Process for the preparation of a syndiotactic polyolefin

Details Process for the preparation of a syndiotactic polyolefin Process for the preparation of a syndiotactic polyolefin

1992-10-15

1993-08-24

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, 502152, C08F 444

Patent

active

052390225

ABSTRACT:
A very active catalyst system for olefin polymerization is composed of 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 and R.sup.4 are hydrogen, R.sup.5 and R.sup.6 are alkyl or haloalkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n -- is a single-membered or multimembered chain in which R.sup.7 may furthermore be a (substituted) hetero atom, m+n is zero or 1 and R.sup.10 is hydrogen. The catalyst system gives polymers having high stereospecificity and a high melting point.

REFERENCES:
patent: 4522982 (1985-06-01), Ewen
patent: 4769510 (1988-09-01), Kaminsky et al.
patent: 4871705 (1989-10-01), Hoel
patent: 5081322 (1992-01-01), Winter et al.

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