MXPA98010874A - Additive composition to supply a beneficial agent and cleaning bars containing such aditi - Google Patents

Abstract

The present invention relates to novel wafer compositions comprising alkylene glycol, beneficial agent and fumed silica. The use of wafers comprising an excess of alkylene glycol on the beneficial agent and fumed silica has been found to allow significant deposition of the beneficial agent without compromising processing. In a second embodiment, the invention comprises stick compositions comprising mixtures of the wafers of the invention and wafers containing defined surfactant systems. The invention further comprises a process for forming the wafers of the invention and a method for improving the deposition and compromising the processing using the wafers of the invention.

Description

ADDITIVE COMPOSITION TO SUPPLY A BENEFICIAL AGENT AND CLEANING BARS CONTAINING SUCH ADDITIVES FIELD OF THE INVENTION The present invention relates to stick-like compositions, particularly synthetic soap bar compositions, capable of delivering beneficial agents (eg, silicone), in amounts greater than previously possible. In particular, the invention relates to additive compositions (eg, soap wafers) comprising a beneficial agent, which are then mixed with non-beneficial agent wafers prior to milling, extruding and stamping the bars. The invention also relates to a method for making the additives.

BACKGROUND OF THE INVENTION For a long time it has been a desirable object to provide some type of beneficial agent (eg, silicone or other oils) to the skin through a personal washing composition.

In liquid cleaners, for example, cationic hydrophilic polymers such as Polymer JR (R > Amerchol or JaguarIR) from Rhone Poulenc have been used to improve the delivery of beneficial agents (EP 93,602; WO 94/03152; and WO 94/03151 ). In the co-pending application of series applicants No. 'of the United States 08 / 412,803 of Tsaur et al. , the separated hydrogel particles act as a structure to trap the beneficial agent in concentrated form. The supply of beneficial agents (for example, silicone) in bar-like compositions has proven to be much more difficult for a number of reasons. If the beneficial agent is soluble in any component of the stick composition for example, it can simply be removed in these components during the intermittent mixing phase (before cooling and wafer formulation) and neither the beneficial agent nor an insufficient amount of beneficial agent will be present in the final bar (after the grinding, mixing and extrusion of the wafers) that will be delivered to the skin. An excessively soluble beneficial agent can also reduce the viscosity and cause improper mixing. If the beneficial agent is too viscous, on the one hand, it tends to enter the processing equipment and becomes difficult to process. U.S. Patent No. 5,154,849 to Visscher et al. Teaches stick compositions containing an auxiliary silicone skin / moisture component for the skin. In one embodiment, the silicone component can be mixed with a carrier, which is selected to facilitate incorporation of the silicone. The preferred vehicle is said to be polyethylene glycol. In column 16, the reference describes the silicone being. mix in. Molten carbonaceous (polyethylene glycol), the mixture is cooled to form flakes, and the flakes are preferably added to an amalgamator. However, it is clear that the reference by Visscher et al. Contemplates a silicone / vehicle system different from the bene fi cial agent system / smoked vehicle of the present invention. First, the Visscher patent does not teach fumed silica, a critical component of the additive compositions and which is believed to provide the structure required to retain and absorb the beneficial agent (e.g., silicone). Second, as suggested above and as shown in Figures 1 and 2, the structure of the vehicle / silicone wafer is different. The Visscher wafer et al. It does not contain silicone in discrete drops, but rather flows and surrounds the vehicle. In contrast, the beneficial agent drops of the invention are discrete drops retained within the wafer. This helps ensure that silicone does not flow and interfere with processing. It is believed that the discrete particles of the invention, in turn, are present for two reasons. The first, as noted above ,. is the presence of fumed silica which, although not bound by theory, is believed to help to work with the vehicle (ie, PEG) to better catch the silicone. The second is that, unlike the system of Visscher et al., The present invention requires that there be an equal or more amount of the vehicle relative to the beneficial agent. In contrast, it appears from Visscher et al., Where 4.99kg of silicone (column 15, lines 1-2), were mixed with 2.27 to 2.72kg of Carbowax (column 15, line 29), which probably exists in an excess from silicone to PEG, and at least, there is no recognition of the critical aspect of having an equal or greater amount of PEG to silicone.

In summary, the wafers of the reference Visscher are extremely difficult to process since there is no control with respect to the amount of silicone used and there is also no use of fumed silica.

BRIEF DESCRIPTION OF THE INVENTION Unexpectedly, applicants have found that, when specific additives are made that contain an equal or greater amount of po 1 to 1 to 1 to 1 beneficial agent and also contain fumed silica, the beneficial agent (e.g. silicon) is prepared in the form of discrete drops, which in turn allow the beneficial agent to be processed much more easily. Specifica the invention comprises a wafer composition comprising: (a) from 40% to about 80% by weight of the polyalkylene glycol wafer composition having a molecular weight greater than about 4,000, preferably from 5,000 to 20,000 and more preferably from 5,000 to 10,000; (b) from 10% to 40% by weight of the wafer composition of the beneficial agent (eg, silicone); (c) from 0.01% to 10% by weight of a fumed silica wafer composition; "(d) from 0.0% to 10% by weight of the wafer composition, preferably from 0% to 5% by weight of water, and (e) from 0% to 15% by weight in the fatty acid wafer composition from Cg to C22 In a second embodiment of the invention, the invention comprises an extruded stick composition produced using 20% to 40% wafers as described above and from about 80% to 60% wafers comprising approximately 5% to 90% by weight of a surfactant system, wherein the surfactant is selected from the group consisting of soap, anionic surfactant, nonionic surfactant, amphoteric surfactant, zwitterionic surfactant, cationic surfactant and mixtures thereof. The "soap and / or surfactant" wafers may also comprise other components typicafound in such wafers, such as, for example, minor amounts of fragrance, preservative (eg, butylated hydroxytoluene), polymer of skin sensation (for example, guar), etc. Although the surfactant system of the second wafer (which contains no additive) can be a pure soap surfactant system, preferably the surfactant system includes: (a) a first synthetic surfactant, which is a anionic surfactant; and (b) a second surfactant i vq. synthetic selected from the group consisting of a second anionic surfactant different from the first, a nonionic, an amphoteric and mixtures thereof. A particularly preferred surfactant system comprises cyclohexane as the first anionic surfactant and a sulf or succinate or a betaine surfactant or mixtures of the two. _ In. a third embodiment of the invention, the invention comprises a method for making a beneficial agent containing wafers comprising: (a) from 40% to 80% polyalkylene glycol; (b) from 10% to 40% beneficial agent; (c) from 0.01% to 10% smoked silica; (d) from 0 to 10 of water; and (e) from 0% to 10% of fatty acid from Cs to C22, such method comprises mixing the ingredients at temperatures above the melting point of po 1 to 1 to 1 to 1 to 1 (ie, above) about 50 ° C) for 1 to 60 minutes; cooling on a cooling roller (at about 0 ° C to 25 ° C); and pick up.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a photomicrograph of a wafer produced following the process described in U.S. Patent No. 5,154,849 to Visscher et al., Wherein the wafer is flooded with water and photographed under a microscope. Silicone does not form discrete particles, but forms a large silicone layer surrounding the polyalkylene glycol. The viscous silicone is trapped in the machine and inhibits processing. Figure 2 is a microphotograph of a wafer product according to the present invention. As seen, the beneficial agent is in discrete drops. Furthermore, it is obvious that there is much less beneficial agent present (for example, to interfere with processing) than in Figure 1.

DETAILED DESCRIPTION OF THE INVENTION In one embodiment of the invention, the present invention relates to novel soap wafer compositions (e.g., in the bar making process, molten compositions are formed, which are then cooled in what is commonly referred to as a roller). cooling, to form flakes or wafers, these wafers are subsequently refined and / or extruded to form tubes, which are stamped and cut to form end bars), which are easily processable in a conventional soap machine, while still showing the significant deposition of the beneficial agent (ie, comparable with the deposition obtained in washes for the liquid body). As can be seen in Figures 1 and 2, carefully controlling the level of beneficial agent (so that it can not exceed the level of alkylene glycol vehicle) and using fumed silica (although it is not intended to be bound by theory, it is believed that fumed silica forms three three-dimensional networks, alternating the flow properties of, for example, silicon, and causing thickening), applicants have been able to provide discrete drops of beneficial age, so that the agent is unable to stick to the machine and significantly inhibit processing.

COMPOSITION OF OBLATE Polyalkylene glycol The first component of the wafer composition is the polyalkylene glycol carrier. This vehicle should comprise from about 40% to 80% by weight / preferably from about 50% to 70% by weight of the wafer composition. Preferably, the polyalkylene glycol should have a molecular weight greater than 4,000 to about 100,000, preferably 4,000 to 10,000. A vehicle-especially preferred is polyethylene glycol, for example, Carbowax PEG 8000 (R) from Union Carbide.

Charitable Agent The "charitable agent" composition of the present invention must be a single beneficial agent component or may be a charitable agent compound added through a carrier. In addition, the beneficial agent composition may be a mixture of two or more compounds, one or all of these may have a beneficial aspect. In addition, the same beneficial agent can act as a vehicle for other components where it is desired to add to the bar composition. The beneficial agent can be an "emollient oil" through which a substance that softens the skin is illustrated. (stratum corneum) increasing in water content and keeping it mild by delaying the reduction of water content. Preferred emollients include: (a) silicone oils, gums and modifications thereof such as linear and cyclic polydimethylsiloxanes; amino, alkyl, and aryl silicone oils; (b) fats and oils including natural fats and oils such as jojoba, soybean, rice, avocado, almond, olive, sesame, persic, castor, cone, mink oils; caco fat; bait of beef; butter; hardened oils obtained by hydrogenation of the aforementioned oils; and synthetic mono, di and triglycerides such as glyceride-of myristic acid and 2-ethylhexanoic glyceride; (c) waxes such as carbauba, 'whale white, beeswax, lanolin and derivatives thereof; (d) hydrophobic plant extracts; (e) hydrocarbons such as paraffins. liquid, petrolatum, microcrystalline wax, ceresin, squalene, pristan and mineral oil; (f) higher fatty acids such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic, linolenic, lanolic, isostearic and polyunsaturated fatty acids (PUFA) acids; (g) higher alcohols such as lauryl, cetyl, stearyl, oleyl, behenyl, cholesterol and 2-hexydecanol alcohols; (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 such as mint, jasmine, camphor, white cedar, sour orange peel, ryu, turpentine, cinnamon, bergamot, citrus unshiu, aromatic calamus, pine, lavender, laurel, clove, hibis, eucalyptus, lemon, milk of chicken, thyme, pepper, rose, sage, menthol, cineol, eugenol, citral, citronella, borneol, linalool, geraniol, herb ass, camphor, thymol ,. Spirantol, Penne, Limonene and terpenoid oils; (j) lipids such as cholesterol, ceramides, sucrose esters and p eudocytes as described in European Patent Specification No. 556,957; (k) vitamins such as vitamin A and E, and vitamin of alkyl esters, including those alkyl esters of vitamin C; (1) sunscreens such as octyl toxin cinnamate (Parsol MCX) and bu t i lme t oxibenz or i-methane (Parsol 1789); (m) phospholipids; and (n) mixtures of any of the above components.

A particularly preferred beneficial agent is silicone, preferably silicones having a viscosity greater than about 10,000 centipoise. The silicone can be a rubber and / or it can be a mixture of silicones. An example is ps 1 i dime t i 1 s i 1 oxano having a viscosity of about 60,000 centistokes. The benefit agent generally comprises from about 10% to 40%, preferably from 20% to 40%, more preferably from 25% to 40% by weight of the wafer composition.

Smoked Silica Smoked silica is generally produced through the hydrolysis of silicon tetrachloride vapor in a hydrogen and oxygen flame. The process produces particles of approximately 7 to thousand imi eras. Huge surface area and chain formation abilities are thought to allow it to form three-dimensional networks, alternating fluid properties, that is, causing thickening. The fumed silica will generally comprise from 0.01 to 10% by weight of the composition, preferably from 1% to 7% by weight, more preferably from 1% to 5% by weight of the composition.

Other Components Water comprises from 0 to 10% preferably from 0 to 8% by weight, more preferably from 0-1 to 5% by weight of the wafer composition. Sometimes it is preferred to have little or no additional water (as opposed to being inherently present in the compounds') in the wafer mixture, since this can sometimes cause difficulties in the wafer. prosecution. In addition, the wafer composition may comprise from 0% to 15%, preferably from 2% to 10%, of fatty acid, ie, fatty acid from Cs to C22. Generally, this is a saturated, straight-chain fatty acid, although this is not necessarily the case. The fatty acid helps modify the wear rate of the emollient wafer to better match that of the base soap.

BAR COMPOSITIONS In a second embodiment of the invention, the invention comprises extruded stick compositions wherein from 20% to about 40% of the wafers used to make the final bars comprise the beneficial agent additives (i.e., wafers) described above , and where 80% to 60% of the wafers comprise wafers comprising the surfactant system defining the final bar. Specifically, the surfactant system wafers comprise about 5% to 90% by weight of a surfactant system, wherein the surfactant is selected from the group consisting of soap (surfactant surfactant systems are included). of pure soap), anionic surfactant, nonionic surfactant, zwitterionic co-anionic surfactant, cationic surfactant and mixtures thereof. These wafers may further comprise other components typically found in the final bar compositions, for example, smaller amounts of fragrance, preservative, skin feel polymer, etc.

Surfactant Agent System The term "soap" is used herein in its popular sense, that is, the alkali metal or alkanolammonium salts of aliphatic alkane or alkenic monocarboxylic acids. Sodium, potassium, mono-, di- and t-i-t-anol ammonium cations or combinations thereof are suitable for the 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 can be from potassium soaps. The soaps useful herein are the well-known alkali metal salts of synthetic aliphatic acids (alkanoic or alkenoic) having from about 12 to 22 carbon atoms, preferably from about 12 to about 18 carbon atoms. These can be described as alkali metal carboxylates of acrylic hydrocarbons having from about 12 to about 22 carbon atoms. Soaps that have the fatty acid distribution of coconut oil can provide the lower end of the broad molecular weight scale. Those soaps having the fatty acid distribution of peanut oil or rapeseed, or their hydrogenated derivatives, can provide the upper end of the broad molecular weight scale.

It is preferred to use soaps having the fatty acid distribution of the coconut oil or bait, or mixtures thereof, since these are among the most readily available fats. The proportion of fatty acids that have at least 12 carbon atoms in the coconut oil soap is approximately 85%. This ratio will be higher when mixtures of coconut oil and fats such as bait, palm oil, non-tropical nut oils or fats are used, where the main chain lengths are C i β and larger. The soap, preferred for use in the compositions of this invention have at least about 85% fatty acids having about 12 to 18 carbon atoms. The coconut oil used for the soap can be replaced all or in part by other oils "with a high content of haluric acid", that is, oils or fats where at least 50% of the total fatty acids are composed of acids lauric or myristic and their mixtures. These oils are usually illustrated by tropical nut oils of the coconut oil class. For example, these include: pomace palm oil, babassu oil, ouricuri oil, tucum oil, cohune nut oil, muru uru oil, jabotí seed oil, khakan nugget oil, walnut oil dika and ucu'huba butter. A preferred soap is a blend of approximately 15% to about 20% coconut oil and about 80% to about 85% bait. These mixtures contain about 95% fatty acids having approximately 12 to 18 carbon atoms. The soap can be prepared from coconut oil, in which case the fatty acid content is about 85% with a chain length of C 2-Ci 8 The soaps can contain unsaturation according to commercially available standards. Excessive unsaturation is usually avoided. The soaps can be made through conventional container boiling processes, or modern continuous soap making processes, where natural fats and oils such as bait and coconut oil or their equivalents are saponified with an alkali metal hydroxide using well processes. known to those skilled in the art. Alternatively, the soaps can be made by neutralizing fatty acids, such as lauric (C? 2), myristic (C_.), Palmitic (Cie) or stearic (C? 8) acids, with an alkali metal hydroxide or carbonate. The active anionic detergent which may be used may be aliphatic sulphonates such as a primary alkan sulfate (for example, Cs_C22), at 1 primary cellulose (for example, Cg-C22), at 1 in 1 of Cs-C22, hi dr oxia 1 with its 1 folate of Cs ~ C22 or alkylglyceryl sulphonate ether "(AGS), or aromatic sulphonates, such as Iqui Ifoencen-sulfonate.The anionic can also be an alkylsulfate (for example, C? 2-C? alkyl sulfate) or alkyl ether sulfate (including ether sulfates at 1 qu 1 g 1 iceri 1 i co s), among the alkyl ether sulphates are those having the formula: RO (CH 2 CH 20) n S 0 3 M in where R is an alkyl or alkenyl having from 8 to 18 carbon atoms, preferably from 12 to 18 carbon atoms, n has an average value greater than 1.0, preferably greater than 3, and M is a cation of solubilization, such as sodium, potassium, ammonium or substituted ammonium.Lauryl ether sulfates are preferred of ammonium and sodium. The anionic may also be alkylsulfo-succinates (including mono- and dialkyl, eg, C6-C22 sulfosuccinates); alkyl, acetic acid, alkyl and 1 sarcosine, its 1 fatty acids, at 1 qui 1 C8-C22 phosphates and phosphates, alkyl phosphate esters and phosphate esters, alkyloxy alkoxy, at 1 to 1 acetates , monoal qui 1 succina tosy maleates of C8-C22r s ul f oace tat os, to 1 qu i 1 ucós i do syaci 1 iiseti ona cough. The sulfosuccinates may be ona 1-1-sulfosuccinates having the formula: R402CCH2CH (S03M) C02M; and MEA-amide sulfosuccinates of the formula: R4CONHCH2CH202CCH2CH (S03M) C02M wherein R4 varies from Cs-C22 alkyl and M is a solubilization cation. Sarcosinates are generally indicated by the formula: R 'CON (CH3) CH2C02M, wherein R1 varies from Cs ~ C22 alkyl and M is a solubilization cation. Taurates are generally identified with the formula: R2CONR3CH2CH2S03M wherein R2 is alkyl ranging from Cs-C2o-R3 is alkyl ranging from C _.- C and M is a solubilizing agent.

Particularly preferred are Cß-Ci acyl isethionates. These esters are prepared through the reaction between alkali metal isethionate with mixed aliphatic fatty acids having from 6 to 18 carbon atoms and an iodine value of less than 20. at least 75% of the mixed fatty acids have from 12 to 18 carbon atoms and up to 25% have from 6 to 10 carbon atoms. The acyl isethionates, when present, will generally vary from about 10% to 70% by weight of the total bar composition. Preferably, this component is present from about 30% to about 60%. The acrylate can be an alkoxylated isethionate as described by Ilardi et al., U.S. Patent No. 5,393,466, incorporated herein by reference. This compound has the general formula: O X Y R C-O-CH-CH, - (OCH-CH2) m-S03M wherein R is an alkyl group having from 18 carbon atoms, m is an integer from 1 to 4, and X and Y are hydrogen or an alkyl group having from 1 to 4 carbon atoms and M + is a monovalent cation such as, for example, sodium, potassium or ammonium. Amphoteric detergents that can be used in this invention include at least one acid group. This can be a carboxylic or sulfonic acid group. These include quaternary nitrogen and, therefore, are quaternary amino acids. Generally, they should include an alkyl or alkenyl group of 7 to 18 carbon atoms. Usually, they will be in accordance with the total structural formula: O R? R -C-NH (CHa) B-] B-Nf-X-Y wherein R1 is alkyl or alkenyl of 7 to 18 carbon atoms; R2 and R3 each are independently alkyl, hydroxyalkyl or carboxyalkyl of 1 to 3 carbon atoms; m is from 2 to 4; n is from 0 to l; X is alkylene of 1 to 3 carbon atoms, optionally substituted with hydroxyl, and Y is -C02- or -SO3- Suitable amphoteric detergents within the above general formula include simple betaines of the formula: R2 R3 and ami dobe t ai na s of the formula R2 I R1 - CONH (CH2) n-N * -CH2CO, - R * where n is 2 or 3. In both formulas, R1, R2 and R3 are as previously defined. R1 may be in particular a mixture of C_2 and C4_4 alkyl groups, coconut derivatives, such that at least one half, preferably at least three quarters of the R1 groups, have 10 to 14 carbon atoms. carbon. R2 and R3 are preferably methyl.

A further possibility is that the amphoteric detergent is a sulfobetaine of the formula: r, 2 R1-N + - (CH, .3S03- Rz R1 - CONH (CH2) m-N + - (CH2) 3S03- R3 where m is 2 or 3, or variants of these where - (CH2) 3SO3"is replaced by OH In these formulas R, R2 and R are as previously discussed. The non-ionic agent, which can be used as the second component of the invention, includes 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. The specific nonionic detergent compounds are alkylphenols (Ce-C22). condensates of ethylene oxide, the condensation products of alcohols, primary or secondary, linear or branched aliphatic (C8-Cis) with ethylene oxide, and products made through the condensation of ethylene oxide with the reaction products of oxide of propylene and ethylenediamine. Other so-called non-ionic detergent compounds include long chain tertiary amine oxides, long chain tertiary phosphine oxides and dialkyl sulfoxides. The non-ionic detergent can 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., Which is incorporated herein by reference or may be one of the sugar amides described in the US Patent No. 5,389,279. United States No. 5,009,814 to Kelkenberg, incorporated herein by reference.

Examples of cationic detergents are quaternary ammonium compounds, such as alkyldimethylammonium halides. Other surfactants that can be used are described in U.S. Patent 3,723,325, Parran Jr., and "Surface Active Agents and Detergents" (Vol. I and II) by Schwartz, Perry & Berch, both also incorporated here for reference. Although the bar may be a bar of pure soap, preferably the surfactant system of this wafer (forming the surfactant system in the bar) comprises: (a) a first synthetic surfactant which is anionic; and (b) a second synthetic surfactant selected from the group consisting of a second anionic surfactant other than the first, a nonionic, an amphoteric and mixtures thereof. The first anionic surfactant can be any of those presented above, but preferably is isethionate from Cs to CÍO as discussed above. Preferably, the agent will comprise from 10% to 90% by weight of the total bar composition.

The second surfactant preferably is sulfosuccinate, a betaine or mixtures of the two. The second surfactant or surfactant mixture will generally comprise from 1% to 10% of the total bar composition. A particularly preferred composition comprises sufficient sulfosuccinate to form 3-8% total bar compositions and sufficient betaine to form 1-5% of the total bar composition.

Processing In general, the additive, the beneficial agent wafers are formed by mixing the ingredients in a mixer at a temperature just above the melting point of the polyalkylene glycol (eg, about 50 ° C, and more, generally not more than about 110 ° C), for approximately 1 to 60 minutes, and then cooling on a cooling roller. The order of addition is not critical. The "no" beneficial agent wafers are formed by mixing similarly and with cooling. The wafers are then combined, for example, in a hopper or ribbon mixer, where they can be refined (for example, processed to a more flexible mass), extruded into bills, stamped and cut. In a third embodiment of the invention, the invention is. refers to a method for forming additives (wafers) containing a beneficial agent, such method comprises: (a) mixing a polyalkylene glycol, the beneficial agent, fumed silica, optional water and optional fatty acid in a container for 1 to 60 minutes, approximately more than 50 ° C; and (b) cooling the mixture on a cooling roller of about 0 to 25 ° C to form the wafers. The following examples are intended to further illustrate the invention and are not intended to limit the same in any way. Unless otherwise specified, all percentages are percentages by weight.

EXAMPLES Protocol A silicone measurement was conducted as follows: The analysis was performed through the method known as ICP (Inductively Coupled Argon Plasma). This process requires a step that involves extraction with xylene, and, therefore, is currently used only in vitro. The ICP technique employed a Thermo Jarrell Ash Atom Sean 25 scanner with the measurements being at 251,612 nm. Additional ICP measurement parameters are given below. The treatment process was as follows: Pig skin was shaved, filled with dermatomes and divided into 25 cm pieces before treatment. The skin sample was then treated, rubbing the bar sample through the skin 10 times, and in a back-and-forth motion. The resulting liquor on the skin was foamed for 30 seconds and then rinsed 10 seconds with water, which was adjusted to a temperature of 32.2-35 ° C (90-95 ° F). The treated skin sample was placed in a borosilicate silicate flask containing 10 ml of xylene. Samples were placed on a platform shaker for 1 hour to allow removal of the silicone. After the extraction period, the skin was removed from the vial and the extract was analyzed using the ICP technique. The sample solutions were tested against a 10 pm silicone standard.

Typical ICP Measurement Parameters for Measuring Silicon in Xylene E j emple 1 Using the protocol described above, deposition of the beneficial agent (eg, silicone deposition) was measured in compositions representing (1) the Visscher bar et al., Without fumed silica wafers; (2) the bars of the invention, which not contain smoked silica wafers; and (3) a liquid body wash composition. Each is discussed in more detail below: (1) Visscher bar (WO 92/08444) The Visscher bar was obtained following the process taken from WO 92/08444 (equivalent to U.S. Patent No. 5,154,849) , where 'polyethylene glycol was used as a vehicle for the silicone in the bars (procedure performed in a Patterson mixer). The process was as follows: (a) 681 g of Carbowax PEG 8000 were melted and maintained at about 60 ° C; (b) 400 g of GE 350 cps of silicone se. they added; and (c) 273 g silicone cps of GE 500,000 were added. (The patent explains that the vehicle will be 10: 9 silicone A: PEG where silicone A is a mixture of 40:60 silicone rubber, 500,000 cps silicone fluid, 350 cps). The mixture remained in the mixer for 45 minutes until it was considered homogeneous. The mixture was then stirred and placed on a cooling roller set at 7 ° C. The resulting "wafers" were soft, flexible and severely sticky. The silicone covered the entire surface of the equipment.

A sample bar was prepared by mixing the surfactant wafer: Visscher wafer ratio of 4: 1 (wherein the surfactant wafer comprises 40-60% fatty acid isethionate, 20-30% fatty acid, -10% sodium isethionate, 1-10% sulfosuccinate, about 5% betaine, preservatives, dyes and minor amounts); and extrude a tube with a Weber Selander extruder. The resulting tube was smooth and the experience not consider it a viable product. The compressed bar formed a poor foaming. From experience, this type of "wafer" can not be produced using conventional equipment. More specifically, the mixing of the surfactant wafers and the Visscher wafers at a weight ratio of 4: 1, respectively, resulted in large cakes of non-free flow, which were adhered together by the silicone on the surface. This result prevented feeding to the extruder. The material that was not fed was extruded as a sticky, soft tube. When stamped, the bar had a poor surface, was sticky and produced very little foaming when wet.

Bar of the Invention The bar of the invention comprises a 70% / 30% blend of wafers, wherein 30% of the additive wafer component had the following formulation scale: 40-100%, preferably 40.8-0% polyethylene glycol (for example, PEG 8000); 10-50%, preferably 10-40% polydimethylsiloxane of 60,000 centistokes; from 0.1 to 10%, preferably from 1 to 5% of Cab-o-Sil (R), fumed silica (for example, silica_ smoked 45-5); 0-20%, preferably 1-10% deionized water; and _ 0-20% _, preferably 0-10% of C8 to C22 fatty acid and 70% of the surfactant wafers were similar to the surfactant wafers used in Visscher et al. rod. , as follows: about 40-60% by weight of fatty acid isethionate; about 20-30% by weight of fatty acid; about 1-10% by weight of sodium isethionate; about 1-10% by weight of sulfosuccinate; about 5% by weight of betaine; and the rest are preservatives, dyes, water and other minor components. A preferred benefit agent wafer comprises the following: (a) 55-65% PEG (b) 25-40% silicone (c) 1-7% silica; and (d) 0-8% deionized water. The wafers were mixed, extruded together in the ratios identified above, and extruded into bars. (3) Liquid Body Wash The liquid wash for the body had the following formulation: As noted, the deposition results were taken using ICP techniques discussed above and the results are set forth below: Dep i s i c io n Visscher bar 2.16 + / - 0.48 μg / cm2 Bar of the Invention 2.24 + / - 0.83 μg / cm2 Liquid 2.14 + / - 0.62 μg / cm2 - It is surprising that the bar can also be deposited like liquids. In addition, in contrast to Visscher, the bar of the invention was easily processable and did not cover the machine (see E j emp lo 2).

E j empl o 2 To further show the differences between the bar of the invention and the Visscher bars, the applicants decided to aze the wafers more closely. The wafers used in the formation of the Visscher bar et al., And the wafers carrying the beneficial agent and used in forming the rods of the invention were microphotographed. As seen in Figures 1 and 2, the wafers of Visscher et al., (PEG) show large "globules" of silicon surrounding the alkylene glycol, while the wafers of the invention sample discrete small drops of silicone. Although not intended to be bound by theory, it is believed that the difference in amount of silicone and how it is formed represents the strongest processing difficulties experienced to form P & G bars relative to those of the invention. As noted above, a 4: 1 ratio of Visscher wafers to surfactant wafers formed large cakes of nonfree flow, which obstructed wafer feed to the extruder and nodule processing. The cakes also caused agglomeration in the vacuum chamber, which significantly reduced tube formation. In addition, as noted, the material that was extruded was smooth and sticky, and when stamped, the bar had a poor surface, was sticky and produced very little foaming when wetted.

Claims (10)

1. A soap wafer composition comprising: (a) from 40% to about 80% by weight of the alkylene glycol wafer composition having a molecular weight of about 4,000 to 100,000; (b) from 10% to 40% by weight of the beneficial agent in the wafer composition; (c) from 0.01 to 10% by weight of fumed silica - in the wafer composition; (d) from 0 to 10% by weight of the water in the wafer composition; and (e) from 0% to 15% by weight of the fatty acid of C3 to C22 in the wafer composition.

2. The composition as claimed in claim 1, wherein the molecular weight is from 5,000 to 10,000.

3. The composition as claimed in claim 1 or claim 2, wherein the polyalkylene glycol is propylene glycol.

4. The composition as claimed in any of the preceding claims, wherein the beneficial agent is silicone.

5. An extruded toilet bar composition comprising 20-40% wafers complies: • (a) from 40% to about 80% by weight polyalkylene glycol in the wafer composition having a molecular weight of about 4,000 to 20,000; (b) from 10% to 40% by weight of the beneficial agent in the wafer composition; (c) from 0.01 to 10% by weight of fumed silica in the wafer composition; (d) from 0 to 10% by weight of the water in the wafer composition; and (e) from 0% to 15% by weight of the fatty acid of C8 to C22 in the wafer composition, and from 80.% to 60% of the wafers comprising from 5% to 90% of a surfactant system, wherein the surfactant is selected from the group consisting of soap, anionic surfactant, nonionic surfactant, amphoteric surfactant, cationic surfactant and mixtures thereof.

6. The composition as claimed in claim 5, wherein the surfactant system comprises: (a) a first anionic surfactant; and (b) a second surfactant selected from the group consisting of a second anionic different from the first, an ionic, a. amphoteric and its mixtures.

7. The composition as claimed in claim 6, wherein the first anionic surfactant is acyl isethionate; optionally wherein the isethionate from 10% to 70% is the final bar composition.

8. The composition as claimed in claim 6, wherein the second surfactant is either (i) s or 1 f or succine or (ii) betaine, optionally wherein the betaine is amidococoylbetaine; or (iii) a mixture of sulfosuccinate and betaine.

9. A process for forming a wafer, which comprises: (a) from 40% to about 80% by weight of 1 to 1 weight in the wafer composition having a molecular weight of about 4,000 to 20,000; (b) from 10% to 40% by weight of the beneficial agent in the wafer composition; (c) from 0.01 to 10% by weight of fumed silica in the wafer composition; (d) from 0 to 10% by weight of the water in the wafer composition; and (e) from 0% to 15% by weight of the fatty acid of C8 to C22 in the wafer composition, wherein said process comprises mixing the ingredients of subparagraph (a) - (e) for 1 to 60 minutes at a temperature above about 50 ° C, and then cooling such mixture on a cooling roller at a temperature of 0 ° C to 25 ° C.

10. A method for improving the deposition of the beneficial agent from a stick composition without compromising the friction, the method comprises using in such bar compositions about 20% to 40% of wafers comprising: (a) from 40% to about 80% by weight of -polyalkylene glycol in the wafer composition having a molecular weight of approximately 4,000 to 100,000; ~ (b) from 10% to 40% by weight of the beneficial agent in the wafer composition; (c) from 0.01 to 10% by weight of fumed silica in the wafer composition; (d) from 0 to 10% by weight of the water in the wafer composition; and (e) from 0% to 15% by weight of the fatty acid from Os to C22 in the wafer composition.