Process for the preparation of an olefin polymer using metalloce

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

1992-10-14

1994-04-19

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, 526351, 502155, C08F 442

Patent

active

053046145

ABSTRACT:
A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I or Ia ##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 and R.sup.4 are hydrogen or alkyl, R.sup.5 and 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 with one or more members, in which R.sup.7 can also be a (substituted) heteroatom, and m+n is zero or 1.

REFERENCES:
patent: 5017714 (1991-05-01), Welborn, Jr.
patent: 5132262 (1992-07-01), Rieger et al.
Kaminsky, W. et al., Angew. Chem. Int. Ed. Engl. 24, 507-508 (1985).

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