Hair styling method

1. A hair styling method, comprising:

(A) increasing the number of intersections of hair fibers to enhance the volume of hair, and

(B) applying an aerosol hair cosmetic composition capable of forming a film having a film strength, as measured by a film strength evaluation method, of 800 gf/cm 2 or greater, wherein said hair cosmetic composition comprises components (C) and (D) at a mass ratio (D)/(C) of from 0.25 to 20:

(C) at least one copolymer selected from the group consisting of (C1) and (C2):

(C1) copolymers each composed of:

(a) from 30 to 80 mass % of a (meth)acrylamide monomer represented by formula (1):

wherein R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 may be the same or different and each represents a hydrogen atom or an alkyl group having from 4 to 12 carbon atoms, with the proviso that both R 2 and R 3 do not represent a hydrogen atom,

(b) from 2 to 50 mass % of a (meth)acrylamide monomer represented by formula (2):

wherein R 1 has the same meaning as defined above, R 4 and R 5 may be the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atom,

(c) from 0 to 30 mass % of a (meth)acrylic acid ester monomer or a (meth)acrylamide monomer represented by formula (3):

wherein R 1 has the same meaning as defined above, R 6 represents an alkylene group having 2 or 3 carbon atoms, R 7 and R 8 may be the same or different and each represents a methyl group or an ethyl group, and a represents a number of 0 or 1, and

(d) from 0 to 40 mass % of a (meth)acrylic acid ester monomer represented by formula (4):

wherein R 1 has the same meaning as defined above, R 9 and R 10 may be the same or different and each represents an alkylene group having from 2 to 4 carbon atoms, R 11 represents a hydrogen atom, an alkyl group having from 1 to 10 carbon atoms, or a phenyl group, and b and c each represents a number from 0 to 50, with the proviso that both b and c do not stand for 0, and

(C2) copolymers each composed of:

(a) from 30 to 80 mass % of a (meth)acrylamide monomer represented by formula (5):

wherein R 12 represents a hydrogen atom or a methyl group, R 13 and R 14 may be the same or different and each represents a hydrogen atom or an alkyl group having from 4 to 12 carbon atoms or R 13 and R 14 are coupled to each other to form a ring together with a nitrogen atom adjacent thereto,

(b) from 5 to 45 mass % of a (meth)acrylic acid ester monomer represented by formula (6):

wherein R 12 has the same meaning as defined above and R 15 represents an alkyl group having from 1 to 4 carbon atoms,

(c) from 2 to 30 mass % of a (meth)acrylic acid ester monomer or a (meth)acrylamide monomer represented by formula (7):

wherein R 12 has same the meaning as defined above, R 16 represents an alkylene group having 2 or 3 carbon atoms, R 17 and R 18 may be the same or different and each represents a methyl group or an ethyl group, and a represents a number of 0 or 1, and

(d) from 0 to 30 mass % of a (meth)acrylic acid ester monomer represented by formula (8):

wherein R 12 has the same meaning as described above, R 19 and R 20 may be the same or different and each represents an alkylene group having from 2 to 4 carbon atoms, R 21 represents a hydrogen atom or a methyl group, and b and c each represents a number from 0 to 50 with the proviso that both b and c do not stand for 0 and

(D) an anionic film-forming polymer.

2. The hair styling method according to claim 1 , wherein (B) is performed subsequent to (A) and said applying is to the hair.

3. The styling method according to claim 1 , wherein said hair cosmetic composition further comprises (E) a poly(N-acylalkyleneimine)-modified silicone.

4. The styling method according to claim 3 , wherein component (E) is present at an amount ranging from 0.01 to 3 mass % of the hair cosmetic composition.

5. The styling method according to claim 3 , wherein:

component (C) is present at an amount ranging from 0.1 to 12 mass % of the hair cosmetic composition;

component (D) is present at an amount ranging from 0.5 to 12 mass % of the hair cosmetic composition; and

component (E) is present at an amount ranging from 0.01 to 3 mass % of the hair cosmetic composition.

6. The styling method according to claim 5 , wherein said hair cosmetic composition comprises from 0 to 5 mass % of a solvent or nonionic surfactant.

7. The styling method according to claim 1 , wherein component (C) is present at an amount ranging from 0.1 to 12 mass % of the hair cosmetic composition.

8. The styling method according to claim 1 , wherein component (C) is present at an amount ranging from 0.5 to 12 mass % of the hair cosmetic composition.

9. The styling method according to claim 8 , wherein said hair cosmetic composition comprises from 0 to 5 mass % of a solvent or nonionic surfactant.

10. The styling method according to claim 1 , wherein component (D) is present at an amount ranging from 0.5 to 12 mass % of the hair cosmetic composition.

11. The styling method according to claim 1 , wherein said hair cosmetic composition comprises from 0 to 5 mass % of a solvent or nonionic surfactant.

12. The styling method according to claim 1 , wherein said hair cosmetic composition comprises 0 mass % of a solvent or nonionic surfactant.