Inventors:
John V. Redpath - North Brunswick NJ
Ronald P. Wangner - Garden City NY
Steven P. Winston - Yorba Linda CA
Assignee:
Exxon Chemical Patents Inc. - Linden NJ
International Classification:
C08F25510
C08F 832
Abstract:
A low sediment process for forming a borated, oil soluble, polymer-substituted, nitrogen- or ester-containing lubricating oil additive. A polymer-substituted, nitrogen- or ester-containing additive in the presence of a solvent therefor, is contacted under boronating reaction conditions in a reaction zone with particulate boric acid. The boric acid has a particle size distribution in lubricating oil characterized by a. phi. value of not greater than about 450. The. phi. value is the ratio of said particles' total spherical volume divided by said particles' total spherical external surface area; i. e. , ##EQU1## wherein, for each of a plurality of distribution segments defining a particle size range; d. sub. i is the average particle diameter for the ith distribution segment; N. sub. i is the particle volume percent of the ith distribution segment; and the sum is taken over all the distribution segments.