Patent ID: 8436113

Claim:
A method for producing copolymer of ethylene, propylene, and styrene comprising: a solution polymerizing ethylene, propylene, and styrene under presence of C3 to C20 organic solvent and a catalyst composition including a transition metal catalyst represented by the following Formula 1 in a single reactor, or series or parallel 2nd continuous reactors: where, M is a group IV transition metal in a periodic table; Cp is a cyclopentadienyl ring, or a cyclopentadienyl containing fused ring that can form an η 5 -bond along with a central metal M, and the cyclopentadienyl ring or the cyclopentadienyl containing fused ring is optionally further substituted with at least one selected from the group consisting of (C1-C20) alkyl, (C6-C30) aryl, (C2-C20) alkenyl and (C6-C30) ar (C1-C20) alkyl; R 1 to R 4 and R 22 and R 23 are each independently hydrogen 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 the adjacent R 1 to R 4 optionally form an aliphatic ring, and monocyclic or polycyclic aromatic ring; X 1 and X 2 are each independently 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) artylthio, or R 11 to R 15 are each independently 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 the adjacent R 11 to R 15 optionally form an aliphatic ring, and monocyclic or polycyclic aromatic ring; and alkyl, aryl, cycloalkyl, aralkyl, alkoxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio, arylthio of the R 1 to R 4 , R 11 to R 15 , R 22 and R 23 , and X 1 and X 2 ; the rings optionally formed by binding adjacent R 1 to R 4 or adjacent R 11 to R 15 are optionally further substituted with at least one selected from the group consisting of 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 hydroxy.