Patent ID: 6028152
Filing Date: 2000-02-22
Classification: C07F,C08F,Y10S

Abstract:
A catalyst system for preparation of an olefin polymer comprising a cocatalyst and a metallocene in the meso-form or a meso:rac mixture, with meso:rac >1:99, as transition-metal compound, wherein the metallocene is a compound of the formula I ##STR10## in which M.sup.1 is a metal from group IVb, Vb or VIb of the Periodic Table,R.sup.1 and R.sup.2 are identical or different and are a hydrogen atom, a C.sub.1 -C.sub.10 -alkyl group, a C.sub.1 -C.sub.10 -alkoxy group, a C.sub.6 -C.sub.10 -aryl group, a C.sub.6 -C.sub.10 -aryloxy group, a C.sub.2 -C.sub.10 -alkenyl group, a C.sub.7 -C.sub.40 -arylalkyl group, a C.sub.7 -C.sub.40 -alkylaryl group, a C.sub.8 -C.sub.40 -arylalkenyl group or a halogen atom,the radicals R.sup.4 and R.sup.5 are identical or different and are a hydrogen atom, a halogen atom, a halogen atom, a C.sub.1 -C.sub.10 -alkyl group, which may be halogenated, a C.sub.6 -C.sub.10 -aryl group, which may be halogenated, and an --NR--.sub.2.sup.10, --SR.sup.10, --OSiR.sub.3.sup.10, --SiR.sub.3.sup.10 or --PR.sub.2.sup.10 radical in which R.sup.10 is a halogen atom, a C.sub.1 -C.sub.10 -alkyl group or a C.sub.6 -C.sub.10 -aryl group,R.sup.3 and R.sup.6 are identical or different and are as defined for R.sup.4, with the proviso that R.sup.3 and R.sup.6 are not hydrogen,or two or more of the radicals R.sup.3 to R.sup.6, together with the atoms connecting them, form a ring system, ##STR11## where R.sup.11, R.sup.12 and R.sup.13 are identical or different and are a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.10 -alkyl group, a C.sub.1 -C.sub.10 -fluoroalkyl group, a C.sub.6 -C.sub.10 -aryl group, a C.sub.6 -C.sub.10 -fluoroaryl group, a C.sub.1 -C.sub.10 -alkoxy group, a C.sub.2 -C.sub.10 -alkenyl group, a C.sub.7 -C.sub.40 -arylalkyl group, a C.sub.8 -C.sub.40 -arylalkenyl group or a C.sub.7 -C.sub.40 -alkylaryl group, or the pair of R.sup.11 and R.sup.12, or R.sup.11 and R.sup.13, in each case together with the atoms connecting them, form a ring, andM.sup.2 is silicon, germanium or tin,R.sup.8 and R.sup.9 are identical or different and are as defined for R.sup.11, andm and n are identical or different and are zero, 1 or 2, where m plus n is zero, 1 or 2.