Lubricating Composition Containing a Self-Assembling Polymethacrylate Block Copolymer and an Ethylene-a-Olefin Copolymer
AssigneeThe Lubrizol Corporation
InventorsReid A. Patterson, Timothy R. Smith, Paul S. O'Hora, Edward P. Sampler, Eugene Pashkovski, Kieran Trickett
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Abstract
The invention provides a lubricating composition comprising an oil of lubricating viscosity and synergistic mixture of a functionalized ethylene-α-olefin copolymer, a poly(meth)acrylate block polymer having a substantially oil soluble block and a substantially oil insoluble block. The invention also provides a method of lubricating a mechanical device using such a lubricating composition.
Claims35
A lubricating composition comprising
- (a) an oil of lubricating viscosity;
- (b) an ethylene-α-olefin copolymer, wherein the ethylene-α-olefin copolymer is grafted with a polar moiety;
- and
- (c) 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 a second block (B2) which is substantially soluble in the base oil.
The lubricating composition 1, wherein the first block (B1) comprises at least 50 mol % at least two of C1, C2, C3 or C4 (meth)acrylate derived units and the second block (B2) comprises at least 50 mol % of at least two of C12, C13, C14, C15, C16, C17, or C18 (meth)acrylate derived units.
(canceled)
Dependencies are inferred from the claim text.