CA2234964C - A depilatory composition with improved rinsing properties - Google Patents
A depilatory composition with improved rinsing properties Download PDFInfo
- Publication number
- CA2234964C CA2234964C CA002234964A CA2234964A CA2234964C CA 2234964 C CA2234964 C CA 2234964C CA 002234964 A CA002234964 A CA 002234964A CA 2234964 A CA2234964 A CA 2234964A CA 2234964 C CA2234964 C CA 2234964C
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- CA
- Canada
- Prior art keywords
- composition
- depilatory
- compositions
- thixotropic agent
- skin
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q9/00—Preparations for removing hair or for aiding hair removal
- A61Q9/04—Depilatories
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/26—Aluminium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q5/00—Preparations for care of the hair
- A61Q5/04—Preparations for permanent waving or straightening the hair
Abstract
A depilatory composition has improved rinsing properties by the inclusion of a thixotropic agent. Preferred thixotropic agents are smectite clays, in particular Laponite.
Description
CA 02234964 1998-04-1~
A Depilatory Composition with Improved Rinsing Properties The present invention relates to compositions for the treatment of hair and, in particular, to hair treatment compositions having improved rinsing properties. The invention relates especially to depilatory compositions, but will also find application in permlng compositions.
Depilatory compositions are conventionally applied to the skin in the form of a cream, lotion, gel or mousse. After a period of time, the depilatory composition is removed by suitable means, such as by the use of a spatula. The active depilatory ingredient of the composition is conventionally an alkali metal salt or alkaline earth metal salt of an alpha or beta mercapto-carboxylic acid, such as potassium or calcium thioglycolate. These materials act by penetrating the hair and destroying the cystine bonds between the hair molecules. This weakens the hair to such an extent that the action of scraping and wiping away the depilatory composition causes the hair to break off at skin level, so that the hair may be removed.
A particular problem with compositions of this type is that the composition is difficult to remove completely from the skin and cannot be removed easily by simply rinsing away the composition. A heavy or vigorous mechanical scrubbing or scraping action is AMEND~D Slr~EE~
CA 02234964 1998-04-1~
W O 97/14397 P~T/GB96/02497 -2-required, for example with a spatula, which can be a cause of conslderable discomfort and inconvenience.
Accordingly, the present invention seeks to provide hair treatment compositions, in particular depilatory compositions, having improved rinsing properties.
For conventional depilatory compositions in the form of a cream, lotion, gel or mousse, the emulsion i5 normally stabilised by including a relatively high amount of thickener in the composition. For example, conventional thickeners, which will be well known to those skilled in the art, are generally present at levels of up to 30~ w/w. Alternatively, depilatory creams, lotions and gels can be formulated to give a stable emulsion by including high levels of fatty materials in the depilatory composition. In such compositions, either no thickener is present, or a small amount of thickener may be present.
In both cases, however, good rinsability of the depilatory composition from the skin will not be achieved. In the case where a high level of thickener is present, there will be such strong steric interactions between the polymeric materials in the emulsion that it is not possible to remove the depilatory composition ~uickly and easily from the skin by the mechanical action of water together with a light rubbing action. Where high levels o~ ~atty materials are present, the texture or "body" of the ~!
CA 02234964 1998-04-1~
W O 97/143g7 PCT/GB96/02497 --3--depilatory composition will be too strong to allow the ~ composition to be rinsed simply from the skin.
~ For example, International Patent Application No.
S PCT/EP92/02494; WO 93/08791 (The Boots Company PLC) describes depilatory ~ormulations including, inter alia, smectite or kaolin clays such as bentonite. The clays are said to improve the feel of the depilatory composition on the skin and to reduce the unpleasant smell associated with the depilatory agent. However, the compositions described in WO 93/08791 would not have the improved rinsability o~ ~he depilatory compositions of the present invention. That is, the compositions described in WO 93/08791, containing the levels of thickeners and fatty materials as speci~ied, would not be able to be rinsed simply from the skin by the mechanical action of water together with a light rubbing action.
However, in accordance with the present invention, we have found that it is possible to formulate a depilatory composition which is sufficiently stable to provide a good depilatory product, but which has weak enough steric interactions between the polymeric materials in the composition to provide improved rinsing properties.
It has now been found surprisingly that the incorporation in a hair treatment composition o~ a viscosity enhancer which imparts a shear sensitive , CA 02234964 1998-04-1~
' structure to the composition (hereinafter called a thixotropic agent) provides such improved rinsing properties. The incorporation of a thixotropic agent in a depilatory composition allows the composition to be rinsed off the skin simply, for example, by the mechanical action of water from a shower together with a light rubbing action. The need for heavy scrubbing or scraping with a spatula or the like is thus avoided. The sensitivity of the composition to shear forces can be made so acute that the mere mechanical action on the skin of water from the shower is sufficient for effective removal of the composition, but such a degree of shear sensitivity may adversely affect other properties of the composition.
Accordingly, the first aspect of the present invention provides a depilatory composition having a shear sensitive structure, which composition contains an active depilating agent; 0.25% to 2% w/w of a thixotropic agent and 5% to 15% w/w fatty materials.
By "shear sensitive structure" we mean that the sensitivity of the depilatory composition of the present invention to shear forces is such that the mechanical action on the skin of water alone, or the mechanical action on the skin of water together with a light rubbing action, is sufficient to remove the composition from the skin.
In accordance with a second aspect of the present invention there is provided the use, in a depilatory composition, of 0.25% to 2% w/w of a thixotropic agent and 5% to 15% w/w fatty materials to impart a shear sensitive structure to the composition.
j~ CA 02234964 1998-04-1~
S
The compositions of the invention may include any suitable mineral or organic thixotropic agent, but particularly preferred thixotropic agents include smectite clays, synthetic hectorite cLays such as Laponite LS (RTM) from Laporte, colloidal montmorillonites such as those available under the trade name Gelwhite (RTM) from Southern Clay Products Inc, USA and Laporte, silicoaluminate clays such as the collidal magnesium aluminium silicate derived from natural smectic clay obtainable as Veegum (RTM) from Vanderbilt Products (USA) and xanthan gums such as Keltrol T (RTM) from Kelco.
The thixotropic agent is present in an amount of 0.25% to 2% w/w, preferably in an amount of 0.25% to 1% w/w, and especially about 1~ w/w.
The compositions of the invention preferably include 1.5% to 8% w/w (most preferably 2.5% to 5% w/w) of an active depilatory agent. In the compositions of the invention, the depilatory agent will preferably act by reducing disulfide bonds in the hair and in principle any suitable reducing agent may be used. Suitable examples include mercaptans and sulfides such as organic sulfides, especially alkyl sulfides.
Preferred depilatory agents are alkaline salts of thioglycolic acid such as the lithium, sodium, potassium or calcium salts. The potassium and calcium AMENDED SHEET
CA 02234964 l998-04-lj salts, alone or in mixture, are particularly pre~erred. Other suitable depilatory agents include thioglycerol, mercapto propionic acid and dithioerythritol.
Cptionally, the compositions of the invention may ~urther include an accelerator to facilitate the action of the depilatory agent, preferably in an amount of 3~ to 10~ w/w and particularly preferably not less than 5~ w/w. A pre~erred accelerator is urea.
Additional polymeric thickening agents may be included in the compositions of the invention in amounts of 0 to 2~ w/w, preferably 0 to 0.5~ w/w, especially 0.1~ w/w. Appropriate thickening agents can also contribute to the stability of the composition.
The compositions of the invention will preferably have a pH o~ at least 10.5, particularly preferably 11.5 to 12.7 (whilst the pH could be higher than 12.7, the latter value is the highest permitted in Europe).
Suitable materials ~or achieving the desired pH
include calcium hydroxide (at a concentration of 2~ to 4~ w/w) or alkaline silicates such as meta- or trisilicates.
The compositions of the invention will also desirably include texturising agents to provide the composition with a desired texture or "body" whereby CA 02234964 1998-04-1~ .
. -.
the depilatory composition can be maintained on the skin in contact with the hair and in the correct quantity to achieve a satisfactory degree of hair digestion ln a suitable time. Suitable materials ~or this purpose are generally known in the art and include, for example, fatty materials such as fatty alcohols (for example cetostearyl alcohol) alone or in combination with paraffin oils. These materials are preferably present in amounts of, for example, 8% to 15% w/w. An appropriate emulsifier such as a non-lonic ethoxylated fatty alcohol may also be included, suitably in an amount of 1~ to 5% w/w. An example of a suitable emulsifier is ceteareth 20, supplied by Henkel. The compositions of the invention may further include buffering agents (such as calcium hydroxide) (2% to 6% w/w), cosmetic ingredients such as moisturising agents (for example Aloe Vera extracts) and skin smoothing agents (for example, almond oil, shea butter, lanolin and allantoin), colouring agents (0.4% to 0.6% w/w) and perfumes (0.55~ to 0.7% w/w), with the balance being water.
Most preferably, the amount of thixotropic agent and the amount of fatty materials present in the compositions of the invention will be adjusted to provide the best rinsing properties.
According to a further aspect of the present invention there is provided a depilatory composition AMENDED S~!E~
CA 02234964 1998-04-1~
having a shear sensitive structure, which composition contains 0.25% to 2% w/w (especially 0.25~ to 1% w/w) of a thixotropic agent and 8% to 15g w/w (especially 8% to 11% w/w) fatty materials.
By "fatty materials" we mean any materials commonly found in the oil phase of a cosmetic emulsion, especially materials having a hydrocarbon chain of at least six carbons of very poor water solubility, for example paraffin oil, fatty alcohols and fatty esters, and any emulsifying agents soluble in the above-mentioned materials, for example fatty alcohol ethoxylates, fatty amide ethoxylates and soaps.
Examples The following depilatory compositlons were prepared:
Composition A (Reference composition) Cetostearyl alcohol 8%
20 (C1680%, Cl82~%) Ceteareth 20 2%
Urea 10~
KOH 2.7%
Thioglycolic acid 4.5%
Calcium hydroxide 2.9%*
25 Dye 0 5%
AMENl:)Fn C~H~
Balance, water *Calcium hydroxide is added in an amount to achieve the desired pH - preferably pH 12.5 s Composition B
The following pre-mixes were first prepared:
1. Laponite XLG (RTM) 1~
Water 2.0%
A Depilatory Composition with Improved Rinsing Properties The present invention relates to compositions for the treatment of hair and, in particular, to hair treatment compositions having improved rinsing properties. The invention relates especially to depilatory compositions, but will also find application in permlng compositions.
Depilatory compositions are conventionally applied to the skin in the form of a cream, lotion, gel or mousse. After a period of time, the depilatory composition is removed by suitable means, such as by the use of a spatula. The active depilatory ingredient of the composition is conventionally an alkali metal salt or alkaline earth metal salt of an alpha or beta mercapto-carboxylic acid, such as potassium or calcium thioglycolate. These materials act by penetrating the hair and destroying the cystine bonds between the hair molecules. This weakens the hair to such an extent that the action of scraping and wiping away the depilatory composition causes the hair to break off at skin level, so that the hair may be removed.
A particular problem with compositions of this type is that the composition is difficult to remove completely from the skin and cannot be removed easily by simply rinsing away the composition. A heavy or vigorous mechanical scrubbing or scraping action is AMEND~D Slr~EE~
CA 02234964 1998-04-1~
W O 97/14397 P~T/GB96/02497 -2-required, for example with a spatula, which can be a cause of conslderable discomfort and inconvenience.
Accordingly, the present invention seeks to provide hair treatment compositions, in particular depilatory compositions, having improved rinsing properties.
For conventional depilatory compositions in the form of a cream, lotion, gel or mousse, the emulsion i5 normally stabilised by including a relatively high amount of thickener in the composition. For example, conventional thickeners, which will be well known to those skilled in the art, are generally present at levels of up to 30~ w/w. Alternatively, depilatory creams, lotions and gels can be formulated to give a stable emulsion by including high levels of fatty materials in the depilatory composition. In such compositions, either no thickener is present, or a small amount of thickener may be present.
In both cases, however, good rinsability of the depilatory composition from the skin will not be achieved. In the case where a high level of thickener is present, there will be such strong steric interactions between the polymeric materials in the emulsion that it is not possible to remove the depilatory composition ~uickly and easily from the skin by the mechanical action of water together with a light rubbing action. Where high levels o~ ~atty materials are present, the texture or "body" of the ~!
CA 02234964 1998-04-1~
W O 97/143g7 PCT/GB96/02497 --3--depilatory composition will be too strong to allow the ~ composition to be rinsed simply from the skin.
~ For example, International Patent Application No.
S PCT/EP92/02494; WO 93/08791 (The Boots Company PLC) describes depilatory ~ormulations including, inter alia, smectite or kaolin clays such as bentonite. The clays are said to improve the feel of the depilatory composition on the skin and to reduce the unpleasant smell associated with the depilatory agent. However, the compositions described in WO 93/08791 would not have the improved rinsability o~ ~he depilatory compositions of the present invention. That is, the compositions described in WO 93/08791, containing the levels of thickeners and fatty materials as speci~ied, would not be able to be rinsed simply from the skin by the mechanical action of water together with a light rubbing action.
However, in accordance with the present invention, we have found that it is possible to formulate a depilatory composition which is sufficiently stable to provide a good depilatory product, but which has weak enough steric interactions between the polymeric materials in the composition to provide improved rinsing properties.
It has now been found surprisingly that the incorporation in a hair treatment composition o~ a viscosity enhancer which imparts a shear sensitive , CA 02234964 1998-04-1~
' structure to the composition (hereinafter called a thixotropic agent) provides such improved rinsing properties. The incorporation of a thixotropic agent in a depilatory composition allows the composition to be rinsed off the skin simply, for example, by the mechanical action of water from a shower together with a light rubbing action. The need for heavy scrubbing or scraping with a spatula or the like is thus avoided. The sensitivity of the composition to shear forces can be made so acute that the mere mechanical action on the skin of water from the shower is sufficient for effective removal of the composition, but such a degree of shear sensitivity may adversely affect other properties of the composition.
Accordingly, the first aspect of the present invention provides a depilatory composition having a shear sensitive structure, which composition contains an active depilating agent; 0.25% to 2% w/w of a thixotropic agent and 5% to 15% w/w fatty materials.
By "shear sensitive structure" we mean that the sensitivity of the depilatory composition of the present invention to shear forces is such that the mechanical action on the skin of water alone, or the mechanical action on the skin of water together with a light rubbing action, is sufficient to remove the composition from the skin.
In accordance with a second aspect of the present invention there is provided the use, in a depilatory composition, of 0.25% to 2% w/w of a thixotropic agent and 5% to 15% w/w fatty materials to impart a shear sensitive structure to the composition.
j~ CA 02234964 1998-04-1~
S
The compositions of the invention may include any suitable mineral or organic thixotropic agent, but particularly preferred thixotropic agents include smectite clays, synthetic hectorite cLays such as Laponite LS (RTM) from Laporte, colloidal montmorillonites such as those available under the trade name Gelwhite (RTM) from Southern Clay Products Inc, USA and Laporte, silicoaluminate clays such as the collidal magnesium aluminium silicate derived from natural smectic clay obtainable as Veegum (RTM) from Vanderbilt Products (USA) and xanthan gums such as Keltrol T (RTM) from Kelco.
The thixotropic agent is present in an amount of 0.25% to 2% w/w, preferably in an amount of 0.25% to 1% w/w, and especially about 1~ w/w.
The compositions of the invention preferably include 1.5% to 8% w/w (most preferably 2.5% to 5% w/w) of an active depilatory agent. In the compositions of the invention, the depilatory agent will preferably act by reducing disulfide bonds in the hair and in principle any suitable reducing agent may be used. Suitable examples include mercaptans and sulfides such as organic sulfides, especially alkyl sulfides.
Preferred depilatory agents are alkaline salts of thioglycolic acid such as the lithium, sodium, potassium or calcium salts. The potassium and calcium AMENDED SHEET
CA 02234964 l998-04-lj salts, alone or in mixture, are particularly pre~erred. Other suitable depilatory agents include thioglycerol, mercapto propionic acid and dithioerythritol.
Cptionally, the compositions of the invention may ~urther include an accelerator to facilitate the action of the depilatory agent, preferably in an amount of 3~ to 10~ w/w and particularly preferably not less than 5~ w/w. A pre~erred accelerator is urea.
Additional polymeric thickening agents may be included in the compositions of the invention in amounts of 0 to 2~ w/w, preferably 0 to 0.5~ w/w, especially 0.1~ w/w. Appropriate thickening agents can also contribute to the stability of the composition.
The compositions of the invention will preferably have a pH o~ at least 10.5, particularly preferably 11.5 to 12.7 (whilst the pH could be higher than 12.7, the latter value is the highest permitted in Europe).
Suitable materials ~or achieving the desired pH
include calcium hydroxide (at a concentration of 2~ to 4~ w/w) or alkaline silicates such as meta- or trisilicates.
The compositions of the invention will also desirably include texturising agents to provide the composition with a desired texture or "body" whereby CA 02234964 1998-04-1~ .
. -.
the depilatory composition can be maintained on the skin in contact with the hair and in the correct quantity to achieve a satisfactory degree of hair digestion ln a suitable time. Suitable materials ~or this purpose are generally known in the art and include, for example, fatty materials such as fatty alcohols (for example cetostearyl alcohol) alone or in combination with paraffin oils. These materials are preferably present in amounts of, for example, 8% to 15% w/w. An appropriate emulsifier such as a non-lonic ethoxylated fatty alcohol may also be included, suitably in an amount of 1~ to 5% w/w. An example of a suitable emulsifier is ceteareth 20, supplied by Henkel. The compositions of the invention may further include buffering agents (such as calcium hydroxide) (2% to 6% w/w), cosmetic ingredients such as moisturising agents (for example Aloe Vera extracts) and skin smoothing agents (for example, almond oil, shea butter, lanolin and allantoin), colouring agents (0.4% to 0.6% w/w) and perfumes (0.55~ to 0.7% w/w), with the balance being water.
Most preferably, the amount of thixotropic agent and the amount of fatty materials present in the compositions of the invention will be adjusted to provide the best rinsing properties.
According to a further aspect of the present invention there is provided a depilatory composition AMENDED S~!E~
CA 02234964 1998-04-1~
having a shear sensitive structure, which composition contains 0.25% to 2% w/w (especially 0.25~ to 1% w/w) of a thixotropic agent and 8% to 15g w/w (especially 8% to 11% w/w) fatty materials.
By "fatty materials" we mean any materials commonly found in the oil phase of a cosmetic emulsion, especially materials having a hydrocarbon chain of at least six carbons of very poor water solubility, for example paraffin oil, fatty alcohols and fatty esters, and any emulsifying agents soluble in the above-mentioned materials, for example fatty alcohol ethoxylates, fatty amide ethoxylates and soaps.
Examples The following depilatory compositlons were prepared:
Composition A (Reference composition) Cetostearyl alcohol 8%
20 (C1680%, Cl82~%) Ceteareth 20 2%
Urea 10~
KOH 2.7%
Thioglycolic acid 4.5%
Calcium hydroxide 2.9%*
25 Dye 0 5%
AMENl:)Fn C~H~
Balance, water *Calcium hydroxide is added in an amount to achieve the desired pH - preferably pH 12.5 s Composition B
The following pre-mixes were first prepared:
1. Laponite XLG (RTM) 1~
Water 2.0%
2. Calcium Hydroxide 2.9%
Water 15.0%
Water 15.0%
3. Cetostearyl alcohol 8~
Polyethyleneglycol fatty alcohol 1.25%
Almond oll . 0.5%
Polyethyleneglycol fatty alcohol 1.25%
Almond oll . 0.5%
4. Urea (technical grade) 8~
Water 10%
These premixes may be heated as known in the art to achieve dispersion/dissolution.
The final mixture was then prepared in the following sequence:
1. Premix 1 2. Dye (0.69~) AMENDED SI~EFr 3. Premix 2 4. Premix 3 5. Water (12.5~) J 6. Premix 4 5 7. Perfume (0.55~) 8. 30~ Potassium thioglycolate (10.0~) 9. Water to 100 Com~osition C
Composition B ~urther including 0.5~ Viscose fibres, length lmm and 5.0~ Low density polyethylene microparticles (230~m).
Composition D
The following pre-mixes were first prepared:
l. Calcium hydroxide 2.9 Water 20 2. Cetostearyl alcohol 8 Polyethyleneglycol fatty alcohol 2.5 Almond oil 3. Laponite XLG 1 Urea (technical grade) 8 30~ Potassium thioglycolate 10~
Water balance CA 02234964 1998-04-1~
The ~inal mixture was then prepared in the ~ollowing sequence.
S 1. Premix 1 2. Dye (0.69~) 3. Premix 2 4. Premix 3 5. Per~ume (0.55~) Compositon A was prepared by mixing at a suitable temperature, e.g. 70~C, the emulsifier, the ~atty ingredients and part o~ the water to form a primary emulsion. After cooling to below 40~C, the remaining ingredients were added.
In the compositions of the invention, the thioxotropic agent is preferably added as a gel to the primary emulsion (e.g. premixes 1, 2 and dye in composition D).
The rinsing properties o~ depilatory compositions A, B and C were tested in vitro using the ~ollowing protocol:
17g o~ the composition was applied evenly to a ~Velcro" (TM) strip (5cm x 20cm) mounted on a support.
The composition was then rinsed using a warm water shower with a water output o~ 0.16 l/s, with the shower head maintained perpendicular to the coated CA 02234964 1998-04-1~
"Velcro" (TM) strip at a distance of 5 to lOcm. The time taken to remove the compositions from the "Velcro" (TM) strip was measured. The results are J indicated in Table 1.
T~hle ~ _ Composition Rinsing time (s) A 41.3 B 13.0 C 12.3 D 13.0 From the above it can be appreciated that the inclusion of a thixotropic agent significantly improves the rinsability of the compositions.
Comparative tests were also conducted in vivo on 22 volunteers at the applicant's premises. The tested formulations were Composition C and, as the comparative formulation, Composition A. The results of these tests are set out below.
The volunteers were asked to compare the two compositions, by giving a rating for each composition between 1 and 10 having used the preparations, with 1 indicating very poor results and 10 indicating very good results.
CA 02234964 1998-04-1~
Test Rating for Rating for Composltion A Composition C
Easy to Remove 6.5 8.0 Provides soft skin 7.0 8.0 5 Easy to rinse 6.0 7.5 No greasy skin feel 7.0 8.5 Texture 7.0 6.0 Colour 7.5 6.0 It is apparent that Composition C was perceived by the volunteers to be superior in all respects with the exception of the colour (attributable to the particular fibres used) and texture (attributable to the fibres and the microparticles.).
A further test on three volunteers known to be sensitive to depilatory compositions showed no difference in skin irritancy between Composition C and Composition A.
A~lENDEn ~'IEET
Water 10%
These premixes may be heated as known in the art to achieve dispersion/dissolution.
The final mixture was then prepared in the following sequence:
1. Premix 1 2. Dye (0.69~) AMENDED SI~EFr 3. Premix 2 4. Premix 3 5. Water (12.5~) J 6. Premix 4 5 7. Perfume (0.55~) 8. 30~ Potassium thioglycolate (10.0~) 9. Water to 100 Com~osition C
Composition B ~urther including 0.5~ Viscose fibres, length lmm and 5.0~ Low density polyethylene microparticles (230~m).
Composition D
The following pre-mixes were first prepared:
l. Calcium hydroxide 2.9 Water 20 2. Cetostearyl alcohol 8 Polyethyleneglycol fatty alcohol 2.5 Almond oil 3. Laponite XLG 1 Urea (technical grade) 8 30~ Potassium thioglycolate 10~
Water balance CA 02234964 1998-04-1~
The ~inal mixture was then prepared in the ~ollowing sequence.
S 1. Premix 1 2. Dye (0.69~) 3. Premix 2 4. Premix 3 5. Per~ume (0.55~) Compositon A was prepared by mixing at a suitable temperature, e.g. 70~C, the emulsifier, the ~atty ingredients and part o~ the water to form a primary emulsion. After cooling to below 40~C, the remaining ingredients were added.
In the compositions of the invention, the thioxotropic agent is preferably added as a gel to the primary emulsion (e.g. premixes 1, 2 and dye in composition D).
The rinsing properties o~ depilatory compositions A, B and C were tested in vitro using the ~ollowing protocol:
17g o~ the composition was applied evenly to a ~Velcro" (TM) strip (5cm x 20cm) mounted on a support.
The composition was then rinsed using a warm water shower with a water output o~ 0.16 l/s, with the shower head maintained perpendicular to the coated CA 02234964 1998-04-1~
"Velcro" (TM) strip at a distance of 5 to lOcm. The time taken to remove the compositions from the "Velcro" (TM) strip was measured. The results are J indicated in Table 1.
T~hle ~ _ Composition Rinsing time (s) A 41.3 B 13.0 C 12.3 D 13.0 From the above it can be appreciated that the inclusion of a thixotropic agent significantly improves the rinsability of the compositions.
Comparative tests were also conducted in vivo on 22 volunteers at the applicant's premises. The tested formulations were Composition C and, as the comparative formulation, Composition A. The results of these tests are set out below.
The volunteers were asked to compare the two compositions, by giving a rating for each composition between 1 and 10 having used the preparations, with 1 indicating very poor results and 10 indicating very good results.
CA 02234964 1998-04-1~
Test Rating for Rating for Composltion A Composition C
Easy to Remove 6.5 8.0 Provides soft skin 7.0 8.0 5 Easy to rinse 6.0 7.5 No greasy skin feel 7.0 8.5 Texture 7.0 6.0 Colour 7.5 6.0 It is apparent that Composition C was perceived by the volunteers to be superior in all respects with the exception of the colour (attributable to the particular fibres used) and texture (attributable to the fibres and the microparticles.).
A further test on three volunteers known to be sensitive to depilatory compositions showed no difference in skin irritancy between Composition C and Composition A.
A~lENDEn ~'IEET
Claims (7)
1. ~A depilatory composition having a shear sensitive structure, which composition contains an active depilating agent; 0.25% to 2% w/w of a thixotropic agent 5% to 15% w/w fatty materials.
2. ~A composition as claimed in claim 1, wherein the thixotropic agent is a smectite clay.
3. ~A composition as claimed in claim 1 or 2, wherein the thixotropic agent is a sodium magnesium silicate clay.
4. ~A composition as claimed in claim 1, wherein the thixotropic agent is a silicoaluminate clay.
5. ~A composition as claimed in any one of claims 1 to 4, wherein the thixotropic agent is present in an amount of 0.25% to 1% w/w.
6. ~A composition as claimed in any one of claims 1 to 5, which includes 8% to 11% w/w fatty materials.
7. ~The use, in a depilatory composition, of 0.25% to 2% w/w of a thixotropic agent and 5% to 15% w/w fatty materials to impart a shear sensitive structure to the composition.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9521101.7 | 1995-10-16 | ||
| GBGB9521101.7A GB9521101D0 (en) | 1995-10-16 | 1995-10-16 | Improvements in or relating to organic compositions |
| PCT/GB1996/002497 WO1997014397A1 (en) | 1995-10-16 | 1996-10-14 | A depilatory composition with improved rinsing properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2234964A1 CA2234964A1 (en) | 1997-04-24 |
| CA2234964C true CA2234964C (en) | 2003-12-23 |
Family
ID=10782331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002234964A Expired - Lifetime CA2234964C (en) | 1995-10-16 | 1996-10-14 | A depilatory composition with improved rinsing properties |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US6203784B1 (en) |
| EP (1) | EP0855900B1 (en) |
| AR (1) | AR003889A1 (en) |
| AU (1) | AU716159B2 (en) |
| BR (1) | BR9610930A (en) |
| CA (1) | CA2234964C (en) |
| DE (1) | DE69631289T2 (en) |
| ES (1) | ES2211979T3 (en) |
| GB (2) | GB9521101D0 (en) |
| MX (1) | MX9802950A (en) |
| NZ (1) | NZ319674A (en) |
| WO (1) | WO1997014397A1 (en) |
| ZA (1) | ZA968677B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9720372D0 (en) * | 1997-07-09 | 1997-11-26 | Reckitt & Colman France | |
| DE19858241A1 (en) * | 1998-12-17 | 2000-06-21 | Henkel Kgaa | Thickened preparation of water-soluble surfactants |
| EP1222913B1 (en) * | 1999-10-21 | 2005-09-28 | Kao Corporation | Depilating method |
| US20060272155A1 (en) * | 2002-04-24 | 2006-12-07 | Eveready Battery Company, Inc. | Razor head apparatus |
| GB2417899A (en) * | 2004-08-26 | 2006-03-15 | Reckitt Benckiser | Depilatory composition for use in a wet environment |
| US20080193402A1 (en) * | 2005-05-26 | 2008-08-14 | Adamy Steven T | Depilatory Compositions |
| US20060269489A1 (en) * | 2005-05-26 | 2006-11-30 | Adamy Steven T | Depilatory compositions |
| GB0600788D0 (en) * | 2006-01-16 | 2006-02-22 | Reckitt Benckiser Uk Ltd | Composition, process for preparation and method of use |
| FR2933615B1 (en) * | 2008-07-09 | 2010-08-27 | Jean Francois Mondin | EPILATION PRODUCT AND PROCESS FOR PREPARING |
| MX2012009637A (en) * | 2010-02-17 | 2012-09-12 | Procter & Gamble | Efficacious depilatory article. |
| BR112012020665A2 (en) * | 2010-02-17 | 2016-07-26 | Procter & Gamble | depilatory article |
| EP2368541B1 (en) * | 2010-03-26 | 2011-12-21 | The Procter & Gamble Company | Method of depilation and depilatory kit |
| WO2011119794A2 (en) * | 2010-03-26 | 2011-09-29 | The Procter & Gamble Company | Hair removal method and hair removal kit |
| WO2011119557A2 (en) * | 2010-03-26 | 2011-09-29 | The Procter & Gamble Company | Kit and method for removing hair |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE633127A (en) | 1962-06-22 | |||
| US3981681A (en) | 1974-04-16 | 1976-09-21 | Carson Products Company | Depilatory formulation |
| US4111653A (en) | 1977-02-16 | 1978-09-05 | The Gillette Company | Alkali stannite depilatories |
| US4618344A (en) | 1982-06-01 | 1986-10-21 | The Procter & Gamble Company | Depilatory compositions |
| JPS6097912A (en) | 1983-10-31 | 1985-05-31 | Shiseido Co Ltd | Wax for removal of hair |
| GB8400908D0 (en) | 1984-01-13 | 1984-02-15 | Louis Marcel Ltd | Detergent compositions |
| GB8720937D0 (en) | 1987-09-05 | 1987-10-14 | Boots Co Plc | Depilatory compositions |
| JPH04173725A (en) | 1990-11-08 | 1992-06-22 | Shiseido Co Ltd | Foamy depilatory agent |
| GB9118866D0 (en) | 1991-09-04 | 1991-10-23 | Unilever Plc | Cosmetic composition |
| GB9123076D0 (en) | 1991-10-31 | 1991-12-18 | Boots Co Plc | Depilatory compositions |
| US5653970A (en) * | 1994-12-08 | 1997-08-05 | Lever Brothers Company, Division Of Conopco, Inc. | Personal product compositions comprising heteroatom containing alkyl aldonamide compounds |
-
1995
- 1995-10-16 GB GBGB9521101.7A patent/GB9521101D0/en active Pending
-
1996
- 1996-10-11 US US08/730,305 patent/US6203784B1/en not_active Expired - Lifetime
- 1996-10-14 CA CA002234964A patent/CA2234964C/en not_active Expired - Lifetime
- 1996-10-14 BR BR9610930-0A patent/BR9610930A/en not_active IP Right Cessation
- 1996-10-14 WO PCT/GB1996/002497 patent/WO1997014397A1/en active IP Right Grant
- 1996-10-14 EP EP96933546A patent/EP0855900B1/en not_active Expired - Lifetime
- 1996-10-14 AU AU72244/96A patent/AU716159B2/en not_active Expired
- 1996-10-14 DE DE1996631289 patent/DE69631289T2/en not_active Expired - Lifetime
- 1996-10-14 ES ES96933546T patent/ES2211979T3/en not_active Expired - Lifetime
- 1996-10-14 NZ NZ319674A patent/NZ319674A/en unknown
- 1996-10-15 ZA ZA968677A patent/ZA968677B/en unknown
- 1996-10-15 AR ARP960104750A patent/AR003889A1/en active IP Right Grant
- 1996-10-15 GB GB9621437A patent/GB2306323B/en not_active Expired - Lifetime
-
1998
- 1998-04-15 MX MX9802950A patent/MX9802950A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB9521101D0 (en) | 1995-12-20 |
| GB9621437D0 (en) | 1996-12-04 |
| EP0855900A1 (en) | 1998-08-05 |
| NZ319674A (en) | 1999-07-29 |
| AR003889A1 (en) | 1998-09-09 |
| GB2306323B (en) | 1998-01-14 |
| US6203784B1 (en) | 2001-03-20 |
| GB2306323A (en) | 1997-05-07 |
| ZA968677B (en) | 1997-05-21 |
| DE69631289T2 (en) | 2004-11-18 |
| BR9610930A (en) | 1999-12-21 |
| AU716159B2 (en) | 2000-02-17 |
| AU7224496A (en) | 1997-05-07 |
| DE69631289D1 (en) | 2004-02-12 |
| WO1997014397A1 (en) | 1997-04-24 |
| CA2234964A1 (en) | 1997-04-24 |
| ES2211979T3 (en) | 2004-07-16 |
| EP0855900B1 (en) | 2004-01-07 |
| MX9802950A (en) | 1998-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20161014 |