Hair treatment method
A method for treating hair, comprising steps 1 and 2 below: (step 1) applying a hair dye composition to hair to dye the hair; and (step 2) applying a hair treatment agent to the hair subjected to hair dyeing in the step 1, the hair treatment agent comprising the following components (A), (B) and (C) and having a pH of 4 or less or 8 or more: (A) an epoxy-aminosilane copolymer which is a reaction product of the following compounds (a) to (d): (a) a polysiloxane having at least two oxiranyl groups or oxetanyl groups; (b) a polyether having at least two oxiranyl groups or oxetanyl groups; (c) an aminopropyltrialkoxysilane; and (d) a specific primary and secondary amines; (B) water; and (C) a pH adjuster.
1 . A method for treating hair, the method comprising:
(1) applying a hair dye composition to hair to dye the hair; and
(2) successively applying a hair treatment agent to the hair subjected to hair dyeing in the applying (1), wherein the hair treatment agent has a pH of 4 or less and comprises the following components:
(A) polysilicone-29 in an amount of 0.5% to 2% by weight;
(B) water;
(C) a pH adjuster which is one or more selected from the group consisting of phosphoric acid, succinic acid, lactic acid, malic acid and citric acid; and
dipropylene glycol.
2 . The method for treating hair according to claim 1 , wherein the pH adjuster is one or more selected from the group consisting of lactic acid, malic acid and citric acid.
3 . The method for treating hair according to claim 1 , wherein a mass ratio of the component (C) to the component (A), (C)/(A), in the hair treatment agent is 0.05 or more and 15 or less.
4 . The method for treating hair according to claim 1 , wherein the hair treatment agent further comprises an organic solvent as component (D).
5 . The method for treating hair according to claim 4 , wherein the component (D) is one or more selected from the group consisting of linear alcohols having 1 to 4 carbon atoms and aromatic alcohols.
6 . The method for treating hair according to claim 4 , wherein a content of the component (D) in the hair treatment agent is 1 mass % or more and 40 mass % or less.
7 . The method for treating hair according to claim 1 , wherein the successively applying (2) does not include either a step of exposing the hair to an electromagnetic radiation using an apparatus for supplying an electromagnetic radiation or a step of mechanically reshaping the hair.
8 . A method for improving chroma of a color of dyed hair, the method comprising carrying out (2) on hair after hair dyeing treatment:
(2) successively applying a hair treatment agent to hair after hair dyeing, wherein the hair treatment agent has a pH of 4 or less and comprises the following components:
(A) polysilicone-29 in an amount of 0.5% to 2% by weight;
(B) water;
(C) a pH adjuster which is one or more selected from the group consisting of phosphoric acid, succinic acid, lactic acid, malic acid and citric acid; and
dipropylene glycol.
9 . The method for treating hair according to claim 1 , wherein the hair treatment agent comprises (C1) lactic acid.
10 . The method for treating hair according to claim 8 , wherein the hair treatment agent comprises (C1) lactic acid.
11 . The method for treating hair according to claim 8 , wherein a mass ratio of the component (C) to the component (A), (C)/(A), in the hair treatment agent is 0.05 or more and 15 or less.