Gregory Ryan Conary

53286197, Jul 12, 1994

Jun 21, 1991

7/718788

Gregory S. Conary - Columbia IL

Ethyl Petroleum Additives, Inc. - St. Louis MO

C10M13900
C10M13300

252 325

Haze formation in additive concentrates containing boron-containing ashless dispersants is inhibited, and improvements in performance capabilities can be realized, by suitably controlling the pH of the concentrate as produced. Not only does such pH control result in no sacrifice in wear and corrosion inhibition, but it has been found possible by suitable adjustment and control of pH to actually improve the effectiveness of the concentrate in its ability to inhibit wear and corrosion. Moreover, such pH control makes possible the provision of compositions having enhanced extreme pressure properties as seen in the standard L-42 test, and improved antirust performance as seen in the standard L-33 test.

60966912, Aug 1, 2000

Apr 9, 1993

8/045675

Gregory S. Conary - Columbia IL
Rolfe J. Hartley - St. Louis MO

Ethyl Corporation - Richmond VA

C10M14110

508189

The concentrates comprise specified proportions of diluent oil, an organic sulfur-containing antiwear and/or extreme pressure agent, an ashless dispersant, a dimethyl ester of an aliphatic phosphonic acid in which the aliphatic group has an average in the range of about 12 to about 24 carbon atoms, and a 3-hydrocarbyl-2,5-diketopyrrolidine in which the hydrocarbyl group is an alkyl or alkenyl group having an average in the range of about 12 to about 30 carbon atoms. By using weight ratios of diketopyrrolidine to the dimethyl phosphonate of at least 3:1, the concentrate remains homogeneous at temperatures at least as low as 12. degree. C. When utilized as a top treat in gear oils formulated with conventional GL-4 and GL-5 gear additive packages substantial improvements in limited slip axle performance can be realized.