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

A catalyst system for the (co)polymerization of ethylene to polyethylene having a broad and/or multimodal molecular weight distribution;

• said catalyst 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 for ethylene polymerization, 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, Q 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, when p is 0, s is 0;
• m is 4 when s is 1 and m is 5 when s is 0.