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    • 5. 发明授权
    • Process for making polyvinyl chloride processing aid involving cooling step in acrylate graft polymerization of polyvinyl chloride
    • 涉及聚氯乙烯丙烯酸酯接枝聚合中的冷却步骤的聚氯乙烯加工助剂的方法
    • US3919137A
    • 1975-11-11
    • US36215973
    • 1973-05-21
    • STAUFFER CHEMICAL CO
    • DYER JAMES NYU ARTHUR J
    • C08F214/00C08F2/00C08F2/18C08F2/20C08F2/38C08F2/44C08F14/00C08F214/06C08F259/00C08F259/04C08L1/00C08L23/00C08L27/00C08L51/00C08L51/02C08L101/00C08F114/02C08F114/16
    • C08F259/04C08F220/14
    • A process is disclosed for preparing a polyacrylate-modified polyvinyl chloride processing aid for polyvinyl chloride by sequentially polymerizing the vinyl chloride and the desired acrylate ester monomer. Thus, a conventional vinyl chloride suspension polymerization is conducted at a controlled rate of agitation and in the presence of a specified concentration of an alkyl, hydroxyalkyl or carboxyalkyl modified cellulose suspending agent and is then halted at or near its completion; unreacted vinyl chloride monomer is removed, the suspension of polyvinyl chloride particles is cooled, a minor proportion of an acrylate ester monomer, e.g., methyl methacrylate, is then added with a fresh supply of a free radical initiating catalyst to the cooled suspension, the cooling being sufficient to retard polymerization of the acrylate, and polymerization is then resumed by heating the suspension and continued until the acrylate ester monomer polymerizes in and/or on the particles of the previously polymerized polyvinyl chloride. The polyacrylate-modified PVC thereby recovered is an effective aid for processing conventional PVC, or it can be processed per se since it is suitable for calendering or extruding.
    • 公开了通过顺序聚合氯乙烯和所需的丙烯酸酯单体制备用于聚氯乙烯的聚丙烯酸酯改性的聚氯乙烯加工助剂的方法。 因此,常规的氯乙烯悬浮液聚合以受控的搅拌速率和在特定浓度的烷基,羟烷基或羧烷基改性的纤维素悬浮剂的存在下进行,然后在其完成或接近完成时停止; 去除未反应的氯乙烯单体,将聚氯乙烯颗粒的悬浮液冷却,然后加入少量的丙烯酸酯单体,例如甲基丙烯酸甲酯,向冷却的悬浮液中加入新鲜的自由基引发催化剂,冷却 足以阻止丙烯酸酯的聚合,然后通过加热悬浮液并继续进行聚合,直到丙烯酸酯单体在先前聚合的聚氯乙烯的颗粒中和/或上聚合。 由此回收的聚丙烯酸酯改性PVC是用于加工常规PVC的有效助剂,或者它可以被加工本身,因为它适用于压延或挤出。