US 12,460,150 B1
Low-ash lubricating compositions
Mariah Parker, Richmond, VA (US); and Kenneth Garelick, Mechanicsville, VA (US)
Assigned to AFTON CHEMICAL CORPORATION
Filed by AFTON CHEMICAL CORPORATION, Richmond, VA (US)
Filed on Sep. 27, 2024, as Appl. No. 18/899,803.
Int. Cl. C10M 169/04 (2006.01); C10M 141/10 (2006.01); C10N 20/04 (2006.01); C10N 30/00 (2006.01); C10N 30/04 (2006.01); C10N 30/06 (2006.01); C10N 30/12 (2006.01); C10N 40/25 (2006.01)
CPC C10M 169/04 (2013.01) [C10M 141/10 (2013.01); C10M 2219/046 (2013.01); C10M 2223/045 (2013.01); C10M 2223/047 (2013.01); C10N 2020/04 (2013.01); C10N 2030/04 (2013.01); C10N 2030/06 (2013.01); C10N 2030/12 (2013.01); C10N 2030/24 (2020.05); C10N 2030/45 (2020.05); C10N 2030/52 (2020.05); C10N 2040/25 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A passenger car lubricating composition having a low sulfated ash content, the passenger car lubricating composition comprising:
one or more base oils of lubricating viscosity;
an antiwear system including one or more ashless phosphorus-containing antiwear compounds and, optionally, one or more metal-containing antiwear compounds, and wherein a phosphorus weight ratio of phosphorus from the one or more ashless antiwear compounds to phosphorus from the one or more optional metal-containing antiwear compounds is about 50:50 to about 100:0, wherein the ashless phosphorus-containing antiwear additive is a triester of a dithiophosphate having two oxygen ester moieties and a sulfur ester moiety, wherein the ashless phosphorus-containing antiwear additive has a molecular weight of at least about 490 g/mol, and wherein each oxygen ester is derived from 4-methyl-2-pentyl alcohol and the sulfur ester is derived from dibutyl maleate;
a sulfated ash content of about 0.75 weight percent or less as measured pursuant to ASTM D874;
about 700 ppm or less of total phosphorus contributed by the one or more ashless phosphorus-containing antiwear compounds and the optional one or more metal-containing antiwear compounds;
a detergent system having a weight ratio of magnesium-to-calcium of about 2.0 or less; and
a TBN ratio of TBN measured per ASTM D4739 relative to TBN measured per ASTM D2896 of at least about 60 percent.