Method for producing ethylene copolymers in segmented...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/02 (2006.01) C08F 4/00 (2006.01) C08F 218/08 (2006.01) C10L 1/18 (2006.01) C08F 2/38 (2006.01)

Patent

CA 2311413

The invention relates to a method for producing ethylene/vinyl acetate copolymers in which a mixture comprised of ethylene and vinyl acetate is continuously polymerized in the presence of radical polymerization initiators and optional molecular weight modifiers in a cooled tubular reactor at a pressure ranging from 1000 to 3500 bar. The polymerization initiator is charged at the beginning and at a number of positions along the tubular reactor, and the temperature changes in the reaction mixture range no more than 20°C between the first maximum temperature and the last charging of the polymerization initiator along the tubular reactor.

L'invention concerne un procédé pour produire des copolymères d'éthylène/acétate de vinyle, dans lequel un mélange d'éthylène et d'acétate de vinyle est polymérisé en continu en présence d'initiateurs de polymérisation radicalaire et éventuellement de modificateurs de poids moléculaire dans un réacteur tubulaire refroidi, à une pression allant de 1.000 à 3.500 bars. L'initiateur de polymérisation est ajouté de manière dosée au début et en plusieurs endroits le long du réacteur tubulaire, et les variations de température du mélange de réaction, le long du réacteur tubulaire, entre la première température maximale et la dernière addition dosée de l'initiateur de polymérisation, se situent dans une plage maximale de 20 DEG C.

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