Grease composition

Abstract

The grease composition including: a base oil having a kinematic viscosity of 5 to 30 mm2/s at 100° C., a thickener, a polymer having a weight average molecular weight of 1,000 to 500,000, and an aliphatic amide compound. The grease composition is used for sliding between a metal member and a resin member, and capable of reducing friction between them.

1 . A grease composition comprising:
 a base oil having a kinematic viscosity of 5 to 30 mm 2 /s at 100° C.,   a thickener,   a polymer having a weight average molecular weight of 1,000 to 500,000, and   an aliphatic amide compound, wherein   the grease composition is used for sliding between a metal member and a resin member.   
     
     
         2 . The grease composition according to  claim 1 , wherein the aliphatic amide compound is a saturated aliphatic amide compound. 
     
     
         3 . The grease composition according to  claim 1 , wherein the thickener is a urea-based thickener. 
     
     
         4 . The grease composition according to  claim 3 , wherein the urea-based thickener is a diurea compound represented by the following formula (1):
   R 1 —NHCONH—R 2 —NHCONH—R 3   (1)
   wherein R 1  and R 3  represent an aliphatic hydrocarbon group having 4 to 24 carbon atoms and optionally having a substituent, an alicyclic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent, or an aromatic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent, and R 2  represents a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent.   
     
     
         5 . The grease composition according to  claim 1 , wherein the base oil comprises a poly-α-olefin. 
     
     
         6 . The grease composition according to  claim 2 , wherein the thickener is a urea-based thickener. 
     
     
         7 . The grease composition according to  claim 6 , wherein the urea-based thickener is a diurea compound represented by the following formula (1):
   R 1 —NHCONH—R 2 —NHCONH—R 3   (1)
   wherein R 1  and R 3  represent an aliphatic hydrocarbon group having 4 to 24 carbon atoms and optionally having a substituent, an alicyclic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent, or an aromatic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent, and R 2  represents a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent.   
     
     
         8 . The grease composition according to  claim 2 , wherein the base oil comprises a poly-α-olefin. 
     
     
         9 . The grease composition according to  claim 3 , wherein the base oil comprises a poly-α-olefin. 
     
     
         10 . The grease composition according to  claim 4 , wherein the base oil comprises a poly-α-olefin. 
     
     
         11 . The grease composition according to  claim 6 , wherein the base oil comprises a poly-α-olefin. 
     
     
         12 . The grease composition according to  claim 7 , wherein the base oil comprises a poly-α-olefin.