GB2557383A

GB2557383A - Hair treatments

Info

Publication number: GB2557383A
Application number: GB1711291.3A
Authority: GB
Inventors: Mama John; Malcolm Lewis David; Elizabeth Lucas Sarah
Original assignee: Perachem Ltd
Current assignee: Perachem Ltd
Priority date: 2016-07-19
Filing date: 2017-07-13
Publication date: 2018-06-20
Anticipated expiration: 2037-07-13
Also published as: WO2018015721A1; GB201612513D0; GB201711291D0; GB2557383B

Abstract

Claimed is an alkaline colour removal composition comprising: a) formamidine sulfinic acid (thiourea dioxide); b) an inert hydrophobic liquid; c) urea; and d) a sulfur containing nucleophile. Most preferably, the inert hydrophobic liquid is liquid paraffin. Most preferably, the sulfur containing nucleophile is thioglycolic acid. Preferably, the composition has a pH of 9 to 10. Also claimed is a kit of parts wherein components a) and b) form a first precursor and c) and d) form a second precursor. Further claimed is a method of removing color from dyed hair (i.e. a keratin fibre) wherein components A)-D) are mixed; the composition comprising A)-D) is contacted with the hair; subsequently, an oxidizing composition (e.g. hydrogen peroxide) is added to the hair. Inventive concept is the inclusion of paraffin liquid into a hair decolouring composition comprising formamidine sulphinic acid, urea and sulfur containing nucleophile.

Description

(54) Title of the Invention: Hair treatments

Abstract Title: Hair bleaching/decolouring composition comprising: formamidine sulfinic acid; inert hydrophobic liquid; urea; a sulfur containing nucleophile (57) Claimed is an alkaline colour removal composition comprising: a) formamidine sulfinic acid (thiourea dioxide); b) an inert hydrophobic liquid; c) urea; and d) a sulfur containing nucleophile. Most preferably, the inert hydrophobic liquid is liquid paraffin. Most preferably, the sulfur containing nucleophile is thioglycolic acid. Preferably, the composition has a pH of 9 to 10. Also claimed is a kit of parts wherein components a) and b) form a first precursor and c) and d) form a second precursor. Further claimed is a method of removing color from dyed hair (i.e. a keratin fibre) wherein components A)-D) are mixed; the composition comprising A)-D) is contacted with the hair; subsequently, an oxidizing composition (e.g. hydrogen peroxide) is added to the hair. Inventive concept is the inclusion of paraffin liquid into a hair decolouring composition comprising formamidine sulphinic acid, urea and sulfur containing nucleophile.

Mins

Figure 4

1811

1/4

Figure 1B

Figure 2

3/4

Mins mins

Mins

Figure 3

4/4

Mins

Mins

Mins

Figure 4

Hair treatments

The present invention relates to compositions and methods for the removal of colour from dyed materials, in particular for the removal of colour from dyed hair, especially human hair.

There are a number of existing compositions for removing colour from hair which has been dyed. However many of these are unsatisfactory. For example the compositions may cause damage to the hair; the chemicals used in some prior art compositions are hazardous to health; and in many cases the result achieved is incomplete or inconsistent. The time taken to achieve colour removal is also an important consideration.

It is an aim of the present invention to provide a colour removal composition which can be used to efficiently and safely remove colour from dyed hair with a high degree of reproducibility.

According to the first aspect of the present invention there is provided an alkaline colour removal composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile.

Component (a) comprises formamidine sulfinic acid. This compound has the following formula:

O

H₂N

OH

NH

It is believed that formamidine sulfinic acid hydrolyses to form the nucleophilic species HSO₂ (hydrosulfoxylate).

An advantage of using formamidine sulfinic acid is that, unlike other sources of hydrosulfoxylate, it does not produce formaldehyde during use.

It is known from the prior art to use aminomethanesulfinic acid for colour removal. Under the conditions of use this compound was not very effective. However for the avoidance of doubt, the compositions of the present invention do not comprise aminomethanesulfinic acid.

The composition of the present invention preferably comprises at least 0.1 wt% formamidine sulfinic acid, preferably at least 0.5 wt%, more preferably at least 1 wt%, preferably at least 1.5 wt%, preferably at least 2 wt%, suitably at least 2.5 wt%, for example at least 3 wt% or at least 4 wt%.

Suitably the composition comprises up to 30 wt% formamidine sulfinic acid, preferably up to 15 wt%, suitably up to 10 wt%, preferably up to 8 wt%, more preferably up to 7 wt%, for example up to 6 wt% or up to 5 wt%.

Component (b) is an inert hydrophobic liquid. Suitable components of this type include mixtures of hydrocarbons and silicone oils.

Preferably component (b) comprises paraffin liquid.

The composition of the present invention preferably comprises at least 0.1 wt% paraffin liquid, preferably at least 0.5 wt%, more preferably at least 1 wt%, preferably at least 1.5 wt%, preferably at least 2 wt%, suitably at least 2.5 wt%, for example at least 3 wt% or at least 4 wt%.

Suitably the composition comprises up to 30 wt% paraffin liquid, preferably up to 15 wt%, suitably up to 10 wt%, preferably up to 8 wt%, more preferably up to 7 wt%, for example up to 6 wt% or up to 5 wt%.

The weight ratio of component (a) to component (b) is preferably from 10:1 to 1:10, preferably from 5:1 to 1:5, more preferably from 2:1 to 1:2, for example about 1:1.

Component (c) comprises urea. The urea is preferably present in the composition of the present invention an amount of at least 0.1 wt%, suitably at least 1wt%, more preferably at least 2.5 wt%, suitably at least 5 wt%, preferably at least 10 wt%, more preferably at least 12.5%, for example at least 15 wt%.

The composition preferably comprises up to 50wt% urea, suitably up to 40wt%, more preferably up to 30wt%, suitably up to 25 wt%, for example up to 20wt%.

Component (d) comprises a sulfur-containing nucleophile. Suitably the sulfur containing nucleophile is not formamidine sulfinic acid and is present in addition to this.

Preferably the sulfur-containing nucleophile is selected from thiocyanate, sulfite salts (eg sodium sulfite), thioglycolic acid, thiocarbamate, carbamoylsulfinic acid, thioethanol, thiolactic acid, dihydrolipoate, thioglycerol, mercaptopropionic acid, cysteine, N-substituted cysteine, cysteamines, N-substituted cysteamines, thiosulfate, 1-thiopropane-3-sulfonate and mixtures and/or salts thereof.

In especially preferred embodiments component (d) comprises thioglycolic acid.

The sulfur-containing nucleophile is suitably present in the composition of the present invention in an amount of at least 0.1 wt%, preferably at least 0.25 wt%, more preferably at least 0.5 wt%, suitably at least 0.8 wt%, preferably at least 1 wt%.

The composition of the present invention suitably comprises up to 20 wt% of the sulfur containing nuclephile, preferably up to 10 wt%, more preferably up to 5 wt%, preferably up to 3 wt%, for example up to 2 wt%.

The composition of the present invention is preferably an aqueous composition. Suitably it comprises at least 30 wt% water, suitably at least 40 wt%, preferably at least 50 wt%, more preferably at least 55 wt%, for example at least 60 wt%.

The composition may comprise up to 95 wt% water, suitably up to 90 wt%, preferably up to 80 wt%, for example up to 70 wt%.

The composition of the present invention may further comprise one or more ingredients selected from surfactants, emulsifiers, colourants, fragrances, buffers, solvents, thickening agents and conditioning agents.

In some embodiments the composition further comprises one or more water miscible solvents, for example monohydric and polyhydric alcohols.

One especially preferred additional solvent is glycerol. Glyercol is suitably present in the composition in an amount of from 0.1 to 20 wt%, preferably 0.5 to 10 wt%, more preferably from 1 to 5 wt%, for example from 2 to 4 wt%.

The composition of the present invention is an alkaline composition. Suitably it has a pH of at least 7.5, preferably at least 8.

Suitably the composition of the present invention has a pH of from 8 to 11, preferably from 9 to 10.

The composition may include a buffer. Suitable pH buffers include 2-amino-2-methyl-1propanol. Other suitable buffers will be known to the person skilled in the art.

The buffer may suitably be present in an amount of from 0.1 to 5 wt%, for example from 1 to 3 wt%.

In some preferred embodiments the composition comprises one or more surfactants. Any suitable surfactant or mixture of surfactants may be included, for example anionic, cationic, amphoteric or nonionic surfactants. Suitable surfactants will be known to the person skilled in the art. Nonionic surfactants are especially preferred.

Suitable non-ionic surfactants will be known to the person skilled in the art. Preferred nonionic surfactants are alkoxyiated compounds, for example ethoxylated and polyethoxylated surfactants. One especially preferred non-ionic surfactant used herein is polysorbate 80.

The composition of the present invention suitably comprises from 0.1 to 20 wt% non-ionic surfactants, preferably from 0.5 to 10 wt%, more preferably from 1 to 5 wt%.

The composition may include a thickener. Suitable thickeners will be known to the person skilled in the art. Preferred thickeners are non-ionic thickeners. One suitable thickener is hydroxyethylcellulose.

Preferably the composition of the present invention comprises from 0.1 to 20 wt%, preferably from 0.25 to 10 wt%, more preferably from 0.5 to 2.5 wt% of thickeners.

The composition of the present invention may further comprise a quaternary ammonium compound. Suitable quaternary ammonium compounds are known to the person skilled in the art and include cetyl trimethyl ammonium chloride. This is suitably present in amount of from 0.01 to 0.5 wt% preferably from 0.1 to 0.25 wt%.

Suitably the colour removal composition of the present invention comprises:

(a) from 0.1 to 20 wt%, preferably from 1 to 10 wt% of formamidine sulfinic acid;

(b) from 0.1 to 20 wt%, preferably from 1 to 10 wt% of paraffin liquid;

(c) from 0.1 to 50 wt%, preferably from 10 to 20 wt% of urea; and (d) from 0.1 to 10 wt%, preferably from 0.5 to 3 wt% of thioglycolic acid.

In some embodiments the composition further comprises glycerol and polysorbate 80.

The composition of the present invention is suitably in the form of a gel, paste or viscous liquid. It suitably has a consistency of a shampoo or conditioning composition enabling it to be applied to and spread throughout the hair without running off.

The composition of the present invention may prepared shortly prior to use by admixture of two precursor compositions.

According to a second aspect of the present invention there is provided a colour removal kit comprising:

(i) a first precursor composition comprising:

(a) formamidine sulfinic acid; and (b) an inert hydrophobic liquid; and (ii) a second precursor composition comprising:

(c) urea; and (d) a sulfur containing nucleophile.

Suitably admixture of the first precursor composition and the second precursor composition provides a colour removal composition of the first aspect.

Preferred features of the second aspect are as defined in relation to the first aspect.

The first precursor composition comprises component (a) and component (b). Preferably component (a) and component (b) together comprise at least 50 wt% of the first precursor composition, preferably at least 70 wt%, more preferably at least 90 wt%, preferably least 95 wt%.

Preferably the first precursor composition consists essentially of component (a) and component (b).

Thus the first precursor composition suitably consists essentially of formamidine sulfinic acid and paraffin liquid.

These are suitably present in weight ratio of from 3:1 to 1:3, preferably about 1:1. The first precursor composition suitably has the appearance of a “wet” power.

The second precursor composition comprises urea and a sulfur containing nucleophile.

The sulfur containing nucleophile is suitably present in the second precursor composition in an amount of from 0.1 to 10 wt%, preferably 0.5 to 5 wt%, more preferably 1 to 2 wt%.

The second precursor composition preferably comprises 1 to 40 wt% urea, preferably 10 to 30 wt%, more preferably 15 to 25 wt%.

The second precursor composition is preferably an aqueous composition. Preferably it is the form of a gel or paste.

The second precursor composition preferably comprises from 50 to 95 wt% water, preferably 55 to 90 wt%, more preferably from 60 to 80 wt%.

The second precursor composition preferably further comprises glycerol, in an amount of from 0.1 to 10 wt% preferably from 1 to 5 wt%.

The second precursor composition preferably further comprises a non-ionic surfactant, for example polysorbate 80, preferably in an amount of from 0.1 to 10 wt%, suitably 1 to 5 wt%.

The second precursor composition may further comprise a quaternary ammonium salt, a thickener and a fragrance.

Preferably admixture of the first precursor composition and the second precursor composition provides a substantially homogeneous composition.

Preferably the first precursor composition and the second precursor composition are mixed in a ratio (by weight) of from 100:1 to 1:1, preferably from 50:1 to 2:1, more preferably from 20:1 to 5:1, suitably from 15:1 to 8:1, for example about 10:1.

According to a third aspect of the invention there is provided a method of removing colourfrom dyed hair, the method comprising contacting the hair with an alkaline composition comprising:

a)

b)

c) formamidine sulfinic acid; an inert hydrophobic liquid; urea; and

d) a sulfur containing nucleophile.

Suitably the method of the third aspect involves contacting the hair with a colour removal composition of the first aspect. Preferred features of the third aspect are as defined in relation to the first and second aspects.

Suitably in the method of the present invention the colour removal composition is applied to the hair, spread throughout the hair and left on the hair for at least 0.1 mins.

The composition may be applied to the hair by any suitable means. It may be applied using a brush or other implement of by hand. Suitably it is brushed on to the hair to provide an even coverage. Suitably the colour removal composition is contacted with the hair using a liquor ratio of from 5:1 to 1:1, preferably from 4:1 to 3:1, suitably about 2.5:1. By this we mean that 2.5 parts by weight of the composition is applied for each part by weight of hair used.

Suitably once the composition has been applied the hair is covered by a cap to prevent evaporation.

Suitably the colour removal composition is left on the hair for a period of at least 1 min, preferably at least 5 min, more preferably at least 10 min, for example at least 15 min or at least 20 min.

The colour removal composition may be left on the hair for up to 4 hours, suitably up to 3 hours, preferably up to 2 hours, for example up to 1.5 hours.

Preferably the colour removal composition is left on the hair for a period of 30 to 60 minutes.

The time for which the composition should be left in contact with the hair will depend on the starting colour of the hair. For hair that has been dyed with a light colour, colour removal can usually be achieved within 10 to 20 minutes. For black hair up to 60 minutes may be needed. The extent of the colour removal can be monitored by visual inspection.

Suitably the colour removal composition is applied to the hair and maintained on the head at a temperature of from 10 to 75 °C, preferably from 20 to 60 °C, more preferably from 30 to 50 °C.

When using temperatures above ambient temperature a suitable hood can be employed to achieve the required temperature.

The colour removal composition is then suitably rinsed from the hair.

Preferably the hair is then contacted with a oxidising composition.

In preferred embodiments the method of the third aspect involves the steps:

(x) preparing an alkaline colour removal composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile;

(y) contacting the hair with the colour removal composition; and (z) contacting the hair with an oxidising composition.

Suitably there is a step between step (y) and step (z) of rinsing the hair with water.

The oxidising composition may comprise any suitable oxidising agent. Preferred oxidising agents include bromate salts and peroxides. Suitable bromates include sodium bromate. Suitable peroxides include hydrogen peroxide.

Preferably the oxidising composition comprises hydrogen peroxide.

Preferably the oxidising composition comprises at least 0.01 wt% hydrogen peroxide, more preferably at least 0.05 wt%, suitably at least 0.1 wt%, for example at least 0.3 wt% or at least 0.5 wt%.

The composition may comprise up to 10 wt% hydrogen peroxide, suitably up to 7.5 wt%, preferably up to 5 wt%, suitably up to 3 wt%, for example up to 2 wt% or up to 1 wt%..

The oxidising composition is preferably an acidic composition.

The oxidising composition preferably has a pH of from 1 to 6.5, more preferably from 2 to 6, more preferably from 3 to 5, for example from 3 to 4 or from 3 to 3.5.

Suitable acids that may be included in the oxidising composition include organic and inorganic acids. Suitable organic acids include ascorbic acid, acetic acid, oxalic acid, lactic acid, formic acid, citric acid, glycolic acid, glucuronic acid, malic acid, mandelic acid, salicylic acid and tartaric acid.

Suitable inorganic acids include hydrochloric acid, sulfuric acid, nitric acid, phosphorous acid, hypophosphorous acid and phosphoric acid.

In especially preferred embodiments the oxidising composition comprises salicylic acid.

The acid is suitably present in an amount of from 0.01 to 3 wt%, preferably 0.1 to 1 wt%.

The oxidising composition preferably further comprises one or more surfactants. Suitable surfactants will be known to the person skilled in art and include anionic, cationic, non-ionic and amphoteric surfactants. Mixtures of surfactants may be present.

Suitable anionic surfactants for use herein include sulfate and sulfonate compounds including an alkyl or alkylene chain typically of 8 to 30 carbon atoms, preferably provided as an alkali metal or ammonium salt. Substituted ammonium salts may be used, for example tetraalkyl ammonium salts. Examples of suitable anionic surfactants include ammonium lauryl sulfate, alkyl ammonium lauryl sulfates, sodium lauryl sulfate, sodium laureth sulfate, sodium myreth sulfate and sodium dodecyl benzene sulfonate.

Suitable amphoteric surfactants include betaines and sultaines. Suitable betaines include alkyl betaines, for example cetyl betaine, lauryl betaine, stearyl betaine and behenyl betaine. Examples of suitable amphoteric surfactants include cocoamido propyl betaine, lauramido propyl betaine, cocamidopropyl hydroxysultaine and lauryl hydroxysultaine.

Suitable cationic surfactants for use herein include quaternary ammonium salts including one or more long alkyl or alkenyl chain typically of 8 to 30 carbon atoms, preferably provided as a chloride or bromide salt. Examples of suitable cationic surfactants include benzethonium trimethyl ammonium chloride, dimethyl dioctadecyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride and beheneth trimethyl ammonium chloride.

Suitable non-ionic surfactants for use herein include alkoxylated and polyalkoxylated compounds and fatty acids, fatty alcohols and fatty amines including one or more hydroxy alkyl substituents. Examples of suitable non-ionic surfactants include cocamide monoethanolamine, cocamide diethanolamine and polysorbate compounds. Preferred non-ionic surfactants are fatty alcohols and ethoxylated fatty alcohols, for example cetyl alcohol and stearyl alcohol.

Preferably the oxidising composition comprises a mixture of non ionic and cationic surfactants. Preferred surfactants for use in the oxidising composition include cetyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, stearyl alcohol, cetyl alcohol ceterath-25.

In preferred embodiments the oxidising composition comprises from 0.1 to 15 wt%, preferably 2 to 8 wt% surfactants.

The oxidising composition may comprise one or more further ingredients, for example those typically found in shampoo compositions. Such ingredients include surfactants, thickeners, fragrances, colourants, preservatives, conditioning agents, cosolvents and chelating agents. Examples of such ingredients may be found on the INCI list.

The oxidising composition is preferably an aqueous composition. Suitably it comprises 50 to 99.9 wt% water. It may comprise from 70 to 99 wt%, suitably 80 to 98 wt% water. Preferably it comprises from 85 to 95 wt% water.

The oxidising composition is preferably in the form of a viscous liquid or gel. It suitably has a consistency similar to that of shampoo and is used in a similar manner.

Suitably the oxidising composition is liberally applied to the hair and spread thoroughly throughout the hair. This may be done manually using the fingers as one might spread shampoo throughout the hair. Alternatively it may be applied using a brush.

Preferably after application of the oxidising composition it is allowed to remain in contact with the hair for a period of at least 30 seconds, suitably at least 1 minute, preferably at least 2 minutes, preferably at least 3 minutes, for example at least 4 minutes. The oxidising composition may be allowed to remain in contact with the hair for up to 20 minutes, suitably up to 15 minutes, preferably up to 10 minutes, more preferably up to 8 minutes, for example up to 6 minutes.

Step (z) may suitably be carried out at ambient temperature. However it has been observed to be more efficient at higher temperatures.

Following step (z) the composition may be rinsed from the hair, for example with warm water.

In some preferred embodiments step (z) is repeated.

Hair treated according to the present invention suitably has a colour that closely matches its colour prior to dyeing. In the case of a very strong colour or if the hair is very porous, the method may be repeated.

The present invention may be used to remove colour from hair that has been dyed using variety of different classes of hair dyes. For example the invention can very effectively remove colour from hair dyed using the compounds and methods described in the applicant’s applications WO 2010/032034 and WO 2009/112858. Furthermore the present invention also reliably removes colour from hair that has been oxidatively dyed and does not cause significant damage to the hair or use dangerous chemicals.

It has been surprisingly found that the inclusion of paraffin liquid in the colour removal composition provides a more homogeneous composition and faster colour removal.

According to a fourth aspect of the present invention there is provided a packaged hair colour removal product comprising:

(i) a first precursor composition comprising:

(c) urea; and (d) a sulfur containing nucleophile; and (iii) a oxidising composition.

Components (i), (ii) and (iii) may suitably be included in the packaged hair colour removal product in unit dose form. Thus in some preferred embodiments the packaged hair colour removal product of the present invention comprises components (i), (ii) and (iii) in an amount sufficient for use in a single colour removal event, for example to remove colour from a single head of human hair.

Suitably the packaged hair colour removal product further comprises instructions for using the compositions. The product may comprise further components, for example a disposable cap. It may optionally include apparatus for mixing the compositions and or applying to the head. For example it may include a mixing bowl, spoon, spatula, brush or disposable gloves.

Compositions (i), (ii) and (iii) are included in the kit in suitable packaging. They are suitably packaged separately. Any suitably packaging may be used and suitable packing will be known to the person skilled in the art.

The compositions may be packaged in bottles, jars, tubes, sachets or boxes. The packaging or each composition may be the same or different. In some embodiments one or more of the compositions may be packaged in an inert atmosphere, or in a vacuum.

Suitably the product of the fourth aspect comprises an outer packaging. The packaged colour removal product suitably contains all components necessary for a single colour removal event, for example the removal of colour from a single head of hair.

According to a fifth aspect of the present invention there is provided the use of an alkaline composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile; to remove colour from dyed hair.

The invention will now be further described with reference to the following non-limiting examples.

Example

A first precursor composition was prepared comprising the following components:

Ingredient	%w/w
Formamidine sulfinic acid	50
Paraffin liquid	50

A second precursor composition was prepared comprising the following components:

Ingredient	%w/w
Water	69.7
urea	19.1
Glycerin	3.0
polysorbate 80	2.9
Aminomethylpropanol	1.9
hydroxyethylcellulose	1.3
thioglycolic acid	1.4
parfum	0.5
Cetrimonium chloride	0.2

A comparative first precursor composition comprising only formamidine sulfinic acid was also prepared.

The first and second precursor compositions were mixed in a ratio of 1:10 by weight (first precursor composition : second precursor composition) to provide a colour removal gel.

A comparative colour removal composition was also prepared using the comparative precursor composition.

Figure 1A shows the comparative composition and Figure 1B shows the composition of the invention.

Figure 2 shows the comparative composition on the left and inventive composition on the right.

It can be clearly seen that the composition of the invention is homogenous whereas the comparative is not.

These compositions were applied to hair tresses that had been dyed using a Majirel 1 dye. As the photographs in Figure 3 illustrate (left pictures inventive, right pictures comparative), the compositions of the invention gave faster colour removal.

As the colour difference can be difficult to see in black and white photographs, the colour was measured using reflectance spectrometry. The values were measured according to the “CIE L*a*b*’ or CIELAB system. This system will be known to the person skilled in the art. The results for the hair tresses shown in figure 3 are given in table 1.

It should be noted that a higher value for L* indicates a lighter colour of hair and therefore greater decolourisation.

Table 1

Time (mins)	With Paraffin	Without paraffin
	L*	a*	b*	L*	a*	b*
0	30.514	1.054	-5.012	30.97	0.72	-5.548
10	34.32	2.624	-2.032	30.684	0.742	-5.912
20	38.494	1.71	0.374	33.106	1.978	-3.602
30	43.588	1.14	3.632	35.312	1.788	-1.83
40	42.494	1.82	7.092	38.006	1.71	1.144
50	44.42	3.148	10.214	41.826	3.716	7.806
60	52.65	7.934	21.208	47.67	6.376	14.848

The experiment was repeated using hair dyed using a Majirel 5 dye. The results are shown in Figure 4 and table 2.

Table 2

Time (mins)	With Paraffin		Without paraffin
	L*	a*	b*	L*	a*	b*
10	47.496	0.702	3.702	46.898	0.296	1.242
20	55.404	1.216	13.482	54.016	0.22	8.292
30	61.294	4.37	21.684	59.066	1.89	14.494
40	62.368	3.326	23.36	60.85	3.538	19.522

A oxidising composition having the formula below was applied to the hair after rinsing.

Ingredient	%w/w
water	91.5
cetyl alcohol	2.0
stearyl alcohol	2.0
Behentrimonium chloride	1.0
hydrogen peroxide	0.8
ceteareth-25	0.8
Cetrimonium chloride	0.3
sodium benzoate	0.3
EDTA	0.3
salicylic acid	0.3
Isopropyl alcohol	0.3
trisodium phosphate	0.2
etidronic acid	0.2

Claims

1. An alkaline colour removal composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile.

2. A composition according to claim 1 wherein the inert hydrophobic liquid is paraffin liquid.

3. A composition according to claim 1 or claim 2 wherein the sulfur containing nucleophile is thioglycolic acid.

4. A composition according to any preceding claim which has a pH of 9 to 10.

5. A colour removal kit comprising:

(i) a first precursor composition comprising:

(c) urea; and (d) a sulfur containing nucleophile.

6. A method of removing colour from dyed hair, the method comprising contacting the hair with an alkaline composition comprising:

a)

b)

c)

d) formamidine sulfinic acid; an inert hydrophobic liquid; urea; and a sulfur containing nucleophile.

7. A method according to claim 6 which involves the steps of:

(x) preparing an alkaline colour removal composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile;

(y) contacting the hair with the colour removal composition; and (z) contacting the hair with a oxidising composition.

8. A method according to claim 7 wherein there is a step between step (y) and step (z) of rinsing the hair with water.

9. The use of an alkaline composition comprising:

a) formamidine sulfinic acid;

b) paraffin liquid;

c) urea; and

d) a sulfur containing nucleophile; to remove colour from dyed hair.

Intellectual

Property

Office

Application No: GB1711291.3 Examiner: Mr Robert Goodwill

9. A packaged hair colour removal product comprising:

(i) a first precursor composition comprising:

10. The use of an alkaline composition comprising:

a) formamidine sulfinic acid;

b) an inert hydrophobic liquid;

c) urea; and

d) a sulfur containing nucleophile; to remove colour from dyed hair.

Amendments to the claims have been filed as follows:

Claims

1. An alkaline colour removal composition comprising:

a)

b)

c)

d) formamidine sulfinic acid; paraffin liquid; urea; and a sulfur containing nucleophile;

25 04 18 wherein the weight ratio of component (a) to component (b) is from 2:1 to 1:2.

2. A composition according to claim 1 wherein the sulfur containing nucleophile is thioglycolic acid.

3. A composition according to claim 1 or claim 2 which has a pH of 9 to

10.

4. A colour removal kit comprising:

(i) a first precursor composition comprising:

(a) formamidine sulfinic acid; and (b) paraffin liquid; and (ii) a second precursor composition comprising:

(c) urea; and (d) a sulfur containing nucleophile;

wherein the weight ratio of component (a) to component (b) is from 2:1 to 1:2.

5. A method of removing colour from dyed hair, the method comprising contacting the hair with an alkaline composition comprising:

a)

b)

c)

d) formamidine sulfinic acid; paraffin liquid; urea; and a sulfur containing nucleophile.

6. A method according to claim 5 which involves the steps of:

(x) preparing an alkaline colour removal composition comprising:

a) formamidine sulfinic acid;

b) paraffin liquid;

c) urea; and

d) a sulfur containing nucleophile;

7. A method according to claim 6 wherein there is a step between step (y) and step (z) of rinsing the hair with water.

8. A packaged hair colour removal product comprising:

(i) a first precursor composition comprising:

(a) formamidine sulfinic acid; and (b) paraffin liquid; and

25 04 18 (ii) a second precursor composition comprising:

(c) urea; and (d) a sulfur containing nucleophile; and (iii) an oxidising composition;

wherein the weight ratio of component (a) to component (b) is from 2:1 to 1:2.