Improved low-precipitation method for the preparation of borated dispersant

摘要

Low precipitation method for the preparation of ester-containing lubricating oil additives, or - (57) oil-soluble polymer-substituted nitrogen is [Abstract] borated. Boron reaction conditions, the polymer-substituted nitrogen in the reaction zone - the ester-containing additive, or is contacted with a particulate boric acid in the presence of a solvent therefor. The boric acid has a particle size distribution in lubricating oil characterized in the following about 450 Φ value. Ratio divided by the total outside surface area of ​​spherical particles of the total volume of the spherical particles, Φ values, that is, [Wherein, for each of the distribution segments defining a particle size range, d _i is the average particle diameter of the distribution segment of the i-th sum all N _i, and is the particle volume percent of the distribution segment of the i-th It is] taken over the segment.