Lubricating composition for a marine engine

Abstract

The present invention relates to a lubricant composition for a marine engine, in particular for a four-stroke or two-stroke marine engine, comprising at least one base oil, at least one alkoxylated fatty amine, at least one hydrogenated styrene-isoprene copolymer and at least one detergent.

1 .- 20 . (canceled) 
     
     
         21 . Lubricant composition for a 4-stroke or 2-stroke marine engine, comprising:
 a) at least one base oil,   b) at least one alkoxylated fatty amine,   c) at least one hydrogenated styrene-isoprene copolymer,   d) at least one detergent.   
     
     
         22 . Lubricant composition according to  claim 21  in which the alkoxylated fatty amine is obtained from fatty acids comprising from 10 to 24 carbon atoms. 
     
     
         23 . Lubricant composition according to  claim 21  comprising at least one alkoxylated fatty amine of formula (I) 
       
         
           
           
               
               
           
         
       
       in which:
 R 3  represents an alkane-di-yl group comprising from 2 to 10 carbon atoms; 
 R 4  represents a linear or branched, saturated or unsaturated, alkyl group comprising from 12 to 22 carbon atoms; 
 R 5  represents an alkane-di-yl group comprising from 1 to 10 carbon atoms; 
 m represents an integer ranging from 0 to 12; 
 n represents an integer ranging from 0 to 12; 
 p represents an integer ranging from 0 to 12; 
 q represents 0 or 1; 
 the sum m+n+p is strictly greater than 0. 
 
     
     
         24 . Lubricant composition according to  claim 23  in which:
 R 3  represents an alkane-di-yl group comprising from 2 to 4 carbon atoms; 
 R 4  represents a linear or branched, saturated or unsaturated, alkyl group comprising from 16 to 20 carbon atoms; 
 R 5  represents an alkane-di-yl group comprising from 2 to 4 carbon atoms; 
 m represents 0, 1, 2, 3, 4 or 5; 
 n represents 0, 1, 2, 3, 4 or 5; 
 p represents 0, 1, 2, 3, 4 or 5; 
 q represents 0 or 1; 
 the sum m+n+p represents an integer ranging from 1 to 15. 
 
     
     
         25 . Lubricant composition according to  claim 21  comprising at least one alkoxylated fatty amine of formula (Ia): 
       
         
           
           
               
               
           
         
       
       in which:
 R 3  represents an alkane-di-yl group comprising from 2 to 4 carbon atoms; 
 R 4  represents a linear or branched, saturated or unsaturated, alkyl group comprising from 16 to 20 carbon atoms; 
 m represents 0, 1 or 2; 
 n represents 0, 1 or 2; 
 the sum m+n represents an integer ranging from 1 to 4. 
 
     
     
         26 . Lubricant composition according to  claim 21  in which the hydrogenated styrene-isoprene copolymer has a content of hydrogenated isoprene units ranging from 50% to 98% with respect to the mass of hydrogenated styrene-isoprene copolymer. 
     
     
         27 . Lubricant composition according to  claim 21  in which the hydrogenated styrene-isoprene copolymer has a content of styrene units ranging from 2% to 50% with respect to the mass of hydrogenated styrene-isoprene copolymer. 
     
     
         28 . Lubricant composition according to  claim 21  in which the detergent is chosen from the alkali or alkaline-earth metal salicylates or phenates, alone or in a mixture. 
     
     
         29 . Lubricant composition according to  claim 28  in which the detergent is chosen from calcium salicylates or calcium phenates, alone or in a mixture. 
     
     
         30 . Lubricant composition according to  claim 21  also comprising a dispersant. 
     
     
         31 . Lubricant composition according to  claim 30  in which the dispersant is chosen from the compounds comprising at least one succinimide group. 
     
     
         32 . Lubricant composition according to  claim 30  in which the dispersant is chosen from the borated compounds comprising at least one succinimide group. 
     
     
         33 . Lubricant composition according to  claim 21  in which the base oil is chosen from the base oils of Group I or Group II, alone or in a mixture. 
     
     
         34 . Lubricant composition according to  claim 21 , also comprising at least one additional additive chosen from anti-wear additives, antioxidants, additional polymers improving the viscosity index, pour point improvers, anti-foaming agents, thickeners and mixtures thereof. 
     
     
         35 . Lubricant composition according to  claim 21  having a BN determined according to the ASTM D-2896 standard, from 5 to 100 mg of KOH/g of lubricant composition. 
     
     
         36 . Lubricant composition according to  claim 21  having a kinematic viscosity measured according to the ASTM D7279 standard at 100° C. comprised between 5.6 and 26.1 cSt. 
     
     
         37 . Lubricant composition according to  claim 21  having a BN determined according to the ASTM D-2896 standard, from 7 to 80 mg of KOH/g of lubricant composition. 
     
     
         38 . Lubricant composition according to  claim 21  having a kinematic viscosity measured according to the ASTM D7279 standard at 100° C. comprised between 9.3 and 21.9 cSt. 
     
     
         39 . Method for reducing the fuel consumption of 4-stroke or 2-stroke marine engines, comprising adding a lubricant composition according to  claim 21  into the marine engines. 
     
     
         40 . Method for improving the engine cleanliness of 4-stroke or 2-stroke marine engines, comprising adding at least one alkoxylated fatty amine in a lubricant composition for 2-stroke or 4-stroke marine engines comprising at least one base oil, at least one hydrogenated styrene-isoprene copolymer and at least one detergent.