| 摘要 |
<p>An O/W emulsion composition having excellent preparation stability, feeling of use and ultraviolet light blocking properties. The O/W emulsion composition has the first oil phase and second oil phase described below, which are separately dispersed in a water phase. (i) a first oil phase which is formed by using a polyoxyethylene/polyoxyalkylene alkyl ether block polymer represented by general formula (1) or (2) as an emulsifying agent, and contains an organic ultraviolet absorbent, while having an average particle diameter of not more than 700 nm (ii) a second oil phase which is formed by using an alkyl-modified carboxyvinyl polymer as an emulsifying agent, and contains a silicone oil R1O-(PO)m-(EO)n-H (1) (In the formula, R1 represents a hydrocarbon group having 16-18 carbon atoms; PO represents an oxypropylene group; EO represents an oxyethylene group; PO and EO are added in blocks; and m and n respectively represent average mole numbers of added PO and EO and satisfy 70 > m > 4, 70 > n > 10 and n > m.) R2O-(AO)p-(EO)q-R3 (2) (In the formula, R2 and R3 may be the same or different and each represents a hydrocarbon group having 1-4 carbon atoms; AO represents an oxyalkylene group having 3-4 carbon atoms; EO represents an oxyethylene group; AO and EO are added in blocks; and p and q respectively represent average mole numbers of added AO and EO and satisfy 1 = p = 70, 1 = q = 70 and 0.2 < (q/(p + q)) < 0.8.)</p> |
