| 摘要 |
<p>A synthetic lubricating oil comprising as a base oil at least one kind of a carbonic acid ester selected from the group consisting of: [I] a carbonic acid ester represented by the general formula (1) <CHEM> wherein R<1> and R<2> are each an alkyl or dihydric alcohol residue, R<3> is an alkylene, and a is 0 - 30, [II] a carbonic acid ester represented by the general formula (2) <CHEM> wherein X<1> is -H or <CHEM> R<4>-R<6> are each an alkyl, cycloalkyl or neopentyl type polyol residue, R<7> is an alkyl, b is 1 or 2, c is 0 or 1 (b + c = 2), d is 0 - 30, and e is 1 - 3, and [III] a carbonic acid ester of which alcohol moieties are (A) a monohydric alcohol, (B) a dihydric alcohol, and (C) a neopentyl type polyol or dimer or trimer thereof.</p> |
