LUBRICATING MATERIAL WITH IMPROVED VISCOSITY INDEX AND METHOD FOR OBTAINING THEREOF Russian patent published in 2016 - IPC C10M161/00 C10M169/04 C10N20/04 C10N30/02 

FIELD: chemistry.

SUBSTANCE: groups I, II or II or poly-alpha-olefin of Group IV, ester oil in amount 5 wt % counted per the total quantity of lubricating material; and polyalkyl(meth)acrylate copolymer in amount 12.78-14.2 wt % counted per the total quantity of lubricating material, which has weigh average molecular weight from 29000 to 80000 g/mol and contains in copolymerised form a) mixture of monomers of C₁-C₄ alkyl(meth)acrylate in amount from 13 to 25 wt % counted per the total weight of mixture of monomers and b) mixture of monomers of C₆-C₁₅ alkyl(meth)acrylate in amount from 36 to 87 wt % counted per the total weight of mixture of monomers, in which weight ratio of said ester oil to said hydrocarbon oil is in the range from 1:1 to 1:100. The claimed invention also relates to method for obtaining lubricating material.

EFFECT: improvement of viscosity index of lubricating material.

15 cl, 14 ex, 11 tbl