| abstract |
The present invention relates to an elastic terpolymer which can satisfy excellent processability and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer is a copolymer of 40 to 70 weight% of ethylene, 15 to 55 weight% of a C 3 -C 20 alpha-olefin, and 0.5 to 20 weight% of a diene obtained in the presence of a group 4 transition metal catalyst, of which i) the weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) ”tan´, the difference between the tan´ values at the angular frequencies of 0.2 rad/s and 100.0 rad/s, is 0.5 or less that is measured at 100 °C by using a rubber process analyzer. |