Compositions and methods for reshaping keratin-rich substrates and forming adherent flexible films

1. A method for relaxing and reshaping a keratin-rich substrate comprising:

(a) applying a substrate-activating composition to the substrate;

(b) warming and drying the substrate;

(c) applying a fixative composition to the substrate; and

(d) warming and drying the substrate;

wherein the fixative composition comprises a silylated hemiaminal which is formed in situ by the reaction of at least one silanol and at least one organic hemiaminal in the presence of at least one siloxane without formation formaldehyde; and

wherein the substrate-activating component is an aqueous solution having a pH of about 1 to 4 or a pH of about 10 to 13.

2. The method according to claim 1 , wherein steps (b) and (c) are performed simultaneously.

3. The method according to claim 1 , wherein the at least one organic hemiaminal is a linear hemiaminal ether.

4. The method according to claim 1 , wherein the at least one organic hemiaminal is selected from the group consisting of a hemiaminal silyl ether and a hemiacetal silyl ether.

5. The method according to claim 1 , wherein the at least one organic hemiaminal is selected from the group consisting of imidazolidinyl urea, diazolidinyl urea, and polyoxymethylene urea.

6. The method according to claim 1 , wherein the at least one silanol is a monomeric, polymeric, or resinous organosilanol.

7. The method according to claim 1 , wherein the at least one silanol is a hydroxy-terminated polymeric diorganosiloxane.

8. The method according to claim 1 , wherein the at least one silanol is an organosilanetriol or diorganosilanediol.

9. The method according to claim 1 , wherein the fixative composition further comprises an amine bound to a polymeric siloxane.

10. The method according to claim 1 , wherein the fixative composition comprises an organosilanetriol and a diorganosiloxane.