US20150074923A1 - Depilatory compositions - Google Patents

Depilatory compositions Download PDF

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Publication number
US20150074923A1
US20150074923A1 US14/395,677 US201314395677A US2015074923A1 US 20150074923 A1 US20150074923 A1 US 20150074923A1 US 201314395677 A US201314395677 A US 201314395677A US 2015074923 A1 US2015074923 A1 US 2015074923A1
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United States
Prior art keywords
composition
depilatory
depilatory composition
weight
removing hair
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Abandoned
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US14/395,677
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English (en)
Inventor
Neil Atkin
Samuel Dawson
Jane Evison
Fiona Kennedy
Anne Tindal
Haydn Ward
Jane Warwick
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Reckitt and Colman Overseas Ltd
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Reckitt and Colman Overseas Ltd
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Assigned to RECKITT & COLMAN (OVERSEAS) LIMITED reassignment RECKITT & COLMAN (OVERSEAS) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WARD, Haydn, EVISON, JANE, DAWSON, Samuel, TINDAL, ANNE, WARWICK, JANE, ATKIN, NEIL, KENNEDY, FIONA
Publication of US20150074923A1 publication Critical patent/US20150074923A1/en
Abandoned legal-status Critical Current

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    • 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
    • A61K8/25—Silicon; 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
    • A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
    • A61K8/97—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives 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
    • 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
    • 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
    • A61K8/23—Sulfur; Selenium; Tellurium; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/29—Titanium; Compounds thereof
    • A—HUMAN NECESSITIES
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/31—Hydrocarbons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/34—Alcohols
    • A61K8/342—Alcohols having more than seven atoms in an unbroken chain
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    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/34—Alcohols
    • A61K8/345—Alcohols containing more than one hydroxy group
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
    • A61K8/361—Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof
    • A—HUMAN NECESSITIES
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
    • A61K8/365—Hydroxycarboxylic acids; Ketocarboxylic acids
    • A—HUMAN NECESSITIES
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/37—Esters of carboxylic acids
    • A—HUMAN NECESSITIES
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    • 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
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/42—Amides
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    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/64—Proteins; Peptides; Derivatives or degradation products thereof
    • A61K8/66—Enzymes
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    • 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
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
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    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/817—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions or derivatives of such polymers, e.g. vinylimidazol, vinylcaprolactame, allylamines (Polyquaternium 6)
    • A61K8/8182—Copolymers of vinyl-pyrrolidones. Compositions of derivatives of such polymers
    • 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
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
    • A61K8/86—Polyethers
    • 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
    • A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
    • 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
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/80—Process related aspects concerning the preparation of the cosmetic composition or the storage or application thereof
    • A61K2800/805—Corresponding aspects not provided for by any of codes A61K2800/81 - A61K2800/95
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/11—Encapsulated compositions
    • 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
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof

Definitions

  • the present invention is directed to depilatory compositions.
  • the present invention is directed to a depilatory composition that comprises a material which enables the composition to retain heat for better hair removal efficacy.
  • a depilatory composition which comprises a depilatory active and a material which alters the thermal properties of the composition by either having a higher heat of fusion or a lower thermal conductivity than the bulk.
  • the material can be in the form of a phase changing material, a micro-encapsulated phase changing material, or a silica or silicate-based insulator.
  • the phase changing material can be selected from organic, inorganic materials or mixtures thereof.
  • the phase changing material is selected from the group consisting of a mixture of saturated hydrocarbons, fatty acids, fatty alcohols or esters thereof.
  • the encapsulated phase-changing material can be based on these materials and encapsulated in a suitable polymer shell, encapsulated phase change materials can be selected from saturated hydrocarbons, fatty acids, fatty alcohols, fatty esters or hydrated inorganic salts.
  • Non limiting examples of suitable non-paraffin organic materials include Lauryl bromide, Cetyl alcohol, Stearyl alcohol, Palmatic acid, Pentadecanoic acid, Lauric acid.
  • the silica-based insulator can be selected from silica aerogels or fumed silica.
  • Silicate-based materials can be selected from a mica, a clay such as bentonite or kaolin.
  • composition can further include a co-polymer, such as vinyl pyrrolidone/hexadecene co-polymer.
  • a co-polymer such as vinyl pyrrolidone/hexadecene co-polymer.
  • the composition can be in the form of a cream, lotion or a gel.
  • the depilatory composition may contain a skin-feel enhancing agent selected from at least one of silicone wax, talc and polyamide resin in the depilatory cream composition.
  • a skin-feel enhancing agent selected from at least one of silicone wax, talc and polyamide resin in the depilatory cream composition.
  • the silicone wax, talc and/or a polyamide resin impart(s) a soft and velvety after-feel to the depilatory cream composition without affecting the composition's hair removal properties.
  • the talc is particularly preferred over other minerals which have previously been used in cosmetics as it confers a powdery after-feel which is desirable. In addition, it does not alter the colour of the composition.
  • the talc may be present in an amount of 0.1 to 10 weight %, preferably 0.2 to 5 weight %, more preferably 0.5 to 3 weight %. In one embodiment, the composition includes 1 to 2 weight % talc.
  • the depilatory composition may further include a humectant.
  • Suitable humectants include polyols, such as glycerine, propylene glycol and butylene glycol. Glycerine is preferred.
  • the humectant may be present in an amount of 0 to 10 weight %, preferably 0.5 to 5 weight %.
  • the composition may comprise a polyamide resin as an alternative or in addition to the mineral.
  • the polyamide resin may be present in an amount of 0.1 to 10 weight %, preferably 0.5 to 5 weight %, more preferably 1 to 3 weight %, for example 2 weight %.
  • the polyamide resin is preferably Nylon-12.
  • the composition may also comprise a silicone wax as an alternative or in addition to the mineral and/or polyamide resin.
  • Suitable silicone waxes include C 30 -C 45 alkyl methicone and a silicone wax formed from stearoxytrimethylsilane and stearyl alcohol.
  • the silicone wax is preferably C 30 -C 45 alkyl methicone.
  • the silicone wax may be present in an amount of 0.1 to 10 weight %, preferably 0.5 to 5 weight %, more preferably 1 to 3 weight %, for example 1 to 2 weight %.
  • the emollient is selected from at least one of mineral oil, silicone and emollient esters. Together with the silicone wax, mineral and/or polyamide resin (and optional humectant), the emollient plays an important role in providing the depilatory cream composition with its desired skin-feel characteristics.
  • the emollient may be present in an amount of 1 to 10 weight %, preferably 3 to 7 weight % of the composition.
  • Mineral oil may be present in an amount of 0 to 10 weight %, preferably 0.5 to 5 weight % of the composition.
  • Silicone oil may be present in an amount of 0 to 10 weight %, preferably 0.5 to 5 weight %, for example 1 to 4 weight % of the composition.
  • Emollient esters may be present in an amount of 0 to 10 weight %, preferably 0.5 to 5 weight % of the composition, for example 1 to 3 weight %.
  • the emollient in one embodiment, includes talc and an emollient that consists essentially of mineral oil.
  • the emollient is present in an amount of 3 to 6 weight %, preferably 5 weight %.
  • the talc is present in an amount of 0.3 to 1 weight %, preferably 0.5 weight %.
  • the composition preferably includes a humectant, such as glycerine.
  • the emollient may comprise or consist essentially of silicone oil(s).
  • a combination of silicone oils are present.
  • the silicone oil may include at least one of cyclopentasiloxane, dimethiconol and dimethicone.
  • the silicone oil comprises cyclopentasiloxane, dimethiconol and dimethicone.
  • the silicone oil may include 0.1 to 5 weight %, preferably 1 to 2 weight % dimethicone; and/or to 5 weight %, for example, 1 to 3 weight % cyclopentasiloxane and dimethiconol.
  • the emollient it is possible for the emollient to consist essentially of an emollient ester.
  • the emollient ester is preferably used in combination with a mineral oil and/or a silicone oil.
  • the emollient comprises at least two of mineral oil, silicone oil and emollient esters.
  • the emollient may include mineral oil and silicone oil, or mineral oil and emollient esters, or silicone oil and emollient esters.
  • the emollient includes mineral oil, silicone oil and emollient esters.
  • silicone oil examples include cyclopentasiloxane, dimethiconol and dimethicone.
  • the total amount of silicone oil in the composition may be 0.1 to 10 weight %, for example, 2 to 5 weight %.
  • emollient ester Any suitable emollient ester may be employed. Suitable examples include isopropyl palmitate, isopropyl myristate, myristyl lactate, cetyl esters, isotridecyl isononanoate, C 12-15 alkyl benzoate, caprylic/capric triglyceride and pentaerythrityl tetraisostearate.
  • the emollient comprises mineral oil.
  • the mineral oil may be present in an amount of 3 to 6 weight %, preferably 5 weight %. In a preferred embodiment, this combination of emollients is used together with at least one of talc and polyamide resin.
  • the depilatory active is a compound capable of degrading keratin and may be, for example, a sulphur compound such as potassium thioglycolate, dithioetythritol, thioglycerol, thioglycol, thioxanthine, thiosalicylic acid, N-acetyl-L-cysteine, lipic acid, NaHSO 3 , Li 2 S, Na 2 S, K 2 S, MgS, CaS, SrS, BaS, (NH 4 ) 2 S, sodium dihydrolipoate 6,8-dithiooctanoate, sodium 6,8-dithiooctanoate, salts of hydrogen sulphide for example NaSH or KSH, thioglycolic acid, thioglycerol, 2-mercaptopropionic acid, 3-mercaptropropionic acid, thiomalic acid, ammonium thioglycolate, gly
  • Preferred depilatory compounds are thioglycolates, or their precursor thioglycolic acid. Most preferred is potassium thioglycolate, which may be produced by mixing thioglycolic acid with a neutralising source of potassium hydroxide (as noted above excess potassium hydroxide over that required to effect neutralisation cannot be used).
  • the depilatory active may be present in an amount of 2 to 25 weight %, preferably 5 to 20 weight %, more preferably 10 to 15 weight %.
  • the composition includes potassium thioglycolate in an amount of 2 to 25 weight %, preferably 5 to 20 weight %, more preferably 10 to 15 weight %.
  • the depilatory composition of the present invention preferably includes water.
  • Water may be present in an amount of at least 40 weight %, preferably at least 50 weight %. Suitable amounts of water range from 40 to 70 weight %, preferably 50 to 65 weight %, more preferably 55 to 60 weight %.
  • the depilatory composition may optionally include one or more surfactant(s).
  • the surfactant may be anionic, cationic or non-ionic. It is preferably non-ionic.
  • suitable surfactants include cetearyl phosphate, cetearyl alcohol, cetearyl glucoside, cetostearyl alcohol and/or ceteareth 20. It is preferably present in an amount of from 0.5 to 15 wt % relative to the weight of the depilatory composition, more preferably from 1 to 10 wt %.
  • the depilatory composition can be provided with a combination of components selected from saturated hydrocarbons, vinylpyrrolidone/hexadecane co-polymer, fatty acids, fatty alcohols, esters and surfactants which on heating act to enable the composition to have an improved cooling profile.
  • the depilatory combination can include a combination of cetearyl alcohol, ceteareth 20 and a copolymer of vinylpyrrolidone and hexadecane. Typically, this preferred combination is present at a level of at least 9%. More typically, the preferred combination is present at a level of at 9.5-10%.
  • the depilatory composition may optionally include a source of alkalinity.
  • a source of alkalinity may include hydroxides, such as hydroxides of alkali and alkaline earth metals. Suitable hydroxides include sodium hydroxide, potassium hydroxide, calcium hydroxide and magnesium hydroxide. Preferably, calcium hydroxide is employed, optionally together with potassium hydroxide.
  • the source of alkalinity e.g. calcium hydroxide
  • the depilatory composition preferably has a pH of greater than 7, for example, 9 to 12.5.
  • the composition includes an accelerator that will accelerate the hair removal reaction.
  • accelerators include urea, thiourea, dimethyl, isosorbide (DMI), ethoxydiglycol (Transcutol) or methyl propyl diol (MP diol).
  • the accelerator is urea.
  • the composition according to the invention preferably comprises from 5% to 15% wt, more preferably from 6 to 10 wt % of an accelerator (e.g. urea).
  • the depilatory composition may comprise other optional ingredients, such as pigments and fillers, such as clays.
  • suitable clays include sodium magnesium silicate, magnesium trisilicate and titanium dioxide.
  • the depilatory cream composition desirably includes a chelating agent, such as sodium gluconate.
  • a chelating agent such as sodium gluconate.
  • the chelating agent may be present in an amount of less than 1 weight %, preferably 0.01 to 0.5 weight %, for example 0.05 to 0.1 weight %.
  • the depilatory cream composition may also include an additive that prevents phase separation.
  • Suitable additives include polymers or copolymers of acrylic acid, for example, an acrylate copolymer. Such additives may be present in an amount of up to 2 weight %, preferably less than 1 weight %, more preferably less than 0.5 weight %, for example 0.1 to 0.4 weight %.
  • additives such as aloe vera, lotus flower milk and Vitamin E may also be included in the composition.
  • additives are employed in amounts of less than 1 weight %, for example, 0.1 to 0.5 weight % of the composition.
  • the composition can be in the form of a base cream, an aerosol cream or a shower cream.
  • the residence time is less than 10 minutes, more preferably not more than 6 minutes, even. Very suitably the residence time is 1 to 5 minutes, about 2 to 3 minutes being especially preferred.
  • a method of removing hair from the skin comprising the steps of (a) applying heat to a depilatory composition which comprises a combination of components selected from saturated hydrocarbons, vinylpyrrolidone/hexadecane co-polymer, fatty acids, fatty alcohols, esters and surfactants which on heating act to enable the composition to have an improved cooling profile; and (b) applying said heated depilatory composition to an area of the skin.
  • a depilatory composition which comprises a combination of components selected from saturated hydrocarbons, vinylpyrrolidone/hexadecane co-polymer, fatty acids, fatty alcohols, esters and surfactants which on heating act to enable the composition to have an improved cooling profile
  • the depilatory composition is heated to a temperature of 40° C.-60° C. More typically, the temperature is 45° C.-55° C. Most typically, the temperature is 55° C.
  • the depilatory composition can retain its heat for a period of up to 15 mins. Typically, the depilatory composition can retain its heat for a period of up to 12 mins.
  • the depilatory composition cools to a temperature of 32° C.-35° C. over a period of 10-15 mins.
  • a preferred combination is cetearyl alcohol, ceteareth 20 and a copolymer of vinylpyrrolidone and hexadecane. Typically, this preferred combination is present at a level of at least 9%. More typically, the preferred combination is present at a level of at 9.5-10%.
  • a heated depilatory composition which comprises a combination of components selected from saturated hydrocarbons, vinylpyrrolidone/hexadecane co-polymer, fatty acids, fatty alcohols, esters and surfactants which on heating act to enable the composition to have an improved cooling profile for the removal of hair from the skin
  • the depilatory composition is heated to a temperature of 40° C.-60° C. More typically, the temperature is 45° C.-55° C. Most typically, the temperature is 55° C.
  • the depilatory composition can retain its heat for a period of up to 15 mins. Typically, the depilatory composition can retain its heat for a period of up to 12 mins.
  • the depilatory composition cools to a temperature of 32° C.-35° C. over a period of 10-15 mins.
  • a preferred combination is cetearyl alcohol, ceteareth 20 and a copolymer of vinylpyrrolidone and hexadecane.
  • this preferred combination is present at a level of at least 9%. More typically, the preferred combination is present at a level of at 9.5-10%.
  • FIG. 1 illustrates a comparison of hair removal efficacy on consumers at different temperature with different removal times
  • FIG. 2 illustrates hair swelling measurements at different temperatures after 1 minute
  • FIG. 3 illustrates the temperature profile of depilatory creams on the arm in an individual
  • FIG. 4 illustrates hair removal efficacy from an in-vitro test method
  • FIG. 5 illustrates the cooling profile of Example 8 in accordance with the present invention
  • FIG. 6 illustrate the heat retention properties of Example 8 in accordance with the present invention
  • FIG. 7 illustrates the heat retention properties of a standard composition as a comparison
  • FIG. 8 illustrates an exotherm analysis of Example 8 in accordance with the present invention and a standard cream
  • compositions can be formulated using standard techniques known to the man skilled in the art.
  • Phase changing materials are compounds which melt and solidify at certain, specific temperatures. As the solid material is heated it absorbs energy, at melting point it absorbs a greater amount of energy which is stored until the material cools back below its melting point. As the temperature drops below the phase change materials melting point the stored energy is released. The amount of energy able to be stored is dependant of the PCM's latent heat capacity. These materials were exploited so that when the depilatory cream was warmed, heat was stored and then released once the cream was cooled down at the particular PCM's operating temperature range.
  • Aerogel is a material principally made from silica; an electrochemical separation process is used in its production to remove the liquid in silica gel and replace it with a gas. Aerogel is predominantly used for different applications including as a thickening agent in cosmetics and paints.
  • Fumed silica is made from the continuous flame hydrolysis of silicon tetrachloride. Fumed Silica is also used for its thickening properties in cosmetic and pharmaceuticals. This silica derivative should exhibit similar insulating properties to Aerogel.
  • MPCMs Microencapsulated phase change materials
  • Parafol is another example of a phase change wax that can be used. It has a particularly high latent heat capacity but does result in a significant reduction in viscosity of the final formulation when heated above 45° C.
  • FIG. 1 illustrates that when a standard hot depilatory cream is applied to the legs there was not significant difference in hair removal efficacy compared to the cold cream. While not wishing to be bound by any theory, it is believed that this is because the hot cream cools down quickly on the leg negating any benefits the heat would provide.
  • a second in-vitro test looks at how quickly hairs swell.
  • the amount of swelling is an indication of keratin damage and correlates to hair removal efficacy.
  • the results, which are illustrated in FIG. 2 show that after 1 minute the hair swells more at 50° C. than at cooler temperatures. Therefore if the temperature of the cream can be maintained on the leg for around one minute the benefit of the heat should be seen in-vivo.
  • FIG. 3 shows depilatory creams modified with either PCM or either of the silica slows the rate of cooling. Despite all creams being heated to the same amount the temperature of the cream does vary from the initial measurement. This could be because some creams are losing heat rapidly in the first 10 seconds after application.
  • FIG. 4 shows all the heated creams removed hair much more effectively than the room temperature cream. There are differences between the heated creams with a slight loss of efficacy at higher leaves of silica and with the PCM. Without being bound by theory, it is believed that this is because there is a larger proportion of non-aqueous matter in the formulation which does not directly contribute to the aqueous hair removal reaction.
  • FIGS. 5 and 6 illustrate the heat retention properties of Example 8.
  • the results shown in these Figures demonstrate that the heat-retaining depilatory formulation which comprises a combination of components selected from vinylpyrrolidone/hexadecene co-polymer, saturated hydrocarbons, fatty acids, fatty alcohols, esters and surfactants retains heat for longer compared with a standard cream formulation that does not include this combination ( FIG. 7 ).
  • FIG. 8 illustrates an exotherm analysis which provides further support to the theory of better heat retention in the heated depilatory formulation. It shows the heat-retaining formulation emits the most heat on cooling and therefore is the slowest cooling.
  • An advantage of the present invention is that there is provided a depilatory cream whose efficacy is increased by pre-warming it. Additional advantages of the pre-warmed cream are based around the sensory feel it provides to the consumer.

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GBGB1207493.6A GB201207493D0 (en) 2012-04-26 2012-04-26 Novel depilatory compositions
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PCT/GB2013/051064 WO2013160689A2 (en) 2012-04-26 2013-04-26 Novel depilatory compositions

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FR3043909B1 (fr) * 2015-11-23 2017-12-22 Chanel Parfums Beaute Composition cosmetique comprenant au moins une poudre presentant une faible conductivite thermique.

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US20090068119A1 (en) * 2005-10-14 2009-03-12 Lee Cawthorne Sprayable Depilatory Composition and a Method of use
WO2009090362A1 (en) * 2008-01-14 2009-07-23 Reckitt Benckiser (Uk) Limited Depilatory composition comprising hydrophobic particles, process for preparation and method of use
US20100083443A1 (en) * 2007-03-09 2010-04-08 Reckitt & Colman (Overseas) Limited Depilatory Composition
WO2010082024A2 (en) * 2009-01-15 2010-07-22 Reckitt & Colman (Overseas) Limited Topical composition

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EP0096521A3 (de) * 1982-06-01 1985-01-23 THE PROCTER & GAMBLE COMPANY Enthaarungsmittel
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AU2517495A (en) * 1994-06-09 1996-01-04 Procter & Gamble Company, The Depilatory compositions comprising sulfhydryl compounds
US20060269489A1 (en) * 2005-05-26 2006-11-30 Adamy Steven T Depilatory compositions
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GB0600788D0 (en) * 2006-01-16 2006-02-22 Reckitt Benckiser Uk Ltd Composition, process for preparation and method of use
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US4088751A (en) * 1972-04-07 1978-05-09 Colgate-Palmolive Company Self-heating cosmetic
US20050255134A1 (en) * 2003-12-01 2005-11-17 Degussa Ag Brushable cosmetic preparation having a high water content
WO2005123022A1 (en) * 2004-06-15 2005-12-29 Reckitt Benckiser (Uk) Limited Improvements in or relating to depilatory compositions
US20090068119A1 (en) * 2005-10-14 2009-03-12 Lee Cawthorne Sprayable Depilatory Composition and a Method of use
US20070202185A1 (en) * 2005-12-28 2007-08-30 Kimberly-Clark Worldwide, Inc. Microencapsulated Delivery Vehicles Having Fugitive Layers
US20100083443A1 (en) * 2007-03-09 2010-04-08 Reckitt & Colman (Overseas) Limited Depilatory Composition
WO2009090362A1 (en) * 2008-01-14 2009-07-23 Reckitt Benckiser (Uk) Limited Depilatory composition comprising hydrophobic particles, process for preparation and method of use
WO2010082024A2 (en) * 2009-01-15 2010-07-22 Reckitt & Colman (Overseas) Limited Topical composition

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ZA201407604B (en) 2016-03-30
GB201307569D0 (en) 2013-06-12
GB201207493D0 (en) 2012-06-13
RU2638816C2 (ru) 2017-12-15
WO2013160689A2 (en) 2013-10-31
MX2014012940A (es) 2015-03-04
EP2844351A2 (de) 2015-03-11
WO2013160689A3 (en) 2014-10-16
BR112014026609A2 (pt) 2017-06-27
US20170224610A1 (en) 2017-08-10
RU2014147559A (ru) 2016-06-20
GB2502885A (en) 2013-12-11
EP2844351B1 (de) 2018-05-23

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