Patent ID: 6046286
Filing Date: 2000-04-04
Classification: B01J,C08F

Abstract:
A process for the free radical polymerization of ethylenically unsaturated monomers in an aqueous medium, which comprises:a) initially introducing mixing water employed for the polymerization and starting materials required for the polymerization, into a premixing apparatus and mixing them thoroughly to form a mixture, andbefore transferring the mixture into a olymerization container, heating the mixture up to a polymerization temperature, no thermal free radical initiator being initially introduced;b) transferring the mixture, which has been heated up to the polymerization temperature, into the polymerization container, the wall of which is kept at a temperature below the polymerization temperature, by cooling;feeding in the mixture and starting the polymerization by metering in the thermal free radical initiator, and during the polymerization metering in the thermal initiator; andc) after an end of the polymerization and after pressure compensation to a differential pressure of p.ltoreq.3 bar between the polymerization container and a degassing container, draining the polymer dispersion into the degassing container and degassing the dispersion by heating up or applying a vacuum.