GB2325936A - Aerosol shaving foam - Google Patents

Aerosol shaving foam Download PDF

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Publication number
GB2325936A
GB2325936A GB9711764A GB9711764A GB2325936A GB 2325936 A GB2325936 A GB 2325936A GB 9711764 A GB9711764 A GB 9711764A GB 9711764 A GB9711764 A GB 9711764A GB 2325936 A GB2325936 A GB 2325936A
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United Kingdom
Prior art keywords
composition
formulation
present
foam
soap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9711764A
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GB9711764D0 (en
Inventor
Shahid Malek
Paul Roberts
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9711764A priority Critical patent/GB2325936A/en
Publication of GB9711764D0 publication Critical patent/GB9711764D0/en
Publication of GB2325936A publication Critical patent/GB2325936A/en
Withdrawn legal-status Critical Current

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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
    • A61Q9/02—Shaving preparations
    • 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
    • A61K8/0241—Containing particulates characterized by their shape and/or structure
    • A61K8/0279—Porous; Hollow
    • 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
    • A61K8/04—Dispersions; Emulsions
    • A61K8/046—Aerosols; Foams
    • 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
    • A61K8/04—Dispersions; Emulsions
    • A61K8/06—Emulsions
    • A61K8/062—Oil-in-water emulsions
    • 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
    • A61K8/34—Alcohols
    • A61K8/345—Alcohols containing more than one hydroxy group
    • 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
    • A61K8/88—Polyamides
    • 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
    • A61K8/89—Polysiloxanes
    • A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
    • A61K8/894—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Birds (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Emergency Medicine (AREA)
  • Dermatology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Cosmetics (AREA)

Abstract

An aerosol shaving foam of excellent lubricity, adherence to skin, razor glide and comfort of shave delivered via a creamy foam is produced from an aqueous formulation comprising a fatty acid soap a secondary synthetic anionic surfactant, a film former and a porous polyamide powder (Nylon). Inclusion of Glycerine and Silicone further increase the quality of foam and comfort of shave. The formulation encompassing the above is delivered via the following two routes: (I) Oil-in-water emulsion type formulation. (II) Oil-free type formulation.

Description

BACKGROUND OF THE INVENTION Aerosol shaving foam technology involves the delivery and application of a high foam system to the skin (in most cases it is soap based), in order to ease the removal of unwanted facial or bodily hair with the use of a razor blade.
Shave foams provide a more comfortable medium for a wet shave.
The instant invention relates to shaving foam of similar aesthetics to the most widely used aerosol shaving preparations available on the market. The invention refers to a new formulation containing a unique active system to help provide a smoother / more comfortable shave.
DESCRIPTION OF THE INVENTION This invention relates to an aerosol shaving foam comprising aqueous formulations packaged in a suitable tin-plate or aluminium can. Creamy foam produced has better adherence properties than that of a shaving gel.
Good lubricity / razor glide as well as an outstandingly smooth and comfortable shave is delivered by the incorporation of a unique active system.
The essential component of the unique active system of the instant invention is about 0.5 - 3.0% by weight of a porous polyamide powder, namely Nylon-12. Other components forming part of the active system are also the emollients of the composition, comprising about 1.0 - 5.0% Glycerin, 0.1 - 1.5% of a Dimethicone copolyol and 65 - 85% purified water.
The Nylon-12 which is obtained by the direct polymerisation of Lactame monomers, is more or less a porous spherical polyamide powder.
The powder has a primary skin irritation index = 0, and is perfectly accepted by the human body, whether it be for skin contact or for implants.
The innovative step of using this material in an aqueous shaving foam formulation is the fact that although it has the ability to improve lubricity / razor glide due to its spherical nature, it also has a microporous structure which gives it special absorption and desorption properties. By absorbing some of the composition, particularly the said emollients, they can then be pressure released (by the razor) at the point of shave and hence providing further lubrication and enhancing the comfort of shave, i.e. hair removal is carried out with ease, minimising razor drag.
The surfactant / foam production components of the formulation include an alkanolamine soap namely an ethanolamine palmitate and a secondary synthetic anionic surfactant, being the sodium salt of N-acyl sarcosine namely Sodium Lauroyl Sarcosinate. The soap is present from about 8.0 - 17.0 % of the composition. The anionic surfactant should comprise about 0.5-5% of the total composition. The anionic surfactant also functions as a wetting agent and a corrosion inhibitor for both the container and razor blade.
In addition to this another essential part of the composition is the foam stabilising component which comprises the following; Cetyl Alcohol; Lauramide DEA and a film former.
The most essential foam stabilising component relating to this invention is the film former, namely Acrylates/octylacrylamide copolymer. It is a hydrophobic, high molecular weight, carboxylated acrylic copolymer. The polymer is insoluble in water however becomes water-soluble on neutralising the carboxyl groups with a suitable water-soluble base, such as triethanolamine. This polymeric additive ultimately enhances foam stability by increasing the bulk viscosity and slowing down drainage. Its film forming properties will also help maintain active ingredients on site of application.
The formation of a foam from a bulk liquid involves the expansion of the surface area due to the work acting on the system. As surface tension is the work involved in creating the new system, then the amount of new area formed (that is, the foam) will be greater when the surface tension is lower.
Thus, the reduction in surface tension by the surfactant is the primary requirement of foam formation.
Foam consists of a thermodynamically unstable two-phase system of gas bubbles in liquid. Foam is generated by gas forming spheres in the liquid (spherical foam), but this then forms honeycomb foam with relatively thick lamellae between the cells. The pressure difference is proportional to the surface tension. The lower the surface tension, the lower the pressure difference and lower the drainage - hence more stable the foam. Foams are destroyed when the liquid drains from the lamellae, causing them to become thinner. At a certain critical thickness the film collapses and the bubble bursts.
Hence although the foam stability depends on a number of factors such as surfactant type, temperature, presence of an electrolyte, the film forming polymeric additive plays an important role with regards to foam stability.
Other essential components not directly related to the present invention however form an essential part of the formulation are; purified water; an oil-in-water emulsifier of HLB 15-20; emollients/skin moisturisers and a suitable gaseous propellant preferably a blend of Butane, Isobutane, Propane of vapour pressure 38-42 Psig at 70 F. The propellant not only dispenses the product from the can but also converts the concentrate to a foam.
The fatty alcohol and fatty alkanolamide impart body to the formulation.
The shaving foam concentrate is composed of an oil-in-water emulsion, hence a suitable emulsifier is used of high HLB value, Laureth-23 is particularly preferred, others include; Oleth-20 (HLB 15.5), Polysorbate20 (HLB 16.7), PEG-40 Laurate (HLB 16.9), Cetoleth-19 (HLB 17.5) and Sodium Stearoyl Lactylate (HLB 20.0).
Given as follows are illustrative examples of the shaving foam formulations according to the invention: (Examples shown are non-limiting to the overall invention).
RAW MATERIAL % Inclusion Concentrate I II III IV V VI VII Aqua 69.50 69.50 69.50 69.50 69.50 69.50 76.33 Aloe Barbadensis 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Glycerin 3.00 3.00 3.00 3.00 3.00 3.00 3.00 Sodium Lauroyl Sarcosinate(35) 2.00 2.00 2.00 2.00 2.00 2.00 2.00 Dimethicone Copolyol 0.50 0.50 0.50 0.50 0.50 0.50 0.50 Acrylates/octylacrylamide copolymer 0.50 0.50 0.50 0.50 0.50 0.50 0.50 Sodium methylparaben 0.10 0.10 0.10 0.10 0.10 0.10 0.10 Triethanolamine(99) 5.19 5.19 5.19 5.19 5.19 5.19 3.00 Nylon-12 0.80 0.80 0.80 0.80 0.80 0.80 0.80 Palmitic Acid(99) 11.00 11.00 11.00 11.00 11.00 11.00 6.36 Lauramide DEA 0.50 0.50 0.50 0.50 0.50 0.50 0.50 Cetyl Alcohol 1.50 1.50 1.50 1.50 1.50 1.50 1.50 ParaffinumLiquidum 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Laureth-23 3.00 3.00 Oleth-20 3.00 Cetoleth-1 9 3.00 PEG40 Laurate 3.00 Sodium Stearoyl Lactylate 3.00 Polysorbate-20 3.00 1rropylpsn 0.10 0.10 0.10 0.10 0.10 0.10 0.10 Methyldibromo Glutaronitrile, Dipropylene Glycol 0.20 0.20 020 0.20 0.20 0.20 0.20 Allantoin 0.10 0.10 0.10 0.10 0.10 0.10 0.10 BHT 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Concentrate 96.20 96.20 96.20 96.20 96.20 96.20 96.20 Pam 0.30 0.30 0.30 0.30 0.30 0.30 0.30 Butane,Isobutane,Propane 3.50 3 S0 3.50 3.50 3.50 3.50 3.50 Example VIII RAW MATERIAL % Inclusion Aqua 66.59 Glycerin 5.00 Sodium Lauroyl Sarcosinate(35) 2.50 Dimethicone Copolyol 0.50 Acrylatesloctylacrylamide copolymer 0.50 Sodium methylparaben 0.10 Triethanolamine(99) 4.80 Nylon-12 1.00 Palmitic Acid(99) 10.00 Lauramide DEA 0.50 Cetyl Alcohol 3.20 Paraffinum Liquidum 1.00 Laureth-23 4.00 Propylparaben 0.10 Methyldibromo Glutaronitrile, Dipropylene Glycol 0.20 BHT 0.01 Concentrate 96.20 Parfum 0.30 Butane,Isobutane,Propane 3.50 The formulation is manufactured as follows:1. Purified water is heated to 70-75 "C.
2. Each water phase ingredients added in turn, mixed and dispersed.
3. Oil phase ingredients mixed together in a separate vessel and heated to 70"C till a clear homogenous liquid is obtained.
4. Oil phase added to water phase slowly with constant mixing.
5. Allowed to mix for 30-45 minutes.
6. Cooled to 40 "C then Allantoin and BHT mixed in.
7. Cooled to room temperature.
8. Fragrance mixed in.* 9. Filled off into aerosol cans along with propellant.
* Fragrance can either be mixed into the concentrate or microdosed into the aerosol can.
OIL - FREE TYPE Purely an aqueous based concentrate free from any oils, composed of the following: 70-80% purified water; 0.5-3.0% of a porous polyamide powder, namely Nylon-12; 0.5-2.0 % Polyacrylamide; 8.0 -17.0% of a alkanolamine soap namely ethanolamine palmitate; 0.5-5.0 % of an anionic surfactant namely Sodium Lauroyl Sarcosinate; 0.5-5.0% Glycerin; 0.5-3.0% PEG-32; 0.5-5.0% Sucrose Cocoate; 0.0-1.0% Hydroxypropyl guar.
Being completely water based, it is difficult to produce a foam with a creamy consistency as with traditional shaving foams. This is achieved to an extent via the Sucrose Cocoate and PEG-32 which impart body to the foam.
The polyacrylamide increases the bulk viscosity of the product and acts as a film former imparting good foam stability. Glycerin gives the apparent creamy texture and provides good emolliency. The backbone of the formulation is the same as the oil-in-water emulsion type as described earlier.
Given as follows are illustrative examples of the oil free shaving foam formulations according to the invention: (The examples are non-limiting to the overall invention) RAW MATERIAL % Inclusion Concentrate IX X XI XII Phase A Aqua 31.13 24.39 32.43 25.69 Polyacrylamide 1.50 1.50 1.50 1.50 Hydroxypropyl guar 0.50 0.50 Phase B Aqua 47.00 47.00 45.00 45.00 Sodium Lauroyl Sarcosinate(35) 3.00 3.00 3.00 3.00 Palmitic Acid(99) 6.36 11.00 6.36 11.00 Glycerin 3.00 3.00 3.00 3.00 PEG-32 1.00 1.00 1.00 1.00 Sucrose Cocoate 3.00 3.00 3.00 3.00 Triethanolamine (99) 3.00 5.10 3.00 5.10 Methyldibromo Glutaronitrile, 0.20 0.20 Dipropylene Glycol Nylon-12 1.00 1.00 1.00 1.00 BHT 0.01 0.01 0.01 0.01 Concentrate 96.50 96.50 96.50 96.50 Butane, Isobutane, Propane 3.50 3.50 3.50 3.50 Method of Manufacture.
1. Purified water (phase B quantity) heated to 70-750C.
2. Other phase B ingredients mixed till dispersed.
3. Allow to mix for 30-45 minutes.
4. Phase A made up by hydrating polymer in water.
5. Phase B cooled to about 30-40"C then mixed into gel phase A.
6. Mixed till a homogenous phase is obtained.
7. BHT mixed in.
8. Filled off into aerosol cans along with propellant.

Claims (25)

Claims
1. An aerosol dispensed shaving foam / cream comprising an aqueous formulation in the form of an oil-in-water emulsion containing soap, a secondary synthetic anionic surfactant, a porous polyamide powder and a film former.
2. A composition as claimed in claim 1 in which the soap is an ethanolamine palmitate.
3. The composition as claimed in claim 2 in which the soap is present from about 8.0-17.0% of the formulation.
4. The composition as claimed in claim 1 in which the porous polyamide powder is Nylon-12.
5. The composition as claimed in claim 4 in which the polyamide powder is present from about 0.5-3.0% ofthe formulation.
6. The composition as claimed in claim 1 in which the foam stabilising components are included.
7. The composition as claimed in claim 6 in which the foam stabilising components comprises; Cetyl alcohol; Lauramide DEA and a film former.
8. The composition as claimed in claim 7 in which the said film former is Acrylates/octylacrylamide copolymer and is present from about 0.5-1.0% of the formulation.
9. The composition as claimed in claim 1 in which a secondary anionic surfactant is also present at 0.5-5.0% of the formulation.
10. The composition as claimed in claim 9 in which the said anionic surfactant is Sodium Lauroyl Sarcosinate.
11 .The composition as claimed in claim 1 in which 2.5-7.5% of emollients are also present.
12. The composition as claimed in claim 11 in which the said emollients include about 0.1-1.5% of a Dimethicone copolyol and 1.0-5.0% Glycerin.
13 Purified water is used to form 65-85% of the formulation.
14.An oil-free aerosol dispensed shaving foam formulation comprising soap, a porous polyamide powder, a secondary anionic surfactant and upto two film former/thickeners.
15.A composition as claimed in claim 14 in which the soap is an ethanolamine palmitate.
16. The composition as claimed in claim 15 in which the soap is present from about 8.0-17.0% ofthe formulation.
17. The composition as claimed in claim 14 in which the porous polyamide powder namely Nylon-12 is present from about 0.5-3.0% of the formulation.
18. The composition as claimed in claim 14 in which the film former/thickeners include Polyacrylamide and / or including Hydroxypropyl guar.
19.The composition as claimed in claim 18 in which the Polyacrylamide is present from about 0.5-2.0% of the formulation and the Hydroxypropyl guar is present from about 0.0-1.0% of the formulation.
20.The composition as claimed in claim 14 in which the said secondary anionic surfactant is Sodium Lauroyl Sarcosinate.
21. The composition as claimed in claim 20 in which the Sodium Lauroyl Sarcosinate is present from about 0.5-5.0% of the formulation.
22.The composition as claimed in claim 14 in which bodyfying /foam stabilising components are also present, namely PEG-32 present from about 0.5-3.0% and Sucrose Cocoate present from about 0.5-5.0% of the formulation.
23.The composition as claimed in claim 14 in which 1.0-5.0% emollient is also present namely Glycerin.
24.Purified water is used to form 70-80 % of the composition.
25.The composition as claimed in any one of the preceding claims in which skin soothing agents are also present such as Allantoin and Aloe vera.
GB9711764A 1997-06-07 1997-06-07 Aerosol shaving foam Withdrawn GB2325936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9711764A GB2325936A (en) 1997-06-07 1997-06-07 Aerosol shaving foam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9711764A GB2325936A (en) 1997-06-07 1997-06-07 Aerosol shaving foam

Publications (2)

Publication Number Publication Date
GB9711764D0 GB9711764D0 (en) 1997-08-06
GB2325936A true GB2325936A (en) 1998-12-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002087519A2 (en) * 2001-04-30 2002-11-07 The Gillette Company Shaving compositions containing highly lubricious water soluble polymers
DE10252396A1 (en) * 2002-11-12 2004-05-27 Beiersdorf Ag Cosmetic cleaning composition containing alkali soaps, useful for cleaning skin, hair and nails, includes polyacrylate as thickener to improve temperature stability
WO2005094764A1 (en) * 2004-03-12 2005-10-13 The Gillette Company Shave gel products
GB2414485A (en) * 2004-05-27 2005-11-30 Knowledge & Merchandising Inc Shaving composition
FR2902651A1 (en) * 2006-06-23 2007-12-28 Oreal Soap-free auto-foaming shaving gel, comprises aqueous phase, N-acylsarcosine, mineral or organic base of which quantity is sufficient for solubilizing the N-acylsarcosine, anionic surfactant, non-ionic surfactant and auto-foaming agent
WO2008037609A1 (en) * 2006-09-28 2008-04-03 Unilever Plc Mild foaming personal cleansing composition with high levels of hydrocarbon wax and oil emollients
FR2911269A1 (en) * 2007-01-17 2008-07-18 Oreal Soapless shaving foam composition for aerosol dispensers, contains aqueous phase, N-acyl-sarcosine, mineral or organic base, 14-18C linear saturated fatty acid, non-ionic surfactant and propellant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2114580A (en) * 1982-02-16 1983-08-24 Oreal Composition intended for treating the hair skin or nails containing at least one cationic polymer and at least one anionic latex
EP0770373A1 (en) * 1995-10-25 1997-05-02 L'oreal Cosmetic composition containing a monoester of a C4-C10 acid with a C16-C18 alcohol and hollow particles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2114580A (en) * 1982-02-16 1983-08-24 Oreal Composition intended for treating the hair skin or nails containing at least one cationic polymer and at least one anionic latex
EP0770373A1 (en) * 1995-10-25 1997-05-02 L'oreal Cosmetic composition containing a monoester of a C4-C10 acid with a C16-C18 alcohol and hollow particles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002087519A2 (en) * 2001-04-30 2002-11-07 The Gillette Company Shaving compositions containing highly lubricious water soluble polymers
WO2002087519A3 (en) * 2001-04-30 2004-04-29 Gillette Co Shaving compositions containing highly lubricious water soluble polymers
DE10252396A1 (en) * 2002-11-12 2004-05-27 Beiersdorf Ag Cosmetic cleaning composition containing alkali soaps, useful for cleaning skin, hair and nails, includes polyacrylate as thickener to improve temperature stability
WO2005094764A1 (en) * 2004-03-12 2005-10-13 The Gillette Company Shave gel products
GB2414485A (en) * 2004-05-27 2005-11-30 Knowledge & Merchandising Inc Shaving composition
FR2902651A1 (en) * 2006-06-23 2007-12-28 Oreal Soap-free auto-foaming shaving gel, comprises aqueous phase, N-acylsarcosine, mineral or organic base of which quantity is sufficient for solubilizing the N-acylsarcosine, anionic surfactant, non-ionic surfactant and auto-foaming agent
EP1872830A1 (en) * 2006-06-23 2008-01-02 L'oreal Soap-free, self-foaming shaving gel based on N-acylsarcosine; shaving method
WO2008037609A1 (en) * 2006-09-28 2008-04-03 Unilever Plc Mild foaming personal cleansing composition with high levels of hydrocarbon wax and oil emollients
FR2911269A1 (en) * 2007-01-17 2008-07-18 Oreal Soapless shaving foam composition for aerosol dispensers, contains aqueous phase, N-acyl-sarcosine, mineral or organic base, 14-18C linear saturated fatty acid, non-ionic surfactant and propellant
EP1946741A1 (en) * 2007-01-17 2008-07-23 L'Oréal Soap-free shaving foam based on n-acylsarcosinate and free linear saturated fatty acid; shaving method

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