Importance

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Abstract

Use of metallocene catalyst component for the preparation of a syndiotactic polyolefin having a monomer length of up to C10, which component has the general formula: R'(C.sub.p R.sub.1 R.sub.2)(C.sub.p 'R.sub.1 'R.sub.2 ')MQ.sub.2 wherein C.sub.p is a cyclopentadienyl ring; C.sub.p ' is a 3,6 disubstituted fluorenyl ring; R.sub.1 and R.sub.2 are each independently H or a substituent on the cyclopentadienyl ring which is proximal to the bridge, which proximal substituent is linear hydrocarbyl of from 1 to 20 carbon atoms or a group of the formula XR*.sub.3 containing up to 7 carbon atoms in which X is chosen from Group IVA, and R* is the same or different and chosen from hydrogen or alkyl; R.sub.1 ' and R.sub.2 ' are each independently substituent groups on the fluorenyl ring, each of which is a group of the formula AR''.sub.3, in which A is chosen from Group IVA, and each R'' is independently hydrogen or a hydrocarbyl having 1 to 20 carbon atoms; M is a Group IVB transition metal or vanadium; each Q is hydrocarbyl having 1 to 20 carbon atoms or is a halogen; R' is a structural bridge imparting stereorigidity to the component and comprises the moiety TR.sub.a R.sub.b, in which T is chosen from group IVA, and each of R.sub.a and R.sub.b is independently (i) substituted or unsubstituted aryl linked to T directly or by C.sub.1 -C.sub.4 alkylene; or (ii) H.

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First Claim