Nonodorous ethylene homopolymers and copolymers having good...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/02 (2006.01) C08F 2/38 (2006.01) C08F 4/28 (2006.01) C08F 210/02 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2431886

The invention relates to a method for producing ethylene homopolymers and copolymers in a tubular reactor having at least two polymerisation zones, at temperatures of between 150 ~C and 350 ~C and pressures of between 500 and 5000 bar, using oxygen as an initiator. Said method is characterised in that at least one aliphatic ketone of general formula (I) is used as a molar mass regulator. The variable R1 in formula (I) represents a C1-C6 alkyl or a C3-C12- cycloalkyl. The invention also relates to ethylene homopolymers and copolymers that can be obtained using the inventive method and the use of the same for producing injection-moulded products in the fields of cosmetics, medicine and food.

L'invention concerne un procédé de fabrication d'homopolymères et de copolymères d'éthylène dans un réacteur tubulaire comportant au moins deux zones de polymérisation, à des températures de 150 à 350 ·C et des pressions de 500 à 5000 bar, ledit procédé faisant intervenir l'oxygène en tant qu'initiateur. Le procédé selon l'invention est caractérisé en ce qu'on fait intervenir une ou plusieurs cétones aliphatiques de la formule générale (I) en tant que régulateurs de masse molaires, R?1¿ étant un C¿1?-C¿6?-alkyl ou un C¿3?-C¿12?-cycloalkyl. L'invention concerne également les homopolymères et copolymères d'éthylène obtenus au moyen du procédé selon l'invention, ainsi que leur utilisation dans la fabrication de produits moulés par injection dans le domaine cosmétique, médical et alimentaire.

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