HYDRAULIC OIL FOR USE IN CONSTRUCTION EQUIPMENT Russian patent published in 2012 - IPC C10M145/14 C10M171/00 C10N40/08 

FIELD: chemistry.

SUBSTANCE: hydraulic oil used in construction equipment contains poly(meth)acrylate with weight-average molecular weight ranging from 30000 to 100000 in high-purity base oil, but does not contain an agent which enhances lubricating properties. Kinematic viscosity of the oil at 60°C ranges from 25 to 60 mm²/s, kinematic viscosity at 80°C ranges from 15 to 34 mm²/s, viscosity index ranges from 200 to 220, and low-temperature spinning viscosity at -25°C ranges from 1000 to 8000 mPa.s.

EFFECT: high kinematic viscosity in the high-temperature range, despite lack of an agent which enhances lubricating properties, thus achieving satisfactory operating efficiency and excellent braking characteristics, while simultaneously improving low-temperature characteristics.

10 cl, 2 tbl, 7 ex