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    Method for providing improved colloidal stability and polyvinyl chloride using a hot charge polymerization procedure with emulsifier package
    1.
    发明授权
    Method for providing improved colloidal stability and polyvinyl chloride using a hot charge polymerization procedure with emulsifier package 失效
    使用具有乳化剂包装的热电荷聚合方法提供改进的胶体稳定性和聚氯乙烯的方法

    公开(公告)号：US4957983A

    公开(公告)日：1990-09-18

    申请号：US362627

    申请日：1989-06-07

    申请人： Roman B. Hawrylko ,  Richard A. Widdifield

    发明人： Roman B. Hawrylko ,  Richard A. Widdifield

    IPC分类号： C08F2/20 ,  C08F2/22 ,  C08F2/24 ,  C08F14/00 ,  C08F14/06

    CPC分类号： C08F14/06 ,  Y02P20/52

    摘要： A method for polymerizing polyvinyl chloride and polyvinyl chloride copolymers is provided in which a monomer slurry is formed by adding the monomers and water (hot or cold) in the reaction vessel, and the slurry is brought to reaction temperature. After a time delay of 0 to 15 minutes, an emulsifier package is added, and after a further time delay of 0 to 15 minutes, a catalyst emulsion is added. The emulsifier package comprises a primary emulsifier which is partially saponified polyvinyl alcohol having a degree of saponification between about 60 and about 90 mole percent and a solubility in methanol index at 55.degree. C. in a range of up to about 60 percent. A secondary emulsifier is included in the emulsifier package which is a preferably cellulosic type emulsifier. Preferably an additional emulsifier is added which is a hydrolyzed polyvinyl acetate having a degree of hydrolysis of at least 68 percent. The polymerization product has good bulk density and porosity parameters. Resins produced from this product have low fisheye characteristics.