| 摘要 |
<p>An aqueous defoaming/antifoaming composition which comprises: (a) from 5 to 75 parts by weights of a water-soluble non-ionic polyoxyalkylene condensate derived from an active hydrogen-containing precursor or an ester thereof and from at least two alkylene oxides, (b) a water-soluble aromatic sulphonate salt of the formula: <CHEM> where a is 1 or 2, R is a C1-4 alkyl group which may be the same or different when a is 2 and M is a cation, such that the weight ratio of (b) to (a) is at least 1:15, and (c) from 20 to 90 parts by weight of water. </p> |
