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AssigneeSph Corporation
InventorsMitsuta SHIBATA, Kazuko SHIBATA, Yoshio NAKANO, Yasushi HAYASAKI
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Provided is a method for productively producing a liquid or a paste soap composition which, even at low temperatures, maintains a liquid or paste state for a long time without separating, is gentle on the skin and eyes, and has high foaming power and good cleaning power. In this production method for a soap composition containing a sodium of a higher fatty acid and a potassium of a higher fatty acid, a liquid soap composition is prepared by: heating, to at least 80° C., and melting a mixed saturated fatty acid which is composed of 12- to 18-carbon saturated fatty acids containing 85 to 100 mol % of a 12- and a 14-carbon saturated fatty acid and does not contain an 8- to 10-carbon saturated fatty acid; then adding a cooling liquid composed of glycerin and water to the mixed saturated fatty acid all at once, cooling the mixture to a temperature at least 20° C. lower than the heated temperature, and then heating the mixture again and holding the mixture at a temperature between 40 and 55° C.; adding a mixed alkaline aqueous solution all at once to the mixed fatty acid-containing liquid that has been heated and held at said temperature, said mixed alkaline aqueous solution being obtained by mixing potassium hydroxide and/or potassium carbonate and sodium hydroxide and/or sodium carbonate in a molar ratio in the range from 90/10 to 30/70; and, while agitating, heating the mixture and then holding the mixture at a temperature between 80 and 95° C. in order to neutralize the mixture.
A production method for a soap composition containing sodium of a higher fatty acid and potassium of a higher fatty acid, according to which a liquid soap composition is prepared by heating to 80° C. or higher and melting a mixed saturated fatty acid, which is a mixed fatty acid made of saturated fatty acids of which the carbon numbers are 12 to 18 that include 85 through 100 mol % of saturated fatty acids of which the carbon numbers are 12 and 14, and does not include saturated fatty acids of which the carbon numbers are 8 through 10, and then cooling the mixed saturated fatty acid to a temperature that is lower than the heated temperature by at least 20° C. by adding at once a coolant made of glycerin and water, and after that, again heating the mixed saturated fatty acid to 40 through 55° C., maintaining the mixed saturated fatty acid at the temperature, adding at once a mixed alkaline solution where potassium hydroxide and/or potassium carbonate and sodium hydroxide and/or sodium carbonate are mixed together in a range of the mol ratio of 90/10 through 30/70 to the mixed fatty acid containing liquid that is maintained at the temperature, stirring the liquid so that the temperature rises to 80 to 95° C., and maintaining the liquid at the temperature for neutralization.
A production method for a soap composition containing sodium of a higher fatty acid and potassium of a higher fatty acid, according to which:
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