| 摘要 |
PURPOSE:To obtain a defoaming agent excellent in both of defoaming effect and foaming suppressing effect, by using higher fatty acid having an oxyalkylene group and an oxyphenylethylene group. CONSTITUTION:A compound represented by formula (wherein R is a 5-21C saturated or unsaturated hydrocarbon group, AO is either one of an oxyethylene group, an oxypropylene group and an oxybutylene group, SO is a phenylethylene group, m is an integer of 0-3 and n is an integer of 1-3) is used as a defoaming agent. This compound is synthesized by using higher fatty acid as a stock material but decomposed fatty acid obtained from natural animal and vegetable oils and fats or synthetic fatty acid having a side chain is used. As the oxyalkylene group, an oxyethylene group, an oxypropylene group and an oxybutyl group are used and, as the oxyphenylethylene group, styrene oxide is used and these groups are successively added to fatty acid. This defoaming agent is used alone or in combination with the other defoaming agent. It is pref. to use this defoaming agent in concn. of 1-5,000ppm.
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