Process for the preparation of a syndiotactic polyolefin
    44.
    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。