Patent ID: 8323629
Filing Date: 2012-12-04
Classification: A61K,A61Q

Abstract:
1. An external preparation for skin, comprising ingredients (a), (b), and (c), wherein the external preparation for skin has a pH value within the range of 2.0 to 5.0 and is adapted to be removed after being applied to the skin: (a) at least one of the members selected from the group consisting of α-hydroxy acids, the ingredient (a) being contained in a containing quantity within the range of 1.0 to 7.0 mass %, (b) a crosslinked type N,N-dimethylacrylamide-2-acrylamido-2-methylpropane sulfonic acid sodium salt copolymer, the ingredient (b) being contained in a containing quantity within the range of 0.1 to 3.0 mass %, and (c) an associating thickener constituted of a compound that is represented by the following general formula (1), the ingredient (c) being contained in a containing quantity within the range of 0.1 to 3.0 mass %: wherein R 1 represents a hydrocarbon group, R 2 and R 4 independently represent alkylene groups having 2 to 4 carbon atoms, which alkylene groups may be identical or different from each other, or a phenylethylene group, R 3 represents a hydrocarbon group, which may optionally have a urethane bond, R 5 represents a branched chain or secondary hydrocarbon group, m represents a number of at least 2, h represents a number of at least 1, k represents a number within the range of 1 to 500, and n represents a number within the range of 1 to 200.