JP2009046466A5 - - Google Patents

Claims (4)

The following components (A), (B) and (C):
(A) Organic carboxylic acid or salt thereof optionally having a hydroxy group
(B) Organic solvent selected from the following (b1) to (b5)
(b1) Compound represented by general formula (1)

[In the formula, R ¹ is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a group R ² —Ph—R ³ — (R ² ; a hydrogen atom, a methyl group or a methoxy group, R ³ ; a bond or a carbon number. 1-3 represents a saturated or unsaturated divalent hydrocarbon group, Ph; paraphenylene group), A represents a bond or a divalent saturated hydrocarbon group having 1 to 4 carbon atoms, and Y and Z represent Each independently represents a hydrogen atom or a hydroxyl group, and p and q each independently represents an integer of 0 to 5. However, when p = q = 0, Z is a hydroxyl group, and R ¹ is neither a hydrogen atom nor a group R ² —Ph—. ]
(b2) N-alkylpyrrolidone or N-alkenylpyrrolidone having a C1-C18 alkyl group or alkenyl group bonded to a nitrogen atom
(b3) C2-C4 alkylene carbonate
(b4) Polypropylene glycol having a number average molecular weight of 100 to 1000
(b5) Lactone or cyclic ketone represented by general formula (2), (3) or (4)

[Wherein, X represents a methylene group or an oxygen atom, R ⁴ and R ⁵ represent different substituents, and a and b each independently represent 0 or 1. ]
(C) At least two silicon atoms of the organopolysiloxane segment constituting the main chain, via an alkylene group containing a hetero atom, the following general formula (5);

(In the formula, R ⁶ represents a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, an aralkyl group or an aryl group, and n represents 2 or 3.)
A poly (N-acylalkyleneimine) segment composed of repeating units represented by
The number average molecular weight of the poly (N-acylalkylenimine) segment is 800-1600,
The mass ratio (a / b) of the organopolysiloxane segment (a) constituting the main chain to the poly (N-acylalkyleneimine) segment (b) is 65/35 to 82/18,
The weight average molecular weight of the organopolysiloxane segment constituting the backbone Ri der 10,000 to 100,000,
A hair cosmetic comprising an organopolysiloxane in which the weight average molecular weight of an organopolysiloxane segment between adjacent poly (N-acylalkylenimine) segments is 1500 to 3500 .   The hair cosmetic according to claim 1, wherein component (A) is a hydroxycarboxylic acid having 2 to 6 carbon atoms or a salt thereof.   The component (B) is at least one selected from dipropylene glycol, 1,3-butanediol, benzyl alcohol, phenoxyethanol, 2-benzyloxyethanol, propylene carbonate and polypropylene glycol (number average molecular weight 300 to 500). Item 3. A hair cosmetic according to item 1 or 2.   The hair cosmetic according to any one of claims 1 to 3, wherein the pH at 25 ° C when diluted 20 times by mass with water is 2.5 to 4.5.