MX2008007109A - Soap composition with encapsulates - Google Patents

Abstract

A personal care composition comprising a product base with at least one encapsulate dispersed throughout is disclosed. The at least one encapsulate contains a hydrophobic internal phase comprising a density-modifying agent such that the specific gravity of the solution is adjusted to provide for suspension and distribution of the at least one encapsulate throughout the product base.

Description

COMPOSITION OF SOAP WITH ENCAPSULATED CROSS REFERENCE TO RELATED REQUESTS This application claims the priority of the United States provisional patent application serial number 60 / 752,345, filed on December 21, 2005, the contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION Liquid personal care compositions, including soaps and body cleansers, containing encapsulates, or suspended microparticles, are known in the art. These compositions containing suspended or encapsulated microparticles typically have a gel type rheology and are suspended in solution by a gelling agent or other suspending agent. These agents are used to provide a uniform distribution of the suspended or encapsulated microparticles within the product base. In addition to the suspension or gelling agent, adjustments can also be made in the viscosity of the liquid formulation to establish a uniform distribution. In non-liquid products, which are Substantially solid at room temperature and liquids at higher temperatures, the product must remain molten and diluted to process and fill the product molds or castings, so the addition of a gelling agent to suspend the microparticles or encapsulates or the viscosity adjustment. When the microparticles or encapsulates are added to a molten product that does not contain a suspending or gelling agent, the microparticles will be added in the upper part or in the lower part of the solution, depending on the specific gravity.

Therefore, there is a need for a personal care composition comprising a microparticle or encapsulation that can be used in a molten product formulation wherein the specific gravity is such that the microparticle or encapsulation remains suspended in the product base and is distributed evenly throughout the formulation.

SYNTHESIS OF THE INVENTION The present invention is a solid soap composition comprising a soap product base and encapsulates which are suspended in the product base of soap, where the encapsulates have basically the same density as that of the soap product base. In one embodiment, the encapsulates contain a pigment, for example, a pigment derived from ore, which increases the density of the encapsulation. By adjusting the density ratio of the encapsulation to match the density of the soap product base, the encapsulates can be distributed throughout the product base.

The invention therefore provides, in one embodiment, a soap bar of Formula I comprising: (i) a soap product base; Y (ii) at least one encapsulation comprising an internal phase with a density modifying agent in a hydrophobic phase, the internal phase being surrounded by an external phase; wherein (i) the ratio of the density of at least one encapsulation and the density of the soap base is from 97: 100 to 103: 100, preferably 99: 100 and 101: 100; and (ii) the at least one encapsulate is distributed in the soap product base.

The soap product base is preferably a clear or translucent composition. For example, in addition to soap (eg, potassium and / or sodium salts of long and medium chain fatty acids, eg, stearic acid, myristic acid and / or coconut acid), it may comprise: additional surfactants (e.g. , anionic, cationic, nonionic or sutionionic surfactants, for example, sulfate and / or sulfonate surfactants, for example, sodium lauryl sulfate, sodium laureth sulfate, lauryl disodium sulfosuccinate, as well as cocamidopropyl betaine), as well as water and humectants, example, polyhydric alcohols (for example, glycerol, propylene glycol, dipropylene glycol, sugar alcohols and sugars). See, for example, U.S. Patent 6,838,420 incorporated herein by reference.

The encapsulates have an average diameter of, for example, about 100 to about 2000 microns, for example about 600 and about 1000 microns. In one embodiment, the external phase of the encapsulation is gelatin gum, for example, a mixture of fish gelatin and Arabian gum, and the internal phase comprises a semi-solid oil, preferably a substance that provides a benefit to the skin, for example, kapté butter, cocoa butter or petrolatum. The semi-solid oil can be mixed with the pigment (for example, titanium dioxide where white is desired, ferric oxide where ro is preferred, ultramarine base for blue, etc.) before encapsulation to achieve the desired density. The encapsulation may optionally comprise other materials, for example, fragrances, vitamins, etc., provided that the final mixture is such that the density of the encapsulation is equal to that of the base during the manufacturing process.

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a soap composition comprising a soap product base and dispersed encapsulates within the product base. Adjustments are made in the specific gravity of the composition so that the encapsulates are dispersed throughout the product base.

The compositions as provided herein are described and claimed with reference to their ingredients, as is usual in the art. As will be evident to one with skill in the art, the ingredients may sometimes react with one another, so that the authentic composition of the final formulation may not correspond exactly with the ingredients listed. Therefore, it should be understood that the invention extends to the product of the combination of the listed ingredients.

All the ingredients for use herein are preferably cosmetically acceptable. By "cosmetically acceptable" is meant suitable for use in a topical application formulation on human skin. A cosmetically acceptable excipient, for example, is an excipient that is suitable for external application in the amounts and concentrations provided in the formulations of this invention, and includes for example excipients that are "Generally Recognized as Safe" (GRAS) by Drug Administration. and Food from the United States. Preferably, heavy metals, radioactive elements and other materials that one skilled in the art would consider reasonably toxic for topical administration in the amounts envisaged are excluded.

The soap composition of the present invention comprises a product base and one or more encapsulates in the product base. The soap product base is a soap-based composition containing soap, surfactants and water, and may include additional elements such as a humectant, an alcohol or desired aesthetic additives such as a fragrance or a humectant.

The encapsulates of the present invention have an internal hydrophobic phase. The internal phase contains a density modifying agent and a carrier agent to provide ease of distribution of the density modifying agent. Suitable density modifying agents include metal oxides and other pigments made from mineral powders, since they are relatively heavy. Titanium dioxide is a pigment used in the preferred embodiment as a density modifying agent. Other density modifying agents can be used in the composition, if such agents impart the desired density of the encapsulate and the specific gravity of the composition. By varying the amount of the density modifying agent in the encapsulation, the specific gravity is adjusted so that the encapsulation can be evenly distributed across the product base.

The product base of the present invention preferably comprises a soap, surfactant, structuring agent and water.

In one embodiment, the soap product base comprises salts of fatty acids selected from stearic acid, myristic acid and coconut acid. Examples of additional surfactants that may be present in the soap composition include anionic, amphoteric, nonionic and cationic surfactants. The amount of soap is about 3% to about 40% by weight, or about 10% to about 30%. The additional surfactant is present in the soap composition in an amount by weight of about 4% to about 40%.

A structurant can be used in the product base as a substance to make the soap composition harder. Structures such as alkali metal halides and alkali metal sulfates, including sodium chloride and sodium sulfate, are preferred. Structuring levels can be from 0% to around 5% by weight, or from around 0.5% to around 1.5%.

Optionally, a gelling agent can be used in the product base to increase the hardness of the bar.

A humectant can be added to the product base to aid in the solubilization of the soap. Such humectants include polyhydric alcohols such as propylene glycol, dipropylene glycol, glycepine, sorbitol, mannitol, xylitol and hexylene glycol.

Optional ingredients that may be present in the product base include fragrances, dyes, chelating agents such as EDTA, antimicrobial agents, humectants and preservatives.

The bars can be prepared by standard procedures. The bars are prepared by means of pressing (molding) or pouring (pouring) methods, for example, by placing a liquid in a mold.

The examples and other statements on preferred ingredients, formulations and utilities are intended to illustrate rather than limit the invention.

The percentages described in the examples below are percentages by weight based on the total formulation of the specific component of the soap composition as 100%. For example, in the example of the Product Base, the soap is present in an amount by weight of about 10 / a about 30% of the composition of the Product Base, not of the total composition of the product. j fertilizer Therefore, the invention provides in a particular embodiment, a bar of soap according to Formula 1 above, as follows: Soap Product Base comprising Internal phase comprising External phase comprising Composition of the soap bar fifteen twenty Examples of representative formulations are as follows

Claims (15)

1. A bar of soap that includes: (a) a soap product base; and (b) at least one encapsulation comprising an internal phase having a density modifying agent in a hydrophobic phase, the inner phase being surrounded by an external phase; wherein (i) the ratio of the density of the at least one encapsulation to the density of the soap base is from 97: 100 to 103: 100 and (ii) the at least one encapsulation is distributed on the basis of soap product.

2. The soap bar as claimed in clause 1, characterized in that at least one encapsulation independently has an average diameter of about 100 to about 2000 microns.

3. The bar of soap as claimed in clause 1, characterized because the external phase of the at least one encapsulation comprises gelatin and the internal phase contains a semi-solid oil.

4. The bar of soap as claimed in clause 3, characterized in that the semi-solid oil comprises an agent selected from the group consisting of shea butter, cocoa butter and petrolatum.

5. The bar of soap as claimed in clause 1, characterized in that the at least one encapsulation comprises a density modifying agent.

6. The bar of soap as claimed in clause 1, characterized in that the density-modifying agent is a mineral-based pigment.

7. The bar of soap as claimed in clause 1, characterized in that the density modifying agent comprises 5-10% by weight of the internal phase.

8. The bar of soap as claimed in clause 1, characterized in that the soap product base is transparent or translucent.

9. The bar of soap as claimed in clause 4, characterized in that the semi-solid oil comprises shea butter.

10. The bar of soap as claimed in clause 1, characterized in that the product base of j abón comprises: a) a sodium salt of a fatty acid selected from the group consisting of stearic acid, myristic acid and coconut acid, in an amount by weight of from about 10% to about 30%; b) additional surfactants, in an amount by weight of from about 10% to about 25%; c) polyhydric alcohols, in an amount by weight of about 15% to about 30%.

11. The bar of soap as claimed in clause 10, characterized in that the polyhydric alcohols comprise one or more polyhydric alcohols selected from the group consisting of glycerin, propylene glycol, dipropylene glycol, sorbitol, mannitol, xylitol, hexylene glycol, sugars and mixtures thereof.

12. The bar of soap as claimed in clause 11, characterized in that the polyhydric alcohols are selected from one or more of the group consisting of glycerin, propylene glycol, dipropylene glycol, sorbitol, sucrose and mixtures thereof.

13. The bar of soap as claimed in clause 10, characterized in that the additional surfactants comprise one or more surfactants selected from the group consisting of sodium laureth sulfate, cocamidopropyl betaine, lauryl disodium sulfosuccinate and mixtures thereof.

14. The bar of soap as claimed in clause 10, characterized in that the soap product base further comprises a structuring component in an amount of up to about 5% by weight.

15. The bar of soap as claimed in clause 13, characterized in that the structuring component comprises sodium chloride.