Soluble catalyst systems for the preparation of polyalk-1-enes having
high molecular weights
    62.
    发明授权
    Soluble catalyst systems for the preparation of polyalk-1-enes having high molecular weights 失效
    用于制备高分子量聚烯-1-烯的可溶性催化剂体系

    公开(公告)号:US5514760A

    公开(公告)日:1996-05-07

    申请号:US375278

    申请日:1995-01-19

    摘要: Catalyst systems for the polymerization of C.sub.2 -C.sub.10 -alk-1-enes contain, as active components,a) a metallocene complex of the general formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X is halogen or C.sub.1 -C.sub.8 -alkyl, Y is carbon, phosphorus, sulfur, silicon or germanium, Z is C.sub.1 -C.sub.8 -alkyl, C.sub.3 -C.sub.10 -cycloalkyl or C.sub.6 -C.sub.10 -aryl, R.sup.1 and R.sup.2 are identical or different and are each C.sub.1 -C.sub.4 -alkyl, R.sup.3 to R.sup.6 are identical or different and are each hydrogen or C.sub.1 -C.sub.8 -alkyl, or two adjacent radicals R.sup.3 and R.sup.4 and R.sup.5 and R.sup.6 in each case together form a hydrocarbon ring system of 4 to 15 carbon atoms and n is 0, 1 or 2, andb) an open-chain or cyclic alumoxane compound of the general formula II or III ##STR2## where R.sup.7 is C.sub.1 -C.sub.4 -alkyl and n is from 5 to 30. The novel catalyst systems are particularly suitable for the preparation of polyalk-1-enes having high molecular weights.

    摘要翻译: 用于C2-C10-烷-1-烯的聚合的催化剂体系包含作为活性组分的a)通式I的茂金属络合物,其中M是钛,锆,铪,钒,铌或钽, X是卤素或C 1 -C 8烷基,Y是碳,磷,硫,硅或锗,Z是C 1 -C 8 - 烷基,C 3 -C 10 - 环烷基或C 6 -C 10 - 芳基,R 1和R 2是相同或不同的, 各自为C 1 -C 4 - 烷基,R 3至R 6相同或不同,并且各自为氢或C 1 -C 8 - 烷基,或两个相邻基团R 3和R 4以及R 5和R 6在每种情况下一起形成4至15的烃环体系 碳原子,n为0,1或2,以及b)通式II或III的开链或环状铝氧烷化合物(II)为5-30。新的催化剂体系特别适用于制备 的具有高分子量的聚酮-1-烯。

    Liquid-crystalline medium
    64.
    发明授权
    Liquid-crystalline medium 失效
    液晶介质

    公开(公告)号:US5389289A

    公开(公告)日:1995-02-14

    申请号:US201159

    申请日:1994-02-24

    摘要: The invention relates to a liquid-crystalline medium essentially comprisinga) 5-65% by weight of a component A, comprising two or more compounds selected from group A: ##STR1## b) 20-95% by weight of a component B comprising two or more compounds selected from group B: ##STR2## and c) 0-40% by weight of a component C, comprising one or more compounds having a clearing point above 170.degree. C., where R, X and Y each, independently of one another, have the following meanings:R is in each case alkyl, oxaalkyl, haloalkyl or alkenyl having up to 7 carbon atoms,X is F, Cl, CHF.sub.2, CF.sub.3, OCHF.sub.2 or OCF.sub.3, andY is H, F or Cl.

    摘要翻译: 本发明涉及一种液晶介质,其基本上包含a)5-65重量%的组分A,其包含两种或更多种选自组A的化合物:图像A1,图像A3,图像A4 b)20-95重量%的组分B,其包含两种或更多种选自组B的化合物的组分B:组分C,其包含一种或多种具有透明点的化合物 其中R,X和Y各自独立地具有以下含义:R是在各种情况下都是具有至多7个碳原子的烷基,氧杂烷基,卤代烷基或烯基,X是F,Cl,CHF 2 ,CF 3,OCHF 2或OCF 3,Y是H,F或Cl。