申请人:Union Carbide Chemicals & Plastics Technology Corporation
公开号:US05527752A1
公开(公告)日:1996-06-18
A catalyst precursor is provided which is useful, when combined with a cocatalyst, in the manufacture of polyolefins. The catalyst precursor is of the formula: ##STR1## where M is a transition metal, preferably Zr or Hf; L is a substituted or unsubstituted, .pi. bonded ligand coordinated to M, preferably a cyclopentadienyl-type ligand; Q can be the same or different and is independently selected from the group consisting of --O, --NR, --CR.sub.2 and --S; Y is either C or S; Z is selected from the group consisting of --OR, --NR.sub.2, --CR.sub.3, --SR, --SiR.sub.3, --PR.sub.2 or H; n is 1 or 2; A is a univalent anionic group when n is 2 or W is a divalent anionic group when n is 1; R can be the same or different and is independently a group containing carbon, silicon, nitrogen, oxygen, and/or phosphorus where one or more R groups may be attached to the L substituent, preferably R is a hydrocarbon group containing from 1 to 20 carbon atoms, most preferably an alkyl, cycloalkyl or an aryl group and one or more may be attached to the L substituent; B is a bridging group selected from the group consisting of an alkylene or arylene group containing from 1 to 10 carbon atoms, germanium, silicon and alkyl phosphine; and m is 1 to 7, preferably 2 to 6, most preferably 2 or 3.
提供一种催化剂前体,与共催化剂结合使用,用于制造聚烯烃。该催化剂前体的化学式为:##STR1## 其中M是过渡金属,优选Zr或Hf;L是取代或未取代的π键配位到M的配体,优选环戊二烯基型配体;Q可以相同或不同,独立选择自--O、--NR、--CR.sub.2和--S的群组;Y是C或S;Z选自--OR、--NR.sub.2、--CR.sub.3、--SR、--SiR.sub.3、--PR.sub.2或H的群组;n为1或2;当n为2时,A是单价阴离子基团;当n为1时,W是二价阴离子基团;R可以相同或不同,独立是含碳、硅、氮、氧和/或磷的基团,其中一个或多个R基团可以附加到L取代基上,优选R是含有1到20个碳原子的碳氢基团,最好是烷基、环烷基或芳基,其中一个或多个可以附加到L取代基上;B是从1到10个碳原子的烷基或芳基基团、锗、硅和烷基膦的桥联基团;m为1到7,优选2到6,最好是2或3。