Lubricants with sustained fuel economy performance

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 141/00 (2006.01) C10M 135/10 (2006.01) C10M 135/18 (2006.01) C10M 137/10 (2006.01) C10M 139/00 (2006.01) C10M 141/10 (2006.01) C10M 163/00 (2006.01)

Patent

CA 2195475

A lubricant composition comprising a major amount of a lubricant base oil, and a minor amount of additives comprising (A) oxymolybdenum dithiocarbamate sulphide having a specific structure, (B) zinc dialkyldithiophosphate having a specific structure, (D) an ashless dispersant, (E) a boron containing additive which may be the ashless dispersant or another additive, and (F) a metal detergent, wherein to the total weight of the composition, the molybdenum content from oxymolybdenum dithiocarbamate sulfide is at 200 to 2,000 ppm; the phosphorous content from zinc dialkyldithiophosphate is at 0.02 to 0.15 % by weight; the sulfur content from sulfur compounds is at 0.02 to 0.30 % by weight; the content of a metal detergent is at 1 to 10 % by weight; and the boron content is at 0.005 to 0.06 % by weight. The lubricant composition of the present invention has excellent low abrasion properties and can sustain good friction properties while exhibiting resistance to oxidation at higher temperatures in the presence of gaseous nitrogen oxides. The lubricant composition of the present invention is used preferably as a crankcase lubricants for internal combustion engines.

Une composition de carburant comprend une quantité prépondérante d'une huile de base pour lubrifiant et une quantité mineure d'additifs comprenant: (A) du sulfure de dithiocarbamate d'oxymolybdène à structure spécifique; (B) du dialkyldithiophosphate de zinc à structure spécifique; (D) un dispersant ne produisant pas de cendres; (E) du bore contenant un additif pouvant être ce dispersant ne produisant pas de cendres ou un autre additif; et (F) un détergent métallique. Par rapport au poids total de la composition, la teneur en molybdène due au sulfure de dithiocarbamate d'oxymolybdène varie entre 200 et 2000 ppm, la teneur en substances phosphoreuses due au dialkyldithiophosphate de zinc varie entre 0,02 et 0,15 %, la teneur en soufre due aux composés soufrés varie entre 0,02 et 0,3 %, la teneur du détergent métallique varie entre 1 et 10 %, et la teneur en bore varie entre 0,005 et 0,06 %. Cette composition de lubrifiant présente d'excellentes propriétés anti-abrasion et peut garder de bonnes propriétés anti-friction tout en offrant une résistance à l'oxydation aux hautes températures en présence d'oxydes azotés gazeux. Cette composition de lubrifiant s'utilise de préférence pour lubrifier le carter des moteurs à combustion interne.

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