| abstract |
Calcium overbased soap comprising calcium carbonate dispersed in the calcium salt of a carboxylic acid, the said acids consisting of a mixture or otherwise of saturated organic carboxylic acids containing from 7 to 13 carbon atoms, having the following characteristics: a linear acid content of between 0 and 40 % by weight, a content of acids which are branched on carbon 2 of between 0 and 20 % by weight, and, a content of acids which are mono- or poly-substituted on carbon 3 and/or on the carbons of higher rank which is equal to or greater than 50 % by weight. These are used as antiwear additives in lubricants, particularly metal working and drilling muds and have good stability in oil/water systems. |