GREASE BASE OIL AND GREASE COMPOSITION CONTAINING SAID GREASE BASE OIL

摘要

A grease base oil, containing: condensation esters of alcohols (A) and carboxylic acids (B), wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1), the carboxylic acids (B) include a fatty acid having 5 or more and 9 or less carbon atoms (B-1), a branched fatty acid having 15 or more and 20 or less carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 or more and 8 or less carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and the carboxylic acids (B) have a percentage of (B-1) above of 30 mol% or more and 50 mol% or less, a percentage of (B-2) above of 30 mol% or more and 50 mol% or less, a percentage of (B-3) above of 10 mol% or more and 30 mol% or less, and a percentage of (B-4) above of 1 mol% or more and 15 mol% or less. The grease base oil contains condensation esters having heat resistance and low temperature storageability.