Colloidal products containing calcium and / or magnesium, as well as boron and / or phosphorus and / or sulphur, their preparation and their use as additives for lubricants.

摘要

The colloidal products of the invention are obtained by a process comprising a step (a) in which is reacted with a colloidal product containing at least one alkaline - earth metal carbonate in micellar form, at least one compound chosen from among the alkylarylsulfonic and alkylsulfonic acids and their salts and the long chain aliphatic carboxylic acids and salts thereof, so as to modify a proportion ranging up to 70% of the reserve of basicity of the starting colloidal product and a step (b) in which it is neutralized, the reserve of basicity obtained by at least one acid containing at least one element selected from boron, phosphorus and sulphur. & br / these colloidal products can be used as antiwear and extreme - pressure additives in lubricants.