Oil-in-water emulsion composition

Abstract

The present invention is an oil-in-water emulsioncomposition containing a hydrophilic non-ionic surfactant or hydrophilic anionic surfactant, a higher aliphatic alcohol, water, and an oil ingredient which meets specific conditions. This is an oil-in-water emulsion composition with good high temperature stability and usability, and can be used as a cream-like endermic liniment such as a cosmetic.

1 . An oil-in-water emulsion composition comprising a hydrophilic non-ionic surfactant, a higher aliphatic alcohol, water, and an oil ingredient which meets the following conditions (1)-(4): 
 (1) The hydrophilic non-ionic surfactant, the higher aliphatic alcohol, and water form a gel, and the gel thus formed has a transition temperature of 60° C. or higher.    (2) The blend ratio of the hydrophilic non-ionic surfactant which forms said gel is 0.2-1.0 wt % of the total amount of the oil-in-water emulsion composition.    (3) The molar blend ratio of the hydrophilic non-ionic surfactant and the higher aliphatic alcohol which form the aforementioned gel is 1:3.    (4) An extra higher aliphatic alcohol or amphiphilic substance which is not involved in the formation of the α-gel is contained, and its blend ratio is 1-10 wt %.    
     
     
         2 . The oil-in-water emulsion composition of  claim 1  wherein said oil-in-water emulsion composition is a cream-like endermic liniment.  
     
     
         3 . An oil-in-water emulsion composition containing a hydrophilic anionic surfactant, a higher aliphatic alcohol, water, and an oil ingredient which meets the following conditions (1)-(4): 
 (1) The hydrophilic anionic surfactant, the higher aliphatic alcohol, and water form a gel, and the gel thus formed has a transition temperature of 60° C. or higher.    (2) The blend ratio of the hydrophilic anionic surfactant which forms said gel is 0.1 wt % or more and less than 0.5 wt % of the total amount of the oil-in-water emulsion composition.    (3) The molar blend ratio of the hydrophilic anionic surfactant and the higher aliphatic alcohol which form the aforementioned gel is 1:3.    (4) An extra higher aliphatic alcohol or amphiphilic substance which is not involved in the formation of the gel is contained, and its blend ratio is 0.5-10 wt %.    
     
     
         4 . The oil-in-water emulsion composition of  claim 3  wherein said oil-in-water emulsion composition is a cream-like endermic liniment.