Process and catalyst for producing reactor blend polyolefins

A homogeneous catalyst system for the simultaneous production of a polymer blend in a single polymerization reactor of two or more polymers comprising polyethylene and an ethylene-alpha-olefin copolymer, said catalyst comprising:

• (a) at least two 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 different reactivity ratios, and
• (b) and 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 such as alkyl, alkenyl, aryl, alkylaryl, or arylakyl radicals having form 1 to 20 carbon atoms or two carbon atoms 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 an alkyl phosphine or amine radical bridging two (C.sub.5 R'.sub.m) rings, Q is a hydrocarbon radical such as aryl, alkyl, alkenyl, alkylaryl, or arylakyl 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 transition metal of Group 4b, 5b and 6b, s is 0 or 1, p is 0, 1 or 2, when p=0, s=0, m is 4 when s is 1, m is 5 when s is 0.