Grease composition

Abstract

Grease composition for use in resin lubrication incorporating into a grease base material which includes a base oil and a fatty acid metal salt thickener at least one saturated or unsaturated fatty acid having from 8 to 22 carbon atoms and/or fatty acid metal salt, being a metal salt of a linear saturated fatty acid having from 8 to 14 carbon atoms or a metal salt of an unsaturated fatty acid having from 16 to 22 carbon atoms and from 1 to 4 unsaturated groups, the metal having a valence of from 1 to 4 excluding fatty acid metal salts used for the thickener. The grease composition of the present invention gives satisfactory lubrication properties between resin and resin or resin and other material such as a metal.

1 . A grease composition for use in resin lubrication, wherein the grease composition comprises: a grease base material, which includes a base oil and a fatty acid metal salt thickener, and an additive of at least one saturated or unsaturated fatty acid having from 8 to 22 carbon atoms and/or fatty acid metal salt, being a metal salt of a linear saturated fatty acid having from 8 to 14 carbon atoms or a metal salt of an unsaturated fatty acid having from 16 to 22 carbon atoms and from 1 to 4 unsaturated groups, the metal having a valence of from 1 to 4 excluding fatty acid metal salts used for the thickener. 
     
     
         2 . The grease composition for use in resin lubrication according to  claim 1 , wherein the metal of the aforementioned fatty acid metal salt is lithium, sodium, potassium, magnesium, calcium, zinc, aluminium or lead. 
     
     
         3 . The grease composition for use in resin lubrication according to  claim 1 , wherein the total content of the one or more saturated or unsaturated fatty acid and/or fatty acid metal salt is in the range of from 0.1 to 10% by mass relative to the total amount of the grease composition. 
     
     
         4 . The grease composition for use in resin lubrication according to  claim 1 , wherein at least one of a urea, bentonite, calcium phosphate or sodium terephthalamate is incorporated as a thickener together with the aforementioned fatty acid metal salt thickener.