High performance renewable chainsaw bar lubricants

Abstract

A biodegradable chain bar lubricant composition containing a blend of naturally occurring and partially hydrogenated vegetable oil triglycerides, which blend it can be adjusted for the lubricant composition an unusually low pour point to make it useful for cold weather applications, or a high lubricity at higher summer temperatures. The composition also contains additives including a viscosity modifying additive, a pour point depressant, a tackifier, a lubricity improver, and an anti-wear or anti-corrosion additive.

1 . A biodegradable chain saw bar lubricant composition comprising:
 (a) a blend of between one and ninety nine percent of one or more naturally occurring triglycerides and between ninety nine and one percent of one or more partially hydrogenated triglycerides, said naturally occurring triglycerides having an oleic content of at least 60% and said partially hydrogenated triglycerides having an oleic content of less than 50%;   (b) between 2 and 10% of a viscosity modifying additive;   (c) between 3 and 10% of a tackifier;   (d) between 2 and 3% of a pour point depressant; and   (e) between 1.5 and 5.0% of an anti-wear agent.   
     
     
         2 . The biodegradable chain saw bar lubricant composition of  claim 1  wherein the blend of triglycerides comprises between 76% and 84% of said lubricant composition. 
     
     
         3 . The biodegradable chain saw bar lubricant composition of  claim 1  wherein the blend of triglycerides is comprised primarily of naturally occurring triglycerides and has an oleic content of at least 60% and said lubricant composition has a pour point of lower than minus 30° C. 
     
     
         4 . The biodegradable chain saw bar lubricant composition of  claim 1  wherein the blend of triglycerides has a ratio of mono to poly unsaturated content of between 0.5/1.0 to 0.98/1 and the lubricant composition causes less than one half the wear during back-to-back block on ring tribometer tests when compared to a petroleum based chain saw lubricant having similar viscometric properties and containing the same additive package. 
     
     
         5 . The biodegradable chain saw bar lubricant composition of  claim 1  wherein the triglycerides are from RBD soy and have an oleic content of approximately 35%, a linoleic content of approximately 43%, a linolenic content of approximately 3%, a palmitic acid content of approximately 10% and the lubricant composition causes less than one half the wear during back-to-back block on ring tribometer tests when compared to a petroleum based chain saw lubricant having similar viscometric properties and containing the same additive package. 
     
     
         6 . The biodegradable chain saw bar lubricant composition of  claim 3  having a pour point of lower than minus 35° C., in which the triglycerides have an oleic content of greater than 60% and the stearic acid content of less than 5%. 
     
     
         7 . The biodegradable chain saw bar lubricant composition of  claim 6  The biodegradable chain saw bar lubricant composition of  claim 3  in which the triglycerides comprise esters having at least one straight chain fatty acid moiety and a glycerol moiety wherein the fatty acid moiety contains R.sup.1, R.sup.2 and R.sup.3 which are saturated or unsaturated aliphatic hydrocarbon groups containing from about 8 to about 22 carbon atoms, preferably from about 12 to 22 carbon atoms. 
     
     
         8 . A BioLubricant composition comprising a blend of triglycerides having a ratio of mono to poly unsaturated content of between 0.5/1.0 to 0.98/1.0 in which said blend of triglycerides is formed by the partial hydrogenation of a vegetable oil, and said composition contains between 2 and 10% of a viscosity modifying additive, between 3 and 10% of a tackifier, between 2 and 3% of a pour point depressant, and between 1.5 and 5.0% of an anti-wear agent. 
     
     
         9 . The Bio lubricant composition of  claim 8  in which the viscosity modifying additive includes a nitrogen-containing ester of a carboxyl-containing interpolymer, said interpolymer having a specific viscosity of from about 0.05 to about 2, said ester being substantially free of titratable acidity and being characterized by the presence within its polymeric structure of at least one of each of three pendant polar groups: (A) a relatively high molecular weight carboxylic ester group having at least 8 aliphatic carbon atoms in the ester radical, (B) a relatively low molecular weight carboxylic ester group having no more than 7 aliphatic carbon atoms in the ester radical, and (C) a carbonyl-polyamino group derived from a polyamino compound having one primary or secondary amino group, wherein the molar ratio of (A):(B):(C) is (60-90):(10-30):(2-15), respectively.