Elastic terpolymer and preparation method thereof

摘要

The present invention relates to an elastic terpolymer that can acquire good mechanical properties and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer, which is a copolymer comprising 40 to 70 wt % of ethylene, 20 to 50 wt % of a C3-C20 alpha-olefin, and 2 to 20 wt % of a diene as obtained in the presence of a catalyst comprising a vanadium compound, satisfies that: (i) the weight average molecular weight measured by GPC is 100,000 to 500,000; and (ii) in the monomer distribution of the copolymer determined by 13C NMR analysis, K given by a defined Equation 1 is 0.01 or less.

主权项

1. An elastic terpolymer, which is a copolymer of 40 to 70 wt % of ethylene, 20 to 50 wt % of a C3-C20 alpha-olefin, and 2 to 20 wt % of a diene as obtained in the presence of a catalyst comprising a vanadium compound, wherein the elastic terpolymer satisfies:
i) the weight average molecular weight measured by GPC is 100,000 to 500,000; ii) in the monomer distribution of the copolymer determined by 13C NMR analysis, K given by the following Equation 1 is 0 to 0.003,
K=[CCC]*[EEE]  [Equation 1] wherein [CCC] is the growth rate constant when the monomer distribution of the copolymer is “alpha-olefin-alpha-olefin-alpha-olefin”; and [EEE] is the growth rate constant when the monomer distribution of the copolymer is “ethylene-ethylene-ethylene”, and iii) the ethylene content x (wt %) of the polymer and the crystallization enthalpy y (ΔHc; J/g) measured by DSC satisfy the relational expression given by y=1.6x −79.86.