METHODS, COMPOSITIONS AND USES RELATING THERETO

Abstract

A method of combatting colour loss from a dyed material, the method comprising contacting the material with a composition comprising a polycarboxylic acid derived chelating agent.

Claims

1. A method of combatting colour loss from a dyed material, the method comprising contacting the material with a composition comprising a polycarboxylic acid derived chelating agent.

2. The method according to claim 1 wherein the material is a keratinous material.

3. The method according to claim 1 wherein the material is human hair or animal hair.

4. The method according to claim 3 wherein the material is growing human hair or animal hair.

5. The method according to claim 1 which is carried out on a material that has been dyed.

6. The method according to claim 1 wherein the composition contacted with the hair comprises two or more polycarboxylic acid derived chelating agents.

7. The method according to claim 1 wherein the composition comprising a polycarboxylic acid derived chelating agent is selected from a shampoo composition, a conditioning composition, a hair styling composition, a hair permanent waving composition, a hair relaxing composition, a hair permanent straightening composition or a hair colouring composition.

8. The method according to claim 1 wherein the composition comprising the polycarboxylic acid derived chelating agent further comprises 1 to 30 wt % of one or more surfactants.

9. A method of colouring hair, the method comprising: (a) contacting the hair with a colouring composition; and (b) contacting the hair with a composition comprising a polycarboxylic acid derived chelating agent.

10. (canceled)

11. The method according to claim 1 wherein the chelating agent is selected from the group consisting of glutamic acid N,N-diacetic acid (GLDA), diethylene triamine pentaacetic acid (DTPA), imido disuccinic acid (IDS), L-aspartic acid diacetic acid (ASDA), ethylene diamine tetraacetic acid (EDTA), ethylene diamine disuccinic acid (EDDS), hydroxyethyl ethylenediaminetriacetic acid (HEDTA), citric acid and mixtures thereof.

12. The method according to claim 1 wherein the chelating agent is selected from the group consisting of GLDA, DTPA, IDS and mixtures thereof.

13. The method according to claim 1 wherein the chelating agent is selected from the group consisting of GLDA, DTPA and mixtures thereof.

14. The method according to claim 1 wherein the composition comprising the polycarboxylic acid derived chelating agent further comprises an aldehyde which is an alpha-substituted aldehyde and/or a hydroxy aldehyde.

15. The method according to claim 1 wherein the composition comprising the polycarboxylic acid derived chelating agent further comprises a succinimidyl ester.

16. The method according to claim 1 wherein the composition comprising the polycarboxylic acid derived chelating agent further comprises an amine salt of a carboxylic acid.

17. The method according to claim 1 wherein the composition comprising the polycarboxylic acid derived chelating agent further comprises a crosslinking agent comprising two or more maleic acid derived reactive moieties and a linker having two or more amino groups.

18. The method according to claim 9 wherein steps (a) and (b) are carried out simultaneously and the method involves contacting the hair with a colouring composition comprising a polycarboxylic acid derived chelating agent.

19. The method according to claim 9 wherein step (b) is carried out before step (a).

20. The method according to claim 9 wherein step (b) is carried out after step (a).

21. The method according to claim 9 which provides a significant reduction in colour loss after 1 to 3 washes such that the colour is visibly more intense compared with hair treated by an equivalent method excluding the chelating agent.

22. The method according to claim 9 which provides a reduction in colour loss of at least 10% after three washes compared with hair treated by an equivalent method excluding the chelating agent.

23.-24. (canceled)

25. The method according to claim 1 which reduces colour loss by at least 20%.

26. A packaged hair colouring product comprising one or more compositions wherein the one or more compositions together comprise at least one dye compound and/or one dye precursor compound and a polycarboxylic acid chelating agents.

27. The method according to claim 1 wherein the dyed material is a textile material.

28. The method according to claim 1 which combats colour loss resulting from washing a dyed textile material in a laundry washing process.

Description

EXAMPLE 1

[0190] Wool swatches were dyed with an oxidative red dye formed as follows:

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[0191] The dyed swatches were immersed in an aqueous solution comprising 10 wt % of the test chelating agents listed in table 1 and 0.1 wt % SLES buffered to pH 5.5 with sodium acetate buffer for 30 minutes at 40 C. The swatches were then rinsed in water for 2 minutes and then dried. A 30-minute treatment represents a relatively severe test, equivalent to multiple regular washes.

[0192] A visual assessment was made of the cloth and this was rated on a scale of 1-5, as follows: [0193] 1 Colour significantly more intense than control and close to original colour [0194] 2 Colour visibly more intense than control [0195] 3 Colour not visibly more intense than control [0196] 4 Colour visibly less intense than control [0197] 5 Colour significantly less intense than control or colour hue change (eg, blue) or cloth greasy or spotted (reasons recorded)

[0198] For cloths visually assessed as more intense than the control (Score 1 or 2), then the actual reading of the colour intensity was measured using standard reflectometry and compared with a deionised water control (containing 0.1 wt % SLES). 100% is the amount of dye removed by the control and a number <100% shows less dye removal than the control and 0% is the colour of the original cloth. In this case the difference in reflectance of light having a wavelength of 457 nm was measured.

[0199] Table 1 details the compounds tested and the results obtained.

TABLE-US-00001 TABLE 1 Chelating agent Score Result Colour loss relative to control DTPA 1 0.4 6% GLDA 1 1.3 20% IDS 2 2.3 36% EDTA 2 3.4 53% EDDS 2 3.7 58% HEDTA 2 3.7 58% HEDP (comparative) 3 5.8 91% Deionised water Control 3 6.4 100%

EXAMPLE 2

[0200] The wash fastness of the dyeings according to the invention was assessed according to the following method.

[0201] Wool swatch samples were initially treated as in example 1. They were then treated with a deionized water composition comprising 0.1% SLES for wetting for 15 minutes, rinsed and dried. The reflectance at 457 nm (R457) was measured. A further two washing steps with deionized water comprising 0.1% SLES were carried out for 15 minutes each.

[0202] The results in table 2 are the absolute values of R457 wherein R457 is the difference in reflectance at 457 nm between the initially dyed wool swatches and the swatches that have been treated as detailed in the table.

TABLE-US-00002 TABLE 2 30 min Wash Wash % colour treatment Wash 30 45 loss Compo- with 15 min min compared sition Chelant chelant min (total) (total) to control 1 DTPA 0.9 1.9 3.5 5.4 29 2 GLDA 1.2 2.5 3.3 4.9 27 3 IDS 2.5 5.8 9.6 13.3 72 4 EDDS 3.4 6.1 8.7 12.8 70 5 Citric Acid 4.2 7.3 9.7 13.5 73 6 0.1% SLES 6.4 9.3 13.8 18.4 100 (control)

[0203] The results in table 2 clearly show that the present invention provides a benefit in terms of reducing subsequent leaching of dye relative to the control.

EXAMPLE 3

[0204] The effect of multiple treatments with chelating agent was carried out by repeatedly contacting the wool swatches with a chelating agent for periods of 30 or 15 minutes as generally described in example 1. After each treatment the swatches were then rinsed in water for 2 minutes and then dried.

[0205] The results in table 3 are the absolute values of R457 wherein R457 is the difference in reflectance at 457 nm between the initially dyed wool swatches and the swatches that have been treated as detailed in the table.

TABLE-US-00003 TABLE 3 Initial 30 min treatment 15 min 15 min 15 min GLDA 10% 0.5 0.6 0.2 0.2 DTPA 10% 0.1 0.2 0.1 0.6 IDS 10% 2.4 3.0 4.4 5.4 EDDS 10% 2.9 3.4 4.7 6.5 DIW Control (0.1% SLES) 5.2 8.1 12.9 16.9

EXAMPLE 4

[0206] A study of the use of shampoo compositions comprising GLDA to achieve wash fastness was carried out according to the following method.

[0207] Wool swatch samples were treated as in example 2 using 5 wt % solutions of GLDA or deionised water control and 10% of a basic shampoo formula (12.5 wt % SLES, 2.5 wt % CAPB in water). The results in Table 4 are the absolute values of R457 wherein R457 is the difference in reflectance at 457 nm between the initially dyed wool swatches and the swatches that have been treated with the inventive composition or the control.

TABLE-US-00004 TABLE 4 Composition R457 Shampoo + GLDA 1.9 Shampoo control 7.8