Hair treatment process providing dispersed colors by light diffraction
View Patent ↗Hair was coated with polymer-containing fluid and then hot pressed to form a composite of hair and a polymer film imprinted with a nanopattern. Polychromatic light incident on the nanopattern is diffracted into dispersed colored light.
1. A hair treatment process comprising:
coating hair with a fluid that includes a suitable polymer having a suitable glass transition temperature,
inserting the hair coated with the fluid into a pressing device, the pressing device including a heating block configured with a nanopattern designed to diffract incident light into dispersed colors, the pressing device capable of transforming the fluid-coated hair into a hair-polymer film composite, the composite having a surface with a nanostructured surface pattern that is complementary to the nanopattern from the heating block,
pressing the hair coated with the fluid under conditions suitable for forming the composite,
cooling the composite and removing it from the pressing device,
wherein polychromatic light incident on the nanostructured surface pattern is diffracted into dispersed colors that are visible on the nanostructured surface pattern of the composite.
2. The process of claim 1 , further including cleaning and drying the hair prior to coating with the fluid.
3. The process of claim 1 , wherein the fluid comprises a dispersion of a polymer.
4. The process of claim 1 , wherein the polymer has a glass transition temperature of from about 55 degrees Celsius to about 90 degrees Celsius.
5. The process of claim 1 , wherein the fluid includes a plasticizer.
6. The process of claim 1 , wherein the fluid includes a surfactant.
7. The process of claim 1 , wherein the fluid is an aqueous fluid.
8. The process of claim 1 , wherein the fluid includes alcohol.
9. The process of claim 8 , wherein the alcohol comprises ethanol.
10. The process of claim 1 , wherein the polymer is selected from a poly-lactic acid polymer, an acrylate polymer, a polyvinyl alcohol polymer, a polyurethane, copolymers thereof, and mixtures thereof.
11. The process of claim 1 , wherein the step of pressing the hair comprises pressing at a pressure from about 3 psi to about 7 psi at a temperature above the glass transition temperature of the polymer.
12. The process of claim 1 , wherein the hair pressing is from about 1 minute to about 4 minutes.
13. The process of claim 1 , further comprising forming the heating block configured with a nanopattern designed to diffract incident polychromatic light into dispersed colors.
14. The process of claim 13 , wherein the heating block is formed by a process selected from focused ion beam milling, lithography, diamond turning, and scribing.
15. The process of claim 1 , wherein the polychromatic light is selected from white light, sunlight, and theatrical light.
16. The process of claim 1 , wherein the nanostructured pattern is selected from a sawtooth pattern, spiral pattern, a ring pattern, an Archimedean pattern, an ellipsoidal pattern, a pattern having hyperbolic rings, and a pattern having parabolic rings.
17. The process of claim 1 , wherein the sawtooth pattern includes straight lines with sawtooth depth tapers.