree and (B) a hydroxypropylmethyl cellulose are used in combination, and as the second dispersion stabilizer, (C) a partially polyvinyl alcohol with a low saponification degree is used. According to the process, it is possible to prepare a vinyl chloride polymer with excellent characteristics such as plasticizer take-up, etc.

    摘要翻译： 制备本发明的氯乙烯聚合物的方法包括在第一分散体稳定剂存在下将氯乙烯单体悬浮在含水介质中并在聚合开始后的特定时间加入第二分散体稳定剂引发悬浮聚合。 这里，作为第一分散稳定剂，组合使用（A）皂化度高的部分皂化聚乙烯醇和（B）羟丙基甲基纤维素，作为第二分散稳定剂，（C）低分子量的部分聚乙烯醇 使用皂化度。 根据该方法，可以制备具有优异特性的增塑剂卷取等的氯乙烯聚合物

    Process for terminating the polymerization of vinyl chloride with an aqueous dispersion of an antioxidant containing a polyoxyalkylene oxide
    7.
    发明授权
    Process for terminating the polymerization of vinyl chloride with an aqueous dispersion of an antioxidant containing a polyoxyalkylene oxide 失效
    用含有聚氧化烯的抗氧化剂的水性分散体终止氯乙烯聚合的方法

    公开(公告)号：US5159032A

    公开(公告)日：1992-10-27

    申请号：US562926

    申请日：1990-08-06

    申请人： Tadashi Amano ,  Shigehiro Hoshida

    发明人： Tadashi Amano ,  Shigehiro Hoshida

    IPC分类号： C08F2/00 ,  C08F2/38 ,  C08F14/00 ,  C08F14/06 ,  C08L27/06 ,  C08L53/00

    CPC分类号： C08L27/06 ,  C08F14/06 ,  C08L53/00

    摘要： A process for preparing a vinyl chloride polymer, which comprises polymerizing vinyl chloride or a monomeric mixture composed mainly of vinyl chloride in an aqueous medium, wherein the polymerization reaction is terminated at the last stage of polymerization by addition of an aqueous dispersion of an antioxidant, containing a polyoxyalkylene glycol as a dispersing agent. A polymer with good initial coloration characteristic, thermal stability and take-up of plasticizer, and large bulk density can be obtained.

    摘要翻译： 一种制备氯乙烯聚合物的方法，其包括在水性介质中聚合氯乙烯或主要由氯乙烯组成的单体混合物，其中聚合反应在聚合的最后阶段通过加入抗氧化剂的水分散体而终止， 含有聚氧亚烷基二醇作为分散剂。 可以获得具有良好初始着色特性，热稳定性和增塑剂吸收性以及大体积密度的聚合物。

    Process for producing vinyl chloride polymer
    8.
    发明授权
    Process for producing vinyl chloride polymer 失效
    制备氯乙烯聚合物的方法

    公开(公告)号：US5130387A

    公开(公告)日：1992-07-14

    申请号：US780579

    申请日：1991-10-22

    申请人： Tadashi Amano ,  Shigehiro Hoshida

    发明人： Tadashi Amano ,  Shigehiro Hoshida

    IPC分类号： C08F2/18 ,  C08F2/20 ,  C08F14/00 ,  C08F14/06 ,  C08F214/06

    CPC分类号： C08F214/06 ,  C08F14/06

    摘要： A process for producing a vinyl chloride polymer for matted moldings which comprises performing the suspension polymerization of vinyl chloride monomer or a mixture of vinyl monomers composed mainly of vinyl chloride in an aqueous medium, said suspension polymerization being performed after the addition of an aqueous dispersion obtained by dispersing a polyfunctional monomer having 2 or more ethylenic double bonds in the molecule into an aqueous solution of a water-soluble partially saponified polyvinyl alcohol, a water-soluble cellulose eter or an emulsifier, thereby yielding a vinyl chloride resin composed of 5 to 90 wt % tetrahydrofuran-insoluble gel fraction, with the remainder being tetrahydrofuran-solubles.

    摘要翻译： 一种生产用于消光模塑制品的氯乙烯聚合物的方法，其包括在水性介质中进行氯乙烯单体或主要由氯乙烯组成的乙烯基单体的混合物的悬浮聚合，所述悬浮聚合是在加入获得的水分散体之后进行的 通过将分子中具有2个以上烯属双键的多官能单体分散在水溶性部分皂化聚乙烯醇，水溶性纤维素或乳化剂的水溶液中，得到5〜90重量份的氯乙烯树脂 wt％四氢呋喃不溶性凝胶馏分，其余为四氢呋喃可溶物。

    Method for preparing vinyl chloride polymers
    9.
    发明授权
    Method for preparing vinyl chloride polymers 失效
    氯乙烯聚合物的制备方法

    公开(公告)号：US4954595A

    公开(公告)日：1990-09-04

    申请号：US240734

    申请日：1988-09-06

    申请人： Tadashi Amano ,  Shigehiro Hoshida

    发明人： Tadashi Amano ,  Shigehiro Hoshida

    IPC分类号： C08F2/20 ,  C08F14/06

    CPC分类号： C08F14/06

    摘要： A method for preparing vinyl chloride polymers which comprises polymerizing vinyl chloride monomer or a vinylic monomer mixture mainly composed of vinyl chloride in an aqueous medium in the presence of a polymerization initiator, characterized by washing a piping and an opening of a polymerizer, for charging the polymerization initiator into the polymerizer, with water, steam or a washing liquid capable of lowering the half-life of the polymerization initiator to not more than 30 minutes after introducing the initiator into the polymerizer. The method makes it possible to eliminate the formation of polymer scales on the piping and the opening for charging the polymerization initiator into a polymerizer and, therefore, the yield of the vinyl chloride polymers can greatly improved and the production cost can be substantially saved. Moreover, the polymer product does not include any materials used for washing said portions and thus polymer product of high quality can be provided in a high yield.

    摘要翻译： 一种制备氯乙烯聚合物的方法，其包括在聚合引发剂存在下，在水性介质中聚合氯乙烯单体或主要由氯乙烯组成的乙烯基单体混合物，其特征在于，清洗管道和聚合反应器的开口， 将聚合引发剂引入聚合反应器中，与引入剂引入聚合反应器中的水，蒸汽或能够将聚合引发剂的半衰期降至不超过30分钟的洗涤液。 该方法可以消除管道上的聚合物垢的形成和将聚合引发剂加入聚合反应器的开口，从而可大大提高氯乙烯聚合物的收率，并且可以显着节省生产成本。 此外，聚合物产品不包括用于洗涤所述部分的任何材料，因此可以高产率提供高质量的聚合物产品。