| abstract |
Provided is a lubricating oil excellent in biodegradability, which contains a polyester compound excellent in biodegradability. As a polyester compound, a compound represented by the following general formula (I) is used in a lubricating oil. [Chemical 1] In the formula (I), R 1 represents a remaining group obtained by removing a hydroxyl group from a monohydroxy or polyhydroxy compound having 1 to 8 hydroxyl groups in one molecule. x represents an integer of 1 to 8. R 2 independently represents an alkylene group having 2 to 12 carbon atoms, and R 3 independently represents an alkylene group having 2 to 4 carbon atoms. m independently represents an integer of 1 to 500, and n independently represents an integer of 3 to 1000. (-OCOR 2 -) m ยท ( -OR 3 -) n is, (- OCOR 2 -) units and (-OR 3 -) represents a block polymer chain or a random copolymer chain consisting of units. [Selection figure] None |