Patent Publication Number: US-2006019844-A1

Title: Foaming cleansing composition

Description:
REFERENCE TO PRIOR APPLICATIONS  
      This application claims priority to French patent application 0451651 filed Jul. 26, 2004, incorporated herein by reference.  
     FIELD OF THE INVENTION  
      The invention relates to a composition comprising at least one carboxylic ionic surfactant and at least one amphoteric surfactant of the betaine type. The invention composition is preferably a foaming cleansing composition which can be rinsed off with water. The invention further relates to the various uses of the described composition, for example in the cosmetics and dermatological fields, in particular as a product for cleansing or removing makeup from the skin, scalp and/or the hair.  
      Additional advantages and other features of the present invention will be set forth in part in the description that follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from the practice of the present invention. The advantages of the present invention may be realized and obtained as particularly pointed out in the appended claims. As will be realized, the present invention is capable of other and different embodiments, and its several details are capable of modifications in various obvious respects, all without departing from the present invention. The description is to be regarded as illustrative in nature, and not as restrictive.  
     BACKGROUND OF THE INVENTION  
      Cleansing the skin is very important for caring for the face. It must be as efficient as possible since greasy residues, such as excess sebum, the remnants of cosmetic products used daily, and makeup products, in particular waterproof products, accumulate in the skin folds and can block the pores of the skin and result in the appearance of spots.  
      The use of foaming detergent aqueous gels for cleansing the skin is known. Their cleansing action is provided by the surfactants that they comprise, these surfactants suspending the greasy residues and the pigments of the makeup products. These gels are effective and pleasant to use because they give a good foam. When a foaming gel is used, the aim is to have a gel that gives good foam qualities, i.e. an abundant foam that forms readily and rapidly, has fine bubbles and exhibits good hold (does not run), and that is rapidly rinsed off without leaving any residual film. In addition, comfortable gels are increasingly being sought, i.e. gels that leave a comfortable feeling on the skin after use, and which therefore result neither in tightness nor in feelings of dryness of the skin.  
      Foaming products are generally judged to be aggressive and to cause drying out because of the considerable amount of foaming surfactants that they comprise. Some consumers prefer to use gentler products, such as milks, tonics or creams. However, these often leave a film on the skin, which suggests incomplete cleansing.  
      The most simple way to decrease the aggressiveness of foaming products is to decrease the amount of surfactants therein. However, this decrease generally leads to an impairment of foaming effectiveness, which makes the product less attractive.  
     SUMMARY OF THE INVENTION  
      There therefore remains a need for producing products which, while being as gentle as non-foaming products, namely creams or milks, have the cleansing properties of foaming products.  
      The present invention satisfies this need by providing products that are both foaming and gentle, that exhibit very good foam quality, and that provide a good cleansing feeling while at the same time having good tolerance.  
      The inventors have discovered, surprisingly, that a foaming gel having both good cosmetic properties (qualities of the foam and quality of the rinsing) and good properties of tolerance, are obtained by using a surfactant system comprising at least one alkyl glycol carboxylate and at least one alkylbetaine.  
      Admittedly, cleansing compositions containing an alkyl glycol carboxylate and an alkylamidopropylbetaine are known from document JP11269488. However, the combination described in that document does not make it possible to obtain good effectiveness, in particular when the amount of surfactant is decreased. As shown in the examples hereinafter, with the emulsifying system of the invention, good foaming effectiveness can be conserved even if half as much surfactant is used.  
      Thus, the composition according to the invention has the advantage of having good effectiveness even with small amounts of surfactants. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      One subject of the present patent application is composition comprising, in a physiologically acceptable aqueous medium, a surfactant system containing (1) one or more anionic surfactants chosen from alkyl glycol carboxylic acids and their salts, and (2) one or more alkylbetaines, the total amount of alkyl glycol carboxylic acids and their salts and of alkylbetaines representing at least 50% of the total weight of the surfactant system. This composition is preferably a cleansing composition, and is preferably suitable for topical application.  
      The term “topical application” is here intended to mean an external application to the keratin materials, namely in particular the skin, the scalp, the eyelashes, the eyebrows, the nails, the hair and/or the mucous membranes. Since the composition is intended for topical application, it comprises a physiologically acceptable medium. Moreover, the term “physiologically acceptable medium” is intended to mean a medium that is compatible with the skin, the lips, the scalp, the eyelashes, the eyes, the nails and/or the hair. The composition may in particular constitute a cosmetic or dermatological composition.  
      Moreover, the term “aqueous medium” is intended to mean a medium containing an amount of water of at least 35% by weight, preferably ranging from 35 to 98% by weight, and better still from 40 to 80% by weight, relative to the total weight of the composition. The aqueous medium of the foaming compositions of the invention can comprise, for example besides water, one or more solvents chosen from lower alcohols containing from 1 to 6 carbon atoms, such as ethanol; polyols such as glycerol, glycols such as butylene glycol, isoprene glycol, propylene glycol and polyethylene glycols such as PEG-8, sorbitol; sugars such as glucose, fructose, maltose, lactose or sucrose; and mixtures thereof. The amount of these solvents in the composition of the invention can range for example from 0.5 to 30% by weight, and preferably from 5 to 20% by weight, relative to the total weight of the composition.  
      The compositions of the invention are preferably foaming cleansing compositions that can be rinsed off, and that can be used in the skin, hair or mucous membrane cleansing field.  
      The composition preferably is in the form of a fluid or of a gel. The viscosity of the compositions according to the invention preferably ranges from 0.01 to 50 Pa.s, measured at 25° C. using the Rheomat RM180 from Rheometric Scientific at 200 rpm (revolutions per minute), 10 minutes after the rotation of the rotor has begun. The device is equipped with a different rotor according to the viscosities, for example with a rotor  2  for ranges of viscosities of less than 0.7 Pa.s, with a rotor  3  for ranges of viscosities of 0.2 to 4 Pa.s, and with a rotor  4  for viscosities of greater than 2 Pa.s.  
      The compositions of the invention have the advantage of being very stable and of not exhibiting any phase separation or phenomenon of recrystallization when stored at from 4° C. to 45° C.  
      The surfactant system in the composition according to the invention may be present in an amount (in terms of active material) ranging for example from 2 to 15% by weight, preferably from 3 to 13% by weight, relative to the total weight of the composition.  
      The weight ratio of the anionic surfactant of alkyl glycol carboxylic type to the alkylbetaine can range from 90/10 to 10/90, and preferably from 25/75 to 75/25.  
      Anionic Surfactant  
      The composition according to the invention comprises at least one anionic surfactant chosen from alkyl glycol carboxylic acids (or 2-(2-hydroxyalkyloxyacetic)acids) and their salts.  
      These surfactants can in particular have the formula (I) below: 
 
R 1 —CHOH—CH 2 —O—CH 2 —COO − X +   (I)
 
 in which R 1  denotes a linear or branched, saturated or unsaturated alkyl radical containing from 8 to 30 carbon atoms, and X denotes hydrogen or a mineral or organic cation such as those derived from an alkali metal (for example Na+, K+), NH 4 +, ammoniums derived from basic amino acids such as lysine, arginine, sarcosine, ornithine or citrulline, or else amino alcohols such as monoethanolamine, diethanolamine, triethanolamine, glucamine, N-methylglucamine or 3-amino-1,2-propanediol. 
 
      The 2-hydroxyalkyl carboxylic acids that are preferred according to the present invention are compounds of formula (I) in which R 1  denotes more particularly a linear or branched, saturated or unsaturated alkyl radical containing from 8 to 18 carbon atoms.  
      Among the surfactants of formula (I), mention may in particular be made of sodium lauryl glycol carboxylate, sold under the names Beaulight Shaa® or Beaulight LCA-25N® by the company Sanyo, or its corresponding acid form sold under the name Beaulight Shaa (Acid Form)® sold by the company Sanyo.  
      The amount (in terms of active material) of anionic surfactants of alkyl glycol carboxylic type can range for example from 0.2 to 13.5% by weight, preferably from 0.5 to 10% by weight and better still from 1 to 6% by weight, relative to the total weight of the final composition.  
      Amphoteric Surfactant  
      The composition according to the invention comprises at least one alkylbetaine that is an amphoteric surfactant.  
      Included among the alkylbetaines that are particularly useful are (C 10 -C 20 )alkylbetaines and their oxyethylenated derivatives, in particular those containing from 1 to 20 oxyethylenated groups. Preferred (C 10 -C 20 )alkylbetaines are compounds of formula (II):  
                 
 
 in which R denotes a linear or branched C 10 -C 20 , and preferably C 12 -C 18 , alkyl radical. 
 
      The oxyethylenated compounds of these alkylbetaines can comprise, for example, from 2 to 50 oxyethylenated groups, and preferably from 5 to 30 oxyethylenated groups.  
      Included among alkylbetaines that can be used in the composition of the invention, mention may in particular be made of cocoylbetaine such as that sold under the name Dehyton AB 30 by the company Cognis, laurylbetaine such as that sold under the name Genagen KB® by the company Clariant, oxyethylenated laurylbetaine (10 EO) such as that sold under the name Laurylether(10 EO)betaine® by the company Shin Nihon Rica, oxyethylenated stearylbetaine (10 EO) such as that sold under the name Stearylether(10 EO)betaine® by the company Shin Nihon Rica, and mixtures thereof.  
      The amount of alkylbetaines can range, for example, from 0.2 to 13.5% by weight (in terms of active material), preferably from 0.5 to 10% by weight, and better still from 1 to 6% by weight, relative to the total weight of the composition.  
      Additional Surfactants  
      The surfactant system can contain, besides the alkyl glycol carboxylic acids (or alkyl glycol carboxylates) and the alkylbetaines, one or more other additional surfactants. However, these other surfactants, if they are present, should be in an amount of less than 50% by weight relative to the total amount of surfactant system. These surfactants can be present, for example, in an amount ranging from at most 7.5% by weight, and preferably in an amount of less than or equal to 5% by weight, relative to the total weight of the composition.  
      These additional surfactants can be chosen from non-ionic surfactants, anionic surfactants other than the alkyl glycol carboxylates, and mixtures thereof.  
      Non-ionic Surfactants  
      As non-ionic surfactants,. use may, for example, be made of alkylpolyglucosides (APG), maltose esters, polyglycerolated fatty alcohols, glucamine derivatives such as 2-ethylhexyloxycarbonyl-N-methylglucamine, and mixtures thereof.  
      As alkylpolyglucosides, use is preferably made of those comprising an alkyl group containing from 6 to 30 carbon atoms, and preferably from 8 to 16 carbon atoms, and comprising a hydrophilic (glucoside) group preferably comprising 1.2 to 3 saccharide units. As alkylpolyglucosides, mention may, for example, be made of decylglucoside ((C 9 /C 11 )alkylpolyglucoside (1.4)), such as the product sold under the name Mydol 10® by the company Kao Chemicals, the product sold under the name Plantaren 2000 UP® by the company Cognis and the product sold under the name Oramix NS 10® by the company Seppic; caprylyl/capryl glucoside, such as the product sold under the name Oramix CG 110® by the company Seppic; laurylglucoside such as the products sold under the names Plantaren 1200 N® and Plantacare 1200® by the company Cognis; and cocoglucoside such as the product sold under the name Plantacare 818/UP® by the company Cognis.  
      The maltose derivatives are, for example, those described in document EP-A-566438, such as O-octanoyl-6′-D-maltose, or else O-dodecanoyl-6′-D-maltose described in document FR-2,739,556.  
      Among the polyglycerolated fatty alcohols, mention may be made of polyglycerolated dodecanediol (3.5 mol of glycerol), a product sold under the name Chimexane NF® by the company Chimex.  
      Anionic Surfactants:  
      As anionic surfactants, use may, for example, be made of carboxylates, alkyl sulphates, sulphonates, sulphosuccinates, alkyl sulphoacetates, phosphates, polypeptides, anionic derivatives of alkylpolyglucosides, and mixtures thereof.  
      As carboxylates, mention may be made of: 
          amido ether carboxylates (AECs), such as sodium lauryl amido ether carboxylate (3 EO), sold under the name Akypo Foam 30® by the company Kao Chemicals;     polyoxyethylenated carboxylic acid salts, such as oxyethylenated (6 EO) sodium lauryl ether carboxylate (C 12-14-16  65/25/10) sold under the name Akypo Soft 45 NV® by the company Kao Chemicals, polyoxyethylenated and carboxymethylated fatty acids of olive oil origin sold under the name Olivem 400® by the company Biologia E Tecnologia, oxyethylenated (6 EO) sodium tridecyl ether carboxylate sold under the name Nikkol ECTD-6NEX® by the company Nikkol;     alkali metal salts of N-acylamino acids;     sarcosinates, such as sodium lauroyl sarcosinate sold under the name Sarkosyl NL 97® by the company Ciba or sold under the name Oramix L 30® by the company Seppic, sodium myristoyl sarcosinate sold under the name Nikkol Sarcosinate MN® by the company Nikkol, sodium palmitoyl sarcosinate sold under the name Nikkol Sarcosinate PN® by the company Nikkol;     alaninates, such as sodium N-lauroyl-N-methyl amidopropionate sold under the name Sodium Nikkol Alaninate LN 30® by the company Nikkol, or sold under the name Alanone ALE® by the company Kawaken, N-lauroyl-N-methylalanine triethanolamine sold under the name Alanone ALTA® by the company Kawaken;     glutamates, such as triethanolamine monococoylglutamate sold under the name Acylglutamate CT-12® by the company Ajinomoto, triethanolamine lauroylglutamate sold under the name Acylglutamate LT-12® by the company Ajinomoto;     aspartates, such as the mixture of triethanolamine N-lauroylaspartate/triethanolamine N-myristoylaspartate sold under the name Asparack® by the company Mitsubishi;     glycinates, such as sodium N-cocoylglycinate sold under the names Amilite GCS-12® and Amilite GCK 12 by the company Ajinomoto;     citrates such as the citric monoester of oxyethylenated (9 mol) coco alcohols, sold under the name Witconol EC 1129 by the company Goldschmidt;     galacturonates such as sodium dodecyl d-galactoside uronate sold by the company Soliance;     fatty acid salts (soaps) having a C 6 -C 22  alkyl chain, neutralized with an organic or mineral base such as potassium hydroxide, sodium hydroxide, triethanolamine, N-methylglucamine, lysine or arginine.        

      As alkyl sulphates that may or may not be oxyethylenated, mention may, for example, be made of sodium lauryl ether sulphate (C 12 -C 14  70/30) (2.2 EO) sold under the name Sipon AOS 225® by the company Cognis, ammonium lauryl ether sulphate (C 12 -C 14  70/30) (3 EO) sold under the name Sipon LEA  370® by the company Cognis, ammonium (C   12 -C 14 )alkyl ether (9 EO) sulphate sold under the name Rhodapex AB/20® by the company Rhodia Chimie, the mixture of sodium lauryl- and oleyl-ether sulphate and magnesium lauryl- and oleyl-ether sulphate sold under the name Empicol BSD 52 by the company Albright &amp; Wilson.  
      As sulphonates, mention may be made, for example, of: 
          alpha olefin sulphonates such as sodium alpha olefin sulphonate (C 14-16 ) sold under the names Bio-Terge AS-40® and Bio-Terge AS-40 CG® by the company Stepan, or sold under the name Witconate AOS Protege®, Sulframine AOS PH 12® sold by the company Witco, the secondary sodium olefin sulphonate sold under the name Hostapur SAS 30® by the company Clariant;     isethionates such as sodium cocoyl isethionate sold under the name Jordapon CI P® by the company Jordan;     taurates such as the sodium salt of palm kernel oil methyltaurate sold under the name Hostapon CT Pate® by the company Clariant, sodium N-cocoyl-N-methyltaurate sold under the name Hostapon LT-SF® by the company Clariant or Nikkol CMT-30-T® by the company Nikkol, or sodium palmitoyl methyltaurate sold under the name Nikkol PMT® by the company Nikkol.        

      As sulphosuccinates, mention may, for example, be made of oxyethylenated (3 EO) lauryl (C 12 -C 14  70/30) alcohol monosulphosuccinate sold under the name Setacin 103 Special® by the company Zschimmer Schwarz, or sold under the name Rewopol SB-FA 30 K 4® by the company Witco, the disodium salt of a hemi-sulphosuccinate of C 12 -C 14  alcohols sold under the name Setacin F Special Paste® by the company Zschimmer Schwarz, oxyethylenated (2 EO) disodium oleamido sulphosuccinate sold under the name Standapol SH 135® by the company Cognis, oxyethylenated (5 EO) lauramide monosulphosuccinate sold under the name Lebon A-5000® by the company Sanyo.  
      As alkyl sulphoacetates, mention may, for example, be made of the mixture of sodium lauryl sulphoacetate and disodium lauryl ether sulphosuccinate sold under the name Stepan-Mild LSB by the company Stepan.  
      As phosphates, mention may, for example, be made of monoalkyl phosphates and dialkyl phosphates, such as lauryl monophosphate sold under the name MAP 20® by the company Kao Chemicals, the potassium salt of dodecyl phosphate, a mixture of mono- and diester (predominantly diester) sold under the name Crafol AP-31® by the company Cognis, or octyl phosphate, a monoester and diester mixture sold under the name Crafol AP-20® by the company Cognis, the mixture of ethoxylated (7 mol of EO) 2-butyloctyl phosphate monoester and diester sold under the name Isofol 12 7 EO-Phosphate Ester® by the company Condea.  
      As polypeptides, mention may, for example, be made of those obtained by condensation of a fatty chain with amino acids from wheat and from oats, such as the potassium salt of hydrolysed lauroyl wheat protein sold under the name Aminofoam W OR® by the company Croda, the hydrolysed cocoyl soya protein, triethanolamine salt, sold under the name May-Tein SY® by the company Maybrook, the sodium salt of lauroyl oat amino acids sold under the name Proteol Oat® by the company Seppic, the hydrolysate of collagen grafted onto coconut fatty acids sold under the name Geliderm 3000® by the company Deutsche Gelatine, the soybean proteins acylated with hydrogenated coconut acids, sold under the name Proteol VS 22® by the company Seppic.  
      As anionic derivatives of alkyl polyglucoside, mention may be made of citrates, tartrates, sulphosuccinates, carbonates and glycerol ethers, produced from alkylpolyglucosides, such as the sodium salt of cocoyl polyglucoside (1.4) tartaric ester, sold under the name Eucarol AGE-ET® by the company Cesalpinia, the disodium salt of cocoyl polyglucoside (1.4) sulphosuccinic ester, sold under the name Essai 512 MP® by the company Seppic, the sodium salt of cocoyl polyglucoside (1.4) (1.4) citric ester, sold under the name Eucarol AGE-EC® by the company Cesalpinia, and the sodium lauryl polyglucoside ether carboxylate sold under the name Plantapon LGC Sorb by the company Cognis.  
      Additives  
      The composition of the invention can contain any of the additives or active agents conventionally used in cleansing products. Mention may, for example, be made of preserving agents; sequestering agents (EDTA); antioxidants; fragrances; dyestuffs such as soluble dyes and pigments; pearlescent agents; mattifying, bleaching or exfoliating, mineral or organic fillers, providing viscosity; sunscreens; hydrophilic or lipophilic, cosmetic or dermatological active agents, such as water-soluble or liposoluble vitamins, antiseptics, antiseborrheic agents, antimicrobial agents such as benzoyl peroxide, salicylic acid, triclosan, azelaic acid or niacinamide (vitamin PP), and also optical brighteners; fatty substances incompatible with aqueous medium, such as oils or waxes; viscosity modifiers or thickeners, or other agents having the effect of improving the cosmetic properties of the hair or of the skin, such as anionic, non-ionic, cationic or amphoteric polymers. The amounts of these various adjuvants include those conventionally used in the field under consideration, and are, for example, from 0.01 to 20% of the total weight of the composition. These adjuvants and the concentrations thereof should be such that they do not modify the property desired for the composition of the invention.  
      The composition of the invention may in particular contain thickeners, the amount of which depends on the viscosity desired for the final composition. The thickeners can be present at concentrations preferably ranging from 0.05 to 10% by weight, and preferably ranging from 0.05 to 5% by weight, relative to the total weight of the composition.  
      The thickener can be chosen in particular from thickening polymers, particles, electrolytes (salts), fatty amides, and mixtures thereof.  
      The thickening polymers may be anionic, amphoteric, cationic or non-ionic, may or may not be crosslinked, may or may not be hydrophobic modified polymers, and may be natural or synthetic.  
      As thickening polymers, use may, for example, be made of polymers derived from carboxylic acid, from polyacrylamide and/or from 2-acrylamidomethylpropane-sulphonic acid. The derived carboxylic polymer(s) may be associative polymers (i.e. containing a hydrophobic group) or non-associative polymers, that are water-soluble or water-dispersible, and that may or may not swell in an alkaline medium. They may be in the form of powder, of latex, or of an emulsion, or may be dispersed in water. The polymers may be non-ionic, anionic, cationic, zwitterionic or amphoteric. The monomers present in the polymers are preferably chosen from styrene, butadiene, ethylene, acrylonitrile, chloroprene, vinylidene chloride, isoprene, isobutylene or vinyl chloride monomers, and esters of acrylic acid, methacrylic acid, vinylacetic acid, maleic acid, crotonic acid and itaconic acid. These monomers can be used alone or in combination or can be mixed with one or more ionic monomers, for instance acrylic or methacrylic acids in charged form.  
      The preferred anionic polymers contain a monomer derived from acrylic or methacrylic acid and are partially neutralized, for example the polymers sold under the names Carbopol 981 and Carbopol 1382 by the company Noveon, and the polymer sold under the name Acrysol 22 by the company Röhm &amp; Haas.  
      As non-ionic thickening polymers, use may be made of oxyalkylenated derivatives of fatty acid esters or of fatty alcohol ethers, or polysaccharides. As oxyalkylenated derivatives of fatty acid esters or of fatty alcohol ethers, mention may in particular be made of ethoxylated alkyl or acyl derivatives of polyols, which may in particular be oxyethylenated derivatives of C 6 -C 30  fatty acid esters or of C 6 -C 30  fatty alcohol ethers, and of polyols such as glycerol, sorbitol, glucose or pentaerythritol, these oxyethylenated derivatives generally containing from 50 to 500 oxyethylenated groups, and preferably from 100 to 300 oxyethylenated groups. As compounds of this type, mention may, for example, be made of oxyethylenated (200 EO) glyceryl stearate, such as the product sold under the name Simulsol 220 TM® by the company Seppic, oxyethylenated (150 EO) pentaerythrityl tetrastearate, such as the product sold under the name Crothix® by the company Croda, oxyethylenated (120 EO) methyl glucose dioleate, such as the product sold under the name Glucamate DOE-120 Vegetal® by the company Amerchol, oxyethylenated (160 EO) sorbitan triisostearate, such as the product sold under the name Rheodol TW IS399C by the company Kao Chemicals, and mixtures thereof. As polysaccharides, mention may be made of xanthan gum and similar gums, and cellulose derivatives such as cetyl hydroxyethylcellulose sold under the name Natrosol plus grade 330 CS by the company Hercules, and mixtures thereof.  
      As formulation-thickening particles, use may be made of clays, for instance hectorites such as the Bentone MA sold by the company Elementis Specialities.  
      As fatty amides, use may, for example, be made of cocamide MEA, cocamide MIPA, and mixtures thereof.  
      As electrolytes, use may, for example, be made of sodium chloride, potassium chloride, magnesium chloride, and analogous salts, and mixtures thereof.  
      The compositions according to the invention may have an appearance ranging from a fluid product to a gel. They are stable and have very good rinsability. They can constitute, for example, a product for cleansing and/or for removing makeup from the skin, the scalp and/or the hair, a scrubbing product and/or an exfoliant product for the skin. They may constitute more particularly a cleansing composition for the skin.  
      Another subject of the invention is the cosmetic use of the composition as defined above, as a product for cleansing and/or for removing makeup from the skin, the scalp and/or the hair, and/or as a scrubbing product and/or an exfoliant product for the skin.  
      The compositions according to the invention may be used in at least two ways: 
          one use involves spreading the gel between the hands, applying it to the face or the body and then working it in the presence of water to develop the foam directly on the face or the body,     another use of this type of product involves developing the foam in the palms of the hands before applying it to the face or body. 
 
 In both cases, the foam may then be rinsed off. 
       

      The compositions according to the invention can also constitute a composition for treating greasy skin, in particular when they contain a specific active agent for treating greasy skin, such as, for example, salicylic acid, azelaic acid, triclosan, piroctone olamine or niacinamide (vitamin PP).  
      Another subject of the invention is the use of the composition as defined above, for preparing a composition intended for treating greasy skin.  
      The examples that follow serve to illustrate the invention without, however, being limiting in nature. The amounts indicated are given as % by weight unless otherwise mentioned.  
      In the table of examples, all the percentages are expressed by weight of active material (AM).  
      The sensory performance levels of the examples and the foam qualities developed were evaluated according to the protocol described below:  
      Before any use of the product, the hands are washed with household soap and then suitably rinsed and dried. Next, the protocol followed is as follows:  
      1—wet the hands by passing them under running water, and shake them three times to drain them,  
      2—place 1 g of product in the palm of one of the hands,  
      3—work the product between the two palms for 10 seconds,  
      4—add 2 ml of water and work the product again for 10 seconds,  
      5—add 2 ml of water and work the product again for 10 seconds,  
      6—evaluate the quality of the foam according to the criteria defined below,  
      7—rinse the hands under water,  
      8—wipe them.  
      The criteria are evaluated at each step of the protocol followed, and they are graded on a scale of 0 to 10. 
          steps 4-5: evaluation of the foam quality (step 6)     the foam volume: the grade attributed is higher, the greater the volume.     the size of the bubbles making up the foam: the grade attributed is higher, the larger the bubbles.     the hold of the foam: the grade attributed is higher, the more elastic the foam and the less it runs.     step 7: evaluation during rinsing out rinsing out: the grade attributed is lower, the greater the presence of a slippery film that is difficult to remove, which means that the grade is higher, the more easy it is to rinse out the product without leaving any film.        

      The evaluation panel consists of 4 trained experts. The mean of the four grades makes it possible to compare the compositions according to each of the criteria.  
     EXAMPLES  
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                   
               
               
                   
                   
                   
                 Comparative 
                 Comparative 
                 Comparative 
                 Comparative 
               
               
                 Composition 
                 Example 1A 
                 Example 1B 
                 Example 2A 
                 Example 2B 
                 Example 3A 
                 Example 3B 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Sodium lauryl glycol carboxylate (1) 
                 7.8 
                 3.9 
                 7.8 
                 3.9 
                 7.8 
                 3.9 
               
               
                 Cocobetaine (2) 
                 6.5 
                 3.25 
                 — 
                 — 
                 — 
                 — 
               
               
                 Cocoglucoside (3) 
                 — 
                 — 
                 — 
                 — 
                 6.5 
                 3.25 
               
               
                 Cocamidopropylbetaine (4) 
                 — 
                 — 
                 6.5 
                 3.25 
                 — 
                 — 
               
               
                 PEG-150 pentaerythrityl tetrastearate 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
               
               
                 PEG-120 methylglucose dioleate 
                 0.5 
                 0.5 
                 0.5 
                 0.5 
                 0.5 
                 0.5 
               
               
                 Glycerol 
                 10 
                 10 
                 10 
                 10 
                 10 
                 10 
               
               
                 Citric acid 
                 0.19 
                 0.09 
                 0.12 
                 — 
                 0.12 
                 0.06 
               
               
                 DDM hydantoin 
                 0.2 
                 0.2 
                 0.2 
                 0.2 
                 0.2 
                 0.2 
               
               
                 Sodium methylparaben 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
               
               
                 Water 
                 qs 100% 
                 qs 100% 
                 qs 100% 
                 qs 100% 
                 qs 100% 
                 qs 100% 
               
               
                 Bubble size 
                 5.2 
                 4 
                 4.5 
                 4 
                 5 
                 4.2 
               
               
                 Foam volume 
                 10 
                 8.8 
                 9.7 
                 7.7 
                 7 
                 7 
               
               
                 Foam hold 
                 7.7 
                 7.5 
                 7.8 
                 6.7 
                 7.5 
                 5.8 
               
               
                 Rinsing out 
                 8.2 
                 7.8 
                 7.7 
                 7.7 
                 8.3 
                 8 
               
               
                   
               
               
                   (1) Beaulight Shaa (Sanyo) containing 30% of active material, introduced in an appropriate amount so as to have the % of active material indicated in the table.    
               
               
                   (2) Dehyton AB30 (Cognis) containing 30% of active material, introduced in an appropriate amount so as to have the % of active material indicated in the table.    
               
               
                   (3) Plantacare 818 UP (Cognis) containing 53% of active material, introduced in an appropriate amount so as to have the % of active material indicated in the table.    
               
               
                   (4) Tegobetain F50 (Goldschmidt) containing 38% of active material, introduced in an appropriate amount so as to have the % of active material indicated in the table.    
               
            
           
         
       
     
      The sensory tests carried out on the compositions according to the invention show that the foaming performance levels are virtually identical at 14.3% (Example 1A) and at 7.15% (Example 1B) by weight of surfactants (expressed as active material): medium bubble size, very good volume, good foam hold.  
      On the other hand, the tests of the comparative examples show a decrease in performance levels with the Beaulight/cocamidopropylbetaine (Comparative Examples 2A and 2B) and Beaulight/cocoglucoside (Comparative Examples 3A and 3B) combinations, using a reduced amount of surfactant (6.5% instead of 13%). In particular, the hold of foams obtained is not as good, and they become runny.  
      The examples realized below show the importance of at least 50% by weight of the combination of alkyl glycol carboxylic acid or acid salt and alkylbetaine, relative to the total weight of the surfactant system:  
                                                           Example 2   Example 3                   according   according           to the   to the   Comparative   Comparative           invention   invention   example 4   example 5                                                        Sodium Lauryl   4.33   2.6   1.76   0.85       Glycol       Carboxylate (1)       Cocobetaine (2)   2.17   1.3   0.84   0.45       Sodium Lauryl   —   2.6   3.9   5.2       ether sulphate       Water   qs 100   qs 100   qs 100   qs 100       Preserving agents   0.5   0.5   0.5   0.5       pH adjusted with   7.6   7.6   7.6   7.6       10% citric acid       relative %   100%    60%    40%    20%        (Lauryl glycol       carboxylate -       cocobetaine)/       total surfactant       Foam grades       Foam volume   10   8.1   7.2   7.5       Bubble size   4.5   4.8   5.2   5       Density   7.8   7.5   7   6.7                  
 
      The various foaming products were evaluated according to the sensory protocol described above. The foam grades show a considerable decrease in performance levels, in particular regarding the volume and density criteria, when the relative content of surfactants according to the invention (lauryl glycol carboxylate+alkylbetaine combination) is decreased.  
      At a relative content of surfactants according to the invention of less than 50%, the foams obtained are both softer and less voluminous. The above written description of the invention provides a manner and process of making and using it such that any person skilled in this art is enabled to make and use the same, this enablement being provided in particular for the subject matter of the appended claims, which make up a part of the original description and including a composition for topical application, comprising, in a physiologically. acceptable aqueous medium, a surfactant system containing (1) one or more anionic surfactants chosen from alkyl glycol carboxylic acids and their salts, and (2) one or more alkylbetaines, the total amount of alkyl glycol carboxylic acids and their salts and of alkylbetaines representing at least 50% of the total weight of the surfactant system.  
      As used above, the phrases “selected from the group consisting of,” “chosen from,” and the like include mixtures of the specified materials.  
      All references, patents, applications, tests, standards, documents, publications, brochures, texts, articles, etc. mentioned herein are incorporated herein by reference. Where a numerical limit or range is stated, the endpoints are included. Also, all values and subranges within a numerical limit or range are specifically included as if explicitly written out. Terms such as “contain(s),” “containing” and the like as used herein are open terms meaning ‘including at least’ unless otherwise specifically noted.  
      The above description is presented to enable a person skilled in the art to make and use the invention, and is provided in the context of a particular application and its requirements. Various modifications to the preferred embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. Thus, this invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.