MXPA97006089A - Compositions for personal care and cleaning products containing the composition - Google Patents

Abstract

The present invention relates to personal care compositions that are especially suitable for personal cleansing of the perineal area and protection against perineal dermatitis. Preferred compositions include water, dimethicone, a polymeric emulsifier and optionally a water soluble polyol, a pH adjusting agent, an antimicrobial agent, and a chelating agent. Disposable cleaning products containing a non-woven substrate or other substrate, impregnated with the composition are also described.

Description

COMPOSITIONS FOR PERSONAL CARE AND PRODUCTS OF CLEANING CONTAINING THE COMPOSITIONS FIELD OF THE INVENTION The present invention relates to personal care compositions, more particularly to personal cleansing and / or skin treatment compositions. The compositions are useful, for example for perineal cleaning and protection against perineal dermatitis.

BACKGROUND OF THE INVENTION Perineal dermatitis (including diaper rash), has been defined as contact dermatitis in the perineal area, including the perineum, the buttocks, and the perineal, coccyx, and upper / inner thigh regions (Brown DS, Sears M. , Perineal Dermatitis: A Conceptual Framework, Ostomy / Wound Management 1993, 39 (7), 20-25). The physical signs of perineal dermatitis may include one or a combination of erythema, inflammation, exudation, vesiculation, crusting and peeling with the possibility of scaling, thickening and hyper-pigmentation over time (Brown). It is believed that perineal dermatitis is caused by prolonged contact of the skin with bodily debris such as urine and faeces. Although the exact component or components of the body stripping responsible for perineal dermatitis have not been identified, it is suspected that the factors that cause perineal dermatitis include ammonium, moisture, bacteria, urine pH and Cadida albicans. Because these various suspect factors have different properties and require different therapies, one of the most effective methods of treating perineal dermatitis has been the application of a topical protective barrier agent between the skin and body stripping. Several topically applied barrier agents are or have been commercially available. Exemplary agents are listed, for example, in the patent of the United States 5,043,155 issued to Puchalski et al. On August 27, 1991. Such agents are typically in the form of powders, lotions, creams and ointments and may contain a variety of ingredients. For example, the agents listed in U.S. Patent 5,043,155 may contain a calcium decyanate, talc, starch, calcium carbonate, pretolate, cod liver oil, vitamins A and D, lanolin balm, silicone, including dimethicone, zinc oxide, bismuth subnitrate, benzalconium chloride, methyl benzetonioum chloride, and protein hydrosylate containing amino acids. Skin protective agents, for example, dimethicone, are also described in Federal Register Vol. 48, No. 32 February 15, 1983, pages 6820-6833 (proposed rule of the U.S. Dept. of Health and Human Services, Federal Food and Drug Administration). Skin-protecting drug products, such as products for the rash caused by the skin, which may include, for example, dimethacone, are discussed in the Federal Register, June 20, 1990, pages 25204-25232 (proposed rule of US Dept. of Health &Human Services, Federal Food and Drug Administration). The known personal cleansing compositions may contain very small amounts of anti-foaming agent, for example, silicone oils. Such antifoaming agents are typically employed in amounts of less than about 0.01% by weight of the composition. Such small amounts do not provide any significant benefit to the skin. The barrier agents for protection against perineal dermatitis can be applied by spraying the agent on the skin, massaging the material on the skin with the hands, or through a cleaning material. Cleansing materials are typically used to clean while changing the baby's diaper or item for adult incontinence. Disposable cleaning materials are pre-moistened, formed into disposable towels. The cleaning materials are typically of a nonwoven web formed of various combinations of cellulose fibers, synthetic polymer fibers such as polyester, polypropylene, and the like, and binders. The non-woven webs are generally wetted with a composition containing water (94% or more) and various combinations of other ingredients including wetting or moisturizing agents, emollients, surfactants, emulsifiers, antimicrobial agents, skin protectors, setting agents of pH, fragrances, powders and the like, various exemplary ingredients that can be used in disposable baby towels are described in the aforementioned US Pat. No. 5,043,155. As recognized in U.S. Patent 5,043,155, many cleaning materials have historically required separate application of a barrier agent. More recently, the cleaning materials that are said to be cleaned and to carry the skin protector on the skin have become commercially available. An example of such towels are Baby Fresh With Ultra Guard® baby towels. Baby Fresh® baby towels are marketed with an indication of United States Patent 4,904,524 (issued to Yoh on February 27, 1990). It is desirable that, in addition to providing effective cleaning, the towel itself leaves a highly protective substantive residue on the skin. For the purpose of providing maximum protection against perineal dermatitis, it is desirable that the compositions used in the cleansing products be highly homogeneous. In this way, the components must be homogeneously distributed in the composition to provide consistent application of the composition to, or distribution of the composition in, the cleaning substrates, the skin, or other surfaces. It is also desirable that the compositions rapidly demulsify upon application to the skin, and resist re-emulsification after said application. The residue left by a towel or cloth (cleaning material) must also have several properties. The waste must protect the skin against the irritants that accompany the corporal waste, still it must not significantly reduce the transepidermal moisture loss, that is, the skin must be allowed to breathe even in the presence of the waste (in this way, the residue is not occlusive). Occlusive barrier agents tend to cause excessive hydration of the skin, which makes the skin more susceptible to irritation or infection. Moreover, it is desirable that the residues provide easier cleansing of the perineal region. In addition, it is often desirable for the waste and the cloth or towel to provide a favorable aesthetic, particularly to the touch, perception to the user of the towel (the user of the towel or cloth may be a user of an incontinence article or a caregiver of said user). For example, the residue and the towel should not be excessively greasy, oily, or sticky and should provide an impression of softness or softness. The waste must have a sufficiently low coefficient of friction to minimize the risk of abrasion of the skin, or red marking due to pressure, and to improve the spreading capacity of other protective barrier agents that can be applied. The towel should provide an impression of sufficient moisture and should feel soft and not irritating to the user.

Finally, the composition used in the disposable towel should not adversely impact the physical properties of the nonwoven substrate to excessively reduce its usefulness for the intended application. In addition, the composition must inhibit the growth of a wide range of bacteria, fungi and other micro-organisms. Although the art has provided various compositions having various levels of utility in personal cleansing or treatment for the prevention of peri-neal dermatitis, the art has not provided the desirable characteristics of such compositions in the manner, or to the extent of the present invention. It is therefore an object of the present invention to provide a composition that is useful for personal cleansing and to reduce the risk of perineal dermatitis. More particularly, it is an object to provide such compositions that are highly homogeneous and rapidly de-emulsify upon application to the skin, and do not tend to be re-emulsified, to ensure a substantially uniform, yet non-occlusive, layer of the durable, protective barrier agent. on the skin. It is a further object of the present invention to provide such compositions that are aesthetically pleasing to the user. Another object of the invention is to provide such compositions having a coefficient of friction that is low enough to minimize the risk of abrasion of the skin or red marking due to pressure, to provide subsequent easier skin cleansing, and to improve the ability to spread other protective barrier agents that can be applied. It is another object of the invention to provide a method for manufacturing such compositions. Still another object of the invention is to provide cleaning products containing the composition, more particularly a cleaning product which provides effective cleaning and which also leaves a highly protective, long-lasting residue on the skin.

Another object of the invention is to provide a cleaning product that is gentle and non-irritating to the user.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to compositions for cleaning and leaving a protective residue on the skin of a person, the composition being especially useful for reducing the risk of perineal dermatitis, the compositions contain water, a silicone oil and an emulsifier. Preferred compositions also include a water soluble polyul, a pH adjusting agent, a microbial agent and / or a chelating agent.

The components combine to provide a stable, pleasant-to-touch, non-irritating lotion, which can quickly de-emulsify upon application to the skin and remain de-emulsified to leave a substantially uniform protective layer of the silicone oil on the skin. Silicone oil tends to reduce the risk of perineal dermatitis, red marking due to pressure, and abrasion of the skin, and tends to help in the removal of body waste and in the application of other topical agents. In preferred embodiments, the silicone oil includes dimethacone and the emulsifier is a polymeric emulsifier, more preferably a polymeric carboxylic acid emulsifier, most preferably comprising a cross-linked alkyl acrylate polymer of acrylates. The preferred antimicrobial agent includes a mixture of 1,3-bis (Hydroxymethyl) -5,5-dimethylhydantoin, and 3-iodo-2-propyl butyl carbamate. The present invention also relates to the use of the compositions in combination with a substrate to effect cleaning, treatment or other uses. In a preferred embodiment, the composition is pre-combined with the substrate to form a cleaning product, for example, disposable tolls, to be used for said purpose at a later time. In a preferred embodiment, the cleaning product includes a nonwoven substrate impregnated with the composition. The preferred cleaning products tend to be resistant to a wide range of micro organisms, such that the cleaning products have a good storage life. The cleaning products also tend to be soft in relation to cleaning products that do not contain the silicone oil, or cleaning products that do not incorporate silicone oil substantially throughout the cleaning product. The invention also relates to methods for making the compositions. A preferred method involves adding the pH adjusting agent at the end of the process of making the composition, or before an optional dilution step. The preferred method also uses a relatively low shear process to form a silicone emulsion in the composition. The preferred method tends to provide highly homogeneous compositions which rapidly de-emulsify upon application to the skin and which tend to remain un-emulsified to leave a substantially uniform layer of silicone oil on the skin.

DESCRIPTION OF THE PREFERRED MODALITIES The compositions of the present invention are emulsions containing water, a protective barrier agent including a silicone oil, and an emulsifier. In preferred embodiments, the composition also contains at least one additional component selected from water soluble polyols, pH adjusting agents, antimicrobial agents and chelating agents. Additional ingredients may also be included, such as fragrance, skin-assisting aids, moisturizers, humectants and emollients; powders and the like, in the composition.

The water serves as a means to bring the protective barrier agent to the skin in an aesthetically pleasing manner and at an appropriate viscosity. In addition, the water helps wetting the substrate with the cleaning products that incorporate the composition. The water can be deionized water or running water. Water is economically preferred. However, it may be preferred to use deionized water to minimize interference with emulsification due to residues of metals and other residual compounds that can be found in tap water, or otherwise provide control in the manufacture of the composition. The compositions of the present invention generally contain at least about 80%, more preferably at least about 85%, most preferably at least about 90% water, and up to about 99.5% water, by weight of the composition. Particularly preferred compositions contain from about 91% to about 99.5% water, by weight of the composition. Silicone oil is the primary protective barrier agent in the composition. Silicone tends to provide a protective barrier against irritating body waste while at the same time allowing the loss of normal transpidermal moisture, such that the skin does not excessively hydrate. In addition, the silicone oil provides emolliency, lubricates the surface of the skin, and tends to detach the stains thereby facilitating the cleansing of the skin. The silicone oil tends to impart less tack than other emollients that have been used in personal cleansing compositions, for example, animal oils such as lanolin or petroleum-based oils, such as petroleum and mineral oil. Silicone also imparts a soft, smooth, soft feeling to the wearer's skin, and tends to soften the cleansing products that the composition incorporates.

The silicone oils that are useful herein are those that can be stably emulsified. Preferred silicone oils are those that impart a soft and smooth impression to the touch, and that do not impart an oily, oily, oily-coated perception to the touch when incorporated into the composition. Non-volatile silicone oils are preferred over volatile silicone oils. Non-volatile silicones tend to provide cleaning products that remain stable when exposed to the environment, tend to provide a palpable, long-lasting impression, and tend to form a stable, oil-based layer on the skin. You can use mixtures of silicones. For example, volatile silicones can be used in combination with non-volatile silicones to impart the desired aesthetic properties while the composition contains sufficient non-volatile silicone to provide a skin barrier layer that is effective for a given application. Exemplary silicone oils which are suitable for use herein include dimetacona (alternatively referred to as linear polydimethyl siloxane polymer, dimethyl siiicone and the like), substituted linear dimethaconanes, cyclomethicone, dimethiconol, trimethylsiloxysilicate, and mixtures thereof. Said silicones are commercially available, for example from Dow Corning Company of Midland, MI under the trade names fluid Dow Corning 200 (dimethicone), Dow Corning 1401 fluid (cyclomethicone and demeticonol), Dow Corning 593 fluid (dimethicone and trimethylsiloxysilicate), Dow Corning 2503 fluid (stearyl dimethicone). These and other silicone oils which may be suitable for use herein are described in the technical brochure numbered 24-414C-93 and entitled "Regulatory Solutions for Personal Care", Dow Corning Corporation, Midland, MI, 1993. In one embodiment Preferred, the silicone oil is a linear dimethicone or mixture of linear dimethicones, more preferably a linear dimethicone or its mixture having a viscosity on the scale of 50 to 1,000 centistokes (ie, "is"). Exemplary dimethicones are available from Dow Corning under the trade names Dow Coming 200 fluid. In a particularly preferred embodiment, the silicone oil is Dow Corning 200 fluid having a viscosity of about 350 centistokes. It has been found that this silicone oil provides a protective barrier without imparting an excessively oily, greasy or sticky feel to the composition when incorporated in particularly preferred amounts. The silicone oil is used in an amount of at least 0.5% and up to about 10% by weight of the composition with an amount of at least about 0.5% and less than about 5% being preferred. Particularly preferred compositions contain from about 0.5% to less than 3%, more preferably from 0.5% to about 2.5%, most preferably from about 1 to about 2.5% silicone oil based on the weight of the composition. Compositions containing the last silicone content tend to provide a balance of skin protection and particularly suitable aesthetic properties. The composition also includes an emulsifier such as are known in the art of forming oil-in-water emulsions. The emulsifier is preferably a polymeric emulsifier. The polymeric emulsifier is capable of primary emulsification of the composition and of rapidly de-emulsifying during the application of the composition to the skin to form a film of silicone oil on the skin. In addition, the polymeric emulsifier does not tend to re-emulsify once the composition is applied to the skin. This is particularly important, where the composition is going to be used to clean or treat the perineal region, in which region the urine insults that can occur between diaper changes or another device for incontinence are repeated. Since the composition does not remuls to a significant degree, the silicone oil tends to remain on the skin in the form of a protective barrier layer instead of being rinsed by urine and other body fluid. The emulsifier is employed in an amount effective to emulsify the silicone oil and other oils not soluble in water that may be present in the composition (hereinafter alternately referred to as "an effective amount"), • typically a varying amount. from about 0.05% to about 1%, preferably from about 0.05% to about 0.5%, based on the weight of the composition. Particularly preferred compositions of the present invention contain from about 0.1% to about 0.5%, most preferably from about 0.1% to about 0.3%, most preferably from about 0.1 to about 0.2% emulsifier, based on the weight of the composition . Mixtures of emulsifiers can be used. Polymeric emulsifiers which are suitable for use herein include, but are not limited to carboxylic acid polymers which are crosslinked compounds containing one or more acrylic acid-derived monomers, substituted acrylic acids and salts and esters of these acrylic acids, and substituted acrylic acids, wherein the entanglement agent contains two or more carbon-carbon double bonds and is derived from a polyhydric alcohol. Preferred carboxylic acid polymers are of two general types. Also, combinations of these two types of polymers are useful herein. The first type of the preferred carboxylic acid polymer is an entangled homopolymer of an acrylic acid monomer or derivative thereof (for example, wherein acrylic acid has substituents at the carbon 2 positions, and 3 independently selected from the group consisting of C 1 alkyl, CN-COOH, and mixtures thereof). The monomers are preferably selected from the group consisting of acrylic acid, methacrylic acid, ethacrylic acid, and mixtures thereof, with acrylic acid being more preferred. The second type of preferred carboxylic acid polymer is an entangled copolymer having (i) a first monomer selected from the group consisting of an acrylic acid monomer or derivative thereof (as just described in the preceding paragraph), a monomer of short chain alcohol acrylate ester (ie C ^ J or derivatives thereof (e.g. wherein the acrylic acid portion of the ester has substituents on the carbon 2 and 3 positions independently selected from the group consisting of CM alkyl , -CN, -C00H, and mixtures thereof), and mixtures thereof; and (ii) a second monomer which is a long chain alcohol acrylate ester monomer (ie C8.40) or its derivative (e.g., wherein the acrylic acid portion of the ester has substituents at the carbon positions. and 3 independently selected from the group consisting of CM alkyl, -CN, -COOH, and mixtures thereof). The acrylic acid monomer or derivative thereof is preferably selected from the group consisting of acrylic acid, methacrylic acid, ethacrylic acid, and mixtures thereof, with acrylic acid, methacrylic acid, and mixtures thereof being more preferred. The short chain alcohol acrylate ester monomer or its derivative is preferably selected from the group consisting of C alcohol acrylate esters, C 1 alcohol methacrylate esters, C_4 alcohol ethacrylate esters and mixtures thereof , with alcohol acrylate esters of CM, and their mixtures being more preferred. The long chain alcohol acrylate ester monomers are selected from alkyl acrylate esters being most preferred with C1 alkyl acrylate esters (W0) The entanglement agent in both the first and second types of acid polymers Preferred carboxylic acid is a polyalkenyl polyether of a polyhydric alcohol containing more than one alkenyl ether group per molecule, in which the main polyhydric alcohol contains at least 3 carbon atoms and at least 3 hydroxyl groups The preferred crosslinkers are those selected of the group consisting of allyl ethers of sucrose and allyl ethers of pentaerythritol, and mixtures thereof The carboxylic acid polymers useful in the present invention are more fully described in U.S. patent 5,087,445, Haffey et al., issued on February 11, 1992, U.S. Patent 4,509,949, Huang et al., issued April 5 1985; Brown's United States Patent 2,798,053 issued July 2, 1957; which are incorporated by reference herein in their entirety. See also. CTFA International Cosmetic Ingredient Dicitionary. fourth edition, 1991, pages 12 and 80; which is also incorporated herein by reference in its entirety. Examples of commercially available carboxylic acid polymers of the first type useful herein include carbomers, which are homopolymers of acrylic acid crosslinked with allyl ethers of sucrose or pentaerythritol. The carbomeros are available like the series Carbopol® of B .F. Goodrich Company of Cleveland, OH. Examples of commercially available carboxylic acid copolymers of the second type useful herein include copolymers of C1CK30 alkyl acrylates with one or more monomers of acrylic acid, meachacrylic acid, or one of its short chain esters (ie, C alcohol). ^), wherein the entanglement agent is an allyl ether of sucrose or pentaerythritol. These copolymers are known as C10-30 alkyl acrylate / acrylate cross-linked polymers and are commercially available as Carbopol® 1342, Pemulen® TR-1 and Pemulen® TR-2 from B.F. Goodrich. In other words, examples of polymeric carboxylic acid emulsifiers useful herein are those selected from the group consisting of carbomers, acrylates / C10-C30 alkyl acrylate cross-linked polymers and mixtures thereof. C10-C30 alkyl acrylate / acrylate crosslinked polymers are particularly preferred for use in the present invention. These emulsifiers can generally be described as hydrophilic, hydrophobically modified polymers that tend to both emulsify oils in water, and stabilize the final emulsion. These are predominantly polymers based on polyacrylic acid of high molecular weight having a small lipophilic portion and a large hydrophilic portion. These cross-linked polymers tend to provide improved oil-in-water emulsions relative to other known polymeric emulsifiers., and may offer the additional advantage of obviating the need for a regulator. Pemulen® emulsifiers are highly preferred in the compositions of the present invention. Pemulen® emulsifiers have a relatively high level of hydrophobicity and thus tend to form emulsions wherein the drops of silicone oil are highly stabilized against coalescence and skimming. In addition, Pemulen® emulsifiers, and particularly Pemulen® TR-2, tend to allow low viscosities. A relatively low viscosity for personal cleansing cleaning products of the present invention is preferred to ensure sufficient impregnation of the cleansing product, for cleaning efficiency, and to provide a positive tactile impression. At the same time, the compositions containing the Pemulen® emulsifiers tend to remain substantially evenly distributed in the cleansing product, ie, the settling of the composition does not occur to a significant degree. Pemulen® emulsifiers and their uses in personal calculated compositions are described in greater detail in the technical brochure "Introducing the New, Universal Emulen® Polymeric Emulsifiers," B.F. Goodrich Company, April 1994 and in "Emulen® Polymeric Emulsifiers: What They Are, How They Work" R. Dodwell, R. Lockead, W. Hemmeker, both incorporated herein by reference. Additional emulsifiers which are useful herein are described in the aforementioned U.S. Patent 5,043,155 issued to Puchaisky et al., Which is hereby incorporated by reference in its entirety. In preferred embodiments, the composition also contains one or more components selected from water soluble polyols, pH adjusting agents, antimicrobial agents and chelating agents. The water soluble polyols (which include miscible in water) are polyols which are capable of dissolving or dispersing uniformly in the water. The water soluble polyol can serve several purposes in the composition. For example, the polyol can function as a skin moisturizer, humectant or emollient. The polyol may additionally or alternatively potentiate the antibacteriological agent. The polyol can be used as a solvent for one or more components of the composition. Water soluble polyols which are suitable for use herein include water soluble alkylene polyols and analogues of said water soluble polyols. Water-soluble analogues of these polyols include esters of water-soluble alkylene polyols. Non-limiting examples of water soluble polyols suitable for use herein include ethylene glycol, polypropylene glycol, butylene glycol, diethylene glycols, triethylene glycols, other water soluble polyethylene glycols, water soluble polypropylene glycols, glycol expel, glycerol, polyoxyethylene sorbitol. , 1,2,4-butane triol, 1,2,6-exatriol, sorbitol, and mixtures thereof. Propylene glycol is an economically preferred polyol. Butylene glycol and exylene glycol, and particularly exylene glycol, tend to enhance the antimicrobial agent and are therefore preferred to provide a higher level of protection against the growth of micro-organisms. Therefore, these glycols, and particularly the glycol exile, are preferred to provide greater storage stability to the composition and to the cleaning products containing the composition. These glycols can be particularly preferred where the cleaning products are formed from a porous substrate, for example, a non-woven web. The water-soluble polyol is employed in an amount effective to provide the desired function or functions, for example, as a skin moisturizer, humectant and / or emollient, as a solvent for other components of the composition, or to enhance the agent antibacterial (here referred to alternately as "an effective amount"). Typically, the water soluble polyol will be used in an amount of from about 0.5 to about 3%, preferably from about 0.5 to about 2%, more preferably from about 0.5 to about 1%, based on the weight of the composition. Mixtures of said agents can be used. It is generally desired in the personal cleansing or treatment compositions to adjust the pH of the composition to that or close to that of the skin. Therefore, the pH will typically be adjusted as may be necessary to provide a composition with a pH of about 4 to 7, more preferably 4.5 to 6.5, the pH can be adjusted by adding one or more pH adjusting agents in an amount effective for providing such pH values (herein alternatively referred to as "an effective amount.) The agents that can be used to adjust the pH of the composition herein include organic and inorganic acids and bases. Preferred of the present invention, which employ a polymeric carboxylic acid emulsifier, the composition in the absence of a pH adjusting agent tends to be more acidic than desired.Therefore, a basic pH adjusting agent will typically be used to give to the composition the desired pH.The basic pH adjusting agents include organic amine bases, preferably amines which are relatively non-toxic. irritants and having a relatively low equivalent weight, for example, thymethanol amine, trimethyl amine, tromethamine, amino methyl propanol and tetrahydroxy ethylene diamine. Versions of higher grade (ie, at least 99% purity) of organic amine bases are preferred. Inorganic bases including alkali metal salts such as NaOH, may also be used. Organic amines will typically be preferred since they have a lower risk of irritation, and their titration is more easily controlled, in relation to inorganic bases. Other pH adjusting agents are described in U.S. Patent 5,043,155 previously referred to. The amount of the pH adjusting agent that is employed depends on the equivalent weight of the pH adjusting agent and the desired pH. Typically, the pH adjusting agent is used in an amount of from about 0.01 to about 0.5% by weight of the composition. Preferred compositions of the present invention include from about 0.05 to about 0.2% by weight, typically from about 0.1 to about 0.2% by weight of the pH adjusting agent. The antimicrobial agents can function in one or more ways to improve the shelf life of the composition and products that the composition incorporates. For example, the antimicrobial may be a preservative, an antibacterial agent, an antifungal agent or a combination thereof. The antimicrobial agent is used as may be required in an amount that is effective to provide adequate shelf life (storage stability, i.e., the microorganisms do not grow to a significant degree) (here referred to alternately, "an effective amount"). "). Useful components will typically have a shelf life of at least one year under storage conditions of approximately 75 ° F and 50% relative humidity (measured in accordance with the United States Pharmacopoeia Test entitled "Microbial Test, Antimicrobial Preservative - Effectiveness "). The antimicrobial agent is typically used in an amount of from 0.05% to about 0.05% based on the weight of the composition. Preferred compositions of the present invention employ from about 0.1 to about 0.3% by weight of the antimicrobial agent. One or more antimicrobial agents may be employed. The antimicrobial agent is preferably substantially soluble in water and insoluble in the silicone oil. Antimicrobial agents that are suitable for use in the present, include, but are limited to those described in the aforementioned and incorporated U.S. patent 5,043,155 issued to Puchalki et al. and U.S. patent 4,844,891 issued to Rosen et al. on July 4, 1989, incorporated herein. by reference. A preferred antimicrobial agent is available from Lonza, Inc. of Fairlawn, NJ, under the trade name Glydant Plus®. Glydant Plus® comprises a mixture of 1,3-bis (hydroxymethyl) -5,5-dimethylhydantoin (ie, DMDMH) and 3-iodo-2-pyrinyl butyl carbamate (the moiety may also comprise a minor amount of hydroxymethyl-5-hydroxymethyl). , 5-dimethylhydantoin (ie DMH)). It has been found that Glydant Plus® is highly effective in preventing the growth of a wide variety of microbes, and is advantageously effective against the growth of the fungus. This tends to be particularly important where the cleaning product contains a porous substrate, for example, nonwoven substrates. Glydant Plus® tends to provide cleaning products that have exceptional storage stability under a variety of storage conditions, including storage at or below freezing temperatures. Alternatively, preferred antimicrobial agents are described in the aforementioned and incorporated United States Patent 4,844,891. The composition preferably contains one or more chelating agents. The chelating agent tends to bind metals (eg, calcium ions, magnesium ions) that may be present in the composition to increase the efficiency of the emulsifier and the antimicrobial agent. In this way, the chelating agent can be considered to provide a level of antimicrobial activity to function, for example, as a preservative. The chelating agent can be used in an amount that is effective to bind the aforementioned metals (hereinafter referred to alternately as an "effective amount"), typically an amount ranging from about 0.01% to about 0.2% by weight of the composition. Particularly preferred compositions include from about 0.05% to about 0.02%, more preferably from about 0.05% to about 0.15% chelating agent, based on the weight of the composition. Chelating agents and their uses in their personal cleansing compositions are well known in the art. Exemplary chelating agents are described in the above-referenced U.S. patent 5,043,155 and include EDTA disodium EDTA trisodium, and tetrasodium EDTA. The composition may optionally include other ingredients, for example, fragrance; skin cedating aids such as panthenol, bisabolol, alcacer tea extract, cola extract, ictamol, stearyl glycyrrheate, ammonium glycyrtenate, vitamin E (tocopherol acetate or tocopherol), and a a; moisturizing or emollient skin moisturizers different from those described above; powders and the like. The compositions of the present invention will contain from about 84% to 99.5% by weight in water and about 0. 5 to about 10% by weight of silicone oil. Preferred compositions contain from about 91 to about 99.5% weight of water and about 0.5 to less than 3% by weight of silicone oil more preferably about 0.5 to about 2.5% by weight of silicone oil; most preferably from about 1 to about 2.5% by weight of silicone oil. Said compositions will contain an effective amount of emulsifier as described above. The compositions may also contain one or more agents selected from antimicrobial agents, water soluble polyols, pH adjusting agents, and chelating agents as previously described. These agents can be used in an effective amount as described above. In this manner, the compositions of the present invention may contain from about 84 to about 99.5% by weight of water, from about 0.5 to about 10% by weight of silicone oil, and from about 0.05 to about 1% by weight. of emulsifier. the composition preferably contains from about 91 to about 99.5% by weight of water of from about 0.05 to about 1% by weight of emulsifier, and from about 0.5 to less than 3% by weight of silicon oil, more preferably from about 0.5 to about 2.5% by weight of silicone oil, most preferably from about 1 to about 2.5% by weight of silicone oil. Particularly preferred compositions will contain an antimicrobial agent, a water soluble polyol, a pH adjusting agent, a chelating agent in the amounts previously described. Preferred compositions of this type contain from about 91 to 99% by weight of water, from about 0.5 to less than 3% by weight of silicone oil, from about 0.05 to about 1% by weight of emulsifier, from about 0.05 to about 0.5% by weight of antimicrobial agent, from about 0.5 to about 3% by weight of water soluble polyol, from about 0.01 to about 0.5% of pH adjusting agent, and from about 0.01 to about 0.2% by weight of the chelating agent . Compositions of this type more preferably contain from about 0.5 to about 2.5, most preferably from about 1 to about 2.5%, by weight of silicone, the amounts of the other non-aqueous ingredients and the water, are within the scales established in this paragraph and that balance the composition to 100% by weight. The water content of these latter compositions may vary from about 92 to about 99%, and, respectively, from about 92 to about 98.5%. Preferred exemplary compositions of the present invention in this manner include: (A) from about 92 to about-99% by weight of water, from about 0.5 to less than 3% by weight of silicone oil, from about 0.1. about 0.5% by weight of the emulsifier, from about 0.05 to about 0.5% by weight of the antimicrobial agent, from about 0.5 to about 3% by weight of water soluble polyol, from about 0.01 to about 0.5% of the adjusting agent of pH, and from about 0.01 to about 0.2% by weight of chelating agent; (B) from about 94.5 to about 99% by weight of water, from about 0.5 to about 2.5% by weight of silicon oil, from about 0.1 to about 0.3% by weight of emulsifier, from about 0.1 to about 0.3% by weight of antimicrobial agent, from about 0.5 to about 2% by weight of the water soluble polyol of from about 0.05 to about 0.2 of pH adjusting agent, and from about 0.05 to about 0.2% by weight of chelating agent; and (C) from about 95 to about 98.5% by weight of water, from about 1 to 2.5% by weight of silicone oil, from about 0.1 to about 0.2% of emulsifier, from about 0.1 to about 0.3% by weight of agent antimicrobial, from about 0.5 to about 1% by weight of polyols soluble in water, from about 0.1 to about 0.2% of pH adjusting agent and from about 0.05 to about 0.15% by weight of chelating agent. In the above compositions, the emulsifier is preferably a polymeric emulsifier, more preferably a polymeric carboxylic acid emulsifier, most preferably a C10-C30 alkyl acrylate / acrylate polymeric cross emulsifier. A particularly preferred emulsifier is Pemulen®. The preferred silicone is dimethicone, most preferably dimethicone having a viscosity of from 50 to 1000 centisokes, most preferably a viscosity of 350 centistokes. A preferred antimicrobial agent comprises a mixture of 1,3-bis (hydroxymethyl) -5,5-dimethylhydantoin and 3-iodo-2-propynyl butyl carbamate as previously described. The compositions can be prepared by oil-in-water emulsion techniques as they are known or come to be known in the art. In general, the process includes the steps of preparing a mixture of the ingredients of the composition and subjecting the mixture to conditions to make the formation of a water-in-oil emulsion homogeneous and stable (a suspension of the silicone oil is formed in the water and water-soluble materials). The homogeneity is indicated by a composition that is substantially smooth in appearance, free of lumps and uniform. A stable emulsion remains homogeneous for a given period that is determined by the required shelf life of the composition. The mixture can be formed in a lid by the addition and mixing of each of the ingredients. Alternatively, less than all the ingredients may be combined for subsequent combination with other ingredients or other pre-blended ingredients to form the mixture. For example, the antimicrobial agent may be premixed by a portion of the water, water soluble polyol or mixture thereof in a preferred embodiment, at least a portion of water, the emulsifier, the silicone oil, and the water soluble polyol. optionally, the antimicrobial agent and the chelating agent are first combined and subjected to conditions to form the emulsion. The pH adjusting agent is then added and mixed in the emulsion. Where the resulting emulsion has been prepared with less than the water level finally desired, the emulsion can be subsequently diluted to form the composition of the invention. When this process is employed, the composition tends to be particularly homogeneous, said compositions tend to be more evenly distributed and / or absorbed by a substrate that is used in the cleaning products described herein. In addition, the silicone oil film that is subsequently formed on the skin tends to be more uniform thereby providing a more effective protective barrier layer. In addition, this method tends to reduce the energy needed to manufacture the composition. The mixture may contain each of the ingredients in the total amounts intended. Alternately, the mixture may contain less than the total of each of the ingredients, typically less than the total amount of water, such that a concentrated emulsion is formed. The concentrate will typically be designed to provide both a volume that is preferred for storage and / or shipping, and a workable viscosity. For example, a concentrate can be formed 5 times. The concentrated emulsion can then be diluted by adding the rest of the ingredients to form the composition of the present invention. A suitable method for forming a concentrated emulsion is described in the aforementioned United States patent. ,043,155. Although the use of a technique for the concentrated emulsion may be economically preferred, it has been found that such a technique is not required to obtain the compositions of the present invention. Suitable equipment for forming the mixtures and emulsions can be selected from those known in the art, or which become known in the art. For example, a suitable apparatus includes twin-fin mixers of elice. It is also possible to use a turbine mixer and an in-line homogenizer which uses rotor stators in tandén, as described in United States Patent 5,043,155, referred to above. A single-shaft motor equipped with two elice fins has been found to be suitable for preparing the compositions of the present invention. In a preferred configuration, the shaft extends substantially through the depth of the mixing container and has a first ellix which is positioned as close to the bottom of the container as possible, and a second axis placed within approximately the lower half, preferably to the lower room, of the container, and more preferably within about 1 foot of the first elliptical. The first elice preferably has a diameter close to that container diameter, more preferably as close to that of the container as possible while the second helix may be the same size or substantially smaller. The mixer is suitably set to drive a free shaft at a speed of from 1,000 fm to about 15,000 fm. Preferably, the motor is set to drive a free shaft at a speed of from about 1000 to at least about 6000 rpm. To form the emulsion, the mixture is typically mixed over a period of about 5 to 60 minutes, with an engine speed set to drive a free shaft at a rate of from about 1,000 fm to about 15,000 rpm, preferably from about 1,000 to about 6000 rpm. In a particularly preferred embodiment, the mixture is mixed for a period of about 5 to 30 minutes, with the engine speed set to drive a free shaft at a speed of about 1000 rpm to about 3000 rpm. As will be understood by knowledgeable craftsmen, care must be taken to avoid subjecting the mixture to excessive shear stress, which can interfere with emulsification. The resulting emulsification containing the ingredients in their total amounts has a preferred viscosity at room temperature (ie 20 ° -25 ° C) on the scale of about 10 to about 200 centipoise (i.e., cps), more preferably about 15 at about 150 cps, more preferably from about 20 to about 100 cps. The viscosity can be determined using a Brookfield RVT viscometer equipped with a number 1 screw at a speed of 20 rpm according to the procedures readily available and commonly used by the Brookfield viscometer or an equivalent apparatus and method. The emulsion tends to remain stable for a period in excess of one year at room temperature or one month at 45 ° C. Instability is indicated by a significant variation, typically a significant decrease in viscosity. Instability is also indicated by the appearance of the layers in the depth of the composition when viewed from a horizontal perspective in a container transparent to the naked eye. The compositions of the present invention are particularly useful for personal cleansing and / or application in the treatment of the skin, the compositions can be applied directly to the skin, for example, spraying, trickling, straightening, rubbing, massage and the like. Additionally or alternatively, the compositions can be applied with the use of a suitable applicator comprising a substrate material for handling the composition.

Non-limiting examples of substrate materials are sponges, foams, nonwoven webs, films and the like. In this way, the compositions of the present invention are particularly suitable for use in combination with a substrate for personal cleansing, skin treatment, or other personal care uses. In a preferred embodiment, the composition is pre-combined with a substrate to form a cleaning product, for example, disposable cleaning products, which are used for said purpose subsequently. As used herein, "cleaning product" means a substrate and composition of the present invention that are pre-assembled for later use. Disposable cleaning products are those that are intended to be discarded after a single use (ie, the original cleaning product in its entirety is not intended to be washed or otherwise be restored or reused as a cleaning product, although certain materials or all of the cleaning products can be recycled, reused or composted). The cleansing compositions and products are well suited for use in cleaning and / or treating the perineal area of infants and other incontinent individuals (e.g., to be used as a baby towel or towel for incontinent adults). However, this should be understood that the compositions and cleaning products of the present invention are useful in other applications, including but not limited to cleaning and / or treatment of the face and hands. Suitable cleaning substrates include nonwoven webs, films, foams, sponges and the like. Preferred cleaning substrates comprise a porous material that is capable of maintaining the composition within the pores of the substrate. Therefore, preferred substrates include nonwoven webs, foams, sponges and the like. For incontinent baby and adult cleansing products the substrates will preferably be a nonwoven web. The nonwoven substrates used for the cleansing product can be formed from cellulosic fibrous materials, synthetic polymeric fibrous materials or a combination thereof (eg coform). For example, the non-woven web may contain from about 1% to 99% by weight of cellulosic fiber and, respectively, from about 99% to 1% by weight of synthetic polymer fibers. Non-limiting examples of such materials include tissue paper, paper towels, and nonwoven web formed from rayon, polyolefins, polyester fibrous material or a combination of such materials with cellulosic fibers. The non-woven webs may be placed by air, wet-laid, spin-plated, blown in the molten state or carded. The non-woven webs can include one or more layers of fibrous material, for example a laminate of fibrous material. The separated layers can be formed of similar or different materials. The non-woven web can be treated, for example, to join the fibers of the non-woven web or to increase the strength of the non-woven web. Said treatment may involve hydroentangling, thermal bonding or treatment with a binder. The cellulosic non-woven webs, in particular the non-woven webs, where the fibrous material consists essentially of cellulosic products, are economically and environmentally preferred. Cellulosic nonwoven webs that are especially suitable for use in the present invention are described in U.S. Patent 3,905,863, issued to Ayers on September 16, 1975; U.S. Patent 3,974,025 issued to Yers on August 10, 1976; and the patent of the States U.S. 4,191,609 issued to Torkhan on March 4, 1980. Each of these references is hereby incorporated by reference in its entirety. Techniques for combining cleaning substrates with a cleaning or treatment composition, and for their packaging are well known in the art and are applicable to the present invention. In general, the cleaning substrate is combined with the composition by one or more techniques involving coating and dipping, spraying, extrusion and the like. In general, towels or cloths are combined with a sufficient amount of composition to provide good effective cleaning. It is often important to use a load that provides an acceptable impression to the touch (for example, sufficient but not excessive moisture not excessively oily or oily). In this manner, the cleaning substrates are typically combined with the composition in an amount of about 2 to about 8 times, preferably 3 to about 5 times the dry weight of the substrate. For example, an incontinent adult cleansing material suitable for use in cleansing the perineal area, which contains a cellulosic nonwoven web may contain the composition in an amount of about 3 times the dry weight of the nonwoven web. The following non-limiting examples are representative of the present invention. Examples (a) Preparation of a composition according to the present invention: An sion containing approximately 96.4% water, 2% silicone oil, 0.15% polymeric carboxylic acid sifier, 1% water soluble alkylene polyol is prepared , 0.1% chelating agent, 0.2% antimicrobial agent, 0.15% organic pH adjusting agent, and fragrance, as follows. A 55 gallon standard cylindrical covered drum, fixed with a single shaft having double propeller fins, driven by a motor set at 1750 rpm, is used to prepare the sion, the shaft extends substantially through the depth of the drum (approximately 4 feet) and has a first fin that is placed near the bottom of the drum and a second tree or arrow placed approximately 1 foot above the first fin). The first fin has a diameter close to that of the diameter of the drum (approximately 2 feet), and the second fin has a diameter of approximately 1 foot. The drum is loaded with 40.48 gallons of running water. The agitation of the water is started by operating the engine at its maximum speed. The agitation at this speed is continued throughout the process. 0.52 pounds of Pen® TR-2 are slowly added to allow mixing of the sifier with enough water to disperse or prevent clumping of the sification. Then the following components are added in the established order: 0.35 pounds EDTA tetrasodium; 3.49 pounds of propylene glycol; 6.97 pounds of dimethicone (Dow Corning 200 Fluid, 350cs); 0.70 pounds of Glydant Plus®; 0.01 pounds of fragrance. Each of the above ingredients are mixed individually in the water until they are well mixed in the resulting mixture, typically stirring for a period of about 1 minute between the addition of the individual ingredients, and for a period of about 5 to 10 minutes once all the ingredients have been added to the recipient. Then 0.52 pounds of triethanolamine is added and stirring is continued for a period of about 15 to 20 minutes, or until the mixture is well mixed. The pH of the composition is about 6.5. Compositions with lower or higher pH can be prepared in a similar manner by adding more or less triethanolamine, respectively. For example, a composition having a pH of 5 to 6 can be prepared by adding a lower level of triethanolamine. The resulting emulsion has a viscosity of approximately 120 cps (Brookfield LVT, screw No. 3, 30 rpm, 60 ° F measured upon stabilization of the viscometer reading after approximately 15 seconds of rotation of the screw). (b) Preparation of a disposable cleaning product containing the composition according to the invention: A cleaning material composed of a two-sheet NSK fiber cellulose substrate having a basis weight of 26 pounds per sheet , and a caliber of 20 thousandths of an inch per sheet, are laminated together under pressure with an adhesive, and are rolled in a continuous weft roller. Suitable adhesives have a wet strength that is sufficient for the sheets to remain substantially joined during use. The weft roll is cut into strips to achieve the width of the desired final wiping material (eg 11.5 inches in the unfolded configuration), and bent into Z in such a way that the edges in the machine direction overlap approximately 0.5 inches. The resulting bent and cut strips are then impregnated with the composition prepared by passing the individual webs over the top of individual distributors having holes through which the composition is pumped under pressure on the moving web). The composition is pumped to provide a load of approximately 15.5 grams of composition per finished cleaning material. Following the impregnation, the wefts are cut to the length of the desired finished cleaning material (e.g. about 8.5 inches). Although particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, it is intended to cover all of the said changes and modifications within the scope of this invention in the appended claims.

Claims (9)

1. CLAIMS 1.
2. A cleaning product comprising a substrate and an emulsion composition, the cleaning product characterized in that the composition comprises: (a) at least 90% by weight of water; (b) 0.5% or less than 3%, preferably from 0.5% to 2.5%, more preferably from 1% to 2.5%, by weight of silicone oil; and (c) an emulsifier in an amount effective to emulsify said oil in said water; said silicone oil preferably comprising a dimethicone polymer having a viscosity of from 50 to 1000 centistokes, more preferably 350 centistokes; and said emulsifier preferably being a polymeric emulsifier, more preferably a polymeric carboxylic acid emulsifier, most preferably an acrylate / alkyl acrylate cross-linked polymer; The cleaning product according to claim 1, further comprising an effective amount of an agent selected from the group consisting of: (a) anti-microbial agents, preferably comprising a mixture of 1,3-bis (hydroxymethyl) - 5,5-dimethylhydantoin and 3-iodo-2-propynyl butyl carbamate; (b) pH adjusting agents, preferably comprising an organic base amine; (c) chelating agents; (d) water-soluble polyols, preferably selected from the group consisting of water-soluble alkylene polyols, water-soluble alkylene ester polyols, and mixtures thereof; more preferably comprising an alkylene glycol of C3-C8; and (e) mixtures thereof.
3. 3. A cleaning product comprising a substrate and an emulsion composition, the cleaning product characterized in that the composition comprises: (a) from 90 to 99.5% by weight, preferably from 91 to 99% by weight of water; (b) 0.5% or less than 3% by weight, preferably from 0.5% to 2.5% by weight, more preferably from 1% to 2.5% by weight of silicone oil; and (c) a polymeric carboxylic acid emulsifier comprising a crosslinking polymer of acrylates / C 10 -C 3 alkyl acrylate in an amount effective to emulsify said oil in said water, preferably from 0.05% to 1% by weight; and (d) an effective amount of an anti-microbial agent comprising a mixture of 1,3-bis (hydroxymethyl) -5,5-dimethylhydantoin and 3-iodo-2-propynyl butyl carbamate; said silicone oil preferably comprising a dimethicone polymer having a viscosity of 50 to 1000 centistokes.
4. 4. The cleansing product according to claim 3, wherein said composition additionally comprises an effective amount of an agent selected from the group consisting of basic pH adjusting agents, chelating agents, and mixtures thereof. The cleaning product according to claim 3 or 4, wherein said composition additionally comprises an effective amount of a water-soluble polyol, preferably selected from the group consisting of alkylene-water-soluble polyols, alkylene-soluble polyols esters in water, and mixtures thereof; said composition preferably comprising 0.5 to 3% by weight of said water soluble polyol; from 0.05 to 0.5% by weight of said antimicrobial agent; from 0.01 to 0.2% by weight of said chelating agent, and from 0.01 to 0.
5. 5% by weight of said basic pH adjusting agent.
6. 6. The cleaning product according to any of claims 1 to 5, wherein the substrate is a nonwoven web, preferably comprising cellulosic fibers.
7. The cleaning product according to any of claims 1 to 6, wherein the product comprises said composition in an amount of from 2 to 8 times the dry weight of said substrate.
8. 8. An emulsion composition useful for cleaning or treating the skin of a person, characterized in that the composition comprises: (a) at least 90 by weight, preferably 91 to 99% by weight of water; (b) 0.5% or less than 3% by weight of silicone oil; and (c) a polymeric carboxylic acid emulsifier comprising a crosslinking polymer of acrylates / C10-C30 alkyl acrylate in an amount effective to emulsify said oil in said water, preferably from 0.05% to 1% by weight; and (d) an effective amount, preferably 0.05 to 0.5% by weight, of an anti-microbial agent comprising a mixture of 1,3-bis (hydroxymethyl) -5,5-dimethylhydantoin and 3-iodo carbamate. 2- propinyl butyl.
9. 9. The emulsion composition according to claim 8, further comprising; (e) an effective amount, preferably from 0.5 to 3% by weight of a water-soluble polyol selected from the group consisting of water-soluble alkylene polyols, water-soluble alkylene ester polyols, and mixtures thereof; (f) an effective amount, preferably 0.01 to 0.2% by weight of a chelating agent; and (b) an effective amount, preferably 0.01 to 0.5% by weight of a basic pH adjusting agent.