Abstract
The hardness of a mixture prepared from a heat-dissolved solution of a wax and oil for cosmetics varied with the properties of the oil used. These properties were thus examined so as to clarify the mechanism for variation in hardness.The hardness of solid paraffin-oil mixture was found to be closely related to the solubility (g/100g solution) of solid paraffin in the oil used. That is, a solid paraffin-oil mixture comprising the oil with a lower solubility of solid paraffin gave rise to a higher degree of hardness. For a carnauba wax-oil mixture, the same relationship between hardness and solubility as that of the solid paraffin-oil mixture was found. Consequently, in the preparation of mixtures of a wax and various oils, their hardness can be predicted on the basis of the solubility of wax in the oils, which in turn can be estimated from the solubility parameters of the wax and the oil, as well as from the oil molecular weights.
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