Automotive fuel compositions

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 1/195 (2006.01) C10L 10/00 (2006.01)

Patent

CA 2719258

Use of a viscosity index (VI) improving additive, in an automotive fuel composition, for the purpose of improving the acceleration performance of an internal combustion engine into which the fuel composition is introduced. The additive may be used to increase the viscosity of the composition, by an amount greater than that which theory would have predicted to occur. The fuel composition is suitably a diesel fuel composition, and the additive suitably comprises a block copolymer which contains one or more monomer blocks selected from ethylene, propylene, butylene, butadiene, isoprene and styrene monomers. The additive is preferably used in the composition at a concentration of 0.5 %w/w or lower.

L'invention concerne l'utilisation d'un additif qui améliore l'indice de viscosité (VI) dans une composition de carburant pour automobile en vue d'améliorer les performances d'accélération d'un moteur à combustion interne dans lequel la composition de carburant est introduite. L'additif peut être utilisé pour augmenter la viscosité de la composition d'une valeur supérieure à celle que la théorie aurait prédite. De manière appropriée, la composition de carburant est une composition de carburant diesel et l'additif comprend de manière appropriée un copolymère séquencé qui contient une ou plusieurs séquences de monomères sélectionnés parmi des monomères d'éthylène, de propylène, de butylène, de butadiène, d'isoprène et de styrène. L'additif est de préférence utilisé dans la composition à une concentration de 0,5 % poids/poids ou moindre.

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