公开(公告)号：US5767231A

公开(公告)日：1998-06-16

申请号：US504853

申请日：1995-07-20

申请人： Volker Schull ,  Detlef Arnoldi

发明人： Volker Schull ,  Detlef Arnoldi

IPC分类号： C08F6/14 ,  C08F6/00 ,  C08F6/06 ,  C08L27/06 ,  C08L33/12 ,  C08F6/16

CPC分类号： C08F6/001 ,  C08F6/006 ,  C08L27/06 ,  C08L33/12

摘要： A method for lowering the residual monomer content of non-vitrified processing aids for thermoplastic polymers involves subjecting an emulsion polymerizate containing methylmethacrylate and, optionally, up to 50% by weight of a comonomer to a post-catalysis step to reduce the residual monomer content followed by a spray-drying step where the residual monomer content is further reduced. The spray-drying step is performed at an exit temperature which is either above the boiling point of methylmethacrylate or if an optional comonomer is present which has a higher boiling point than methacrylate, at a temperature above the boiling point of the comonomer. The resulting product which is suitable for use as a non-vitrified processing aid has a residual monomer content of 100 ppm or less. The processing aid can be used with thermoplastics to form containers, e.g., beverage bottles of PVC, which would not adversely affect odor or taste of the contained food product.

摘要翻译： 降低热塑性聚合物的非玻璃化加工助剂的残留单体含量的方法包括将含有甲基丙烯酸甲酯和任选的至多50重量％的共聚单体的乳液聚合物经历催化后步骤以减少残余单体含量，随后 通过喷雾干燥步骤进一步降低剩余单体含量。 喷雾干燥步骤在高于甲基丙烯酸甲酯的沸点的出口温度下进行，或者在高于共聚单体沸点的温度下，如果存在沸点高于甲基丙烯酸酯的任选共聚单体。 得到的适用于非玻璃化加工助剂的产品的残留单体含量为100ppm以下。 加工助剂可以与热塑性塑料一起使用以形成容器，例如PVC的饮料瓶，其不会不利地影响所含食品的气味或味道。