| abstract |
The invention relates to lubricant compositions containing phosphonic acids of hydroxyalkane as well as derivatives thereof. More specifically, the invention relates to phosphonic acids of hydroxyalkane which can be reacted to form salts, with basic materials, including overbased detergents, dispersants and amines. These materials are particularly useful in lubricating compositions. Hydroxyalkane phosphonic acid is represented by formula (I), in which X represents oxygen, sulfur or a secondary amino group, n represents an integer between 1 and 8, Y represents hydrogen or a group of phosphonic acids , and R represents an alkyl group containing 1 to about 100 carbon atoms. |