Patent ID: 6376418
Filing Date: 2002-04-23
Classification: C08F,Y10S

Abstract:
A catalyst for producing polyolefins having a low molecular weight comprising:a) a metallocene compound described by the formula Râ€³(C5R4)(Râ€²2C5C4Râ€²4)MeQp wherein (C5R4) is a substituted cyclopentadienyl ring; (Râ€²2C5C4Râ€²4) is an indenyl ring; each R is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, a halogen, an alkoxy, and alkoxy alkyl or an alkylamino radical, each R may be the same or different, and each Râ€² is hydrogen; (C5R4) has one R substituent in a distal position which is at least as bulky as a t-butyl radical; Râ€³ is a structural bridge between the (C5R4) and (Râ€²2C5C4Râ€²4) rings to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IVB metal as positioned in the Periodic Table of Elements; and p is the valence of Me minus 2;b) an ionizing agent.