Composition, process for preparation and method of use

• US 9,498,652 B2
• Filed: 01/15/2007
• Issued: 11/22/2016
• Est. Priority Date: 01/16/2006
• Status: Active Grant

• Current Assignee: Reckitt Benckiser UK Ltd (Reckitt Benckiser Group PLC)
• Original Assignee: Reckitt Benckiser UK Ltd (Reckitt Benckiser Group PLC)
• Inventors: Moussouni, Farid, Son, Delphine, Tindal, Anne
• Primary Examiner(s): BERRIOS, JENNIFER A
• Application Number:
  US12/087,703
• Publication Number:
  US 20090049619A1
• Time in Patent Office: 3,599 Days
• Field of Search: 424/400, 8 9/416
• US Class Current: 1/1
• CPC Class Codes: A45D 26/00 Hair-singeing apparatus; Apparatus for removing superfluous hair, e.g. tweezers removing hair using electrosurgical instruments A61B18/04, A61B18/18
• CPC Class Codes: A61K 2800/87 Application Devices; Containers; Packaging
• CPC Class Codes: A61K 2800/884 Sequential application
• CPC Class Codes: A61K 8/044 Suspensions
• CPC Class Codes: A61K 8/062 Oil-in-water emulsions
• CPC Class Codes: A61K 8/342 Alcohols having more than seven atoms in an unbroken chain
• CPC Class Codes: A61K 8/46 containing sulfur A61K8/44 takes precedence
• CPC Class Codes: A61K 8/8182 Copolymers of vinyl-pyrrolidones. Compositions of derivatives of such polymers
• CPC Class Codes: A61Q 9/04 Depilatories

Abstract

Depilatory compositions comprising a depilatory agent, fatty alcohol and VP/hexadecene copolymer provide improved resistance to rinsing of the compositions from the skin. The compositions provide for a method-of depilation in wet conditions using a tool to apply and remove the compositions.

Claims

1. A depilatory composition comprising an emulsion of hydrophobic particles in a continuous aqueous phase, wherein

the continuous aqueous phase comprises a depilatory agent,

the hydrophobic particles consist of a fatty alcohol and a vinylpyrrolidone/hexadecene copolymer,

the depilatory agent is a sulfhydryl compound, and

the inclusion of a vinylpyrrolidone/hexadecene copolymer and a fatty alcohol in a hydrophobic particle provide adherence qualities of the composition to hairy skin such that the composition has a degradation period greater than three minutes, wherein the degradation period is the time the composition is left in contact with hairy skin to achieve adequate hair degradation even when rinsed or immersed in water,

the vinylpyrrolidone/hexadecane copolymer is in an amount of about 1.9% by weight of the total composition,

the vinylpyrrolidone/hexadecane copolymer has a molecular weight in the range of 6,500 to 8,500 mass units, and

the vinylpyrrolidone/hexadecane copolymer is a polymer with the structure (C₂₂H₄₁NO)_x.

2. A depilatory composition according to claim 1, comprising from 3 to 20% by weight of fatty alcohol.

3. A depilatory composition according to claim 2, wherein the fatty alcohol has an alkyl chain comprising from 8 to 22 carbon atoms.

4. A depilatory composition according to claim 1, comprising from 1 to 8% by weight of depilatory agent, expressed as the equivalent acid form of the depilatory agent.

5. A kit for hair removal comprising:

a depilatory tool, and

the depilatory composition of claim 1;

wherein the depilatory tool comprises a first side arranged to apply a depilatory composition, and a second side arranged to remove a depilatory composition, wherein the first side and the second side are substantially of a different texture and/or colour.

6. The kit of claim 5, wherein the depilatory composition comprises from 3 to 20% by weight of fatty alcohol and wherein the fatty alcohol has an alkyl chain having from 16 to 22 carbon atoms.

7. The kit of claim 5, wherein the depilatory agent comprises a cosmetically acceptable salt of thioglycolic acid and the depilatory agent comprises from 1 to 8%, by weight of the depilatory composition, expressed as an equivalent acid form of the depilatory agent.

8. A depilatory composition comprising an emulsion of hydrophobic particles in a continuous aqueous phase, wherein:

the continuous aqueous phase comprises a depilatory agent,

the hydrophobic particles consist of a fatty alcohol and hexadecene copolymer,

the depilatory agent is a sulfhydryl compound, and

the inclusion of a hexadecene copolymer and a fatty alcohol in a hydrophobic particle provide adherence qualities of the composition to an applied surface such that over 60% of the composition remains on a surface when subjected to three minutes of running water.

9. The depilatory composition of claim 8, wherein the inclusion of a hexadecene copolymer and a fatty alcohol in a hydrophobic particle provide adherence qualities of the composition to an applied surface such that over 60% of the composition remains on a surface when subjected to five minutes of running water.