Determining the melt-mass-flow rate of an ethylene polymer comprises generating a correlation between the heat conductivity- and melt-mass-flow rate- of the ethylene polymer and measuring the heat conductivity of the ethylene polymer

摘要

Determination of the melt-mass-flow rate of an ethylene polymer comprises (a) generating a correlation between the heat conductivity of the ethylene polymer in a heat exchanger and the melt-mass-flow rate of the ethylene polymer, where the individual measurements of the substance takes place with constant melt-mass-flow rate; (b) measuring the heat conductivity of the ethylene polymer in heat exchanger; and (c) evaluating the melt-mass-flow rate from step (b) and preparing the correlation. Determination of the melt-mass-flow rate of an ethylene polymer, which is obtained by the polymerization of ethyl or ethylene with further copolymers, at 140-350[deg] C and 40-350 MPa in a reactor under formation of an ethyl polymer, and subsequently cooling the polymer in a heat exchanger, comprises (a) generating a correlation between the heat conductivity of the ethylene polymer in the heat exchange and the melt-mass-flow rate of the ethylene polymer, where the individual measurements of the substance takes place with constant melt-mass-flow rate; (b) measuring the heat conductivity of the ethylene polymer in heat exchanger; and (c) evaluating the melt-mass-flow rate from the step (b) and preparing the correlation. An independent claim is included for the polymerization of ethylene or ethyl with further copolymers, by the above process.