| 摘要 |
PROBLEM TO BE SOLVED: To provide a base oil comprising a synthetic ester composed by using a completely reclaimable material, having oxidation resistance, proper viscosity temperature behavior and the like, and also having high environmental compatibility. SOLUTION: A biologically quickly biodecomposable composition includes at least one kind of polyester or at least one kind of polyester derivative or polyester mixture and comprises a hydrocarbon selected from a group composed of lactitol, maltitol, xylitol, isomalt, 6-0-α-D-glucopyranosyl-D-sorbitol (1,6-GPS), 1-0-α-D-glucopyranosyl-D-mannitol (1,1-GPM), 1-0-α-D-glucopyranosyl-D-sorbitol (1,1-GPS), wherein the polyester is esterified by at least one kind of carboxylic acid, at least one kind of carboxylic acid derivative or their mixture. mixtures. The composition is used as a base oil for a hydraulic oil. COPYRIGHT: (C)2008,JPO&INPIT |
