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AssigneeBASF SE
InventorsAndreas Deckers, Bernd Wenderoth, Peter Wedel, Wilhelm Weber
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In a process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and, if desired, molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and the poly-merization initiator is added at the beginning and at two or more points along the tube reactor, and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20° C.
A process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and optional molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and where the polymerization initiator is added at the beginning and at two or more points along the tube reactor in respective amounts, so that the average maximum temperature in the reaction mixture is not more than 15° C. above the average minimum temperature between the first heating and last addition of the polymerization initiator and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20° C.
A process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and optional molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and where the polymerization initiator is added at the beginning and at two or more points along the tube reactor, wherein after each addition of polymerization initiator except the last addition of polymerization initiator, the temperature along the tube reactor rises and then cools prior to the next addition of polymerization initiator, and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20° C.
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