Process for dyeing keratinous fibres with 5,6-dihydroxy-indole combined with an iodide and dyeing composition employed

Claim 2

A plural stage process for dyeing keratinous fibers comprising applying to said keratinous fibers in an amount effective to dye said keratinous fibers a composition (A) comprising, in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent and iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed as I - ions relative to the total weight of said composition (A), the application of said composition (A) being preceded or followed by the application of composition (B) comprising, in a medium suitable for dyeing keratinous fibers, hydrogen peroxide at a concentration ranging from 1 to 40 volumes at a pH ranging from 2 to 7.

Claim 3

The process of claim 1 wherein said composition (B) has a pH ranging from 2 to 5.

Claim 4

The process of claim 1 wherein said 5,6-dihydroxyindole is present in an amount ranging from 0.03 to 3 weight percent.

Claim 5

The process of claim 1 wherein said iodide ions are present in an amount ranging from 0.008 to 2.5 weight percent.

Claim 6

The process of claim 1 wherein said hydrogen peroxide is present at a concentration ranging from 2 to 20 volumes.

Claim 7

The process of claim 1 wherein the source of said iodide ions is selected from the group consisting of an alkali metal iodide, an alkaline earth metal iodide and an ammonium iodide.

Claim 8

The process of claim 1 wherein said composition (A) is applied to said keratinous fibers in a first stage, said iodide ions being in the form of an iodide selected from the group consisting of an alkali metal iodide, an alkaline earth metal iodide and an ammonium iodide and said composition (B) is applied to said keratinous fibers in a second stage.

Claim 9

The process of claim 1 wherein the application of said compositions (A) and (B) is separated by a rinsing stage.

Claim 10

The process of claim 1 which is carried out without a rinsing stage between the application of compositions (A) and (B).

Claim 11

The process of claim 1 wherein the weight ratio between said 5,6-dihydroxyindole and said iodide ions in composition (A) ranges from 0.05 to 10.

Claim 12

The process of claim 10 wherein the weight ratio between said 5,6-dihydroxyindole and said iodide ions in composition (A) ranges from 0.5 to 2.

Claim 13

The process of claim 1 wherein compositions (A) and (B) are applied to said keratinous fibers with an exposure time ranging from 10 seconds to 45 minutes.

Claim 14

The process of claim 12 wherein the pH of composition (A) ranges from 2 to 7.

Claim 15

The process of claim 12 wherein the pH of composition (A) ranges from 3.5 to 7.

Claim 16

The process of claim 12 wherein said exposure time ranges from 2 to 20 minutes.

Claim 17

The process of claim 1 wherein said medium suitable for dyeing keratinous fibers is water or a water-organic solvent mixture.

Claim 18

The process of claim 16 wherein said organic solvent is selected from the group consisting of ethyl alcohol, propyl alcohol, isopropyl alcohol, tert.butyl alcohol, ethylene glycol, the monomethyl ether of ethylene glycol, the monoethyl ether of ethylene glycol, the monobutyl ether of ethylene glycol, ethylene glycol monoethyl ether acetate, propylene glycol, monomethyl ether of propylene glycol, monomethyl ether of dipropylene glycol and methyl lactate.

Claim 19

The process of claim 1 wherein compositions (A) and (B) contain at least one adjuvant selected from (a) a fatty amide present in an amount ranging from 0.05 to 10 weight percent, (b) an anionic, cationic, nonionic or amphoteric surfactant, or a mixture thereof, present in an amount ranging from 0.1 to 50 weight percent, (c) a thickening agent present in an amount ranging from 0.1 to 5 weight percent and selected from the group consisting of sodium alginate, gum arabic, guar gum, xanthan gum, a scleroglucan, methyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, sodium salt of carboxymethyl cellulose, acrylic acid polymer and bentonite, (d) a perfume, (e) a sequesterant, (f) a film forming agent, (g) a dispersant, (h) a conditioner, (i) a preservative, (j) an opacifier and (k) a swelling agent.

Claim 20

The process of claim 1 wherein said keratinous fibers are human hair.

Claim 21

A keratinous fiber dyeing composition comprising, in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent and iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed in I - ions relative to the total weight of said composition.

Claim 22

A keratinous fiber dyeing composition comprising, in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent and iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed in I - ions relative to the total weight of said composition.

Claim 23

The composition of claim 20 wherein said 5,6-dihydroxyindole is present in an amount ranging from 0.03 to 3 weight percent.

Claim 24

The composition of claim 20 wherein said iodide ions are present in an amount ranging from 0.008 to 2.5 weight percent.

Claim 25

The composition of claim 20 wherein said iodide ions are in the form of an iodide selected from the group consisting of an alkalimetal iodide, an alkaline earth metal iodide and an ammonium iodide.

Claim 26

The composition of claim 20 wherein said medium is an aqueous medium and said composition has a pH ranging from 2 to 7.

Claim 27

The composition of claim 24 having a pH ranging from 3.5 to 7.

Claim 28

The composition of claim 20 wherein said medium is an anhydrous solvent medium.

Claim 29

A kit for dyeing keratinous fibers containing at least two compartments, one of said compartments containing a composition comprising in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent and iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed as I - ions relative to the total weight of said composition, and another of said compartments containing an aqueous composition of hydrogen peroxide present at a concentration of 1 to 40 volumes, said aqueous composition having a pH ranging from 2 to 7.

Claim 30

A kit for dyeing keratinous fibers containing at least two compartments, one of said compartments containing a composition comprising in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent and iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed as I - ions relative to the total weight of said composition, and another of said compartments containing an aqueous composition of hydrogen peroxide present at a concentration of 1 to 40 volumes, said aqueous composition having a pH ranging from 2 to 7.

Claim 31

The kit of claim 27 wherein the medium suitable for dyeing keratinous fibers present in said one compartment is an aqueous medium and has a pH ranging from 2 to 7.

Claim 32

A kit for dyeing keratinous fibers containing at least three compartments, a first of said compartments containing a composition comprising in a medium suitable for dyeing keratinous fibers iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed as I - ions, a second of said compartments containing a composition comprising, in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent, and a third of said compartments containing an aqueous composition of hydrogen peroxide present at a concentration of 1 to 40 volumes, said aqueous composition having a pH ranging from 2 to 7.

Claim 33

A kit for dyeing keratinous fibers containing at least three compartments, a first of said compartments containing a composition comprising in a medium suitable for dyeing keratinous fibers iodide ions present in an amount ranging from 0.007 to 4 weight percent expressed as I - ions, a second of said compartments containing a composition comprising, in a medium suitable for dyeing keratinous fibers, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 weight percent, and a third of said compartments containing an aqueous composition of hydrogen peroxide present at a concentration of 1 to 40 volumes, said aqueous composition having a pH ranging from 2 to 7.

Claim 34

The kit of claim 29 wherein the medium suitable for dyeing keratinous fibers in each of said first and second of said compartments is an aqueous medium, the aqueous medium in said first of said compartments having a pH ranging from 2 to 11 and the aqueous medium in said second of said compartments having a pH ranging from 2 to 7.