Patent ID: 7569211

Claim:
A skin-whitening cosmetic composition comprising an ascorbic acid derivative comprising an L-ascorbic acid-2-phosphate ester or a salt thereof, and an additive, wherein the phosphate ester has a branched alkyl group which is branched at position 2, wherein the L-ascorbic acid-2-phosphate ester is represented by formula [1], wherein R is a hydrogen (H) atom or an alkyl group branched at position 2 and including 4 to 30 carbon atoms, but both R groups are not hydrogen (H) atoms, and wherein said branched alkyl group is 2-heptylundecyl group, 2-octyldecyl group, 2-octyldodecyl group, 2-hexyldecyl group, 2-hexyldodecyl group, 2-isoheptylisoundecyl group or 2-( 1,3,3-trimethyl-n-butyl)-5,7,7-trimethyl-n-octyl group.