Tetraarylborate Compound, Catalyst Composition Comprising Same, and Method for Preparing Ethylene Homopolymers or Copolymers of Ethylene and a-Olefin by Using Same

A tetraarylborate compound represented by the following Formula 1:

• wherein
• B is a boron atom;
• Ar1 is (C6-C30)aryl, wherein the aryl of Ar1 may be further substituted by one or more substituents selected from the group consisting of (C1-C30)alkyl, halo(C1-C30)alkyl, and (C6-C30)aryl(C1-C30)alkyl;
• Ar2 is fluorine-substituted (C6-C30)aryl;
• R1 is hydrogen or (C1-C30)alkyl;
• and
• R2 is (C1-C30)alkyl, or R2 and R1 may be linked to each other to form a ring, wherein the ring may be further substituted by one or more substituents selected from the group consisting of (C1-C30)alkyl, (C1-C30)alkoxy, halo(C1-C30)alkyl, (C3-C30)cycloalkyl, (C1-C30)alkyl(C6-C30)aryl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C30)alkyl(C6-C30)aryloxy, (C6-C30)aryl(C1-C30)alkyl, and ((C1-C30)alkyl(C6-C30)aryl)(C1-C30)alkyl.