Patent ID: 9611349
Date: 2017-04-04
CPC Classifications: C08F,C08J

Claim:
1. A method of preparing an elastic terpolymer, comprising the steps of: copolymerizing a monomer composition including 40 to 70% by weight of ethylene, 15 to 55% by weight of alpha olefin having 3 to 20 carbon atoms, and 0.5 to 20% by weight of diene in the presence of a metallocene catalyst and a solvent in a polymerization reactor so as to prepare a polymer solution including an ethylene-alpha olefin-diene-based copolymer; and separating the solvent and unreacted monomers from the polymer solution by sequentially using an anhydrous gas-liquid separator and a steam stripper so as to recover the ethylene-alpha olefin-diene-based copolymer, wherein 40 to 70% by weight of the total weight of all materials excluding the total polymer included in the polymer solution are separated and removed in the anhydrous gas-liquid separator, and a residual solvent and unreacted monomers are separated and removed in the steam stripper, wherein the method comprises a process of removing the solvent and unreacted monomers from the polymer solution under conditions of a temperature of 150 to 160° C. and a pressure of 5 to 10 bar in an upper portion of the anhydrous gas-liquid separator, and wherein the method comprises a process of removing the residual solvent and unreacted monomers, that are passed through the anhydrous gas-liquid separator, by applying steam as a carrier gas under conditions of a temperature of 140 to 180° C. and a pressure of 4 to 10 bar in the steam stripper.