External preparation for skin and cleansing agent for skin

Abstract

It is intended to provide an external preparation for skin, which has an effect of improving rough skin, and is excellent in feeling of use, particularly excellent in smoothness, free of stickiness, and excellent in stability. Further, it is intended to provide a cleansing agent for skin which is particularly excellent in usability, and has an excellent effect of removing cosmetics. That is, the external preparation for skin according to the invention is characterized by containing a block type alkylene oxide derivative represented by the following formula (I). Y-[O(EO)a-(AO)b-(EO)c-R]k (I) (In the formula, Y is a residue obtained by removing a hydroxy group from a polyhydric alcohol having 3 to 6 hydroxy groups, k is the number of hydroxy groups of the polyhydric alcohol, EO is an oxyethylene group, AO is an oxyalkylene group having 3 to 6 carbon atoms, and the respective groups are added in the form of a block. a k, b k and c k are average added mole numbers of oxyethylene group, oxyalkylene group having 3 to 6 carbon atoms and oxyethylene group, respectively, and satisfy the following relationships: 0 = a k = 100, 1 = b k = 100, 0 = c k = 100, with the proviso that (a+c) k > 1. The ratio of the total oxyethylene groups in the formula (I) to the sum of the total oxyethylene groups in the formula (I) and oxyalkylene groups having 3 to 6 carbon atoms is 10 to 80% by mass. The R groups may be the same or different and each is a hydrocarbon group having 1 to 4 carbon atoms.) Further, the cleansing agent for skin according to the invention is characterized by containing 0.01 to 70% by mass of a block type alkylene oxide derivative represented by the above formula (I) and 0.1 to 20% by mass of a moisturizing agent.

Description

[0001] related application [0002] This application claims the benefit of Japanese Patent Application No. 2006-269121 filed on September 29, 2006 and Japanese Patent Application No. 2006-269123 filed on September 29, 2006, which are incorporated herein by reference. technical field [0003] The present invention relates to external skin preparations and skin cleansers, and more particularly to improvements in skin external preparations and skin cleansers containing block type oxyalkylene derivatives as active ingredients. Background technique [0004] As important elements for evaluating an external preparation for skin, the function of maintaining a beautiful skin state and the feeling of use can be mentioned. On the other hand, as a typical method for attempting to improve the stability of the base, blending a surfactant can be cited. [0005] In order to maintain a beautiful skin condition, it is important to prevent or improve skin roughness, smooth out skin grooves an...

AI Technical Summary

Problems solved by technology

[0013] However, in detergents formulated with surfactants with strong detergency or solvents with strong dissolving power, there is a problem that, due to their strong dissolving power, stinging or redness occurs after washing, or increased Irritation from cosmetic products used thereafter

However, even when this specific oxyalkylene derivative is blended, problems such as a harsh feeling on the skin after washing still remain, and this is considered to be caused by the surfactant blended together.

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