EP1575406B1

EP1575406B1 - Customized personal cleansing system

Info

Publication number: EP1575406B1
Application number: EP03782280A
Authority: EP
Inventors: Sudhakar Unilever R & D Port Sunlight PUVVADA; T. N. Unilever Home & Personal Care USA MORIKIS
Original assignee: Unilever PLC; Unilever NV
Current assignee: Unilever NV
Priority date: 2002-12-26
Filing date: 2003-12-01
Publication date: 2008-11-19
Anticipated expiration: 2023-12-01
Also published as: EP1575406A1; US20040161290A1; WO2004058026A1; ZA200504462B; ATE414456T1; MXPA05006968A; AU2003289940B2; BR0316777A; AU2003289940A1; DE60324837D1

Abstract

A cleansing system is described that allows the user to select an assortment of one or more of skin cleansing, aesthetic, and skin moisturization and benefit bars for insertion within a porous pouch to produce a customized cleansing implement. A cleansing system kit is also described which includes at least one porous pouch and an assortment of skin cleansing, aesthetic, and skin benefit bars.

Description

The invention relates to a personal cleansing system and a personal cleansing kit, and more specifically wherein an assembly of one or more of skin cleansing, aesthetic, and skin moisturization and benefit bars are selected, and then combined in a customized manner.
Toilet bar skin cleaning properties are well known. An ideal bar composition not only cleans, but provides a large quantity of lather and leaves the skin feeling comfortable. Consumers also desire to obtain toilet bars with good hardness, low mush, and that contain appealing fragrances and one or more skin benefit agents and emollients for moisturizing and treating the skin according to individual preferences and needs.
To accomplish this, a wide variety of additives have been suggested for inclusion in toilet bars. Some additives enhance the physical properties of the bar such as lather volume, hardness and wear rate. Other additives effect the aesthetic and sensory properties of the bar. Still other additives enhance skin moisturization, residual antibacterial properties, and treat skin conditions such as acne, etc. Unfortunately not all potentially desirable additives may be compatible with each other. As a result, a single toilet bar product is not suitable or desirable for every consumer. At the same time, the bar manufacturer desires to reduce costs by minimizing the difference in toilet bar compositions it produces.
The use of a porous or netted bag or pouch to carry soap is known. The prior art includes US 1,682,119 where a bag is provided with soap in a flake or fragment form. Similarly US 2,607,940 discloses a mesh bag so that a soap can be easily inserted. Similar arrangements are taught in e.g. US Patent No. 3,167,805 , US Patent No. 4,190,550 , US Patent No. 4,228,834 , US Patent No. 4,480,939 , and US Patent No. 5,462,378 . US Patent No. 4,789,262 teaches a soap holding cleaning pad. US Patent No. 5,839,842 discloses a cleansing system with a toilet bar and a sponge in a porous pouch. US Patent No. 6,042,288 teaches the use of a synthetic detergent bar and a pouf for holding the bar. JP Patent No. 10137152 also teaches a solid soap in an expansible net. However, the problem with prior art toilet bar and pouch implements is the lack of a system and a kit to make available a product with a wide range of sensory properties in a convenient format but with excellent physical properties.
Surprisingly it has been found that when a single toilet bar is formulated with high levels of moisturizing and aesthetic fragrance ingredients, the properties of the bar such as lather, wear rate, etc. are substantially degraded compared to a system of individual toilet bar ingredients formulated separately where a cleansing bar, a moisturizing bar, and an aesthetic fragrance bar are separately produced. For the purposes of this invention, a "bar" is herein defined as an individual toilet bar or other geometrically or amorphous shaped body that may be selected from and combined with other toilet bars or bodies in a porous holder according to the invention. According to the present invention, these separate bars may be presented in a kit and combined in a porous pouch to bring together all the cleansing and skin treatment attributes desired by the consumer and at the same time form a useful cleansing implement with superior lathering properties compared to a single toilet bar formed with the same ingredients. Furthermore it has been found that production efficiency is enhanced by making the bars separately, since such bars if made by the melt cast process have a shorter solidification time. Moreover, the variability of solidification time in melt cast bars may be minimized by separate manufacturing of the bars. With respect to extrusion of such bars, the variability of processing parameters such as extrusion rate and stampability may also be minimized by separate manufacture of the bars.
In a first aspect of the invention, there is provided a personal cleansing kit according to claim 1.
As used herein, the aesthetic ingredient is defined as either fragrances, colorants, pigments, cosmetics (without benefit ingredients as hereafter defined), suspended bodies and blends thereof; and the benefit ingredient is defined as either emollients, skin active materials (as defined below) and blends thereof.
In another aspect of the invention is a method for providing a personal customized cleansing product to a user according to claim 4.
Preferred embodiments of the invention will now be described by way of example only with reference to the accompanying drawings wherein like figures represent like features, in which:

Fig. 1 is a perspective view of a preferred embodiment of the inventive cleansing kit.

The present invention consists of a kit comprising two or more solid/semi-solid bars that may be combined in a porous closable pouch by the user and the system for fabricating such a combination. The kit's parts, i.e. the cleansing, aesthetic and benefit bars and porous holder advantageously contained in an outer container may also be purchased separately by the consumer, who can use the inventive system to create a customized cleansing article by selecting two or more of the compositions and inserting them into the pouch prior to showering.
The bars may serve different functions such as cleansing, benefit delivery etc. They may also have different ingredients that combine together to provide a unique benefit or fragrance. The bars may also consist in whole or part of inert ingredients and provide e.g. a massage or exfoliation type action and the like.
Advantageously, the cleansing kit further includes a set of instructions relating to the use of the kit. Preferably the first and second compositions in the kit have a rigidity index greater than about 0.2 Mpa at 25°C.
With respect to the cleansing composition, it advantageously includes an amphoteric surfactant, and preferaly about 15 % to 80 % by wt. of a C8 to C24 acyl isethionate, or about 15 % to 80 % by wt. of a soap. With respect to an emollient, the benefit composition advantageously includes an emollient selected from silicone oils and gums, fats, triglyceride oils, waxes, hydrophobic plant extracts, fatty esters, hydrocarbons and blends thereof, as well as other useful emollients listed below. The benefit composition advantageously includes a component selected from vitamins, antimicrobial agents, acne medications, exfoliating agents, astringents, antioxidants, enzymes, sunscreens and ultraviolet radiation absorbing compositions and the like.
Advantageously, the closable receptacle and plurality of cosmetic compositions are contained in a container partitioned to separate the receptacle and the plurality of cosmetic compositions for ease in selection by the consumer. Preferably the closable receptacle is formed of a polymeric mesh material.
Preferred embodiments of the invention will now be described by way of example with reference to the accompanying drawing.
A preferred embodiment of the inventive cleansing kit 60 is depicted in Fig. 1. The customized cleansing implement may be supplied partially pre-assembled or preferably in components as illustrated in Fig. 1 to be assembled by the user according to instructions supplied with kit 60. In operation, the user will select and insert, as desired, one or more of a cleansing bar 24, a fragrance bar 26, a conditioning bar 28, and an active agent bar 30 into bag holder 40 all contained in container 64. When all of the bars desired for the implement have been inserted in the bag holder 40, pull ties 56 may be pulled so that together with cord locking device 58 will serve to keep the bars inside the bag holder 40 during use until the bars are either exhausted or until such time as the user desires to use a new selection of bars in the kit by either adding, removing or replacing any of the bars in any combination desired.
Surfactants are an essential ingredient of at least one of the toilet bars of the invention. They are compounds that have hydrophobic and hydrophilic portions that act to reduce the surface tension of the aqueous solutions they are dissolved in. Useful surfactants can include anionic, nonionic, amphoteric, and cationic surfactants, and blends thereof.
At least one of the toilet bars such as the cleansing bar, may contain an anionic surfactant which may preferably be a soap; preferably it contains at least 0.1 % by wt. of soap. The term "soap" is used herein in its popular sense, i.e., the alkali metal or alkanol ammonium salts of alkane- or alkene monocarboxylic acids. Sodium, potassium, mono-, di- and triethanol ammonium cations, or combinations thereof, are suitable for purposes of this invention. In general, sodium soaps are used in the compositions of this invention, but from about 1 % to about 25 % of the soap may be ammonium, potassium, magnesium, calcium or a mixture of these soaps. The soaps useful herein are the well known alkali metal salts of alkanoic or alkenoic acids having about 12 to 22 carbon atoms, preferably about 12 to about 18 carbon atoms. They may also be described as alkali metal carboxylates of alkyl or alkene hydrocarbons having about 12 to about 22 carbon atoms.
At least one of the toilet bars of the present invention may contain one or more non-soap anionic detergents. The anionic detergent active which may be used may be aliphatic sulfonates, such as a primary alkane (e.g., C₈-C₂₂) sulfonate, primary alkane (e.g., C₈-C₂₂) disulfonate, C₈-C₂₂ alkene sulfonate, C₈-C₂₂ hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate (AGS); or aromatic sulfonates such as alkyl benzene sulfonate.
The anionic may also be an alkyl sulfate (e.g., C₁₂-C₁₈ alkyl sulfate) or alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates are those having the formula:

RO(CH₂CH₂O)_nSO₃M

wherein R is an alkyl or alkenyl having 8 to 18 carbons, preferably 12 to 18 carbons, n has an average value of greater than 1.0, preferably greater than 3; and M is a solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. Ammonium and sodium lauryl ether sulfates are preferred.
The anionic may also be alkyl sulfosuccinates (including mono- and dialkyl, e.g., C₆-C₂₂ sulfosuccinates); alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C₈-C₂₂ alkyl phosphates and phosphates, alkyl phosphate esters and alkoxyl alkyl phosphate esters, acyl lactates, C₈-C₂₂ monoalkyl succinates and maleates, sulphoacetates, alkyl glucosides and acyl isethionates, and the like.
Sulfosuccinates may be monoalkyl sulfosuccinates having the formula:

R⁴O₂CCH₂CH(SO₃M)CO₂M;

and amide-MEA sulfosuccinates of the formula;

R⁴CONHCH₂CH₂O₂CCH₂CH(SO₃M)CO₂M

wherein R⁴ ranges from C₈-C₂₂ alkyl and M is a solubilizing cation.
Sarcosinates are generally indicated by the formula:

R¹CON(CH₃)CH₂CO₂M,

wherein R¹ ranges from C₈-C₂₀ alkyl and M is a solubilizing cation.
Taurates are generally identified by formula:

R²CONR³CH₂CH₂SO₃M

wherein R² ranges from C₈-C₂₀ alkyl, R³ ranges from C₁-C₄ alkyl and M is a solubilizing cation.
At least one of the toilet bars preferably contains non-soap anionic surfactants, preferably C₈-C₁₄ acyl isethionates. These esters are prepared by reaction between alkali metal isethionate with mixed aliphatic fatty acids having from 6 to 12 carbon atoms and an iodine value of less than 20.
The acyl isethionate may be an alkoxylated isethionate such as is described in Ilardi et al., U.S. Patent No. 5,393,466 , titled "Fatty Acid Esters of Polyalkoxylated isethonic acid; issued February 28, 1995; hereby incorporated by reference. This compound has the general formula:
wherein R is an alkyl group having 8 to 18 carbons, m is an integer from 1 to 4, X and Y are hydrogen or an alkyl group having 1 to 4 carbons and M⁺ is a monovalent cation such as, for example, sodium, potassium or ammonium.
In another embodiment of at least one of the toilet bars in the inventive cleansing article, e.g. the fragrance bar, conditioning bar or active agent bar, there is less than 25 % by wt. of anionic surfactants; preferably there is less than 20 %, and more preferably less than 15, 10, 7, 5, 3 or 1 % by wt. of these surfactants.
Anionic surfactants may be usefully employed in the cleansing bar of the present invention in the concentration range of about 5 % to 90 % by wt., preferably in the concentration range of about 20 % to 60 % by wt.
One or more amphoteric surfactants may be used in at least one bar of this invention. Such surfactants include at least one acid group. This may be a carboxylic or a sulphonic acid group. They include quaternary nitrogen, and therefore are quaternary amido acids. They should generally include an alkyl or alkenyl group of 7 to 18 carbon atoms. They will usually comply with an overall structural formula:

where R¹ is alkyl or alkenyl of 7 to 18 carbon atoms;
R² and R³ are each independently alkyl, hydroxyalkyl or carboxyalkyl of 1 to 3 carbon atoms;
n is 2 to 4;
m is 0 to 1;
X is alkylene of 1 to 3 carbon atoms optionally substituted with hydroxyl; and
Y is -CO₂- or -SO₃-

Suitable amphoteric surfactants within the above general formula include simple betaines of formula:
and amido betaines of formula:
where n is 2 or 3.
In both formulae, R¹, R² and R³ are as defined previously. R¹ may in particular be a mixture of C₁₂ and C₁₄ alkyl groups derived from coconut oil so that at least half, preferably at least three quarters of the groups R¹ have 10 to 14 carbon atoms. R² and R³ are preferably methyl.
A further possibility is that the amphoteric detergent is a sulphobetaine of formula:
or
where m is 2 or 3, or variants of these in which -(CH₂)₃SO₃ ^- is replaced by
In these formulae R¹, R² and R³ are as discussed previously.
Amphoacetates and diamphoacetates are also intended to be covered in possible zwitterionic and/or amphoteric compounds which may be used such as e.g., sodium lauroamphoacetate, sodium cocoamphoacetate, and blends thereof, and the like.
Zwitterionic and/or amphoteric surfactants may be usefully employed in the cleansing bar of the present invention in the concentration range of about 0 to 30 % by wt., preferably in the concentration range of about 1 % to 20 % by wt.
One or more nonionic surfactants may also be used in at least one of the cleansing bars of the present invention.
The nonionics which may be used include in particular the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example aliphatic alcohols, acids, amides or alkylphenols with alkylene oxides, especially ethylene oxide either alone or with propylene oxide. Specific nonionic detergent compounds are alkyl (C₆-C₂₂) phenols ethylene oxide condensates, the condensation products of aliphatic (C₈-C₁₈) primary or secondary linear or branched alcohols with ethylene oxide, and products made by condensation of ethylene oxide with the reaction products of propylene oxide and ethylenediamine. Other so-called nonionic detergent compounds include long chain tertiary amine oxides, long chain tertiary phosphine oxides and dialkyl sulphoxide, and the like.
The nonionic may also be a sugar amide, such as a polysaccharide amide. Specifically, the surfactant may be one of the lactobionamides described in U.S. Patent No. 5,389,279 to Au et al . titled "Compositions Comprising Nonionic Glycolipid Surfactants issued February 14, 1995; which is hereby incorporated by reference or it may be one of the sugar amides described in US Patent No. 5,009,814 to Kelkenberg , titled "Use of N-Poly Hydroxyalkyl Fatty Acid Amides as Thickening Agents for Liquid Aqueous Surfactant Systems" issued April 23, 1991; hereby incorporated into the subject application by reference.
Nonionic surfactants may be usefully employed in the cleansing bar of the present invention in the concentration range of about 0 to 30 % by wt., preferably in the concentration range of about 1 % to 20 % by wt.
One or more cationic surfactants may also be used in the inventive toilet bar composition.
Examples of cationic detergents are the quaternary ammonium compounds such as alkyldimethylammonium halogenides.
Cationic surfactants may be usefully employed in the cleansing bar of the present invention in the concentration range of about 0 to 30 % by wt., preferably in the concentration range of about 1 % to 20 % by wt.
Other suitable surfactants which may be used are described in U.S. Patent No. 3,723,325 to Parran Jr. titled "Detergent Compositions Containing Particle Deposition Enhancing Agents" issued March, 27, 1973; and "Surface Active Agents and Detergents" (Vol. I & II) by Schwartz, Perry & Berch, both of which are also incorporated into the subject application by reference.
In addition, at least one of the bar compositions may be an aesthetic agent bar and may include fragrances, colorants, pigments, particles, suspended materials, blends thereof, and the like. When they are employed, fragrances are advantageously used in the range of about 0.1 % to 10 % by wt., colorants in the range of about 0.000001 % to 1 % by wt., and particles/suspended materials in the range of about 0.01 % to 10 % by wt.
Preferably the bars employed in the inventive article may be differentiated from each other by different colorants, where the color signifies a specific attribute to be conferred by the bar or where color is used as a descriptor of the bar.
The personal cleansing article of the present invention may contain toilet bar compositions that contain a safe and effective amount of a benefit agent. This benefit agent may be selected from water-soluble active agents, oil soluble active agents, pharmaceutically acceptable salts and mixtures thereof. The term "benefit agent" as used herein means personal care actives that can be used to deliver a benefit to the skin and/or hair. The term "safe and effective amount" as used herein, means an amount of benefit agent high enough to modify the condition to be treated or to deliver the desired skin care benefit, but low enough to avoid serious side effects.
The term "benefit," as used herein, means the therapeutic, prophylactic, and/or chronic benefits associated with treating a particular condition with one or more of the benefit agents described herein. What is a safe and effective amount of the active agent ingredient will vary with the specific active agent, the ability of the active to penetrate through the skin, the age, health condition, and skin condition of the user, and other like factors. Preferably the benefit agent containing toilet bars of the present invention comprise from about 0.01 % to about 50 %, more preferably from about 0.05 % to about 25 %, even more preferably 0.1 % to about 10 %, and most preferably 0.1 % to about 5 % by weight of the benefit agent component.
A wide variety of benefit agent ingredients are useful herein and include those selected from emollients, anti-acne actives, anti-wrinkle and anti-skin atrophy actives, skin barrier repair aids, cosmetic soothing aids, topical anesthetics, artificial tanning agents and accelerators, skin lightening actives, antimicrobial and antifungal actives, sunscreen actives, sebum stimulators, sebum inhibitors, anti-glycation actives and mixtures thereof and the like.
Anti-acne actives can be effective in treating acne vulgaris, a chronic disorder of the pilosebaceous follicles. Non-limiting examples of useful anti-acne actives include the keratolytics such as salicylic acid (o-hydroxybenzoic acid), derivatives thereof, and the like. Antimicrobial and antifungal actives can be effective to prevent the proliferation and growth of bacteria and fungi. Non-limiting examples of antimicrobial and antifungal actives include antibiotic drugs, quaternary ammonium compounds such as benzalkonium chloride; benzethonium chloride; triclosan; triclocarban; and mixtures thereof and the like.
Anti-wrinkle, anti-skin atrophy and skin repair actives can be effective in replenishing or rejuvenating the epidermal layer. These actives generally provide these desirable skin care benefits by promoting or maintaining the natural process of desquamation. Non-limiting examples of anti-wrinkle and anti-skin atrophy actives include retinoic acid and its derivatives, and the like. Skin barrier repair actives are those skin care actives which can help repair and replenish the natural moisture barrier function of the epidermis. Non-limiting examples of skin barrier repair actives include ceramide derivatives, mixtures thereof, and the like.
Non-steroidal cosmetic soothing actives can be effective in preventing or treating inflammation of the skin. The soothing active enhances the skin appearance benefits of the present invention, e.g., such agents contribute to a more uniform and acceptable skin tone or color. Non-limiting examples of cosmetic soothing agents include diphenhydramine and the like. Artificial tanning actives can help in simulating a natural suntan by increasing melanin in the skin or by producing the appearance of increased melanin in the skin. Non-limiting examples of artificial tanning agents and accelerators include dihydroxyacetone and the like.
Skin lightening actives can actually decrease the amount of melanin in the skin or provide an effect by other mechanisms. Non-limiting examples of skin lightening actives useful herein include phenolic and resourcinol derivatives, hydroquinone, and the like. Also useful herein are sunscreen actives. Non-limiting examples of sunscreens which are useful in the compositions of the present invention are those selected from the group consisting of 2-ethylhexyl p- methoxycinnamate, 2-ethylhexyl N,N-dimethyl-p-aminobenzoate, p- aminobenzoic acid, oxybenzone, and the like.
Sebum stimulators can increase the production of sebum by the sebaceous glands. Non-limiting examples of sebum stimulating actives include dehydroetiandrosterone (DHEA) and the like. Sebum inhibitors can decrease the production of sebum by the sebaceous glands. Non-limiting examples of useful sebum inhibiting actives include aluminium hydroxy chloride salts and the like. Also useful as actives in the present invention are protease inhibitors. The protease inhibitors suitable for use in the present invention include, but are not limited to, proteinases such as serine proteases and peptidases, such as carboxypepidases, and the like.
Other useful benefit ingredients in the present invention are skin tightening agents. Non-limiting examples of skin tightening agents which are useful in the compositions of the present invention include monomers which can bind a polymer to the skin such as terpolymers of vinylpyrrolidone, (meth)acrylic acid, and the like. Benefit agents in the present invention may also include anti-itch ingredients. Suitable examples of anti-itch ingredients which are useful in the compositions of the present invention include hydrocortisone, and the like. Suitable benefit agents may also include hair growth inhibitors, desquamating enzyme enhancers, and the like.
In addition, the inventive cleansing article includes toilet bar compositions that may include 0 to 15% by wt. optional ingredients which may be as follows:

sequestering agents, such as tetrasodium ethylenediaminetetraacetate (EDTA), EHDP or mixtures in an amount of 0.01 % to 1 %, preferably 0.01 % to 0.05 %; opacifiers and pearlizers such as zinc stearate, magnesium stearate, TiO₂, EGMS (ethylene glycol monostearate) or Lytron 621 (Styrene/Acrylate copolymer) and the like; all of which are useful in enhancing the appearance or cosmetic properties of the product.

The compositions may further comprise preservatives such as dimethyloldimethylhydantoin (Glydant XL1000), parabens, sorbic acid etc., and the like.
The compositions may also comprise coconut acyl mono- or diethanol amides as suds boosters, and strongly ionizing salts such as sodium chloride and sodium sulfate may also be used to advantage.
Antioxidants such as, for example, butylated hydroxytoluene (BHT) and the like may be used advantageously in amounts of about 0.01 % or higher if appropriate.
As discussed above emollients may be advantageously used in the present invention as benefit agents. The emollient "composition" may be a single benefit agent compound, or it may be a mixture of two or more compounds one or all of which may have a beneficial aspect. In addition, the benefit agent itself may act as a carrier for other compounds one may wish to add to one or more of the inventive toilet bars.
Humectants such as polyhydric alcohols, e.g. glycerine and propylene glycol, and the like, and polyols such as the polyethylene glycols listed below, and the like may be used as emollients or moisturizers.

Polyox WSR-205 PEG 14M,

Polyox WSR-N-60K PEG 45M, or

Polyox WSR-N-750 PEG 7M.
Humectants may be usefully employed in at least one bar of the present invention in the concentration range of about 1 % to 40 % by wt., preferably in the concentration range of about 5 % to 30 % by wt.
Hydrophobic emollients, hydrophilic emollients, or a blend thereof may be used. Preferably, hydrophobic emollients are used in excess of hydrophilic emollients in at least one of the toilet bars. Most preferably one or more hydrophobic emollients are used alone. Hydrophobic emollients are preferably present in a concentration greater than about 0.5 % by weight, more preferably about 4 % by weight in at least one of the bars. The term "emollient" is defined as a substance which softens or improves the elasticity, appearance, and youthfulness of the skin (stratum corneum) by either increasing its water content, adding, or replacing lipids and other skin nutrients; or both, and keeps it soft by retarding the decrease of its water content.
Useful emollients include the following:

(a) silicone oils and modifications thereof such as linear and cyclic polydimethylsiloxanes; amino, alkyl, alkylaryl, and aryl silicone oils;
(b) fats and oils including natural fats and oils such as jojoba, soybean, sunflower, rice bran, avocado, almond, olive, sesame, persic, castor, coconut, mink oils; cacao fat; beef tallow, lard; hardened oils obtained by hydrogenating the aforementioned oils; and synthetic mono, di and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride;
(c) waxes such as carnuba, spermaceti, beeswax, lanolin, and derivatives thereof;
(d) hydrophobic and hydrophillic plant extracts;
(e) hydrocarbons such as liquid paraffins, Vaseline®, microcrystalline wax, ceresin, squalene, pristan and mineral oil;
(f) higher fatty acids such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic, linolenic, lanolic, isostearic, arachidonic and poly unsaturated fatty acids (PUFA);
(g) higher alcohols such as lauryl, cetyl, stearyl, oleyl, behenyl, cholesterol and 2-hexydecanol alcohol;
(h) esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol distearate, glycerol tristearate, alkyl lactate, alkyl citrate and alkyl tartrate;
(i) essential oils and extracts thereof such as mentha, jasmine, camphor, white cedar, bitter orange peel, ryu, turpentine, cinnamon, bergamot, citrus unshiu, calamus, pine, lavender, bay, clove, hiba, eucalyptus, lemon, starflower, thyme, peppermint, rose, sage, sesame, ginger, basil, juniper, lemon grass, rosemary, rosewood, avocado, grape, grapeseed, myrrh, cucumber, watercress, calendula, elder flower, geranium, linden blossom, amaranth, seaweed, ginko, ginseng, carrot, guarana, tea tree, jojoba, comfrey, oatmeal; cocoa, neroli, vanilla, green tea, penny royal, aloe vera, menthol, cineole, eugenol, citral, citronelle, borneol, linalool, geraniol, evening primrose, camphor, thymol, spirantol, penene, limonene and terpenoid oils;
(j) lipids such as cholesterol, ceramides, sucrose esters and pseudo-ceramides as described in European Patent Specification No. 556,957 ;
(k) vitamins, minerals, and skin nutrients such as milk, vitamins A, E, and K; vitamin alkyl esters, including vitamin C alkyl esters; magnesium, calcium, copper, zinc and other metallic components;
(l) phospholipids;
(m) antiaging compounds such as alpha hydroxy acids, beta hydroxy acids; and
(o) mixtures of any of the foregoing components, and the like.

Preferred emollient benefit agents are selected from C12 to C18 fatty acids, triglyceride oils, mineral oils, petrolatum, and mixtures thereof.
Emollients may be usefully employed in at least one bar of the present invention in the concentration range of about 1 % to 90 % by wt., preferably in the concentration range of about 10 % to 60 % by wt.
Struturants such as solid structuring aids and fillers are advantageously used to maintain bar structural integrity. Examples of structuring aids include, but are not limited to polyalkylene glycols having MW of 2,500 to 10,000 and a melting point of about 40°C to 65°C; C8 to C20 alkanols, preferably straight chain, and saturated C14 to C18 alkanols; C8 to C25 fatty acids; preferably straight chain, and saturated C14 to C22 fatty acids; and water soluble starches, such as maltodextrin and the like. The structuring aids and fillers generally comprise about 0 to 35 % by weight of the bar composition, preferably about 10 % to 25 % by weight.
The pouch may be formed of any porous or water permeable material sufficiently permeable to let water pass through the pouch and transfer the contents of the toilet bars that are either dissolved, dispersed, or suspended in the water to the user. Preferably the pouch material is sufficiently water insoluble so that maintains its integrity until the toilet bars are substantially used up. Useful materials include polymeric mesh, woven or nonwoven fabric, paper, tissue, sponge or laminate of foam and fabric.
Advantageously, a light-weight polymeric meshed substrate may be used. A useful material is an extruded tubular netting mesh, particularly prepared from polyolefins such as polyethylene and the like, and other materials such as polyamides or polyesters and the like. They may be single or multiple ply netting such as in a pouf. The mesh structure may be polygonal, such as diamond shaped, or the like. Also suitable are irregular shapes. Advantageously the pouch cells are open and that preferably the contents within the pouch are observable from the exterior.
Optionally sponge like materials may also be included in the pouch. Useful sponge materials are closed cell materials either of synthetic or natural origin. Synthetic sponges are advantageously formed of foamed polyurethane and the like. Optionally the sponge material may be shaped to resemble an aesthetic form or be adapted to hold one or more of the toilet bars.
Examples of suitable non-woven substrates useful as pouch materials would be wet-laid, dry-laid, spun bonded, hydroentangled, air-laid, and the like comprising either singly or in admixture fibers such as cellulose, rayon, polyester, polypropylene, polyethylene, polyamide, and the like. The term substrate also includes naturally occurring materials such as animal skin e.g. chamois leathers and the like. Preferred embodiments employ non-woven substrates since they are economical and readily available in a variety of materials. By non-woven is meant that the layer is comprised of fibers which are not woven into a fabric but rather are formed into a sheet, particularly a tissue. The fibers can either be random (i.e., randomly aligned) or they can be carded (i.e. combed to be oriented in primarily one direction). Furthermore, the non-woven substrate can be composed of a combination of layers of random and carded fibers.
Non-woven substrates may be comprised of a variety of materials both natural and synthetic. By "natural" is meant that the materials are derived from plants, animals, insects or byproducts. By "synthetic" is meant that the materials are obtained primarily from various man-made materials or from material that is usually a fibrous web comprising any of the common synthetic or natural textile-length fibers, or mixtures thereof.
Non-limiting examples of natural materials useful as a pouch material in the present invention are silk fibers, keratin fibers and cellulosic fibers. Non-limiting examples of keratin fibers include those selected from wool fibers, camel hair fibers, and the like. Non-limiting examples of cellulosic fibers include those selected from wood pulp fibers, cotton fibers, hemp fibers, jute fibers, flax fibers, and mixtures thereof.
Non-limiting examples of synthetic materials useful as components in the present invention include those selected from acetate fibers, acrylic fibers, cellulose ester fibers, modacrylic fibers, polyamide fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, rayon fibers and mixtures thereof. Examples of some of these synthetic materials include acrylics such as Acrilan®, Creslan®, and the acrylonitrile-based fiber, Orlon®; cellulose ester fibers such as cellulose acetate, Arnel®, and Acele®; polyamides such as Nylons (e.g., Nylon 6, Nylon 66, Nylon 610 and the like; polyesters such as Fortrel®, Kodel®, and the polyethylene terephthalate fibers, Dacron®; polyolefins such as polypropylene, polyethylene; polyvinyl acetate fibers and mixtures thereof.
Non-woven substrates made from natural materials consist of webs or sheets most commonly formed on a fine wire screen from a liquid suspension of the fibers. Substrates made from natural materials useful in the present invention can be obtained from a wide variety of commercial sources.
Suitable pouch materials may include at least one apertured fabric, where a pattern is created by a network of bundled fiber segments surrounding apertures or holes; or in a contiguous nonwoven web which has been apertured or provided with slits or other openings. In one preferred embodiment, the water insoluble matterial is a substantially contiguous network of water insoluble fibers having a plurality of macroscopic openings. A macroscopic opening is defined as an opening that is large relative to the intrinsic pore size of the water insoluble material.
In a typical spunbond or bonded carded web, for example, a macroscopic opening would appear to the eye to be a deliberately introduced hole or void in the web, rather than a characteristic pore between adjacent fibers, and specifically could have a characteristic width or major axis diameter of about 0.1 mm to about 10 mm, or larger; preferably about 1 mm to about 5 mm. A useful characteristic width may be defined as 4 times the area of the aperture divided by the perimeter. Useful fabric aperture densities are about 10 to 700 per square inch, preferably about 20 to 500 per square inch.
As discussed above, the nonwoven web may be made from synthetic fibers, as is known in the art, and may be a spunbond web, a meltblown web, a bonded carded web, or other fibrous nonwoven structures known in the art.
For example, a polyester nonwoven web such as a low basis weight spunbond material could be provided with apertures through pin aperturing; perf embossing and mechanical stretching of the web; die punching or stamping to provide apertures or holes in the web; hydroentangling to impart apertures by rearrangement of the fibers due to the interaction of water jets with the fibrous web as it resides on a patterned, textured or three-dimensional substrate that imparts a pattern to the web; water knives that cut out desired apertures or holes in the web; laser cutters that cut out portions of the web; patterned forming techniques, such as air laying of synthetic fibers on a patterned substrate to impart macroscopic openings; needle punching with sets of barbed needles to engage and displace fibers; and other methods known in the art. Preferably, the openings are provided in a regular pattern over at least a portion of the pouch.
The pouch of the present invention can comprise two or more portions, each having a different texture and abrasiveness. The differing textures can result from the use of different combinations of materials or from the use of a substrate having a more abrasive side for exfoliation and a softer, absorbent side for gentle cleansing. In addition, separate portions of the pouch can be manufactured to have different permanent colors thereby helping the user to further distinguish the surfaces.

Examples

Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material ought to be understood as modified by the word "about".
The following examples will more fully illustrate the embodiments of this invention. All parts, percentages and proportions referred to herein and in the appended claims are by weight unless otherwise illustrated.
The example illustrated in table 1 represents an inventive three part kit divided into cleansing, benefits, and fragrances type bars as major categories, and a closable porous pouch to contain a user selection of the bars. Each major bar category in Table 1 is further divided into subcategories representing different specific functions, benefits, or aesthetic attributes. Examples of specific ingredients present in the subcategory compositions are also illustrated, e.g. where the Benefits bar includes separate subcategories identified as Nourishing, Anti-aging, Moisturizing, Smoothing, Silkening, and Hydrating; and wherein e.g. the Nourishing Benefits bar contains vitamins E, A, C and Jojoba and Macademia Nut oil as their specific benefit ingredients.

The kit could contain bars from one or more of the categories. A set of instructions is also preferably provided with the kit instructing the user of the kit in how to assemble the cleansing article that meets the users ) needs.

Table 1. Three part kit.

*Cleansing*	*Benefits*	*Fragrances*
Natural	Nourishing	Rejuvenating
Gentle	Vitamin E,A,C	Cucumber Essence
	Jojoba Oil	Berry Blossom
	Macadamia Nut Oil	Ginger
Sensitive

	Anti-aging	Calming
Purifying	AHA's	Lavender
	Retinal	Vanilla
		Aloe

	Moisturizing	Romantic
	Shea Butter	Champagne
	Cocoa Butter	Plumeria
	Sunflower Seed Oil	Pomegranate
	Smoothing	Cooling
	Safflower Oil	Citrus
		Melon

	Silkening	Sensual Fruits
	Honey Silk Protein	Strawberry Raspberry
	Milk	Apricot

	Hydrating	Floral
	Chamomile	Roses
	Glycerin	Jasmin
		Lilac

Examples of Use:

1. One bar from each category.
2. Combine bars with various fragrances to make your own custom fragrance.
1. a. Blend Cucumber & Melon Bars to obtain a Cucumber-Melon fragrance
2. b. Combine Strawberry & Champagne Bars to obtain a Strawberry-Champagne fragrance
3. c. Combine Vanilla & Rose Bars to obtain a Vanilla-Rose fragrance
3. The bars can also be sold separately, to complete or replenish a Kit.

Rigidity Index

Equipment used: Instron

Basic Method:

1. Load Cell with the solid/semi-solid bar that is equilibrated and maintained at a constant temperature of 25°C using a water bath.
2. Apply force from the top so that the solid/semi-solid bar is displaced at a rate of 10 mm/min through an orifice at the bottom of cell and measure the force applied in kN. The orifice has a diameter of .2 mm and a length of 60 mm.

The Pressure drop across the capillary length defines how rigid the material is. This rigidity index is defined as: $Rigidity Index = Pressure drop (kPA) = Force (kN) / Area (m^{\land} 2)$
Where the $Area = PI * {Diam}^{\land} 2 / 4$
Diam= diameter of the rod applying the force, in this case 31.4 mm.

Claims

A personal cleansing kit (60), comprising:
a. a container (64);

b. a closable receptacle (40) which may be opened and closed formed of a porous material;

c. a plurality of solid or semi-solid bars (24,26,28,30) held outside the receptacle (40) in the container (64) including a first bar having a cleansing composition and a second bar having second composition selected from an aesthetic composition, a skin benefit composition or a combined aesthetic benefit composition; wherein the cleansing and second compositions differ from each other;
wherein the cleansing composition contains a surfactant selected from a synthetic anionic surfactant, a soap, and a blend thereof in a concentration greater than about 5 % by wt. and the second composition contains an aesthetic ingredient, a skin benefit ingredient or a blend thereof; the aesthetic or benefit ingredient being present in a concentration that is greater than the concentration of the same ingredient in the cleansing composition; and
wherein the closable receptacle (40) and said plurality of solid or semi-solid bars (24,26,28,30) are contained in said container (64) partitioned to separate the receptacle (40) and said plurality of solid or semi-solid bars (24,26,28,30) for ease in selection by the consumer, allowing the user to select and insert the first and second bars (24,26,28,30) inside the closable receptacle (40) to form a personal customized cleansing product; and

d. optionally, a set of instructions relating to the use of the kit.
The cleansing kit of claim 1 wherein said first and second compositions have a rigidity index greater than 0.2 Mpa at 25°C.
The cleansing kit of any preceding claim wherein the aesthetic ingredient is selected from fragrances, colorants, pigments, cosmetics, suspended bodies and blends thereof; and the benefit ingredient is selected from emollients, skin active materials and blends thereof;
the cleansing composition comprises 15 to 80 % by wt. of a C8 to C24 acyl isethionate, or 15 to 80 % by wt. of a soap;
the benefit composition includes an emollient selected from silicone oils and gums; fats; triglyceride oils; waxes; hydrophobic plant extracts; fatty esters, hydrocarbons or a component selected from vitamins, antimicrobial agents, acne medications, exfoliating agents, astringents, antioxidants, enzymes, sunscreens and ultraviolet radiation absorbing compositions, and blends thereof.
A method for providing a personal customized cleansing product to a user, comprising the steps of:
a. providing a selection of a plurality solid or semi-solid of bars (24,26,28,30) including a first bar having a cleansing composition and a second bar having second composition selected from an aesthetic composition, a skin benefit composition or a combined aesthetic and benefit composition; wherein the cleansing and second compositions differ from each other;

b. wherein the cleansing composition contains a surfactant selected from a synthetic anionic surfactant, a soap, and a blend thereof in a combined concentration greater than about 5 % by wt. and the second composition contains an aesthetic ingredient, a skin benefit ingredient and a blend thereof; the aesthetic or benefit ingredient being present in a concentration that is greater than the concentration of the same ingredient in the cleansing composition;

c. providing a closable receptacle (40) formed of a porous material to contain the plurality of solid or semi-solid cosmetic bars wherein said closable receptacle (40) and plurality of solid or semi-solid bars (24,26,28,30) are contained in a container (64) partitioned to separate the receptacle (40) and the plurality of solid or semi-solid bars (24,26,28,30) for ease in selection by the consumer; and

d. allowing the user to select and insert the first and second bars (24,26,28,30) inside the closable receptacle (40) to form a personal customized cleansing product; and

e. allowing the user to add, remove or replace the first and second bars in any combination desired.
The method of claim 4 wherein the aesthetic ingredient is selected from fragrances, colorants, pigments, cosmetics, suspended bodies and blends thereof; and the benefit ingredient is selected from emollients, skin active materials and blends thereof;
the cleansing composition comprises about 15 % to 80 % by wt. of a C8 to C24 acyl isethionate, or about 15 % to 80 % by wt. of a soap;
the benefit composition includes an emollient selected from silicone oils and gums, fats, triglyceride oils, waxes, hydrophobic plant extracts, fatty esters, hydrocarbons or a component selected from vitamins, antimicrobial agents, acne medications, exfoliating agents, astringents, antioxidants, enzymes, sunscreens and ultraviolet radiation absorbing compositions, and blends thereof.
The method of claims 4 or 5 wherein the closable receptacle (40) is formed of a polymeric mesh material.