POLYMER, PROCESS FOR PREPARING POLYMER, COMPOSITION OF LUBRICATING OIL, AND CONCENTRATE FOR USING IN LUBRICATING OIL COMPOSITION Russian patent published in 1999 - IPC

FIELD: chemistry of polymers, more particularly ash-free dispersing addition agents. SUBSTANCE: polymer is prepared by polymerization of (a) one or more alkyl acrylates and alkyl metacrylates and (b) one or more hydroxyalkyl acrylates and hydroxyalkyl metacrylates. Regulation of relative with respect to weight of monomer components to obtain desired content of carbon atoms in side alkyl chains of metacrylate skeleton to obtain desired solubility of addition agent that allows for combination of dispersibility, proper engine starting in cold, low-temperature viscosity properties and neutral behavior with respect to fluoroelastomeric sealing materials of engine. EFFECT: improved properties of the lubricating oil. 29 cl, 10 ex, 4 tbl