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    • 4. 发明授权
    • Process for the production of vinylaromatic polymers with a high degree
of syndiotacticity
    • 用于制备具有高度间同立构规整度的乙烯基芳族聚合物的方法
    • US5830959A
    • 1998-11-03
    • US944783
    • 1997-10-06
    • Riccardo Po' Nicoletta CardiRoberto Santi
    • Riccardo Po' Nicoletta CardiRoberto Santi
    • C08F4/646C08F12/08C08F12/02
    • C08F12/08C08F4/65912
    • Process for the preparation of crystalline vinylaromatic polymers with a high degree of syndiotacticity which comprises polymerizing vinylaromatic monomers in the presence of a catalytic system essentially consisting of: a) a complex of titanium selected from those having the general formula: (CpR.sub.1 R.sub.2 R.sub.3 R.sub.4 R.sub.5)TiX.sub.3 (I) wherein the groups R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent a hydrogen atom or C.sub.1 -C.sub.10 alkyl groups; X represents a hydrogen atom, a halogen such as chlorine, a C.sub.1 -C.sub.10 alkyl or oxyalkyl radical or a C.sub.6 -C.sub.12 oxyaryl radical; b) an alkylaluminoxane; and c) an organic derivative of tin; characterized in that the alkylaluminoxane is methylaluminoxane (MAO) treated at 20.degree.-80.degree. C. under vacuum for 1-100 hours and the organic derivative of tin is tin tetraphenyl.
    • 用于制备具有高程度间同立构规整度的结晶乙烯基芳族聚合物的方法,其包括在催化体系存在下聚合乙烯基芳族单体,所述催化体系基本上由以下组成:a)选自具有以下通式的那些钛络合物:(CpR1R2R3R4R5)TiX3(I )其中基团R 1,R 2,R 3,R 4和R 5表示氢原子或C 1 -C 10烷基; X表示氢原子,卤素如氯,C1-C10烷基或烷氧基或C6-C12氧芳基; b)烷基铝氧烷; 和c)锡的有机衍生物; 其特征在于烷基铝氧烷是在20-80℃下真空处理1-100小时的甲基铝氧烷(MAO),锡的有机衍生物是四苯基锡。