REDUCING COLOUR LOSS FROM A DYED MATERIAL BY USING AN AMINE SALT OF A CARBOXYLIC ACID

Abstract

A method of combatting colour loss from a dyed material, the method comprising contacting the material with a composition comprising an amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

Claims

1. A method of combatting colour loss from a dyed material, the method comprising contacting the material with a composition comprising an amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

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.-6. (canceled)

7. The method according to claim 1 wherein the composition comprising the amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms is selected from the group consisting of a shampoo composition, a conditioning composition, a hair styling composition, a hair permanent waving composition, a hair relaxing composition, a hair permanent straightening composition and a hair colouring composition.

8. The method according to claim 1 wherein the composition comprising the amine salt 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 an amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

10. The method according to claim 1 wherein the acid has 6 to 8 carbon atoms.

11. The method according to claim 1 wherein the salt is a salt of n-hexanoic acid or n-octanoic acid.

12. The method according to claim 1 wherein the salt is of a secondary or tertiary alkylamine and/or alkanolamine or a substituted alkylene diamine.

13. The method according to claim 1 wherein the salt is selected from the group consisting of triethanolamine salt of hexanoic acid, diethanolamine salt of hexanoic acid, diethanolamine salt of octanoic acid and triethanolamine salt of octanoic acid.

14. The method according to claim 1 wherein the composition comprising the amine salt further comprises an aldehyde which is an alpha-substituted aldehyde and/or a hydroxyaldehyde.

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

16. The method according to claim 1 wherein the composition comprising the amine salt further comprises a succinimidyl ester.

17. The method according to claim 1 wherein the composition comprising the amine salt 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 an amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

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 amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

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 amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms.

23.-24. (canceled)

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

26. (canceled)

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

[0184] Wool swatches were dyed with an oxidative red dye formed as follows:

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[0185] The dyed swatches were immersed in an aqueous solution comprising the test compounds listed in table 1 at 2 wt % (except compound 5) 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.

[0186] A visual assessment was made of the cloth and this was rated on a scale of 1-5, as follows: [0187] 1 Colour significantly more intense than control and close to original colour [0188] 2 Colour visibly more intense than control [0189] 3 Colour not visibly more intense than control [0190] 4 Colour visibly less intense than control [0191] 5 Colour significantly less intense than control or colour hue change (eg, blue) or cloth greasy or spotted (reasons recorded)

[0192] 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.

[0193] Table 1 details the compounds tested and the results obtained. Compounds 1 to 5 are of the invention. Compounds 6 to 9 are comparative examples.

TABLE-US-00001 TABLE 1 Compound Acid Amine Score Result 1 hexanoic acid diethanolamine 2 2 octanoic acid diethanolamine 2 16% 3 octanoic acid triethanolamine 2 43% 4 octanoic acid Bis tris 2 55% 5 octanoic acid N,N,N,N-Tetrakis(2- 1 20% hydroxyethyl)ethylenediamine 6 formic acid diethanolamine 3 7 acetic acid diethanolamine 3

EXAMPLE 2

[0194] The wash fastness of the dyeings according to the invention was assessed according to the following method.

[0195] Wool swatch samples were initially treated as in example 2. 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 30 minutes each.

[0196] 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 % colour 30 min Wash Wash loss treatment Wash 45 min 75 min compared Composition Salt with salt 15 min (total) (total) to control 1 diethanolamine salt 0.6 1.2 5.3 7.6 38 of octanoic acid 2 0.1% SLES 4.55 7.9 14.9 19.8 100 (control)

[0197] The results in table 2 and FIG. 1 clearly show that the present invention provides a benefit in terms of reducing subsequent leaching of dye relative to the control.

EXAMPLE 3

[0198] The effect of multiple treatments with an amine salt of a carboxylic acid wherein the carboxylic acid has 4 to 10 carbon atoms was carried out by repeatedly contacting wool swatches with the amine salt as generally described in example 1 for periods of 30 or 15 minutes. After each treatment the swatches were then rinsed in water for 2 minutes and then dried.

[0199] 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-00003 TABLE 3 Initial 30 minute treatment 15 minute 15 minute 15 minute Octanoic acid 1.2 2.2 3.1 3.8 diethanolamine salt 0.1% SLES 5.2 8.1 12.9 16.9 (control)

EXAMPLE 4

[0200] A study of the use of shampoo compositions comprising the triethanolamine salt of octanoic acid to achieve wash fastness was carried out according to the following method.

[0201] Wool swatch samples were treated as in example 2 using 3 wt % and 4 wt % solutions of the triethanolamine salt of octanoic acid 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 + 3 wt % octanoic acid 0.9 triethanolamine salt Shampoo + 4 wt % octanoic acid 2.0 triethanolamine salt Shampoo control 8.1