Patent ID: 6475964
Filing Date: 2002-11-05
Classification: C10M,C10N

Abstract:
A motor oil or transmission oil of a commercial SAE single- or multi-viscosity class, which contains polymeric additives and which has high dispersivity and good wear protection characteristics, said oil comprising the following additives:(i) at least one heavy-duty antioxidant or wear protective agent comprising a phosphorus containing antioxidant and antiwear compound; and (ii) an oligomeric or polymeric compound, which functions as a dispersing agent, comprised of: (a) units of alkyl(meth)acrylates of formula I â€ƒwherein R represents hydrogen or methyl, andR1 represents an alkyl group with 4-34 C atoms, said tits of formula I being present in the amount of 60-99.5 parts by weigh, based on the total weight of monomers in the oligomeric or polymeric compound, and (b) units of at least one funtionalized alkyl(meth)acrylate of formula II â€ƒwhere R1 represents hydrogen or methyl, and R2 represents an alkyl group having 2-6 C atoms and substituted with at least one OH group, or R2 represents an alkoxylated group of the formula where R3 and R4 each represent hydrogen or methyl, R5 represents an alkyl or alkyl group having 1-40 C atoms, and n is an integer ranging from 1-60 and if n&gE;2, then R5, in addition, may be hydrogen, said units of formula II being present in the amount of 0.5-40 parts by weight, being present, based on the total weight of monomers I and II in the oligomeric or polymeric compound, (c) units of one or more monomers of formula III â€ƒwhere Râ€³ represents hydrogen or methyl, and R6 represents an alkyl group with 1-5 C atoms, said units of formula III being present in the amount of 0-20 parts by weight, based on the total weight of monomers I and II in the oligomeric or polymeric compound, and (d) units of 1-alkenes of formula IV CH2=CHR7â€ƒâ€ƒ(IV) â€ƒwhere R7 represents an alkyl group having 2-40 C atoms, said units of formula IV being present in the amount of 0-50 parts by weight, based on the total weight of monomers I and II in the oligomeric or polymeric compounds; with the following provisions: (1) the units of formulas I and II together comprise 100 wt. %, (2) the content of component (ii) in the motor or transmission oil ranges from 0.5-50 wt. %, and (3) wherein phosphorus content of the motor- or transmission oil is 0.043 to 0.68 wt. %.