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. 07, 2007
Filed:
Jan. 31, 2005
Cathy C. Devlin, Richmond, VA (US);
Charles A. Passut, Midlothian, VA (US);
Joe S. Bradley, Midlothian, VA (US);
Michael A. Danylo, Midlothian, VA (US);
Yoon Song, Richmond, VA (US);
Sanjay Srinivasan, Midlothian, VA (US);
Zhaoyao Joe Qiu, Baton Rouge, LA (US);
Errol Joseph Olivier, Baton Rouge, LA (US);
Patric Meessen, La Calamine, BE;
Gerhard Van Vliet, Maastricht, NL;
Gerardus Arnoldus Rademakers, Heerlen, NL;
Johannes Hendrik Geesink, Schinnen, NL;
Cathy C. Devlin, Richmond, VA (US);
Charles A. Passut, Midlothian, VA (US);
Joe S. Bradley, Midlothian, VA (US);
Michael A. Danylo, Midlothian, VA (US);
Yoon Song, Richmond, VA (US);
Sanjay Srinivasan, Midlothian, VA (US);
Zhaoyao Joe Qiu, Baton Rouge, LA (US);
Errol Joseph Olivier, Baton Rouge, LA (US);
Patric Meessen, La Calamine, BE;
Gerhard Van Vliet, Maastricht, NL;
Gerardus Arnoldus Rademakers, Heerlen, NL;
Johannes Hendrik Geesink, Schinnen, NL;
Afton Chemical Corporation, Richmond, VA (US);
Abstract
A novel highly grafted, multi-functional olefin copolymer is provided comprising an additive reaction product of a method comprising reacting acylating agent with an olefin copolymer having a number average molecular weight greater than about 1,000 in the presence of a free radical initiator and essentially free of hydrocarbon solvent in an extruder to provide an olefin copolymer intermediate comprising an acylated olefin copolymer having a degree of grafting (DOG) of at least 0.5 wt. %, which copolymer intermediate's molecular weight is reduced, vacuum stripped of unreacted components, pelletized, dissolved in a neutral oil (preferably with inert gas sparging), and further reacted with a polyamine to provide a grafted multi-functional olefin copolymer viscosity modifier, and lubricating oil concentrates and compositions containing the same and uses thereof.