The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1995
Filed:
Nov. 22, 1993
John V Redpath, North Brunswick, NJ (US);
Ronald P Wangner, Garden City, NY (US);
Steven P Winston, Yorba Linda, CA (US);
Exxon Chemical Patents Inc., Linden, NJ (US);
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.