The Lubrizol Corporation

John W Dunkerley

Ewan E Delbridge

James D Burrington

John J Mullay

Jonathan R Sharpe

Mohamed G Fahmy

Willis P Nichols

David M Hobson

Claire L Hollingshurst

Elisa J Seddon

Alexander F Psaila

Brian R Cunningham

Jonathan S Sharpe

The present invention relates to functional fluid compositions containing friction modifiers, and specifically stable compositions containing friction modifiers with limited solubility in and/or limited compatibility with the functional fluids with which they are used. In particular the present invention deals with functional fluids used in internal combustion engines, such as engine oils, and friction modifiers derived from hydroxy-carboxylic acids, where the friction modifier is present in the functional fluid composition at levels that would otherwise cause the composition to be unstable and/or hazy.

Stabilized blends containing friction modifiers

The invention provides a process for preparing a neutral or an overbased detergent, the process by: reacting (a) a pre-prepared suspension comprising (i) a metal base with a mean particle size of 10 micrometers or less; (ii) a surfactant; and (iii) an organic medium in which the metal base is suspended typically by a physical process. An overbased detergent may be formed with a further reaction with acidifying overbasing agent. The invention further provides a lubricant composition containing said neutral and overbased detergent.

Method of preparing an overbased or neutral detergent

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Belper, United Kingdom

John W Dunkerley