Continuous production of ethylene co polymers

摘要

The improvement is obtained by using a polymerisation regulator of relatively high Cs no. (1.75 x 10-2 - 4 x 10-1), close control of the addition of vinyl ester and polymerisation initiator. - The method is suitable for co-polymerisation of mixtures of 100 ppw. ethylene with 0.1 - 5.5 ppw. of a vinyl ester of a C2-C20 carboxylic acid at 150 - 350 degrees C and 1,500 - 4000 atmos. The reaction takes place in 2 steps. - 1st step: 100 ppw. ethylene +0.1 - 2.5 ppw. vinyl ester +2-100 mol-ppm of a free-radical polymerisation initiator +0.01 - 1 ppw regulator. - 2nd. step: 1.1 - 2 times the quantity of vinyl ester per 100 ppw ethylene +2-100 mol-ppm initiator +40 - 60% by wt. of the regulator used in the 1st. step.