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公开(公告)号:US06342574B1
公开(公告)日:2002-01-29
申请号:US09665893
申请日:2001-03-26
IPC分类号: C08F11006
CPC分类号: C08L51/06 , C08F4/65912 , C08F10/00 , C08F10/06 , C08F110/06 , C08F255/00 , C08F255/02 , C08F290/042 , C08F297/08 , C08F297/083 , Y10S526/943 , C08F4/65927 , C08F2500/15 , C08F2500/03 , C08F2500/06 , C08F2500/09
摘要: A polyolefin composition is provided which consists essentially of isotactic polypropylene and, optionally, one or more comonomers, wherein the total comonomer content of the polyolefin composition is from 0 to 20 mole percent, and further, wherein the weight average branching index g′ for the lower molecular weight region of the polyolefin composition is less than 0.93. Additionally, a process is provided for producing a polyolefin composition comprising: a) contacting, in solution, at a temperature from about 90° C. to about 120° C., propylene monomers with a catalyst composition comprising a first chiral, stereorigid transition metal catalyst compound capable of producing isotactic polypropylene; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor under suitable polypropylene polymerization conditions using a second chiral, stereorigid transition metal catalyst capable of producing isotactic polypropylene; and c) recovering a branched olefin polymer.
摘要翻译: 提供了聚烯烃组合物,其基本上由等规聚丙烯和任选的一种或多种共聚单体组成,其中聚烯烃组合物的总共聚单体含量为0至20摩尔%,此外,其中重均分支指数g'为 聚烯烃组合物的较低分子量区域小于0.93。 此外,提供了一种用于制备聚烯烃组合物的方法,其包括:a)在约90℃至约120℃的温度下在溶液中使丙烯单体与催化剂组合物接触,所述催化剂组合物包含第一手性立体刚性过渡金属 能够产生全同立构聚丙烯的催化剂化合物; b)在合适的聚丙烯聚合条件下,使用能够产生全同立构的第二手性立体刚性过渡金属催化剂,在聚合反应器中将a)的产物与丙烯和任选的一种或多种可共聚的单体共聚 聚丙烯; 和c)回收支链烯烃聚合物。