| 摘要 |
PROBLEM TO BE SOLVED: To obtain a defoaming agent remarkably excellent in defoaming property (foam breaking and suppressing effects) and particularly a defoaming agent exhibiting remarkably excellent defoaming property for an emulsion coating material. SOLUTION: This defoaming agent contains an amide (A) and a hydrocarbon oil (B) in which the content of an aromatic component is 1-6wt.%, the content of a naphthenic component is 25-35wt.%, and the content of a paraffin component is 59-74wt.% and preferably further contains a polyoxyalkylene compound (C) defined by formula (1) and also a hydrophobic silica (D). In formula (1), R is a straight chain alkyl or straight chain alkenyl both having 2 to 6 carbon atoms; OA is an oxyalkylene having 3 to 4 carbon atoms; and (n) is an integer of 10 to 60. COPYRIGHT: (C)2006,JPO&NCIPI
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