US 11,958,875 B1
Thiophosphoric acid products for antiwear additives
Brandon Knouse, Moseley, VA (US); David Edwards, Richmond, VA (US); Magdalena Makowska, Mechanicsville, VA (US); and Gregory James, Glen Allen, VA (US)
Assigned to Afton Chemical Corporation, Richmond, VA (US)
Filed by Afton Chemical Corporation, Richmond, VA (US)
Filed on Mar. 31, 2023, as Appl. No. 18/193,875.
This patent is subject to a terminal disclaimer.
Int. Cl. C07F 9/165 (2006.01); C10M 137/10 (2006.01)
CPC C07F 9/165 (2013.01) [C10M 137/105 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A thiophosphoric acid product comprising at least a compound having the structure of Formula I

OG Complex Work Unit Chemistry
wherein
R1 is sulfur or oxygen;
R2 and R3 are, independently, one of —OR4 or —OH, and each R4 if included is, independently, a C3 to C18 linear or branched alkyl group, a C5 to C6 cycloalkyl group, a phenyl group, or a C6 to C18 alkylphenol group; and
wherein the thiophosphoric acid product has about 0.1 mmoles/gram or less of active sulfur as measured via titration with triphenyl phosphine.