Dispersants and dispersant viscosity index improvers from...

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 143/12 (2006.01) C10L 1/195 (2006.01) C10L 1/198 (2006.01) C10L 1/20 (2006.01) C10L 1/236 (2006.01) C10L 1/238 (2006.01) C10L 1/24 (2006.01) C10L 10/00 (2006.01) C10M 119/02 (2006.01) C10M 149/06 (2006.01) C10M 149/10 (2006.01) C10L 1/18 (2006.01) C10L 1/22 (2006.01)

Patent

CA 2221461

The invention provides dispersants and dispersant viscosity index improvers which include polymers of conjugated dienes which have been hydrogenated and functionalized. The dispersant substances include compositions including a copolymer of a ring substituted styrene and a conjugated diene. The polymers are selectively hydrogenated to produce polymers which have highly controlled residual amounts of aromatic unsaturation, permitting highly selective functionalization. Also provided are lubricant fluids, such as mineral and synthetic oils, which have been modified in their dispersancy and/or viscometric properties by means of the dispersant substances of the invention. Also provided are methods of modifying the dispersancy and/or viscometric properties of lubricating fluids such as mineral and synthetic lubricating oils. The dispersant substances may also include a carrier fluid to provide dispersant concentrates.

La présente invention concerne des dispersants et des promoteurs de l'indice de viscosité des dispersants, comprenant des polymères de diènes conjugués, qui ont été hydrogénés et fonctionnalisés. Les substances dispersantes comprennent des compositions comprenant un polymère d'un styrène de substitution et un diène conjugué. Les polymères sont hydrogénés sélectivement de manière à obtenir des polymères contenant des quantités résiduelles très régulées d'insaturation aromatique, d'où une fonctionnalisation hautement sélective. L'invention concerne aussi des lubrifiants fluides tels que les huiles minérales et synthétiques, dont la capacité dispersante et/ou la viscométrie ont été modifiées au moyen d'agents dispersants selon l'invention. Elle concerne enfin des procédés permettant de modifier la capacité dispersante et/ou la viscométrie de fluides lubrifiants tels que les huiles minérales et synthétiques. Les substances dispersantes peuvent également comprendre un fluide porteur de manière à obtenir des concentrés de dispersant.

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