Catalyst and process for the polymerization and copolymerization of
olefins
    12.
    发明授权
    Catalyst and process for the polymerization and copolymerization of olefins 失效
    用于烯烃聚合和共聚的催化剂和方法

    公开(公告)号:US5985784A

    公开(公告)日:1999-11-16

    申请号:US18497

    申请日:1998-02-04

    摘要: A highly effective catalyst system for the polymerization or copolymerization of olefins comprises at least one metallocene as transition-metal compound and at least one aluminum compound of the formula II ##STR1## and/or of the formula (III) ##STR2## where, in the formulae (II) and (III), the radicals R.sup.14 may be identical or different and are an alkyl group, an aryl group, benzyl or hydrogen, and p is an integer from 2 to 50, and at least one aluminum compound of the formula IV ##STR3## where R.sup.15, R.sup.16 and R.sup.17 are identical or different and are a hydrogen atom, an alkyl group, an alkylsilyl group, an alkoxy group, an aryl group, an aryloxy group, an alkenyl group, an arylalkyl group, an alkylaryl group, an arylalkenyl group, a halogen atom or a radical of the formula --OSiR.sup.15 R.sup.16 R.sup.17 where R.sup.15, R.sup.16 and R.sup.17 are as defined in the description.

    摘要翻译: 用于烯烃聚合或共聚的高效催化剂体系包括至少一种茂金属作为过渡金属化合物和至少一种式II和/或式(III)的铝化合物,其中在式(II)和 (III)中,基团R14可以相同或不同,为烷基,芳基,苄基或氢,p为2-50的整数,至少一种式IV的铝化合物,其中R 15,R 16 R 17相同或不同,为氢原子,烷基,烷基甲硅烷基,烷氧基,芳基,芳氧基,烯基,芳基烷基,烷基芳基,芳基烯基,卤素 原子或式-OSiR15R16R17的基团,其中R15,R16和R17如说明书中所定义。

    Process for the preparation of a syndiotactic polyolefin
    20.
    发明授权
    Process for the preparation of a syndiotactic polyolefin 失效
    制备聚合物聚烯烃的方法

    公开(公告)号:US5132381A

    公开(公告)日:1992-07-21

    申请号:US490833

    申请日:1990-03-08

    摘要: A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b in the presence of a catalyst consisting of a metallocene of the formula I ##STR1## and an aluminoxane. This polyolefin has a very high syndiotactic index. At a low polymerization temperature, a polyolefin having a low average molecular weight and narrow molecular weight distribution is obtained, and at a high polymerization temperature a polymer having a high average molecular weight and a wide molecular weight distribution is obtained.Shaped articles produced from the polymers are distinguished by a high transparency, flexibility, tear strength and excellent surface gloss.

    摘要翻译: 在由式I(I)的茂金属和铝氧烷组成的催化剂的存在下,通过式R a -CH = CH-R b的烯烃的聚合或共聚,可以高产率获得间同立构聚烯烃。 该聚烯烃具有非常高的间同立构指数。 在低聚合温度下,获得具有低平均分子量和窄分子量分布的聚烯烃,并且在高聚合温度下获得具有高平均分子量和宽分子量分布的聚合物。 由聚合物制成的成型品通过高透明度,柔韧性,撕裂强度和优异的表面光泽来区分。