Motor oil with high dispersivity and good wear protection characteristics
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United States of America Patent
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Nov 5, 2002
Grant Date -
N/A
app pub date -
Aug 2, 1995
filing date -
Aug 3, 1994
priority date (Note) -
Expired
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Abstract
Motor oils and transmission oils of the usual commercial SAE single- and multiple viscosity classes, which oils contain polymeric additives and which have high dispersivity and good wear protection characteristics, said oils containing the following additives: (i) at least one heavy-duty (HD) additive, which contains phosphorus compounds; and (ii) as dispersive polymeric components PC, cooligomers copolymers, or combinations thereof comprised of: (a) units of C.sub.6-24 alkyl (meth)acrylates, (b) units of at least one functionalized alkyl (meth)acrylate, (c) units of one or more C.sub.1-5 -alkyl (meth)acrylate monomers, and (d) units of 1-alkenes, with the following provisions: (1) the units of formulas I and II together comprise 100 wt. %, (2) the content of polymer components) PC in the additive-containing mineral oils is in the range 0.5-50 wt. %, and (3) the content of phosphorus in the additive-containing mineral oils is less than or equal to 0.08 wt. %.
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