Process for the preparation of a syndiotactic polyolefin
    14.
    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。

    Process for the preparation of polyolefins
    18.
    发明授权
    Process for the preparation of polyolefins 失效
    制备聚烯烃的方法

    公开(公告)号:US5672668A

    公开(公告)日:1997-09-30

    申请号:US107187

    申请日:1993-08-16

    摘要: A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or R.sup.a and R.sup.b, together with the atoms connecting them, can form a ring, at a temperature of from -60.degree. to 200.degree. C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac>1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I, ##STR1## in which M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are identical or different and are methyl or chlorine, R.sup.3 and R.sup.6 are identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, R.sup.4 and R.sup.5 are hydrogen or as defined for R.sup.3 and R.sup.6, or R.sup.4 forms an aliphatic or aromatic ring with R.sup.6, or adjacent radicals R.sup.4 form a ring of this type, and R.sup.7 is a ##STR2## radical, and m plus n is zero or 1.

    摘要翻译: 通过聚合或共聚式Ra-CH = CH-Rb的烯烃制备烯烃聚合物的方法,其中Ra和Rb相同或不同,并且是氢原子或具有1至14碳原子的烃基 原子或R a和R b与连接它们的原子一起在-60至200℃的温度下,在0.5至100巴的压力下,在溶液中,悬浮液中或在 在由外消旋混合物中内消旋金属茂或内消旋混合物形成的催化剂的存在下,作为过渡金属化合物和助催化剂,其中金属茂是化合物 其中M1是Zr或Hf,R1和R2是相同或不同的,是甲基或氯的式I,其中R 3和R 6相同或不同,是甲基,异丙基,苯基,乙基或三氟甲基 ,R 4和R 5是氢或如对R 3和R 6所定义,或者R 4与R 6或相邻的镭形成脂族或芳族环 ls R4形成这种类型的环,而R7是a