公开(公告)号：US5576401A

公开(公告)日：1996-11-19

申请号：US545375

申请日：1995-10-19

申请人： Roland Steiger ,  Erhard Asch ,  Wolfgang Baade ,  Werner Obrecht

发明人： Roland Steiger ,  Erhard Asch ,  Wolfgang Baade ,  Werner Obrecht

IPC分类号： C08F2/04 ,  C08F2/06 ,  C08F4/04 ,  C08F10/00 ,  C08F210/02 ,  C08F218/02 ,  C08F218/08 ,  C08J3/24

CPC分类号： C08F218/08 ,  C08F210/02

摘要： Gel-free ethylene/vinyl acetate copolymers with a high content of copolymerized vinyl acetate and a high Mooney viscosity are produced by carrying out the polymerization in solution in the presence of 20 to 45% by weight tert.butanol, based on the reaction solution, at temperatures of 50.degree. to 80.degree. C. and under pressures of 300 to 450 bar using azo compounds in a cascade of stirred reactors with an average residence time of the reaction solution in the reactor cascade of 5 to 9 hours and a conversion of 50 to 70% by weight, based on the vinyl acetate used. The ethylene/vinyl acetate copolymers produced by the process according to the invention may be used for the production of vulcanizates having improved mechanical properties.

摘要翻译： 基于反应溶液，在20-45％（重量）叔丁醇的存在下，通过在溶液中进行聚合来制备具有高含量共聚乙酸乙烯酯和高门尼粘度的无凝胶乙烯/乙酸乙烯酯共聚物， 在50至80℃的温度和300至450巴的压力下，在反应器级联反应器的平均停留时间为5至9小时的搅拌反应器级联中使用偶氮化合物，转化率为50 至70重量％，基于所用的乙酸乙烯酯。 通过本发明方法生产的乙烯/乙酸乙烯酯共聚物可用于生产具有改善的机械性能的硫化橡胶。

公开(公告)号：US06174991B1

公开(公告)日：2001-01-16

申请号：US09331927

申请日：1999-06-29

申请人： Roland Steiger

发明人： Roland Steiger

IPC分类号： C08C204

CPC分类号： C08C2/06

摘要： A process for the recovery of an initially living polymer from a cement produced in a polymerization process. The living polymer cement is shortstopped, washed, stabilised, coagulated and dried. The recovery process comprises adding a short stop to the polymer in the cement, washing catalyst residue from the polymer with water, adding an antioxidant Irganox 1520 to the cement to stabilise the polymer, adding epoxidised soya bean oil to the polymer to stabilise the polymer against colour degradation, and coagulating and drying the polymer. The pH of the cement is regulated in the range of from about 3 to about 7, and preferably from about 6 to about 7, during the catalyst wash and the coagulation steps of the recovery process. A product of the process is also described. The product and process provide for use of a preferred anti-oxidant system, which overcomes health concerns associated with existing anti-oxidant systems used in anionic polymerization processes, while providing a polymer product that has excellent colour and stability characteristics suitable for use in high impact polystyrene applications.

摘要翻译： 一种从聚合过程中生产的水泥中回收初始活性聚合物的方法。 活性聚合物水泥快速挤压，洗涤，稳定，凝结和干燥。 回收方法包括向水泥中的聚合物添加短停留点，用水洗涤聚合物中的催化剂残余物，向水泥中加入抗氧化剂Irganox 1520以稳定聚合物，向聚合物中加入环氧化大豆油以使聚合物反应 颜色退化，凝结和干燥聚合物。 在催化剂洗涤和回收过程的凝固步骤期间，水泥的pH调节在约3至约7，优选约6至约7的范围内。 还描述了该方法的产物。 该产品和方法提供使用优选的抗氧化系统，其克服了与阴离子聚合方法中使用的现有抗氧化系统相关的健康问题，同时提供具有优异的颜色和稳定性特征的聚合物产品，其适用于高冲击 聚苯乙烯应用。