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AssigneeChemische Werke Huels Aktiengesellschaft
InventorsWolfgang Zaar, Manfred Schroeder, Gunther Maahs
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A process for preparing a copolymer by copolymerizing ethylene and at least one other 1-monoolefin and, optionally, and unconjugated diene in the presence of a mixed catalyst of (1) a compound of a metal of main Groups I-III of the periodic table having at least one hydrogen atom or an alkyl or aryl group bound to the metal atom, and (2) a compound of a metal of Subgroups IV-VI of the periodic table, comprises performing the copolymerization in the presence of an amount effective as an activator of a 2, 3,4,4-tetrachloro-2-butenoic acid ester of the fromula HCCl.sub.2 --CCl=CCl--COOR wherein R is an optionally halogenated alkyl, cycloalkyl, aryl, alkaryl or aralkyl group, and wherein the cycloalkyl, aryl, alkaryl or aralkyl groups are optionally substituted by one or more alkyl groups.
A process for preparing a copolymer by copolymerizing ethylene and at least one other 1-monoolefin and, optionally, an unconjugated diene in the presence of a mixed catalyst of (1) an alkyl aluminum halide of the formula AlR'.sub.n X.sub.3-n wherein X is chlorine or bromine, R' is alkyl of up to 6 carbon atoms, and n is a number from 1 to 2 inclusive, and (2) a vanadium compound soluble in organic solvents employable in the copolymerization, which comprises performing the copolymerization in the presence of an amount effective as an activator of a 2,3,4,4-tetrachloro-2-butenoic acid ester of the formula HCCl.sub.2 --CCl.dbd.CCl--COOR wherein R is a non-halogenated alkyl group.
Dependencies are inferred from the claim text.