Cosmetics contg. hydroxyalkyl-urea derivs. - useful as skin moisture regulators

摘要

Cosmetics, esp. for skin care, contain 1-20 (pref. 3-10) wt.% of a hydroxyalkyl-urea deriv. of formula (I): R1R2N-CO-NR3R4 (where R1-R4 are H, 1-4C alkyl or 2-6C hydroxyalkyl (contg. 1-5 OH gps), provided that >=1 is hydroxyalkyl). (I) are pref. prepd. by reacting opt. substd. 2-oxazaolidones with sec. or esp. primary amines at high temp. (esp. 100-200 degrees C). (I) act as skin moisture regulators which, unlike conventional acids and salts, do not affect the stability of low-viscosity o/w emulsions used as cosmetic bases.