Process for the preparation of an olefin polymer

Details Process for the preparation of an olefin polymer Process for the preparation of an olefin polymer

1993-10-25

1994-07-12

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 7, 556 8, 556 9, 556 11, 556 14, 556 19, 556 21, 556 22, 556 27, 556 43, 556 58, 502117, 502152, 526129, 526160, C07F 728, C07F 900, C07F 1100

Patent

active

053290330

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.

REFERENCES:
patent: 4769510 (1981-09-01), Kaminsky et al.
patent: 5001205 (1991-03-01), Hoel
patent: 5081322 (1992-01-01), Winter et al.
patent: 5103030 (1992-04-01), Rohrmann et al.
patent: 5120867 (1992-06-01), Welborn, Jr.
patent: 5145819 (1992-09-01), Winter et al.
patent: 5268495 (1993-12-01), Riepl et al.
patent: 5276208 (1994-01-01), Winter et al.

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