Assembly containing at least one dyeing substrate and at least one substrate comprising one or more preservatives, dispensing means, and dyeing process

Abstract

Assembly containing at least one dyeing substrate and at least one protective substrate comprising one or more preservatives, dispensing means, and dyeing process The present invention relates to the field of dyeing keratin fibres and more particularly to the field of hair dyeing. The present invention relates to an assembly 2 containing at least one dyeing substrate 3, and at least one protective substrate 4a, 4b comprising one or more preservatives, and it being understood that the dyeing substrate(s) 3 are different from the protective substrate(s) 4a, 4b. The present invention also relates to a means for dispensing 1 the assembly 2, and also to a process for dyeing keratin fibres using said assembly 2.

Claims

1. Assembly containing: at least one substrate for dyeing keratin fibres, comprising a surface coated with at least one layer constituted of a dye composition comprising one or more oxidation dyes; and at least one protective substrate, comprising a surface coated with at least one layer constituted of a composition comprising one or more preservatives; it being understood that said dyeing substrate(s) are different from said protective substrate(s).

2. Assembly according to claim 1, characterized in that the dyeing substrate is in contact with at least one protective substrate.

3. Assembly according to claim 2, characterized in that the dyeing substrate is included between two protective substrates.

4. Assembly according to claim 1, characterized in that a protective substrate partially or totally envelops the dyeing substrate.

5. Assembly according to claim 1, characterized in that the dyeing substrate(s) are elements in sheet form.

6. Assembly according to claim 5, characterized in that the element in sheet form is made of plastic, paper, metal, a woven, a nonwoven of non-absorbent fibres, or polyamide 6,6.

7. Assembly according to claim 5, characterized in that the element in sheet form comprises an adhesive layer on which is (are) deposited the oxidation dye(s).

8. Assembly according to claim 1, characterized in that the oxidation dye(s) are chosen from oxidation bases and optionally couplers.

9. Assembly according to claim 8, characterized in that the oxidation bases are chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols and heterocyclic bases, the addition salts thereof and mixtures thereof.

10. Assembly according to claim 8, characterized in that the couplers are chosen from meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, the addition salts thereof and mixtures thereof.

11. Assembly according to claim 1, characterized in that the preservative(s) are chosen from sulfites, bisulfites, sulfinates, sugars, hydrides, thiolated sulfur-bearing reducing agents, organic reducing agents of reductone type, agents capable of slowing down the oxidative condensation reaction, and mixtures thereof.

12. Assembly according to claim 1, characterized in that the preservative(s) are chosen from ammonium sulfites and bisulfites, alkali metal or alkaline-earth metal sulfites and bisulfites, reductic acid, ascorbic acid, erythorbic or isoascorbic acid, thioglycolic acid, thiolactic acid, cysteine, cysteamine, ethylenediaminotetraacetic acid (EDTA), citric acid, and mixtures thereof.

13. Assembly according to claim 1, characterized in that the preservative(s) are present in a total amount ranging from 0.1% to 60% by weight, relative to the total weight of the composition comprising the preservative(s).

14. Means for dispensing the assembly as defined in claim 1, comprising a means for cutting said assembly.

15. Means for dispensing the assembly as defined in claim 1 comprising a means for separating the two protective substrates from the dyeing substrate, and a means for cutting said dyeing substrate.

16. Process for the oxidation dyeing of keratin fibres, using an assembly according to claim 1, the process comprising: i) a step consisting in removing said protective substrate(s) from the assembly; ii) a step of applying, to said fibres, the dyeing substrate(s); and iii) a step of applying, to said fibres, an oxidizing aqueous composition comprising one or more chemical oxidizing agents.

Description

EXAMPLES

(1) Dye compositions C1 land C2 for treating the surface of the dyeing substrate according to the invention are prepared from the ingredients shown in the table below, the amounts of which are expressed as weight percentages of active material (AM).

(2) TABLE-US-00001 Composition Composition Ingredients C1 C2 2,5-Toluenediamine 4 4-(2-Hydroxyethoxy)-1,3- 7.9 phenylenediamine dihydrochloride (C14/C16) Alkyl 1 hydroxyethylcellulose Erythorbic acid — 0.3 Thiolactic acid — 0.4 Water qs 100 qs 100

(3) A composition P1 of preservatives for treating the surface of the protective substrates according to the invention is also prepared from the ingredients shown in the table below, the amounts of which are expressed as weight percentages of active material (AM).

(4) TABLE-US-00002 Ingredients Composition P1 Sodium bisulfite 10 Water qs 100

(5) Preparation of the Dyeing Substrates SC1:

(6) 840 mg of composition C1 are applied uniformly using a HandCoater (sold by RK PrintCoat Instruments Ltd., K-HandCoater range, under the reference “yellow”) on a 20×10 cm dyeing substrate of parchment paper type. The deposit of dye composition C1 is thus 4.2 mg/cm.sup.2 before drying.

(7) The dyeing substrate SC1 is then dried.

(8) Preparation of the Dyeing Substrates SC2:

(9) The dyeing substrate SC2 is prepared in the same way as SC1, but with 840 mg of composition C2 instead of 840 mg of composition C1.

(10) Preparation of the Protective Substrate SPi According to the Invention:

(11) 840 mg of composition P1 are applied uniformly using a HandCoater (sold by RK PrintCoat Instruments Ltd., K-HandCoater range, under the reference “yellow”) on a 20×10 cm protective substrate of white stationery paper type. The deposit of the composition is thus 4.2 mg/cm.sup.2 before drying.

(12) The protective substrate SPi is then dried, and 840 mg of composition P1 are again applied uniformly using a HandCoater on the back side of the protective substrate.

(13) Preparation of the Oxidizing Composition:

(14) The oxidizing composition is a L'Oréal “2” 30 V Oxidizing Creme, equivalent to 9 volumes of hydrogen peroxide.

Example 1

(15) An assembly A1 (invention) which comprises a dyeing substrate SC1 and two protective substrates SPi is prepared, the two protective substrates SPi being in direct contact with SC1 and placed on either side of SC1. In other words, the assembly A1 is a superposition of the dyeing substrate SC1 and of the two protective substrates SPi, where the dyeing substrate SC1 is between the two protective layers.

(16) An assembly A2 (invention) which comprises a dyeing substrate SC1 and a protective substrate SPi is prepared, the protective substrate SPi being directly in contact with SC1 and covering SC on the surface treated with the composition C1.

(17) An assembly A3 (outside the invention), which comprises a dyeing substrate SC1, without protective substrate, is prepared.

(18) The three assemblies A1, A2 and A3 are then bagged, independently of one another. The three bags are then placed under vacuum and, finally, placed under an inert atmosphere by filling with argon.

(19) The bags are then stored at atmospheric pressure and ambient temperature for 4 weeks.

(20) The three bags are then opened and the assemblies A1, A2 and A3 are used according to the following dyeing process: 1) for A1 and A2, the protective substrate(s) SPi are removed from the assembly, then 2) 1.5 g of grey hair containing 90% white hairs are deposited on the dyeing substrate SC1, then 3) the oxidizing composition is applied to the lock of hair deposited on SC1, then 4) the lock is left to stand for 30 minutes and, finally 5) the lock is rinsed, washed with a shampoo and rinsed with water.

(21) After drying the locks of hair, an intense blue colour judged to be satisfactory is observed for the locks of hair treated with the assembly A1 or the assembly A2.

(22) A pale blue colour judged to be unsatisfactory is also observed for the lock of hair treated with the assembly A3.

Example 2

(23) An assembly A4 (invention) which comprises a dyeing substrate SC2 and two protective substrates SPi is prepared, the two protective substrates SPi being in direct contact with SC2 and placed on either side of SC2. In other words, the assembly A4 is a superposition of the dyeing substrate SC2 and of the two protective substrates SPi, where the dyeing substrate SC2 is between the two protective layers.

(24) An assembly A5 (invention) which comprises a dyeing substrate SC2 and a protective substrate SPi is prepared, the protective substrate SPi being directly in contact with SC2 and covering SC2 on the surface treated with the composition C2.

(25) An assembly A6 (outside the invention), which comprises a dyeing substrate SC2, without protective substrate, is prepared.

(26) 10 assemblies A4 are then bagged together, as are, in the same way, 10 assemblies A5 and 10 assemblies A6. The three bags are then placed under vacuum and, finally, placed under an inert atmosphere by filling with argon and sealed by thermal welding.

(27) The bags are then stored at atmospheric pressure and ambient temperature for 4 weeks.

(28) The three bags are then opened and 5 assemblies, from each bag, are used according to the following dyeing process: 1) for A4 and A5, the protective substrate(s) SPi are removed from the assembly, then 2) 1.5 g of grey hair containing 90% white hairs are deposited on the dyeing substrate SC2, then 3) the oxidizing composition is applied to the lock of hair deposited on SC2, then 4) the lock is left to stand for 30 minutes and, finally 5) the lock is rinsed, washed with a shampoo and rinsed with water.

(29) After drying the locks of hair, an intense blue colour judged to be satisfactory is observed for the locks of hair treated with the assembly A4 or the assembly A5.

(30) A pale blue colour judged to be unsatisfactory is also observed for the lock of hair treated with the assembly A6.

(31) Three days after opening the bags, the 5 other assemblies from each bag are used according to the same dyeing process.

(32) After drying the locks of hair, an intense blue colour judged to be satisfactory is observed for the locks of hair treated with the assembly A4 or the assembly A5.

(33) A pale blue colour judged to be unsatisfactory is also observed for the lock of hair treated with the assembly A6.

Example 3

(34) An assembly A5 (invention) as prepared in Example 1 above, is prepared.

(35) An assembly A7 (outside the invention) which comprises a dyeing substrate SC2 and a comparative protective substrate SPc is prepared, the comparative protective substrate SPc being directly in contact with SC2 and covering SC2 on the surface treated with the composition C2.

(36) The comparative protective substrate SPc corresponds to a simple 20×10 cm sheet of white stationery paper type. In other words, the comparative protective substrate SPc corresponds to the protective substrate SPi according to the invention as described above without the deposit on its surface of the composition P1.

(37) Each assembly A5 and A7 is then bagged, independently of one another, just after their preparation.

(38) The two bags are then placed under vacuum and, finally, placed under an inert atmosphere by filling with argon and sealed by thermal welding.

(39) The two bags are then stored at atmospheric pressure and ambient temperature for 4 weeks.

(40) After 4 weeks, the two bags are then opened and each assembly is used according to the following dyeing process: 1) the protective substrate SPi are removed from the assembly A5 and the protective substrate SPc are removed from the assembly A7, then 2) 1.5 g of grey hair containing 90% white hairs are deposited on the dyeing substrate SC2, then 3) the oxidizing composition is applied to the lock of hair deposited on SC2, then 4) the lock is left to stand for 30 minutes and, finally 5) the lock is rinsed, washed with a shampoo and rinsed with water.

(41) After drying the locks of hair, an intense blue colour judged to be satisfactory is observed for the locks of hair treated with the assembly A5 according to the invention.

(42) A pale blue colour judged to be unsatisfactory is also observed for the lock of hair treated with the comparative assembly A7 (outside the invention).

Example 4

(43) A dyeing substrate in paper sheet form is prepared by flexography, using the Anilox GTT28 cm.sup.3/cm.sup.2.

(44) The dyeing substrate is then dried by infrared at the printing outlet. The amount of ink deposited is approximately 1 mg of ink per cm.sup.2 of substrate per passage. The ink used containing approximately 12% of oxidation dyes, i.e. 0.12 mg of oxidation dyes deposited per cm.sup.2 of substrate per passage.

(45) The substrate flow rate is 10 metres per minute.

Example 5

(46) One particular embodiment of a dispensing means according to the invention is represented according to the appended FIG. 1.

(47) FIG. 1 represents a sectional view of a dispensing means according to the invention in accordance with one particular embodiment.

(48) FIG. 1 represents a means for dispensing 1 the assembly 2 comprising a dyeing substrate 3 placed between two protective substrates 4a and 4b and in contact with said substrates. In other words, the dyeing substrate 3 is sandwiched between the two protective substrates 4a and 4b.

(49) The dispensing means 1 comprises a rotary feed drum 5 which has a substantially circular profile and on which the assembly 2 is wound. The assembly 2 can be directly in contact with the rotary feed drum 5. In particular, the assembly 2 is held in a groove 5a of the drum 5.

(50) The dispensing means 1 also comprises a separating means 6 intended to detach the protective substrates 4a and 4b from the dyeing substrate 3, and a cutting means 7, preferably a serrated blade.

(51) The dispensing means 1 is mounted on a support 8.

(52) According to FIG. 1, the means for separating the two protective substrates from the dyeing substrate is constituted of two auxiliary rotary drums 6a and 6b placed one above the other along a vertical axis, such that, when the assembly 2 unwinds from the rotary feed drum 5, the assembly 2 passes between the two auxiliary drums 6a and 6b, the axes of rotation of which are parallel to the axis of rotation of the rotary feed drum.

(53) According to FIG. 1, the two protective substrates, as defined previously, are attached to the auxiliary drums 6a and 6b by the user, and thus, when the rotary feed drum 5 is rotated such that the assembly 2 partially unwinds from the feed drum 5, the user can then grasp the dyeing substrate 3, optionally covered with a layer, termed “polymer” layer, as described previously, and can cut said substrate using the cutting means 7, preferably a serrated blade, along an axis parallel to the axis of rotation of the rotary feed drum 5, to the desired length.

(54) FIG. 1 thus represents in particular a means for dispensing 1 the assembly 2 as described previously, comprising a means for separating 6 the two protective substrates 4a, 4b from the dyeing substrate 3, and a means for cutting 7 said dyeing substrate 3.

(55) The dyeing substrate can then be applied to the keratin fibres for the time required for the dyeing.

(56) An oxidizing aqueous composition as described previously can then be applied, in turn, to the keratin fibres in order to obtain the hair colouring desired by the user.