Process for the preparation of a high molecular weight olefin po

Details Process for the preparation of a high molecular weight olefin po Process for the preparation of a high molecular weight olefin po

1992-11-24

1994-07-12

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, 526170, 502155, C08F 464

Patent

active

053289692

ABSTRACT:
A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 is hydrogen, R.sup.4 to R.sup.6 are alkyl or aryl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n is a single- or multi-membered chain, in which R.sup.7 can also be a (substituted) hetero atom, and m+n is zero or 1.

REFERENCES:
patent: 5017714 (1991-05-01), Welborn, Jr.
patent: 5132262 (1992-07-01), Rieger et al.
Ewen, J. A., et al, J. Am. Chem. Soc. 109:6544-6545 (1987).

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