Functional fluid compositions

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 169/04 (2006.01) C10M 105/04 (2006.01)

Patent

CA 2646587

The present invention relates to a fluid composition comprising (a) from 70 to 99.99% by weight, based on the total hydraulic fluid composition, of a readily biodegradable base oil composition comprising (i) from 80 to 100% by weight a base oil or base stock having a paraffin content of greater than 80% by weight paraffins and a saturates content of greater than 98% by weight and comprising a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 15 and 35, and having a kinematic viscosity at 100°C of at most 5.5 mm2/s; and (ii) of from 0 to 20% by weight of an ester of a polyhydroxy compound, calculated on the base oil composition; and (b) a viscosity index improver in an amount of from 0.01 to 30% by weight, based on the total hydraulic fluid composition, wherein the hydraulic fluid composition has a viscosity index in the range of from 50 to 1000, and a pour point of below or at -30°C.

La présente invention concerne une formule de fluide comprenant (a) entre 70 et 99,99 % en poids, par rapport au total de la formule de fluide hydraulique, d'une formule d'huile de base facilement biodégradable comprenant (i) entre 80 et 100 % en poids d'une huile de base de teneur en paraffine supérieure à 80 % en poids de paraffine et de teneur en composés saturés supérieure à 98 % en poids et comprenant une série d'isoparaffines comportant n, n+1, n+2, n+3 et n+4 atomes de carbone, n étant compris entre 15 et 35, et de viscosité cinématique à 100 °C d'au maximum 5,5 mm2/s ; et (ii) entre 0 et 20 % en poids d'un ester de polyol, par rapport à la formule d'huile de base ; et (b) un agent améliorant l'indice de viscosité à une teneur comprise entre 0,01 et 30 % en poids, par rapport au total de la formule de fluide hydraulique, la formule de fluide hydraulique présentant un indice de viscosité compris entre 50 et 1000, et une température de figeage inférieure ou égale à - 30 °C.

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