Lubricant composition

Abstract

A lubricant composition which is capable of reducing friction, while ensuring anti-wear properties even if the viscosity thereof is decreased. A lubricant composition which contains a lubricant base oil, (A1) a metal salicylate and (B) a molybdenum-based friction regulator, and which is characterized in that: the amount of the component (B) is 500 to 1,500 ppm by mass in terms of the molybdenum concentration [B] in the lubricant composition; the component (A1) is calcium salicylate, magnesium salicylate or a combination thereof; the calcium concentration [Ca] based on the calcium salicylate in the lubricant composition is 0 to 1,800 ppm by mass; the magnesium concentration [Mg] based on the magnesium salicylate in the lubricant composition is 0 to 1,800 ppm by mass; and the total of the calcium concentration [Ca] and the magnesium concentration [Mg] is 200 to 3,000 ppm by mass.

1 . A lubricant composition comprising:
 a lubricant base oil;   (A1) a metal salicylate; and   (B) a molybdenum-based friction modifier,   wherein   the amount of component (B) is in a range of 500 to 1,500 ppm by weight in terms of a concentration [B] in ppm by weight of molybdenum in the lubricant composition,   component (A1) is any one of calcium salicylate, magnesium salicylate, and a combination thereof,   the amount of calcium salicylate is 0 to 1,800 ppm by weight in terms of a concentration [Ca] in ppm by weight of calcium derived from calcium salicylate in the lubricant composition,   the amount of magnesium salicylate is 0 to 1,800 ppm by weight in terms of a concentration [Mg] in ppm by weight of magnesium derived from magnesium salicylate in the lubricant composition, and   a total of [Ca] and [Mg] is in a range of 200 to 3,000 ppm by weight.   
     
     
         2 . The lubricant composition according to  claim 1 , which further comprises a metallic detergent other than component (A1) as a metallic detergent (A),
 wherein the weight of component (A1) based on the total weight of the metallic detergent (A) is in a range of 5 to 100% by weight in terms of a ratio of [Ca] and [Mg] based on a total concentration [A] in ppm by weight of metals derived from the metallic detergent in the lubricant composition.   
     
     
         3 . The lubricant composition according to  claim 1 , wherein the metal salicylate (A1) is a combination of magnesium salicylate and calcium salicylate. 
     
     
         4 . The lubricant composition according to  claim 1 , wherein the metal salicylate (A1) is at least one kind of magnesium salicylate. 
     
     
         5 . The lubricant composition according to  claim 1 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         6 . The lubricant composition according to  claim 1 , wherein the amount of the metal salicylate (A1) satisfies following equation (2):
   [ A 1]/[ B ]<4.5  (2)
   wherein [A1] represents a total concentration ([Ca]+[Mg]) in ppm by weight of magnesium and calcium that are derived from component (A1) in the lubricant composition.   
     
     
         7 . The lubricant composition according to  claim 1 , which has a CCS viscosity at −35° C. of 6.2 Pa·s or less. 
     
     
         8 . The lubricant composition according to  claim 1 , which has a high-temperature high-shear viscosity (HTHS viscosity) at 150° C. of 1.7 to 2.9 mPa·s. 
     
     
         9 . The lubricant composition according to  claim 1 , which has a kinematic viscosity at 100° C. of less than 9.3 mm 2 /s. 
     
     
         10 . The lubricant composition according to  claim 1 , which is for an internal combustion engine. 
     
     
         11 . The lubricant composition according to  claim 1 , wherein the metal salicylate (A1) is a combination of magnesium salicylate and calcium salicylate. 
     
     
         12 . The lubricant composition according to  claim 1 , wherein the metal salicylate (A1) is at least one kind of magnesium salicylate. 
     
     
         13 . The lubricant composition according to  claim 2 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         14 . The lubricant composition according to  claim 3 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         15 . The lubricant composition according to  claim 4 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         16 . The lubricant composition according to  claim 11 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         17 . The lubricant composition according to  claim 12 , wherein
 the lubricant composition further comprises (A2) a metallic detergent other than component (A1) as the metallic detergent (A),   component (A2) comprises at least one selected from magnesium, calcium and sodium, and   the amount of the metallic detergent (A) satisfies following equation (1):
   [ A ]/[ B ]≤4.5  (1)
 
   wherein [A] represents a total concentration in ppm by weight of magnesium, calcium and sodium in the lubricant composition.   
     
     
         18 . The lubricant composition according to  claim 2 , wherein the amount of the metal salicylate (A1) satisfies following equation (2):
   [ A 1]/[ B ]<4.5  (2)
   wherein [A1] represents a total concentration ([Ca]+[Mg]) in ppm by weight of magnesium and calcium that are derived from component (A1) in the lubricant composition.   
     
     
         19 . The lubricant composition according to  claim 3 , wherein the amount of the metal salicylate (A1) satisfies following equation (2):
   [ A 1]/[ B ]<4.5  (2)
   wherein [A1] represents a total concentration ([Ca]+[Mg]) in ppm by weight of magnesium and calcium that are derived from component (A1) in the lubricant composition.   
     
     
         20 . The lubricant composition according to  claim 4 , wherein the amount of the metal salicylate (A1) satisfies following equation (2):
   [ A 1]/[ B ]<4.5  (2)
   wherein [A1] represents a total concentration ([Ca]+[Mg]) in ppm by weight of magnesium and calcium that are derived from component (A1) in the lubricant composition.