Process and composition for coloring keratin fibers

Abstract

The present invention relates to a process for coloring keratin fibers, preferably hair, comprising the steps of: (i) applying onto the keratin fibers a composition comprising (a) at least one compound chosen from alkylaminosulfonic acids and those of the formula (I) and (II), (b) at least one direct dye, and (c) at least one alkaline agent; (ii) heating the keratin fibers; and (iii) optionally rinsing and/or drying the keratin fibers. The present invention can provide superior coloring efficiency, such as color intensity and color lastingness.

Claims

1. A process for coloring and reshaping keratin fibers comprising: (i) applying onto the keratin fibers a composition comprising: (a) at least one compound of formula (II): ##STR00022## wherein in formula (II): R is chosen from a hydrogen atom, or a linear or branched, C.sub.1-C.sub.5 alkyl group, and n is 0 or 1; (b) at least one direct dye; and (c) at least one alkaline agent; (ii) heating the keratin fibers; and (iii) optionally rinsing and/or drying the keratin fibers.

2. The process according to claim 1, wherein the keratin fibers are hair.

3. The process according to claim 1, wherein the (a) at least one compound is taurine.

4. The process according to claim 1, wherein the amount of the (a) at least one compound ranges from 1% to 30% by weight, relative to the total weight of the composition.

5. The process according to claim 1, wherein the amount of the (a) at least one compound ranges from 5% to 15% by weight, relative to the total weight of the composition.

6. The process according to claim 1, wherein the (b) at least at one direct dye is chosen from basic direct dyes and neutral direct dyes.

7. The process according to claim 1, wherein the (b) at least one direct dye is present in an amount ranging from 0.01% to 25% by weight, relative to the total weight of the composition.

8. The process according to claim 1, wherein the (b) at least one direct dye is present in an amount ranging from 0.1% to 15% by weight, relative to the total weight of the composition.

9. The process according to claim 1, wherein the (c) at least one alkaline agent is present in an amount ranging from 0.01% to 20% by weight, relative to the total weight of the composition.

10. The process according to claim 1, wherein the (c) at least one alkaline agent is present in an amount ranging from 1% to 10% by weight, relative to the total weight of the composition.

11. The process according to claim 1, wherein the composition further comprises at least one organic acid salt of alkaline earth metal.

12. The process according to claim 1, wherein the keratin fibers are heated, during the heating step, to a temperature ranging from 50° C. to 180° C.

13. The process according to claim 1, wherein the keratin fibers are heated, during the heating step, to a temperature ranging from 70° C. to 120° C.

14. The process according to claim 1, wherein the composition is the only active composition used in the process.

15. The process according to claim 1, wherein the pH of the composition ranges from 8.0 to 12.0.

16. A composition comprising: (a) at least one compound chosen from alkylaminosulfonic acids and compounds of formula (II): ##STR00023## wherein in formula (II): R is chosen from a hydrogen atom, or a linear or branched, C.sub.1-C.sub.5 alkyl group, and n is 0 or 1; (b) at least one direct dye; and (c) at least one alkaline agent.

Description

EXAMPLES

(1) The present invention will be described in a more detailed manner by way of examples. However, these examples should not be construed as limiting the scope of the present invention.

Example 1 and Comparative Example 1

(2) {Preparations}

(3) The following liquid compositions according to Example 1 and Comparative Example 1 shown in Table 1 were prepared by mixing the ingredients shown in Table 1. The numerical values for the amounts of the ingredients shown in Table 1 are all based on “% by weight” as active raw materials.

(4) TABLE-US-00001 TABLE 1 Comp. Ex. 1 Ex. 1 Sodium Hydroxide 1.2 — Magnesium Gluconate 0.25 0.25 Ethanolamine 1.22 — Taurine 7.8 — Basic Brown 17 0.07 0.07 3-Methylamino-4-Nitrophenoxyethanol 0.1 0.1 Disperse Violet 1 0.042 0.042 2-Nitro-5-Glyceryl Methylaniline 0.53 0.53 HC Blue No. 2 1.4 1.4 HC Violet No. 2 0.96 0.96 HC Blue No. 14 0.26 0.26 Water qsp 100 qsp 100 pH 10.5 7.3 Delta E (Color Intensity at day of application) 61.4 33.1 Delta E (Color Lastingness (vs. day of application)) 5.4 15.4 Number of curl (Curling Efficacy) Wet hair 5 2 Dry hair 5 2.5

(5) {Evaluations}

(6) (Coloring Procedure of Example)

(7) 3 g of composition according to Example 1 was applied on 1 g of a pre-shampooed Chinese 100% white hair swatch (20 cm) and Japanese natural hair swatch (20 cm). Each of hair swatches was wound onto a 20-mm perm rod (Ohiro digital perm machine ODIS-2) and covered by a physical wrap of a plastic film, and then heated by a digital perm machine for 10 minutes at 90° C. After the hair on rod was cooled at ambient temperature for 5 minutes, the physical wrap was removed, and the hair was then removed from the rod. The hair was then rinsed with tap water, and dried naturally overnight.

(8) (Coloring Procedure of Comparative Example)

(9) 3 g of composition according to Comparative Example 1 was applied on 1 g of a pre-shampooed Chinese 100% white hair swatch (20 cm) and Japanese natural hair swatch (20 cm). Each of hair swatches was wound onto a 20-mm perm rod (Ohiro digital perm machine ODIS-2) and covered by a physical wrap of a plastic film, and then kept at ambient temperature for 15 minutes. After removing the physical wrap, the hair was then removed from the rod, rinsed with tap water, and then dried naturally overnight.

(10) The color intensity, curl lastingness, and curl efficiency were evaluated as follows.

(11) (Color Intensity)

(12) The difference in color of the Chinese 100% white hair swatch before and after the above coloring procedure was measured by measuring the value of LAB (lightness/green-red/blue-yellow) with using Konica Minolta Spectrophotometer CM-3600A. 6 points of the hair swatch were evaluated in total. ΔE* (between the color of the uncolored original swatch and the color of the colored swatch under ΔL*a*b system) was calculated. The higher ΔE* is, the better the color intensity is.

(13) (Color Lastingness)

(14) The colored Chinese 100% white hair swatch was shampooed for 28 times. The difference in color of the colored Chinese 100% white hair swatch before and after shampooing for 28 times was measured by measuring the value of LAB (lightness/green-red/blue-yellow) with using Konica Minolta Spectrophotometer CM-3600A. 6 points of the hair swatch were evaluated in total. ΔE* (between the color of the colored swatch and the color of the shampooed swatch under ΔL*a*b system) was calculated. The smaller ΔE* is, the better the color lastingness is.

(15) (Curling Efficacy)

(16) The number of curls were counted for the colored Japanese natural hair swatch before and after drying the swatch.

(17) The results are shown in Table 1.

(18) As shown in Table 1, the process comprising an application of a composition including a combination of taurine, sodium hydroxide, and ethanol amine onto hair and heating the hair produced superior color intensity and color lastingness to the comparative process where the composition does not include the combination and the heating step is absent. In addition, the process according to the present invention also could significantly improve curling efficacy, which leads to superior reshaping or deforming efficacy of the keratin fibers.