LUBRICATING OIL COMPOSITION FOR SLIDING GUIDE SURFACE Russian patent published in 2019 - IPC C10M169/04 C10M141/10 C10M129/40 C10N30/04 C10N30/06 C10N40/08 

FIELD: chemistry.

SUBSTANCE: composition is a base oil belonging to group III in API base oil categories, secondary phosphite represented by formula (1), where R₁ denotes a saturated or unsaturated alkyl group having 9–18 carbon atoms and a fatty acid represented by formula (2), where R₂ denotes a saturated or unsaturated alkyl group having 9–17 carbon atoms, in which secondary phosphite is contained in amount of 0.05 wt. % to 3 wt. % with respect to the total amount of the composition, and the fatty acid is contained in amount of 0.01 wt. % to 2 wt. % with respect to the total amount of the composition.

(1)

R₂COOH (2).

EFFECT: present invention relates to a lubricating oil composition and its use for lubrication of the sliding guide surface, which has demonstrated excellent characteristics of low friction coefficient and extreme-pressure characteristics so as to ensure high accuracy of processing on the machine.

3 cl, 3 tbl