Patent ID: 8748547

Claim:
A method of preparing an olefin copolymer comprising ethylene and 1-octene, having a) a density (d) defined by Equation: 10 3 ×d≦−1.8×A+937 (wherein d is a density of copolymer and A is a weight percentage of 1-octene in the copolymer); and b) a molecular weight distribution (Mw/Mn) of less than 3.5, and wherein, the density of the copolymer is 0.86 to 0.89 g/cc, and the olefin copolymer satisfying Equation: r 1 r 2 <1 wherein the r 1 and r 2 are monomer reactivity ratios, defined by r 1 =k 11 /k 12 , r 2 =k 22 /K 21 , k 12 is the growth reaction rate constant when monomer 2 is added to a growing chain, of which a terminal active site is monomer 1, and k 11 , k 21 , and k 22 are also growth reaction rate constants, defined by the same method, wherein the olefin copolymer is prepared by polymerizing ethylene and 1-octene using a catalyst composition containing a transition metal compound of the following Formula 1, and the polymerization is performed at a temperature of 140 to 170° C.: wherein, in formula 1, R1, R1′, R2, R2′, R3, R3′ and R3″ are the same as or different from each other, and are each independently hydrogen; halogen radical; an alkyl having 1 to 20 carbon atoms, aryl or silyl radical; an alkenyl having 2 to 20 carbon atoms, alkylaryl, or arylalkyl radical; a Group 14 metalloid radical substituted with hydrocarbyl; an alkoxy, aryloxy or amino radical, in which two or more thereof are connected to each other by an alkylidene radical containing an alkyl having 1 to 20 carbon atoms or aryl radical to form an aliphatic or aromatic ring, CY1 is a substituted or unsubstituted aliphatic or aromatic ring, in which CY1 is substituted with hydrogen; a halogen radical; or an alkyl having 1 to 20 carbon atoms or aryl radical, and in the case where CY1 is substituted with the plural substituents, two or more substituents are connected to each other to form an aliphatic or aromatic ring; M is a Group 4 transition metal; and Q1 and Q2 are the same as or different from each other, and are each independently a halogen radical; an alkyl amido having 1 to 20 carbon atoms or aryl amido radical; alkyl having 1 to 20 carbon atoms, alkenyl, aryl, alkylaryl or arylalkyl having 1 to 20 carbon atoms; or an alkylidene radical.