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    • 2. 发明授权
    • Ethylene-.alpha.-olefin-diolefin elastomers solution polymerization
process
    • 乙烯-α-烯烃 - 二烯烃弹性体溶液聚合过程
    • US5696213A
    • 1997-12-09
    • US426363
    • 1995-04-21
    • Rinaldo Soria SchiffinoJavier Mario Zamora
    • Rinaldo Soria SchiffinoJavier Mario Zamora
    • C08F2/00C08F2/06C08F4/64C08F4/643C08F210/00C08F210/06C08F210/16C08F210/18
    • C08F210/16C08F210/18C08F210/06Y10S526/904
    • This invention is a solution process for the preparation of ethylene-.alpha.-olefin/diolefin copolymers comprising contacting ethylene, one or more .alpha.-olefin monomer, and optionally one or more diene monomer, with a catalyst system containing a catalyst activator and a Group 4 metallocene compound, comprising a) conducting the polymerization reaction at a temperature of about 60.degree. to 150.degree. C.; b) selecting as the Group 4 metallocene compound one or more members of the group consisting of cyclic monocyclopentadienyl Group 4 metal and covalently bridged (bis)indenyl hafnium metallocene compounds; and c) maintaining the .alpha.-olefin concentration at a molar ratio to that of ethylene of between about 0.3 to 7.0 and a diolefin to ethylene molar ratio of between about 0.01 and 0.4. In a preferred embodiment the process comprises: 1) mixing with a reaction solvent the one or more .alpha.-olefin monomer, the optional one or more diene monomer, and the catalyst activator, either together or separately, therafter 2) mixing with the reaction solvent an effective scavenging compound prior to or with introduction of the unactivated Group 4 metallocene compound under conditions such that the scavenging compound is in contact with the activator compound for a period of time not exceeding about 1 minute, and 3) contacting the activator compound with the unactivated Group 4 metallocene compound in the presence of said monomers. The process can be advantageously practiced a reaction temperature of at least 60.degree. C., preferably above 80.degree. C., most preferably above 110.degree. C., to achieve high number average molecular weight polymer having high .alpha.-olefin monomer and diene monomer contents with high diene conversion rates. The process is particularly suitable for the preparation of elastomeric ethylene-propylene or ethylene-propylene-diene monomer elastomers.
    • 本发明是用于制备乙烯-α-烯烃/二烯烃共聚物的溶液方法,包括使乙烯,一种或多种α-烯烃单体和任选的一种或多种二烯单体与含有催化剂活化剂和第4族 茂金属化合物,包括a)在约60℃至150℃的温度下进行聚合反应; b)选择第4族茂金属化合物由环状单环戊二烯基4金属和共价桥连(双)茚基铪茂金属化合物组成的一个或多个成员; 和c)将α-烯烃浓度保持在约0.3-7.0之间的乙烯摩尔比和二烯烃与乙烯的摩尔比在约0.01和0.4之间。 在优选的实施方案中,该方法包括:1)将反应溶剂与一种或多种α-烯烃单体,任选的一种或多种二烯单体和催化剂活化剂在一起或分开混合,然后将其与反应溶剂 在未活化的第4族茂金属化合物引入之前或之后,使清除化合物与活化剂化合物接触一段时间不超过约1分钟的条件下的有效清除化合物,和3)使活化剂化合物与 在所述单体存在下未活化的第4族金属茂化合物。 该方法可以有利地实施至少60℃,优选高于80℃,最优选高于110℃的反应温度,以获得具有高α-烯烃单体和二烯单体含量的高数均分子量聚合物 二烯转化率高。 该方法特别适用于制备弹性体乙烯 - 丙烯或乙烯 - 丙烯 - 二烯单体弹性体。