Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
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.
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patent: 5081322 (1992-01-01), Winter et al.
patent: 5120867 (1992-06-01), Welborn, Jr.
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Ewen, J. A. et al, J. Am. Chem. Soc. 109:6544-6545 (1987).
Antberg Martin
Rohrmann Jurgen
Spaleck Walter
Hoechst AG
Schofer Joseph L.
Wu David
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