Process for the production of gel-free ethylene/vinyl...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 210/02 (2006.01) C08F 218/08 (2006.01)

Patent

CA 2126801

Gel-free ethylene/vinyl acetate copolymers with a high content of copolymerized vinyl acetate and a high Mooney viscosity are produced by carrying out the poly-merization in solution in the presence of 20 to 45% by weight tert.butanol, based on the reaction solution, at temperatures of 50 to 80°C and under pressures of 300 to 450 bar using azo compounds in a cascade of stirred reactors with an average residence time of the reaction solution in the reactor cascade of 5 to 9 hours and a conversion of 50 to 70% by weight, based on the vinyl acetate used. The ethylene/vinyl acetate copolymers produced by the process according to the invention may be used for the production of vulcanizates having improved mechanical properties.

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