Process and catalyst for producing polyethylene having a broad molecular weight distribution

A process for producing polyethylene having a multimodal molecular weight distribution comprising polymerizing ethylene in the presence of a homogeneous catalyst system comprising:

• (a) at least two or more metallocenes represented by the general formula
• (C.sub.5 R'.sub.m).sub.p R".sub.s (C.sub.5 R'.sub.m)MeQ.sub.3-p or
• R".sub.s (C.sub.5 R'.sub.m).sub.2 MeQ',
• each having a different propagation and termination rate constant, and
• (b) an alumoxane wherein (C.sub.5 R'.sub.m) is a cyclopentadienyl or substituted cyclopentadienyl, each R' which can be the same or different is hydrogen or a hydrocarbyl radical selected from alkyl, alkenyl, aryl, alkylaryl, or arylalkyl radicals having from 1 to 20 carbon atoms or two carbon atoms of the cyclopentadienyl ring are joined together to form a C.sub.4 -C.sub.6 ring, R" is a C.sub.1 -C.sub.4 alkylene radical, a dialkyl germanium or silicone or alkyl phosphine or amine radical bridging two (C.sub.5 R'.sub.m) rings, each Q which can be the same or different is a hydrocarbon radical selected from aryl, alkyl, alkenyl, alkylaryl, or arylalkyl radicals having from 1 -20 carbon atoms or halogen and can be the same or different, Q' is an alkylidene radical having from 1 to about 20 carbon atoms, Me is a Group 4b, 5b or 6b metal, s is 0 or 1, p is 0, 1 or 2, s is 0 when p is 0, m is 4 when s is 1, m is 5 when s is 0.