| abstract |
The present invention relates to a ternary elastomeric copolymer having a long-chain branch, obtained in the presence of a group IV transition metal catalyst, and capable of achieving both excellent processability and excellent elasticity (flexibility), and a method for preparing the same. The ternary elastomeric copolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, i) having a weight average molecular weight of 100,000 to 500,000, measured by GPC; and ii) capable of having a positive value on the LCB index, which is the ratio of a first harmonic of the storage modulus of elasticity measured by a rubber process analyzer at 125°C, using the Large Angles of Oscillation and high Strains (LAOS) method, with respect to a fifth harmonic of the storage modulus of elasticity. |