Patent ID: 6576726
Filing Date: 2003-06-10
Classification: C08F,Y10S

Abstract:
A catalyst composition for preparing linear isotactic polymers which have a structure of which the tacticity varies within the range of between 25 and 60% of [mmmm] pentad concentration, said catalyst composition containing a metal complex of general Formula I wherein the substituents have the following significations:R1-R7; linear or branched C1 to C10 alkyl, C5 to C7 cycloalkyl which, in its turn, can carry one or several C1 to C6 alkyl residues as substituent, C6 to C18 aryl or arylalkyl or alkylaryl, in which case R1/R2, R3/R4, R6/R7 can be partially or simultaneously integrated into C5 to C7 cycloalkyl or aryl rings fused thereto; R11 C1 to C8 alkyl, aryl, C1 to C8 oxyalkyl, C1 to C8 trialkylsiloxy; E â€”CH2CH2â€”, â€”CH2CH2CH2â€”, â€”CH2CH2CH2CH2â€”, â€”CR9R10â€”, â€”SiR9R10â€”, or GeR9R10â€”; wherein R9, R10 is a C1 to C8 alkyl, a C4 to C7 cycloalkyl or C4 to C7 aryl, in which case R9, R10 can be jointly with E, form a C4 to C7 cycloalkyl or C4 to C7 aryl; M titanium, zirconium, hafnium, vanadium, niobium, tantalum; X halogen or C1 to C8 alkyl, aryl, benzyl; and an activator.