Process for producing liquid ethylene-type random copolymers

A process for producing liquid random copolymers comprising copolymerizing ethylene and an alpha-olefin having 3 to 20 carbon atoms in the presence of a catalyst comprising a hydrocarbon solvent soluble stereorigid metallocene compound effective in copolymerizing said ethylene and alpha olefin to produce a liquid random copolymer described by the formula:

• (CpR.sub.4)R"(CpR'.sub.4)MeQ.sub.2
• wherein each (CpR.sub.4) and (CpR'.sub.4) is a cyclopentadienyl or substituted cyclopentadienyl ring;
• each R and R' is the same or different and is hydrogen or a hydrocarbyl radical having 1-20 carbon atoms or two R or two R' together form a hydrocarbyl radical having 2-20 carbon atoms;
• R" is a structural bridge between (CpR.sub.4 and (CpR'.sub.4) imparting stereorigidity to the compound;
• Me is a transition metal of Group IVb of the periodic table;
• and each Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen
• and a mixture of alumoxane and an alkyl aluminum in an amount to provide a molar ratio of aluminum to transitional metal between about 50 and 500 and wherein up to 90 mole % of the aluminum present in said mixture is in the alkyl aluminum to produce liquid random copolymer which is liquid at ambient temperature conditions.