LUBRICANT OIL Russian patent published in 1995 - IPC

FIELD: lubricant materials. SUBSTANCE: product: lubricant oil with high viscosity index for internal combustion engine. Oil has 0.6-1.5 wt.-% polymeric mixture containing linear diblock-copolymer of styrene and hydrogenated isoprene at molecular mass of polystyrene blocks 35-44 x 35-44·10³ and polyisoprene blocks at molecular mass 6.5-10.6 x 6,5-10,6·10⁴,. Polymeric mixture has radial polymer containing at least one chain consisting of block-copolymer of styrene and hydrogenated polyisoprene at the ratio polyisoprene block-copolymer (7:1)-(1:3). Molecular mass of polystyrene blocks and polyisoprene blocks is 10-91 x 10-91·10³, and 28-65 x 28-65·10³,, respectively. Mass ratio of radial polymer and linear diblock-copolymer changes from 1:4.5 to 4.9:1. EFFECT: enhanced quality of lubricant oil. 2 dwg, 11 tbl