Radikalische hochdruckpolymerisation von ethylen im zweiphasensystem

Abstract

In order to modify the properties of low density polyethylene (LDPE), the radically initiated polymerization of ethylene can be performed at pressures below 1200 bar and moderately high temperatures. Under such conditions the reaction mixture separates into a less dense phase, rich in monomer, and a dense phase, rich in polymer. The polymerization proceeds mainly in the monomer-rich phase. When the polymer concentration exceeds the solubility limit, polymer precipitates from the monomer-rich phase and moves into the polymer-rich phase. By polymerization under two-phase conditions, polyethylene resins with a narrow molecular weight distribution can be obtained. Einleitung