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US 11,365,367 B2Granted
Lubricating composition for and method of lubricating an internal combustion engine
AssigneeThe Lubrizol Corporation
InventorsPaul R. Vincent, Timothy R. Smith, Eugene Pashkovski, Reid A. Patterson
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Abstract
The invention provides a lubricating composition comprising a low viscosity base oil and a synergistic mixture of a functionalized ethylene-α-olefin copolymer, a poly(meth)acrylate polymer, and a metal-free anti-wear agent. The invention also provides a method of lubricating an internal combustion engine using such a lubricating composition.
Claims31
A lubricating composition comprising
- (a) a base oil having a kinematic viscosity (ASTM D445 test method) measured at 100° C. of 2.0 mm2/s to 5.0 mm2/s;
- (b) 0.08 weight percent to 5 weight percent of a ethylene-α-olefin copolymer, wherein the ethylene-α-olefin copolymer is grafted with a polar moiety;
- (c) 0.3 weight percent to 5 weight percent of a poly(meth)acrylate polymer, wherein the poly(meth)acrylate polymer comprises a block or tapered block copolymer (P) comprising a first block (B1) which is substantially insoluble in the base oil and consists essentially of C1 to C4 alkyl (meth)acrylate derived units and a second block (B2) which is substantially soluble in the base oil and consists essentially of C8 to C24 alkyl (meth)acrylate derived units;
- and
- (d) 0.05 weight percent to 5 weight percent of a metal-free anti-wear agent;
- wherein the dynamic viscosity measured according to ASTM D4683 of the lubricating composition under shear at 150° C. is 1.4 mPa·s to 2.8 mPa·s.
3 more elements
A lubricating composition comprising
- (a) a base oil having a kinematic viscosity measured at 100° C. of 2.0 mm2/s to 5.0 mm2/s;
- (b) 0.05 weight percent to 2 weight percent of an amine-functionalized ethylene-alpha olefin copolymer;
- (c) 0.3 weight percent to 5 weight percent of a poly(meth)acrylate polymer, wherein the poly(meth)acrylate polymer comprises a block or tapered block copolymer (P) comprising a first block (B1) which is substantially insoluble in the base oil and consists essentially of C1 to C4 alkyl (meth)acrylate derived units and a second block (B2) which is substantially soluble in the base oil and consists essentially of C8 to C24 alkyl (meth)acrylate derived units;
- and
- (d) 0.05 weight percent to 5 weight percent of a metal-free phosphorous anti-wear agent:
- wherein the dynamic viscosity measured according to ASTM D4683 of the lubricating composition under shear at 150° C. is 1.4 mPa·s to 2.8 mPa·s.
3 more elements
Dependencies are inferred from the claim text.