method for the manufacture kleinteiliger homo - and copolymerisate of ethens using a liquid alkans as reaction medium.

摘要

A process is claimed for the continuous prodn. of ethene homopolymer or copolymer (I) with sec. amts. of 3-8C alpha-olefins, of particle size 0.3-1.5 mm (DIN 53477) and bulk density 0.4-0.6 g/cm3 (DIN 53468), by catalytic polymerisation at 60-100 deg.C and 30-50 bar in a circular-tube reactor with 4-8C alkane as reaction medium contg. dissolved monomer(s) and suspended (I) and with a circulating reacton mixt. to which reactants are added and from which (I) is recovered by removal of mixt. The novelty is that the mean concn. of (I) (Cm) in the circulation is kept in the range 0.4-0.7 g per g reaction mxit. and that reaction mixt. is removed at a point in the cycle where the concn. of (I) is from 0.5Cm to 0.7Cm.