Spherical components and catalysts for the polymerization of olefins
    23.
    发明授权
    Spherical components and catalysts for the polymerization of olefins 失效
    用于烯烃聚合的球形组分和催化剂

    公开(公告)号:US5508245A

    公开(公告)日:1996-04-16

    申请号:US979243

    申请日:1992-11-20

    CPC分类号: C08F10/00

    摘要: Spherical components of catalysts for the polymerization of olefins comprising:(a) a vanadium compound selected from the compounds of formula VOX.sub.2 Y or VX.sub.n Y.sub.n-4n, where X is Cl or Br and Y is Cl, Br OR or NR.sup.I.sub.2(b) MgCl.sub.2 in spherical form.Said components have an average diameter greater than 1 .mu.m, a surface area of at least 10 m.sup.2 /g, a porosity of at least 0.1 g/cm.sup.3 and an X-ray spectrum having particular characteristics.

    摘要翻译: 用于烯烃聚合的催化剂的球形组分包括:(a)选自式VOX2Y或VXnYn-4n的化合物的钒化合物,其中X是Cl或Br,Y是Cl,Br OR或NRI2(b)球形中的MgCl 2 形成。 所述组分具有大于1μm的平均直径,至少10m 2 / g的表面积,至少0.1g / cm 3的孔隙率和具有特定特征的X射线谱。

    Process for modifying the rac/meso ratio in a metallocene compound
    26.
    发明授权
    Process for modifying the rac/meso ratio in a metallocene compound 失效
    用于改变茂金属化合物中外消旋/内消旋比的方法

    公开(公告)号:US5892077A

    公开(公告)日:1999-04-06

    申请号:US895014

    申请日:1997-07-16

    IPC分类号: C07F17/00 C07F7/00

    CPC分类号: C07F17/00 Y10S526/943

    摘要: It is possible to modify the rac/meso ratio of a rac/meso mixture in a stereorigid, bridged metallocene compound by subjecting a rac/meso isomeric mixture directly obtained from the synthesis to selective decomposition of the undesired isomer in the presence of compounds having either acidic hydrogen atoms or reactive halogen atoms. This process allows to prepare chiral metallocenes in their pure racemic or meso isomeric form.

    摘要翻译: 可以通过使直接从合成中获得的外消旋/内消旋异构体混合物在具有任意一种化合物的化合物存在下选择性分解不需要的异构体来改变立体刚性桥连金属茂化合物中外消旋/内消旋混合物的外消旋/内消旋比 酸性氢原子或反应性卤素原子。 该方法允许以其纯外消旋或内消旋异构形式制备手性金属茂。