公开(公告)号：US5869418A

公开(公告)日：1999-02-09

申请号：US745049

申请日：1996-11-07

申请人： Eero Iiskola ,  Paivi L. Pitkanen ,  Timo Leinonen ,  Jukka Tulisalo ,  Mika Harkonen ,  Ann Britt Bjaland ,  Tarja Soderberg ,  Pirjo Jaaskelainen

发明人： Eero Iiskola ,  Paivi L. Pitkanen ,  Timo Leinonen ,  Jukka Tulisalo ,  Mika Harkonen ,  Ann Britt Bjaland ,  Tarja Soderberg ,  Pirjo Jaaskelainen

IPC分类号： C08F4/658 ,  C08F10/00 ,  B01J31/00 ,  B01J37/00 ,  C08F4/02 ,  C08F4/60

CPC分类号： C08F10/00

摘要： Olefins or mixtures of olefins, particularly propene or mixtures of propene advantageously with ethene, can be polymerized using a Ziegler-Natta catalyst system containing, besides a transition-metal-based procatalyst and cocatalyst which is an organometallic compound, a compound particularly suited for controlling the stereospecificity of the produced polymer. Such a compound called an external donor may also have other effects. By using an acetal derivative of an aldehyde that has two ether groups for this purpose, advantageously selected from the group of dialkoxyphenylalkanes, e.g., dimethoxyphenylpropane, a good stereospecificity of the product is attained combined with the high hydrogen sensitivity of the catalyst system, whereby the use of hydrogen as the chain transfer agent offers an easy control method of the molecular weight of the product by means of adjusting the amount of hydrogen available in the polymerization reaction. The acetal derivative is a compound according to formula (III): ##STR1## wherein R is C.sub.1-4 alkyl group, R.sup.1 and R.sup.2 are the same or different and each is a hydrocarbon group or a group which can together form a ring, R.sup.3 is hydrogen or a hydrocarbon group. If with the acetal derivative donor is used a clearly less hydrogen sensitive donor, e.g., alkoxysilanes, much broader MWD's of the product are achieved.

摘要翻译： 烯烃或烯烃的混合物，特别是丙烯或丙烯与丙烯的混合物有利地与乙烯可以使用齐格勒 - 纳塔催化剂体系进行聚合，除了基于过渡金属的前催化剂和作为有机金属化合物的助催化剂之外，还特别适用于控制 产生的聚合物的立体定向性。 称为外部供体的这种化合物也可以具有其它作用。 通过使用具有两个醚基团的醛的缩醛衍生物用于此目的，有利地选自二烷氧基苯基烷烃例如二甲氧基苯基丙烷，产物的良好立体定向性与催化剂体系的高氢敏感性相结合，由此 使用氢作为链转移剂通过调节聚合反应中可用的氢的量提供了产物分子量的容易控制方法。 缩醛衍生物是根据式（III）的化合物：其中R是C 1-4烷基，R 1和R 2相同或不同，并且各自是烃基或可以一起形成 R 3是氢或烃基。 如果与缩醛衍生物供体一起使用明显较少的氢敏供体，例如烷氧基硅烷，则可获得更广泛的产物MWD。