| abstract |
The present invention relates to a long-chain branched elastic terpolymer capable of satisfying excellent processability and elasticity (flexibility) at the same time, which is obtained in the presence of a Group IV transition metal catalyst, and a preparation method thereof. The elastic terpolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, whereinn i) its weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) its LCB Index which is a ratio of 1 st harmonics of storage modulus to 5 th harmonics of storage modulus measured at 125° C. using a rubber process analyzer according to a LAOS (Large Angles of Oscillation and high Strains) method has a positive value. |