Emulsion composition
View Patent ↗An emulsion composition of the present invention includes (A) a salt of a higher fatty acid ester of ascorbic acid-2-phosphoric acid ester, (B) a polyglycerin fatty acid monoester including polyglycerin having a mean polymerization degree of 8 to 12 and an unsaturated fatty acid residual group of 14 to 22 carbon atoms, (C) a polyglycerin fatty acid monoester comprising polyglycerin having a mean polymerization degree of 2 to 6 and an unsaturated fatty acid residual group of 14 to 22 carbon atoms, and (D) a hydrocarbon oil, wherein the blending ratio by mass between the component (B) and the component (C) is in the range of 1:1 to 3:1, and the blending ratio by mass between the total of the components (B) and (C) and the component (D) is in the range of 10:1 to 1:4. By the use of the emulsion composition of the present invention, a skin external preparation can be provided which is prevented from decrease of a salt of a higher fatty acid ester of ascorbic acid-2-phosphoric acid ester attributable to decomposition of the salt, is excellent in retention of moisture, and has a beautiful appearance.
1. An emulsion composition comprising:
(A) a salt of a higher fatty acid ester of ascorbic acid-2-phosphoric acid ester, said higher fatty acid ester of ascorbic acid-2-phosphoric acid ester being represented by the following formula (1):
wherein R is a higher fatty acid residual group,
(B) polyglyceryl-10 oleate,
(C) polyglyceryl-2 oleate, and
(D) squalane or liquid paraffin,
wherein the blending ratio by mass between the component (B) and the component (C), (B):(C), is in the range of 1:1 to 3:1, and the blending ratio by mass between the total of the components (B) and (C) and the component (D),(B)+(C):(D), is in the range of 10:1 to 1:4.
2. The emulsion composition as claimed in claim 1 , wherein R in the formula (1) is a residual group of an aliphatic carboxylic acid of 10 to 20 carbon atoms.
3. The emulsion composition as claimed in claim 2 , wherein the aliphatic carboxylic acid is lauric acid, myristic acid, palmitic acid, stearic acid, 2-hexyldecanoic acid or isostearic acid.
4. The emulsion composition as claimed in claim 2 , wherein the aliphatic carboxylic acid is palmitic acid.
5. The emulsion composition as claimed in claim 2 , wherein the aliphatic carboxylic acid is 2-hexyldecanoic acid.
6. The emulsion composition as claimed in claim 1 , wherein the component (A) is a Na salt, a K salt, a Mg salt or a Zn salt.
7. The emulsion composition as claimed in claim 1 , wherein the content of the component (A) is in the range of 0.01 to 20% by mass.
8. The emulsion composition as claimed in claim 1 , wherein the mean emulsion particle diameter is in the range of 1 nm to 200 nm.
9. A skin external preparation, comprising the emulsion composition of claim 1 .
10. A cosmetic comprising the emulsion composition of claim 1 .
11. A method for stabilizing the skin external preparation of claim 9 , comprising preparing the emulsion according to claim 9 having a mean emulsion particle diameter of 1 nm to 200 nm by using, as emulsifying agents, (B) polyglyceryl-10 oleate and (C) polyglyeeryl-2 oleate.