Patent ID: 8470749
Filing Date: 2013-06-25
Classification: C10M,C10N

Abstract:
1. A process for preparing an overbased detergent, the process comprising: reacting (a) a pre-prepared suspension comprising (i) a calcium or magnesium metal base with a mean particle size of about 1 micrometers or less, (ii) a surfactant comprising an ionic or non-ionic compound with a hydrophilic lipophilic balance of about 1 to about 18, and (iii) an organic medium comprising an oil of lubricating viscosity, a liquid fuel, a hydrocarbon solvent, or mixtures thereof, in which the metal base is suspended; wherein the metal base is suspended uniformly in the organic medium by a physical process and wherein the physical process results in the metal base having a mean particle size of less than about 1 micrometer; (b) an acidifying overbasing agent; and (c) an acidic or neutralised detergent substrate, to form an overbased detergent, wherein the physical process comprises milling, and wherein the amount of metal base present in the suspension ranges from about 40 wt % to about 65 wt % of the suspension.