Patent ID: 9410104
Filing Date: 2016-08-09
CPC Classification: C10M,C10N

Claim Text:
1. A lubricating composition comprising: (a) about 0.1 wt % to about 25 wt % of a polymer derived from greater than 50 wt % of more of a non-diene monomer, wherein the polymer has radial or star architecture; (b) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt, or ester, wherein the phosphorus-containing acid, salt, or ester comprises an amine salt of a phosphorus acid or ester; (c) about 0.1 wt % to about 8 wt % of an extreme pressure agent, wherein the extreme pressure agent, other than a phosphorus-containing acid, salt, or ester comprises a boron-containing compound, wherein the boron compound comprises a borate ester, a borate alcohol, a borated dispersant or mixtures thereof; and (d) an oil of lubricating viscosity, wherein the polymer is obtained from a RAFT or ATRP polymerisation process, wherein the polymer is a polymethacrylate having 7 or more arms, and wherein, the polymethacrylate is derived from a monomer composition comprising (a) about 50 wt % to about 95 wt % of an alkyl methacrylate comprising a mixture of alkyl methacrylates having 12 to 15 carbon atoms; (b) about 5 wt % to about 40 wt % of an alkyl methacrylate, wherein the alkyl group of the methacrylate has about 1 to about 9 carbon atoms; and (c) about 0 wt % to about 10 wt % of a nitrogen containing monomer, wherein the polymethacrylate has a polymeric arm architecture that is random.