To obtain a lubricating oil for metal rolling containing a specific aliphatic cyclic polycarboxylic acid ester, excellent in stability to hydrolysis, giving scarce effect on metal especially suitable for using as an emulsion with water.
The lubricating oil contains, preferably, at least 10wt.% of the aliphatic cyclic polycarboxylic acid esters expressed in the formula (A is cyclohexane ring, cyclohexene ring; R1 is H or methyl; X is H, COOR4; Y is H, COOR5; R2-R5 are each a 3-18C branched alkyl, a 3-10C cycloaklyl, a 1-18C linear chain alkyl, etc.). The preferable acid components composing the ester are 1,2-cyclohexanedicarboxylic acid, 4-cyclohexene-1,2-dicarboxylic acid, etc. The preferable alcohol composing the ester is diisobutanol, cyclohexanol, etc. The concomitant use of branched alkyl ester and/or cycloalkylester is preferred when using a linear chain alkyl ester as the ester of the formula.
| WO/2000/022071 | POLAR OIL BASED INDUSTRIAL OILS WITH ENHANCED SLUDGE PERFORMANCE |
| JP5225343 | Lubricating oil composition |
SAITOU MIKIO
TOKASHIKI MICHIHIDE
