Containing ascorbic acid and/or it is the composition for external use of its salt and prevents the coloring of composition for external use and/or be the method for the precipitation of crystallization
The present invention provides a kind of stability and the excellent composition for external use of use feeling. The present invention prepares a kind of composition for external use, 30 mass % of glycol or more and 20 mass % of (C) water or less containing (A) at least one kind of 10 mass % or less in the group that the salt by ascorbic acid and ascorbic acid forms, (B) carbon number 3, and the content of ethoxy ethyl glycol is not up to 30 mass %, and pH is 4.5 or less. Or, prepare a kind of composition for external use, it is 30 mass % to 90 mass % and (C) water in the glycol what (A) of at least one kind of 10 weight % to 25 weight %, (B) carbon number 3 containing (A) in the group that the salt by ascorbic acid and ascorbic acid forms and the ingredient other than (C), and the content of ethoxy ethyl glycol is not up to 30 mass %, (C)/(A)=0.2 to 5 and pH is 2.0 to 6.0.本發明提供一種穩定性且使用感優異之外用組成物。本發明製備一種外用組成物，含有(A)選自由抗壞血酸及抗壞血酸之鹽所組成之群組中的至少1種10質量%以下、(B)碳數3個之二醇30質量%以上、及(C)水20質量%以下，並且乙氧基乙二醇的含量未達30質量%，且pH為4.5以下。或者，製備一種外用組成物，含有(A)選自由抗壞血酸及抗壞血酸之鹽所組成之群組中的至少1種10重量%至25重量%、(B)碳數3個之二醇於(A)及(C)以外的成分中為30質量%至90質量%、及(C)水，並且乙氧基乙二醇的含量未達30質量%，(C)/(A)＝0.2至5，及pH為2.0至6.0。
