Resin for hair cosmetics, and hair cosmetic

Abstract

To provide a resin for hair cosmetic which is free from stickiness and highly compatible in fixing properties and combing properties without impairing performances such as water resistance, colorability and washability, and to provide a hair cosmetic. The hair cosmetics resin is obtained by bonding a poly(N-acylalkyleneimine) segment (b) comprising a repeating unit represented by formula (1) to at least two silicon atoms of an organopolysiloxane segment (a) constituting a main chain via an alkylene group containing a hetero atom, wherein the alkylene group containing a hetero atom is either a group represented by formula (i) or (ii), the mass average molecular weight of the segment (a) is 10,000 to 100,000, the number average molecular weight of the segment (b) is less than 800, and the mass ratio of (a) to (b) [(a)/(b)] is 58/42 to 90/10. [In formula (1), R1 represents a hydrogen atom, C1-22 alkyl group, aralkyl group, or aryl group, and n represents 2 or 3.]

Dependencies are inferred from the claim text.