Novel synthetic lube composition and process

C - Chemistry – Metallurgy – 10 – M

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253/128, 196/95

C10M 107/10 (2006.01) C10G 50/02 (2006.01)

Patent

CA 2027547

The thermal stability of synthetic lubricants composed of alpha-olefin oligomers is improved by reaction with an olefin such as decene or the lower molecular weight, non-lubricant range olefins produced in the course of the oligomerization of 1-alkenes. The alkylation of the tube range oligomer is carried out using acidic alkylation catalyst such as solid, open-pore catalyst, e.g., fluorided alumina. The improved lubricant compositions of the present invention comprise a high viscosity index liquid lubricant oligomer composition containing C30-C1300 hydrocarbons with at least one higher alkyl branch per oligomer molecule, the alkyl branch containing between 12 and 40 carbon atoms. In a preferred embodiment the novel alkylated lubricant composition has a methyl to methylene branch ratio of less than 0.19 and pour point below -15°C.

On améliore la stabilité thermique de lubrifiants synthétiques composés d'oligomères d'alpha-oléfines par réaction avec une oléfine telle que la décène ou les oléfines de faible masse moléculaire de la gamme non lubrifiante, produites au cours de l'oligomérisation de 1-alcènes. On procède à l'alcoylation de l'oligomère de la gamme lubrifiante à l'aide d'un catalyseur d'alcoylation acide tel qu'un catalyseur solide à pores ouverts, par exemple de l'oxyde d'aluminum fluoré. Les compositions lubrifiantes améliorées de l'invention comprennent une composition d'oligomère lubrifiant liquide d'indice de viscosité élevé, contenant des hydrocarbures C30-C1300 comportant au moins une ramification d'alcoyle inférieur contenant entre 12 et 40 atomes de carbone. Dans un mode de réalisation préféré, la nouvelle composition lubrifiante alcoylée a un rapport de ramification entre le méthyle et le méthylène inférieur à 0,19, ainsi qu'un point d'écoulement inférieur à -15 C.

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