Process for the preparation of an olefin polymer
AssigneeHoechst Aktiengesellschaft
InventorsWalter Spaleck, Jurgen Rohrmann, Martin Antberg
Life of this patent
Estimating the term…
Abstract
A very effective catalyst system for olefin polymerization consists of a cocatalyst, preferably an aluminoxane, and a metallocene of the formula (I) ##STR1## in which, preferably, M.sup.1 is Zr, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 to R.sup.6 are alkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n -- is a chain having one or more members, in which R.sup.7 can also be a (substituted) hetero atom, and m+n is zero or 1. The catalyst system leads to polymers of variable molecular weight and stereotacticity, depending on the substituents R.sup.3 to R.sup.6 chosen, at polymerization temperatures which are relevant in industry.
Claims20
A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and area hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or R.sup.a and R.sup.b form a ring with the atoms joining them, at a temperature of -60.degree. to 200.degree. C., under 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 formed from a metallocene as the transition metal compound and a cocatalyst, which comprises using as the metallocene a compound of the formula I ##STR12## in which M.sup.1 is a metal of group IVb, Vb or VIb of the Periodic Table,
- R.sup.1 and R.sup.2 are identical or different and are hydrogen, 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,
- R.sup.3 and R.sup.4 are identical or different and are a halogen atom, a C.sub.1 -C.sub.10 -alkyl group, which can be halogenated, a C.sub.6 -C.sub.10 -aryl group or 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.5 and R.sup.6 are identical or different and have the meaning mentioned for R.sup.3 and R.sup.4, and additionally can also be hydrogen,
- R.sup.7 is ##STR13## .dbd.BR.sup.11, .dbd.AlR.sup.11, --Ge--, --Sn--, --O--, --S--, .dbd.SO, .dbd.SO.sub.2, .dbd.NR.sup.11, .dbd.CO, .dbd.PR.sup.11 or .dbd.P(O)R.sup.11,
- in which
- 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 R.sup.11 and R.sup.12 or R.sup.11 and R.sup.13 in each case form a ring with the atoms joining them, or R.sup.11 or R.sup.12 with R.sup.8 or R.sup.9 in each case form a ring together with the atoms joining them,
- M.sup.2 is silicon, germanium or tin,
- R.sup.8 and R.sup.9 are identical or different and have the meaning mentioned for R.sup.11 and
- m and n are identical or different and are zero, 1 or 2, m plus n being zero, 1 or 2.
Dependencies are inferred from the claim text.