Biodegradable branched synthetic ester base stocks and...

C - Chemistry – Metallurgy – 10 – M

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C10M 105/38 (2006.01) C10M 105/40 (2006.01) C10M 169/04 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2208219

A biodegradable lubricant which is prepared from: about 60-99 % by weight of at least one biodegradable synthetic ester base stock which comprises the reaction product of a branched or linear alcohol having the general formula R(OH)n, wherein R is an aliphatic or cyclo-aliphatic group having from about 2 to 20 carbon atoms and n is at least 2; and mixed acids comprising about 30 to 80 molar % of a linear acid having a carbon number in the range between about C5 to C12, and about 20 to 70 molar % of at least one branched acid having a carbon number in the range between about C5 to C13; wherein the ester base stock exhibits the following properties: at least 60 % biodegradation in 28 days as measured by the Modified Sturm test; a pour point of less than -25 °C; and a viscosity of less than 7500 cps at -25 °C; about 1 to 20 % by weight lubricant additive package; and about 0 to 20 % of a solvent.

On prépare un lubrifiant biodégradable avec: 60 à 99 % en poids d'au moins une base constituée d'esters synthétiques biodégradables comprenant le produit de réaction: d'un alcool ramifié ou linéaire de formule générale R(OH)n, où R représente un groupe aliphatique ou cyclo-aliphatique doté de 2 à 20 atomes de carbone environ, et où n vaut au moins 2; et d'acides mélangés comprenant 30 à 80 moles % environ d'un acide linéaire doté d'un nombre de carbones variant entre C5-12 environ, et environ 20 à 70 moles % d'au moins un acide ramifié doté d'un nombre de carbones variant entre C5-13, où la base constituée d'esters présente les propriétés suivantes: au moins 60 % de biodégradation en 28 jours, mesurée selon l'essai Sturm modifié, un point d'écoulement inférieur à -25 DEG C, une viscosité inférieure à 7500 cps à -25 DEG C; environ 1 à 20 % en poids d'un ensemble d'additifs pour lubrifiant; et 0 à 20 % environ d'un solvant.

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