Multifunctional viscosity index improver and dispersant

Details Multifunctional viscosity index improver and dispersant Multifunctional viscosity index improver and dispersant

C - Chemistry, Metallurgy

08

F

C08F 255/00 (2006.01) C08F 255/02 (2006.01) C08L 51/06 (2006.01) C10M 145/00 (2006.01)

Patent

CA 2458301

A process is disclosed that comprises solution grafting a hydrocarbon polymer prepared from at least C2 to C28 polymerizable hydrocarbon, said polymer having a number average molecular weight in the range of from about 5,000 to about 500,000, with an ethylenically unsaturated C3 to C10 carboxylic acid material, using a free radical initiator, in the presence of an aromatic ester oil of the formula (I) wherein R1, R2, R3, R4, R5, and R6 are independently selected from the group consisting of hydrogen, -COOR7, -COOR8, -COOR9, - COOR10, -COOR11, and -COOR12, provided that no more than 5 of R1, R2, R3, R4, R5 and R6 are hydrogen, and R7, R8, R9, R10, R11, and R12 are independently selected from the group consisting of alkyl and alkylesters.

L'invention concerne un procédé comprenant un greffage en solution d'un polymère hydrocarboné préparé à partir d'au moins un hydrocarbure polymérisable compris en C¿2?-C¿28?, ledit polymère présentant un poids moléculaire moyen en nombre compris dans la gamme allant d'environ 5,000 à environ 500,000, avec un acide carboxylique éthyléniquement insaturé en C¿3?-C¿10?, au moyen d'un initiateur radicalaire libre, en présence d'une huile ester aromatique de formule (I), dans laquelle R¿1?, R¿2?, R¿3?, R¿4?, R¿5? et R¿6? sont sélectionnés de manière indépendante dans le groupe renfermant l'hydrogène, -COOR¿7?, -COOR¿8?, -COOR¿9?, -COOR¿10?, -COOR¿11? et -COOR¿12?, pour autant que pas plus de 5 groupes parmi R¿1?, R¿2?, R¿3?, R¿4?, R¿5? et R¿6? soient de l'hydrogène et R¿7?, R¿8?, R¿9?, R¿10?, R¿11? et R¿12? sont sélectionnés de manière indépendante dans le groupe comprenant l'alkyle et des alkylesters.

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