Many cosmetic stick compositions containing a continuous phase of a water-immiscible cosmetic oil structured by a fibre-forming amido structurant and an active cosmetic ingredient either exhibit poor physical stability when formed, or cannot be made readily using conventional processes for making stick compositions. The problem can be ameliorated or overcome by the use of a combination of amido structurants comprising in class (i) an N-acylaminoacid amide in which the N-acyl substituent has the formula —CO—R
X
in which R
X
represents a branched C
6
to C
11
alkyl group in combination with a further amido structurant, (class (ii), including a polyamido-substituted cyclohexane, an amido derivative of di or tricarboxylic acids or an hydroxystearamide and particularly employing an N-acylaminoacid amide in which the N-acyl substituent contains a linear alkyl group, or a cyclodipeptide.
许多棒状化妆品组合物含有由成纤
氨基结构剂和活性化妆品成分构成的
水不溶性化妆品油连续相,这些组合物要么在形成时物理稳定性差,要么不能用传统的棒状组合物制造工艺轻易制成。使用由以下成分组成的
氨基结构剂组合可以改善或克服上述问题 (i) N-酰基
氨基酰胺,其中 N-酰基取代基的式为 -CO-R
X
其中 R
X
代表支链 C
6
至 C
11
类),包括多
氨基取代的
环己烷、二或
三羧酸的
氨基衍
生物或羟基硬脂酰胺,特别是采用 N-酰基取代基含有线性烷基的 N-酰基
氨基酰胺,或环二肽。