| 摘要 |
<p>A lubricating composition which comprises: (A) a polyalkyleneglycol of the general formula (I) : RO (R<SUP>a</SUP>O) <SUB>x </SUB>(R<SUP>b</SUP>O) <SUB>y</SUB> (R<SUP>c</SUP>O) <SUB>z</SUB>R<SUP>d</SUP> (I); wherein: R is a C<SUB>4</SUB> to C<SUB>6</SUB> substituent comprising a heterocyclic ring, in which the heteroatom (s) in said ring(s) is (are) oxygen and/or sulphur, R<SUP>a</SUP> is a C<SUB>2</SUB> alkylene group, R<SUP>b</SUP> is a C<SUB>3</SUB> alkylene group, R<SUP>c</SUP> is a C<SUB>4</SUB> alkylene group, R<SUP>d</SUP> is the same as R, or is a hydrogen atom or a C<SUB>1</SUB>-C<SUB>20</SUB> alkyl or C<SUB>1</SUB>-C<SUB>20</SUB> acyl group, x, y, z are each independently 0 or an integer in the range of from 1 to 100, and x + y + z = 4 to 100 ; and (B) an ester of a alcohol containing two or more hydroxyl groups with a mono- or dicarboxylic acid, or an ester of an dicarboxylic acid with an alcohol containing one hydroxyl group.</p> |
