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

1992-08-24

1994-01-11

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526160, 526161, 526351, 526352, 502117, C08F 206, C08F 464

Patent

active

052782646

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 (1988-09-01), Kaminsky et al.
patent: 5001205 (1991-03-01), Hoel
patent: 5081322 (1992-01-01), Winter et al.
patent: 5120867 (1992-06-01), Welborn, Jr.
patent: 5145819 (1992-09-01), Winter et al.
Ewen, J. A. et al, J. Am. Chem. Soc. 109:6544-6545 (1987).

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