Patent ID: 6225425
Filing Date: 2001-05-01
Classification: C07F,C08F,Y10S

Abstract:
A process for the preparation of a syndio-isoblock polymer having molecular chains in which syndiotactic and isotactic sequences are present and the sequence length is 3 to 50 monomer units by polymerization of propylene or an olefin of the formula RCH.dbd.CHR' in which R and R' are identical or different and are an alkyl radical having 1 to 14 carbon atoms or R and R' combine with the carbon atoms joining them together to form a ring at a temperature of -60 to 100.degree. C., a pressure of 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst which is composed of a metallocene and an aluminoxane, wherein the metallocene is a compound of the formula I ##STR9##in whichM.sup.1 is titanium zirconium, hafnium, vanadium, niobium or tantalum,R.sup.1 and R.sup.2 are identical or different and are a hydrogen atom, a halogen atom, C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy, C.sub.6 -C.sub.10 -aryl, C.sub.6 -C.sub.10 -aryloxy, C.sub.2 -C.sub.10 -alkenyl, C.sub.7 -C.sub.40 -arylalkyl, C.sub.7 -C.sub.40 -alkylaryl or C.sub.8 -C.sub.40 -arylalkenyl,R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are identical or different and are a hydrogen atom, C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy, C.sub.6 -C.sub.10 -aryl, C.sub.6 -C.sub.10 -aryloxy, C.sub.2 -C.sub.10 -alkenyl, C.sub.7 -C.sub.40 -arylalkyl, C.sub.7 -C.sub.40 -alkylaryl, C.sub.8 -C.sub.40 -arylalkenyl or a halogen atom, with the proviso that at least one of the substitutents R.sup.3 through R.sup.8 is not hydrogen,R.sup.9 is ##STR10##.dbd.BR.sup.10, .dbd.AlR.sup.10, --Ge--, --Sn--, --O--, --S--, .dbd.SO, .dbd.SO.sub.2, .dbd.NR.sup.10, .dbd.CO, .dbd.PR.sup.10 or .dbd.P(O)R.sup.10, where R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.14 are identical or different and are a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -fluoroalkyl, C.sub.6 -C.sub.10 -fluoroaryl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy, C.sub.2 -C.sub.10 -alkenyl, C.sub.7 -C.sub.40 -arylalkyl, C.sub.8 -C.sub.40 -arylalkenyl, or C.sub.7 -C.sub.40 -alkylaryl, or R.sup.10 and R.sup.11, or R.sup.10 and R.sup.12, together in each case with the atoms joining them, form a ring, andM.sup.2 is silicon, germanium or tin.