Patent ID: 8865146

Claim:
A hair styling method comprising: applying a hair cosmetic composition comprising component (A) to the hair: Component (A): an organopolysiloxane comprising at least two silicon atoms in an organopolysiloxane segment (a) constituting a main chain of the organopolysiloxane that are each bound to a poly(N-acylalkyleneimine) segment (b) consisting of repeating units represented by general formula (1) via an alkylene group containing a hetero atom: wherein R 1 is a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, an aralkyl group, or an aryl group; and n is 2 or 3; the number-average molecular weight of each poly(N-acylalkyleneimine) segment (b) is from 1,200 to 5,500, the mass ratio of the organopolysiloxane segment (a) to the poly(N-acylalkyleneimine) segments (b), (a/b), is from 35/65 to 60/40, the weight-average molecular weight of each poly(N-acylalkyleneimine) segment (b) is from 1,300 to 5,500, and the weight-average molecular weight of the organopolysiloxane segment (a) is from 7,000 to 100,000, wherein: in component (A) the organopolysiloxane segments (a) and the poly(N-acylalkyleneimine) segments (b) are arranged as set forth in Formula (2), such that the repeating unit is a moiety which is surrounded by a broken line between two points, from a binding point where the poly(N-acylalkyleneimine) segment is bound to the organopolysiloxane segment (binding point α) to a binding point where the adjacent poly(N-acylalkyleneimine) segment is bound to this organopolysiloxane segment (binding point β), which is a segment composed of a single R 2 SiO unit, a single R 6 , and (y+1)-number of (R 2 ) 2 SiO units, and the poly(N-acylalkyleneimine) segments is —W—R 7 binding to the R 6 : wherein in the Formula (2), each R 2 is independently an alkyl group having 1 to 22 carbon atoms or a phenyl group; R 6 is an alkylene group containing heteroatom; —W—R 7 is a poly(N-acylalkyleneimine) segment; R 7 is a residue of a polymerization initiator; and y is a positive number; forming the hair style at a hair temperature of 50° C. or higher; and subsequently cooling the hair temperature to lower than 50° C. to fix the formed hair style.