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Polyglycerol esters were prepared by esterifying fatty acids with polyglycerol in the presence of alkali catalyst at 230°C. They were analyzed by gel permeation chromatography or the like. And their surface activities (surface tension, wetting power, emulsion stability etc.) were determined in comparison with other usual nonionic surfactants.The following results are obtained.1) The contents of free polyglycerol in polyglycerol mono-ester are shown to be ca. 20%.2) The surface tension of 10-1-L (decaglyceryl mono laurate) is 27.6 dyne/cm, which is considerably lower than that of other nonionic surfactants.3) The wetting power are less effective than that of other usual nonionic surfactants.4) In foaming power, 10-1-L is a little superior than sucrose mono laurate.5) 10-1-s (decaglyceryl mono stearate) has the widest region of stable emulsion among the obtained polyglycerol esters.
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