| 摘要 |
The present invention provides an O/W emulsion composition which is excellent in UV protection ability, formulation stability, and feeling in use. The O/W emulsion composition according to the present invention is characterized by comprising the following components (a) and (b):
(a) organic UV absorbers comprising the following components (a1), (a2), and (a3):
(a1) octocrylene,
(a2) ethylhexyl methoxycinnamate,
(a3) 4-t-butyl-4'-methoxydibenzoylmethane; and
(b) a polyoxyethylene/polyoxyalkylene alkyl ether block polymer represented by the following formula (1) or (2);
(Compound 1)
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 1 O-(PO)m-(EO)n-H€ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein R 1 is a hydrocarbon group having 16 to 18 carbon atoms; PO is an oxypropylene group, EO is an oxyethylene group, and PO and EO are added to each other in block form; and m and n respectively represent average addition mole number of PO and EO, 4‰¤m<70, 10‰¤n<70, and m< n;
(Compound 2)
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 2 O-(AO)p-(EO)q-R 3 €ƒ€ƒ€ƒ€ƒ€ƒ(2)
wherein R 2 and R 3 are either identical to or different from each other, and each of them is a hydrocarbon group having 1 to 4 carbon atoms; AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, and AO and EO are added to each other in block form; and p and q respectively represent average addition mole number of AO and EO, 1‰¤p‰¤70, 1‰¤q‰¤70, and 0.5<(q/(p + q))<0.8, and
wherein average particle size of the emulsion particles comprising the component (a) is 800 nm or less. |
