Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic sulfur compound – wherein the sulfur is single bonded...
Patent
1998-07-15
2000-08-22
Johnson, Jerry D.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic sulfur compound, wherein the sulfur is single bonded...
508460, 508586, C10M15924
Patent
active
061072591
ABSTRACT:
An engine oil contains a lubricating oil and an overbased calcium sulfonate having a dispersion of calcite-core micelles, which engine oil has commercial haze free properties, namely a Hazitron test value of less than about 30 and more particularly less than about 15 to 10, and commercial anti-wear properties, namely exhibiting a 4-Ball wear test scar diameter of less than 0.4 mm. The detergent has a TBN of from 100 to 400 and yet a viscosity of no more than 100,000 cps at 25.degree. C. and usually 20,000 to 30,000 cps at 25.degree. C. The overbased calcium sulfonate detergent provides a stable dispersion of calcite-core sulfonate micelles in the oil. The calcite overbased sulfonate is substantially free of amorphous, vaterite and aragonite forms of the calcium carbonate. The method of producing the improved calcite-core dispersion overbased calcium sulfonate provides for reacting an overbased amorphous calcium sulfonate having a TBN of about 400 or more with a C.sub.1 to C.sub.6 carboxylic acid or salt, such as acetic acid or calcium acetate, a C.sub.1 to C.sub.5 alkanol such as, methanol, and water, in a hydrocarbon solvent or oil, at closely controlled temperatures up to and to commensurate with the boiling point of the hydrocarbon solvent for usually about up to 11/2 hours to convert the amorphous calcium carbonate to a stable dispersion of a calcite-core micellar structure.
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Eliades Theo I.
Mackwood Wayne A.
Muir Ronald J.
Niece Ken
Johnson Jerry D.
Witco Corporation
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