Lightening process using a substrate bearing at least one oxidizing agent and an aqueous composition

Abstract

The present invention relates to the field of lightening keratin fibres and more particularly to the field of lightening the hair. The present invention relates to a process for lightening keratin fibres, in particular human keratin fibres such as the hair, which consists in using on the said fibres i) a substrate comprising on its surface one or more chemical oxidizing agents preferably in solid form, and ii) an aqueous composition preferably comprising one or more chemical oxidizing agents. The present invention also relates to a process for preparing the said substrate thus pretreated.

Claims

1. A process for lightening keratin fibers, the process comprising: i) applying to the keratin fibers a substrate comprising on a surface at least one first solid chemical oxidizing agent, the at least one first solid chemical oxidizing agent being deposited onto the surface of the substrate by printing, and ii) applying to the keratin fibers an aqueous composition comprising at least one second chemical oxidizing agent and at least one alkaline agent; wherein the substrate is applied first to the keratin fibers, and then the aqueous composition is applied to the keratin fibers; or the aqueous composition is applied first to the keratin fibers, and then the substrate is applied to the keratin fibers.

2. The process according to claim 1, wherein the substrate is an element in sheet form.

3. The process according to claim 2, wherein the element in sheet form comprises a material chosen from plastic, thermoplastic, paper, metal, aluminum, woven or nonwoven non-absorbent fibers, cellulose or derivatives thereof, or polyamide 6,6.

4. The process according to claim 2, wherein the element in sheet form comprises an adhesive layer comprising at least one first chemical oxidizing agent on a surface thereof.

5. The process according to claim 1, wherein the at least one first solid chemical oxidizing agent is chosen from urea peroxide; alkali metal bromates or ferricyanides; peroxygenated salts; or alkali metal or alkaline-earth metal persulfates, perborates, or percarbonates.

6. The process according to claim 1, wherein the at least one first solid chemical oxidizing agent is chosen from peroxygenated salts or persulfates.

7. The process according to claim 1, wherein the at least one first solid chemical oxidizing agent is present on at least a part of the surface of the substrate and represents patterns having a desired form.

8. The process according to claim 1, wherein the substrate comprises on a face opposite the surface bearing the at least one first solid chemical oxidizing agent a copy of a desired pattern.

9. The process according to claim 1, wherein the surface of the substrate comprises, prior to the deposition of the at least one first solid chemical oxidizing agent, at least one pattern.

10. The process according to claim 1, wherein the substrate is transparent.

11. The process according to claim 1, wherein the substrate further comprises on the surface at least one alkaline agent.

12. The process according to claim 1, wherein the aqueous composition comprises at least one second chemical oxidizing agent chosen from hydrogen peroxide or peroxygenated salts.

13. The process according to claim 1, further comprising preparing the substrate by depositing, via a printing method, a composition comprising at least one first solid chemical oxidizing agent onto the surface of the substrate.

14. The process according to claim 13, wherein the printing method is a screen printing process, a flexography process, an offset printing process, or a printing process using an inkjet printer or a laser printer.

Description

EXAMPLE

(1) 1. Preparation of the Substrate

(2) A sheet of aluminium foil (30 cm10 cm) is used, on which is placed a strip of adhesive tape about 5 cm long. The foil is sprinkled with a mixture of peroxygenated salts/alkaline agent (mixture of sodium persulfate (10) and potassium persulfate (40)/sodium metasilicate (2.5)), and is then shaken to remove the non-bound powder.

(3) The amount of powder deposited is about 5 mg/cm.sup.2 at the place where the adhesive tape is on the sheet of foil.

(4) 2. Procedure

(5) An alkaline oxidizing aqueous composition is prepared from a weight-for-weight mixture, at the time of use, of a composition sold under the name Oxydant Riche INOA 30 volumes (based on aqueous hydrogen peroxide solution) and of an alkaline composition based on 10% by weight of monoethanolamine.

(6) A lock of a model's chestnut-brown hair is isolated using the technique of plaiting. The hair is then placed on the aluminium foil and is then pasted by applying with a brush the oxidizing aqueous composition, in an amount of 3 g, along the entire length of the lock of the hair. The edges of the foil are folded over to enclose the lock.

(7) The composition is left to act on the lock for 50 minutes, and the lock is then removed and rinsed thoroughly. The lock of hair is washed with a shampoo and then dried.

(8) The production of a bleached pattern is very clearly observed.

(9) 3. Preparation of the Substrate with an Inkjet Printer

(10) A Gatocopy printer is used. One of the cartridges is filled with a freshly prepared formula containing:

(11) 10 g of sodium persulfate

(12) 40 g of potassium persulfate

(13) 5 g of sodium metasilicate

(14) water qs 100 g

(15) A 5 cm5 cm rectangle is printed on a sheet of office paper.

(16) Eight prints are produced, taking care for the positioning of the sheet to allow the rectangle to be superposed on the same area.

(17) The amount of product deposited is about 3 mg/cm.sup.2.

(18) The test as described above is then repeated.