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:
Aug. 10, 1999
Filed:
Dec. 27, 1995
William B Diana, Belle Mead, NJ (US);
Joseph V Cusumano, Watchung, NJ (US);
Keith R Gorda, Little York, NJ (US);
Jacob Emert, Brooklyn, NY (US);
William B Eckstrom, Fanwood, NJ (US);
David C Dankworth, Whitehouse Station, NJ (US);
Jon E Stanat, Westfield, NJ (US);
James P Stokes, Warren, NJ (US);
Exxon Chemical Patents Inc, Linden, NJ (US);
Abstract
The invention pertains to improved lubricating oil dispersants wherein a fractionating polymer is prepared prior to functionalization (e.g., in the Koch reaction) for making dispersant additives. In one aspect, it was discovered that by fractionating a polymer to remove light hydrocarbon and unreacted monomer from the polymer before the carbonylation step of the Koch reaction, the amount of light ester impurities generated was minimized. Light ester is an undesirable byproduct that adversely affects the recycle of the catalyst from the functionalization step of the Koch reaction. The invention also pertains to improved lubricating oil nitrogen-containing dispersant additives derived from fractionated polymer.