Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
2002-03-04
2004-05-18
Hardee, John R. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S418000
Reexamination Certificate
active
06737394
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to detergent compositions suitable for topical application for cleansing the human body, such as the skin and hair. In particular, it relates to isotropic compositions containing benefit agent particles.
2. Background of the Art
In order to be acceptable to consumers, a liquid personal cleansing product must exhibit good cleaning properties, must exhibit good lathering characteristics, must be mild to the skin (not cause drying or irritation) and preferably should even provide a benefit agent to the skin, such as moisturizers, antiwrinkle agents, skin nutrients, and the like. Several approaches have been used to provide high levels of benefit agents in a stable formula that have involved encapsulating the benefit agent which is then ruptured or dissolved with product use. For example, U.S. Pat. No. 5,932,528 to R. Glenn, Jr., et al. issued on Aug. 3, 1999 discloses a liquid cleansing composition containing a moisturizing phase comprising an encapsulated lipophilic skin moisturizing agent and an aqueous cleansing phase comprising a surfactant and a stabilizer. The encapsulated lipophilic skin moisturizing agent comprises a lipophilic skin moisturizing agent encapsulated within a complex coascervate comprising a polycation and a polyanion.
Other particles of material including microcapsules, bubbles, beads, ground particulates, and uniform particulates have been used in various cleansing and coating applications to encapsulate or bind the contents of various agents contained therein or associated therewith. For example U.S. Pat. No. 6,270,836 to Holman issued on Aug. 7, 2001 describes microcapsules coated with a gel, specifically a gel produced by the sol-gel process. The gel coating provides certain resistances to the microcapsules, resulting in enhanced protection for their contents. Microcapsules containing different types of materials are known which may be used as ingredients in the compositions of this invention, such as gelatin.
It is known that microcapsules may be formed by a coacervation or crosslinking process, in which lipids are coated by tiny droplets of proteins, carbohydrates, or synthetic polymers suspended in water. The process of coacervation is, however, difficult to control and depends on variables such as temperature, pH, agitation of the materials, and the inherent variability introduced by a natural protein or carbohydrate.
U.S. Pat. No. 6,066,613 to L. Tsaur, et al., issued on May 23, 2000; describes large hydrogel particles suspended in an aqueous medium and a continuous extrusion/mixing process for making this kind of hydrogel particles. The hydrogel particles comprise two different high molecular weight polymers. One is insoluble in the said aqueous medium and is used for network formation and gel integrity. The other is soluble in the said aqueous medium and helps control gel swellability and gel strength. Water insoluble materials are entrapped or encapsulated inside the network formed by these two polymers and are able to be more efficiently delivered from the aqueous composition (e.g., liquid cleanser containing the hydrogel particles). However there is no disclosure or suggestion in the prior art of a isotropic cleansing composition containing organogel particles wherein the particles are formed by associating benefit agents that are liquids at about 75 C. with a gelation agent that is a solid at about 25 C. and wherein said isotropic phase composition has a viscosity of about 1,000 to about 300,000 cps at 25 C.
BRIEF DESCRIPTION OF THE INVENTION
In one aspect of the present invention is an isotropic cleansing composition containing (a) a surfactant selected from an anionic, nonionic, amphoteric and cationic surfactant and mixtures thereof; (b)a thickening agent; (c) about 0.1 to about 25% by weight of organogel particles of from about 0.05 to about 10 millimeters in diameter, the particle comprising a benefit agent that is a liquid at about 75° C. and a gelation agent that is a solid at about 25° C., the proportions of the gelation agent to benefit agent being between about 0.05% to about 70% by weight gelation agent to benefit agent, the solidification or gelation temperature of the mixture being at or above about 25° C., and (d) wherein the viscosity of the cleansing composition as measured without the organogel particles is in the range of about 1,000 to about 300,000 cps@1/sec shear rate at 25 C.
In another aspect of the invention is a method of depositing a benefit agent from an isotropic liquid cleansing composition, comprising the steps of:
(a) providing said benefit agent in said cleansing composition including: (1) a surfactant selected from anionic, nonionic, amphoteric and cationic surfactants, and mixtures thereof; (2) a thickening agent, and (3) about 0.1 to about 25% by weight of organogel particles of from about 0.05 to about 10 millimeters in diameter, the particles comprising the benefit agent that is a liquid at about 75° C. and a gelation agent that is a solid at about 25° C., the proportions of the gelation agent to benefit agent being between about 0.05% to about 70% by weight gelation agent to benefit agent, the solidification or gelation temperature of the mixture being at or above about 25° C.; and
(b) applying said cleansing composition to the skin or hair.
In another aspect of the invention is a method for preparing a composition containing (a) a surfactant selected from an anionic, nonionic, amphoteric and cationic surfactant and mixtures thereof; (b)a thickening agent; (c) about 0.1 to about 25% by weight of organogel particles of from about 0.05 to about 10 millimeters in diameter, the particle comprising a benefit agent that is a liquid at about 75° C. and a gelation agent that is a solid at about 25° C., the proportions of the gelation agent to benefit agent being between about 0.05% to about 70% by weight gelation agent to benefit agent, the solidification or gelation temperature of the mixture being at or above about 25° C., (d) wherein the viscosity of the cleansing composition as measured without the particles is in the range of about 1,000 to about 300,000 cps@1/sec shear rate at 25 C., and (e) a free emollient having a weight average particle size in the range of about 1 to about 500 microns.comprising the steps of:
(a) forming a first composition having at least one surfactant selected from anionic, nonionic, amphoteric, and cationic surfactants and mixtures thereof;
(b) adding a thickening agent to the free emollient in an amount from 1 to 50 wt. %, based on the free emollient; and
(c) mixing the base formulation of step (a) with the free emollient of step (b);
(d) adding to the first composition, the thickening agent or a blend thereof about 0.1 to about 25% by weight of organogel particles of from about 0.05 to about 10 millimeters in diameter, the particles comprising a benefit agent that is a liquid at about 75° C. and a gelation agent that is a solid at about 25° C., the proportions of the gelation agent to benefit agent being between about 0.05% to about 70% by weight gelation agent to benefit agent, the solidification or gelation temperature of the mixture being at or above about 25° C.
A free emollient is herein defined as an emollient not bound to the organogel particles. Free emollient particles are also separate and distinct from organogel particles.
Organogel particles suitable for the inventive cleansing composition comprise a hydrophobic (oleophilic) phase in particulate form, with no need for a rigid shell to encapsulate the phase, and usually with no shell present. The particle's oleophilic phase contains a gelation agent, and preferably an organogelation agent. Such particles have prolonged stability and can be simply manufactured. A preferred method of manufacture of the particles comprises forming a solution of at least the oleophilic material and gelation agent at a temperature above their gelation temperature, forming droplets of the solutions, and cooling the droplets to form particu
Shana'a May
Villa Virgilio Barba
Bornstein Alan A.
Hardee John R.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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