Supported metallocene catalysts
    1.
    发明授权
    Supported metallocene catalysts 有权
    负载金属茂催化剂

    公开(公告)号:US06855783B2

    公开(公告)日:2005-02-15

    申请号:US10412372

    申请日:2003-04-11

    摘要: Supported metallocene catalysts and processes for the use of such catalysts in isotactic polymerization of a C3+ ethylenically unsaturated monomer. The supported catalysts comprise a particulate silica support, an alkyl alumoxane component, and a metallocene catalyst component. The support has an average particle size of 10-50 microns, a surface area of 200-800 m2/g and a pore volume of 0.9-2.1 milliliters per gram (ml/g). Alumoxane is incorporated onto the support to provide a weight ratio of alumoxane to silica of at least 0.8:1. The metallocene is present in an amount of at least 1 weight percent of the silica and the alumoxane and is of the formula B(CpRaRb)(Fl′)MQ2 in which Fl′ is an unsubstituted fluorenyl group or a fluorenyl group symmetrically substituted at the 3 and 6 positions, B is a structural bridge between Cp and Fl′, Ra is a bulky substituent in a distal position, Rb is a less bulky substituent proximal to the bridge and non-vicinal to the distal substituent, M is a Group IVB transition metal or vanadium, and Q is a halogen or a Cl-C4 alkyl group.

    摘要翻译: 负载型金属茂催化剂和在C3 +烯属不饱和单体的全同立构聚合中使用这种催化剂的方法。 载体催化剂包括颗粒二氧化硅载体,烷基铝氧烷组分和茂金属催化剂组分。 载体的平均粒度为10-50微米,表面积为200-800平方米/克,孔体积为0.9-2.1毫升/克(毫升/克)。 将Alumoxane加入到载体上以提供至少0.8:1的铝氧烷与二氧化硅的重量比。 金属茂的存在量为二氧化硅和铝氧烷的至少1重量%,并且具有式B(CpRaRb)(F1')MQ2,其中F1'是未取代的芴基或在该位置上对称取代的芴基 3和6位,B是Cp和Fl'之间的结构桥,Ra是远端位置的大体积取代基,Rb是靠近桥的较不庞大的取代基,而与远端取代基不相邻,M是IVB族 过渡金属或钒,Q是卤素或C 1 -C 4烷基。