Process for the manufacture of copolymers of ethylene and acrylic acid or mixtures of acrylic acid or mixtures of acrylic acid and acrylic acid esters

摘要

A process for the preparation of copolymers of ethylene with acrylic acid or mixtures of acrylic acid with acrylic esters (acrylates) by copolymerisation of 100 parts by weight of ethylene with from 0.5 to 25 parts by weight of acrylic acid or solutions of acrylic acid in acrylic esters in a continuous, tubular polymerisation system at pressures of from 500 to 3,000 bar and temperatures of from 150 to 300 DEG C in the presence of polymerisation initiators which decompose to form free radicals and optionally in the presence of polymerisation regulators, where the temperature regime for the reaction mixture comprising ethylene, acrylic acid or a solution of acrylic acid in acrylic esters after entry into the reaction zone is designed in such a way that the quotient dT/dt (increase in temperature per time unit) is set and kept constant at a value between 0.7 and 1.2 DEG C per second.