Hair cosmetic composition containing a poly(N-acylalkyleneimine)-organopolysiloxane block or graft copolymer

A hair cosmetic comprising:

• (a) from 0.01 to 10% by weight of a poly(N-acylalkyleneimine-organopolysiloxane block or graft copolymer having a poly(N-acylalkyleneimine) segment and an organopolysiloxane segment, said poly(N-acylalkyleneimine) segment comprising a repeating unit of the formula (I):
• ##STR9## wherein R.sub.1 represents a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, a cycloalkyl group having 3 to 22 carbon atoms, an aralkyl group having 7 to 22 carbon atoms or an aryl group having 6 to 22 carbon atoms, and n is 2 or 3;
• and said organopolysiloxane segment having a formula selected from the group consisting of formulae (V) to (X):
• ##STR10## wherein R.sub.3 represents a CH.sub.3, OCH.sub.3 or OC.sub.2 H.sub.5 ;
• said poly(N-acylalkyleneimine) segment and said organopolysiloxane segment being present in a weight ratio of from 1/20 to 20/1, and said block or graft copolymer having a molecular weight of from 500 to 500,000, in which said poly(N-acylalkyleneimine) segment has a molecular weight of from 150 to 50,000 and said organopolysiloxane segment has a molecular weight of from 300 to 300,000, and
• (b) from 0.05 to 20% by weight of a film-forming polymer selected from the group consisting of polyvinyl pyrrolidone polymer compounds, acidic vinyl ether polymer compounds, acidic polyvinyl acetate compounds, acidic acryl polymer compounds, amphoteric acryl polymer compounds, basic acryl polymer compounds, cellulose derivatives, chitin derivatives and chitosan derivatives.