| 摘要 |
A catalyst system for alphaolefin type polymerizations, includes at least one hindered alkyl metal amide compound having the formula R min 2YNR2 in combination with a Group IVA-VIII transition metal compound on a support and at least one Lewis base wherein R is C3 to C20 bulky alkyl, cycloalkyl, aralkyl, aryl or substituted aryl groups or R2N is a hindered cyclic amide group; R min is C1 to C20 primary alkyl, secondary alkyl, tertiary alkyl, neopentyl alkyl, branched alkyl, cycloalkyl or aralkyl groups, and Y is aluminium, gallium or indium. The catalyst system provides polymers having increased isotactic stereoregularity as well as lower catalyst residue. |
