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    Method for extrusion of powered PVC compounds
    4.
    发明授权
    Method for extrusion of powered PVC compounds 失效
    用于挤出动力PVC化合物的方法

    公开(公告)号：US5198170A

    公开(公告)日：1993-03-30

    申请号：US930972

    申请日：1992-08-17

    申请人： Roman B. Hawrylko

    发明人： Roman B. Hawrylko

    IPC分类号： B29B9/06

    CPC分类号： B29B9/06

    摘要： This invention discloses an improved method for powder PVC extrusion using particulate PVC resin specified herein which enables smooth, dull surfaces for extrudates under broad processing conditions, in particular at relatively lower shear and temperature. The resins are characterized as having an average particle size ranging from 50 to 125 microns, a DOP porosity of from about 0.27 cc/gm to about 0.5 cc/gm, and a friability rating of 5 or less, preferably 2 or less depending on the stock temperature range during extrusion.

    摘要翻译： 本发明公开了一种用于本文所述的颗粒状PVC树脂的粉末PVC挤出的改进方法，其能够在宽的加工条件下，特别是在相对较低的剪切和温度下，使挤出物平滑无光泽的表面。 该树脂的特征在于平均粒度为50至125微米，DOP孔隙率为约0.27cc / g至约0.5cc / gm，脆性等级为5或更小，优选为2或更小，这取决于 挤出过程中的储存温度范围。

    Process for producing porous spherical polyvinyl chloride particles
    5.
    发明授权
    Process for producing porous spherical polyvinyl chloride particles 失效
    生产多孔球形聚氯乙烯颗粒的方法

    公开(公告)号：US4727091A

    公开(公告)日：1988-02-23

    申请号：US44266

    申请日：1987-04-30

    申请人： Roman B. Hawrylko

    发明人： Roman B. Hawrylko

    IPC分类号： C08F14/06 ,  C08J9/00

    CPC分类号： C08F14/06

    摘要： An improved process is provided for producing porous PVC resin particles by a thickened aqueous suspension polymerization process comprising polymerizing vinyl chloride monomer in an aqueous suspension wherein said aqueous medium contains at least one dispersant capable of thickening water, and optionally at least one secondary surfactant, at least one oil-soluble free radical generating catalyst, the improvement comprising charging said free radical catalyst as a solution wherein the solvent for said catalyst solution has a density equal to or less than that of the monomer being polymerized and the catalyst solution has a density less than water.

    摘要翻译： 提供了一种通过增稠的水性悬浮聚合方法制备多孔PVC树脂颗粒的改进方法，包括在水性悬浮液中聚合氯乙烯单体，其中所述水性介质包含至少一种能够增稠水的分散剂和任选的至少一种第二表面活性剂， 至少一种油溶性自由基产生催化剂，其改进包括将所述自由基催化剂作为溶液装入，其中所述催化剂溶液的溶剂的密度等于或小于被聚合的单体的密度，催化剂溶液的密度降低 比水。

    Method for providing improved colloidal stability and polyvinyl chloride using a hot charge polymerization procedure with emulsifier package
    6.
    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.

    Process for producing porous spherical polyvinyl chloride particles
    9.
    发明授权
    Process for producing porous spherical polyvinyl chloride particles 失效

    公开(公告)号：US4684668A

    公开(公告)日：1987-08-04

    申请号：US12761

    申请日：1987-02-06

    申请人： Roman B. Hawrylko

    发明人： Roman B. Hawrylko

    IPC分类号： C08F14/06 ,  C08J9/00

    CPC分类号： C08F14/06

    摘要： An improved process is provided for producing porous PVC resin particles by a thickened aqueous suspension polymerization process comprising polymerizing vinyl chloride monomer in an aqueous suspension wherein said aqueous medium contains at least one dispersant capable of thickening water, and optionally at least one secondary surfactant, at least one oil-soluble free radical generating catalyst, the improvement comprising charging said free radical catalyst as a solution wherein the solvent for said catalyst solution has a density equal to or less than that of the monomer being polymerized and the catalyst solution has a density less than water.