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. 14, 2015
Filed:
Jun. 23, 2005
Markus Scherer, Cologne, DE;
Klaus Hedrich, Fischbachtal, DE;
Alexander Dardin, Laudenbach, DE;
Michael Mueller, Bensheim, DE;
Torsten Stoehr, Frankfurt, DE;
Boris Eisenberg, Heppenheim, DE;
Markus Scherer, Cologne, DE;
Klaus Hedrich, Fischbachtal, DE;
Alexander Dardin, Laudenbach, DE;
Michael Mueller, Bensheim, DE;
Torsten Stoehr, Frankfurt, DE;
Boris Eisenberg, Heppenheim, DE;
EVONIK ROHMAX ADDITIVES GmbH, Darmstadt, DE;
Abstract
The invention relates to the use of graft polymers obtained by polymerization in two stages. In a first stage, at least one graft basis is produced by radically polymerizing a monomer composition A) containing 0 to 40 percent by weight of one or several ethylenically unsaturated ester compounds of formula (I), wherein R represents hydrogen or methyl, Rrepresents a linear or branched alkyl radical comprising 1 to 5 carbon atoms, Rand Rindependently represent hydrogen or a group of formula —COOR', wherein R′ represents hydrogen or an alkyl group comprising 1 to 5 carbon atoms, 60 to 100 percent by weight of one or several ethylenically unsaturated ester compounds of formula (II), wherein R represents hydrogen or methyl, Rrepresents a linear or branched alkyl radical comprising 6 to 40 carbon atoms, Rand Rindependently represent hydrogen or a group of formula —COOR′, wherein R′ represents hydrogen or an alkyl group comprising 6 to 40 carbon atoms, and 0 to 40 percent by weight of comonomers, the percentages being relative to the weight of monomer composition A). In a second stage, a monomer composition B) containing 20 to 100 percent by weight of at least one monomer that comprises at least one nitrogen-containing group is grafted onto the graft basis in order to reduce wear in lubricant oil compositions. Said graft polymer comprises a maximum of 200 ppm of sulfur while the weight ratio between monomer composition A) and monomer composition B) ranges between 99.7:0.3 and 80:20.