Method for preparing elastomeric copolymers of ethylene and α-olefins

A process for preparing copolymers of ethylene with α-olefin, having the density of 0.850˜0.910 by copolymerizing ethylene with (C3-C18) α-olefin in the presence of catalyst composition comprising transition metal compound catalyst represented by Chemical Formula (1) in a single reactor or continuous reactors connected in series or in parallel for 2-stage reaction:

• [In Chemical Formula (1),
• M represents transition metal from Group 4 in the Periodic Table of Elements;
• Cp represents cyclopentadienyl ring which is η5-linkable to the core metal M, or a fused ring containing a cyclopentadienyl ring, and the cyclopentadienyl ring or the fused ring containing a cyclopentadienyl ring may be further substituted by one or more substituent(s) selected from (C1-C20)alkyl, (C6-C30)aryl, (C2-C20)alkenyl and (C6-C30)ar(C1-C20)alkyl;
• R1 through R4 independently represent hydrogen atom, halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio or nitro, or each of R1 through R4 may be linked to an adjacent substituent via (C3-C12)alkylene or (C3-C12) alkenylene with or without containing a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring;
• Ar1 represents (C6-C30)aryl or (C3-C30)heteroaryl containing one or more heteroatom(s) selected from N, O and S;
• X1 represents halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)ar(C1-C20)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, or
• X2 represents
• R11 through R15 independently represent hydrogen atom, halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio or nitro, or each of R11 through R15 may be linked to an adjacent substituent via (C3-C12)alkylene or (C3-C12) alkenylene with or without containing a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring;
• and
• the alkyl, aryl, cycloalkyl, aralkyl, alkoxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio or arylthio of R1 through R4, R11 through R15, X1 and X2;
• the ring formed by linkage of each of R1 through R4 or R11 through R15 to an adjacent substituent via alkylene or alkenylene;
• or the aryl or heteroaryl of Ar1 and Ar11 may be further substituted by one or more substituent(s) selected from halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, nitro and hydroxyl.]