Chitosan derivative and its production method, O / W type emulsified composition, and cosmetics

摘要

PROBLEM TO BE SOLVED: To provide a chitosan derivative having excellent emulsification performance in a neutral to alkaline range, which can prepare an emulsifying composition by finely dispersing various oils in water. SOLUTION: A first substituent derived from an acylation modifier and a second substituent derived from a siloxane compound represented by the general formula (1) are introduced into chitosan, and the second substituent is used. A chitosan derivative in which the value of the ratio (A / S) of the introduction rate (A) of the first substituent to the introduction rate (S) is 1.0 to 20.0. Z-Y-Si (R1) a {[-O-Si (R2) (R3)] b-R4} 3-a ... (1) (Z: Functional group capable of reacting with the reactive functional group of chitosan) , Y: An alkylene group having 2 to 8 carbon atoms which may have an oxygen atom or the like, R1, R2, R3, and R4: a monovalent organic group having 1 to 8 carbon atoms, or the general formula (2) (-). Group represented by O-Si (R5) (R6) (R7))) [Selection diagram] None