Patent ID: 6624123
Filing Date: 2003-09-23
Classification: C10M,C10N

Abstract:
A hydraulic fluid comprising:1) a predominant amount of an hydraulic oil having a viscosity suitable for lubrication; and 2) from 0.03% to 0.06% by weight in the hydraulic fluid of an agent improving filterability, corresponding to the following formula: Râ€”Z â€ƒwherein Z represents i) an ester of succinic acid comprising the reaction product of a succinic anhydride and an aliphatic polyhydric alcohol; or ii) a succinimide comprising the reaction product of a succinic anhydride and a polyamine, the said reaction product being after treated with a cyclic carbonate or boric acid; and R represents a polyisobutene having a molecular weight (Mn) of 500 to 2500 and an Mw/Mn ratio of 1 to 5.