Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2000-05-17
2001-03-06
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S067000, C424S068000, C424S400000, C424S401000
Reexamination Certificate
active
06197286
ABSTRACT:
TECHNICAL FIELD
The present invention relates to cosmetic stick compositions that are formulated to contain triglyceride gellants in a stabilized crystalline phase characterized by a beta prime-2 (&bgr;′-2) crystalline order.
BACKGROUND OF THE INVENTION
There are many types of solid cosmetic sticks that are commercially available or otherwise known in the various arts. These cosmetic sticks include products such as moisturizers, perfumes or fragrances, skin conditioners, antiperspirants, anti-wrinkle products, pharmaceuticals, deodorants, make-up and foundations, sunscreens, and many other products intended for topical application to the skin. Many of these products contain a cosmetic active dispersed within a suitable liquid carrier and contained within a solid gellant or wax matrix that provides the product with sufficient hardness to form a solid stick composition. In addition to providing sufficient product hardness, the solid gellant or wax matrix also acts to contain the liquid carrier and any other liquid ingredients sufficiently to prevent syneresis of such liquids from the product form prior to application.
Wax gellants such as stearyl alcohol and other fatty alcohols are especially common in many commercially available cosmetic stick products. These waxes typically provide a solid matrix within which the cosmetic active and a liquid carrier can be contained with minimal or no liquid syneresis during storage. Other gellants such as the triglyceride gellants have also been used in solid cosmetic sticks, due in large part to the lower raw material cost associated with the use of natural triglycerides.
It has now been found, however, that cosmetic sticks that contain triglyceride gellants can develop stability problems after exposure to high and then low storage temperatures, which can then result in an undesirable softening of and excessive liquid syneresis from the cosmetic stick matrix. It has also been found that triglyceride-based cosmetic stick compositions can be formulated into a more temperature-stable stick form. These compositions are formulated so that exposure to high and then low storage temperatures does not result in excessive softening of the product form and also does not result in excessive development of solvent syneresis during exposure to such temperature changes. It has been found that this can be accomplished by formulating the composition with solid polymorphic triglycerides characterized by beta prime-2 (&bgr;′-2) crystalline order within the finished product form. It has been found that by formulating these triglyceride gellants in this manner, that product stability is improved such that product hardness is better maintained and liquid syneresis minimized, especially when exposed to higher and then lower storage temperatures.
It is therefore an object of the present invention to provide a solid cosmetic stick composition that contains a triglyceride gellant and is texture and phase stable when exposed to high and then lower storage temperatures. It is a further object of the present invention to formulate such a composition containing a thermodynamically stable triglyceride gellant, one that is characterized by &bgr;′-2 crystalline order within the finished product form.
SUMMARY OF THE INVENTION
The present invention is directed to anhydrous cosmetic stick compositions comprising from about 0.01% to about 60% by weight of a cosmetic active; from about 10% to about 90% by weight of a liquid carrier; and from about 1% to about 60% by weight of a solid, polymorphic, unsubstituted, triglyceride gellant, wherein the triglyceride gellant within the composition is characterized by a &bgr;′-2 crystalline order.
It has been found that the cosmetic compositions of the present invention can be formulated for improved texture and phase stability, wherein the product hardness of the compositions is maintained after exposure to high and then low storage temperatures. The improved stability is made possible within the compositions by formulating the triglyceride gellant into a stable crystalline phase that is characterized by &bgr;′-2 crystalline order within the finished product form. It has been found that cosmetic stick compositions containing triglyceride gellants tend to soften when exposed to high and then low storage temperatures, and that this can be minimized or avoided by formulating the triglyceride gellant into its &bgr;′-2 crystalline order within the finished product form.
DETAILED DESCRIPTION OF THE INVENTION
The cosmetic stick compositions of the present invention comprise as essential ingredients cosmetic active, a liquid carrier, and a defined crystalline form of a polymorphic triglyceride gellant. Each is described in detail hereinafter.
The term “cosmetic stick” as used herein refers generally to any stick composition suitable for topical application to the skin.
The term “anhydrous” as used herein refers to those materials or compositions that contain less than about 5%, more preferably less than about 3%, even more preferably less than about 1%, most preferably zero percent, by weight of free or added water, e.g. water other than the water of hydration typically associated with some solid materials such as particulate antiperspirant active.
The term “solid” as used herein, unless otherwise specified, refers to those materials that are solid at or above 37° C. (skin temperature as measured in the axilla area). The term “liquid” as used herein, unless otherwise specified, refers to those materials that are liquid at or below 37° C. As used herein, a material is determined to be a solid or a liquid at 37° C. by evaluating that material in a finished cosmetic stick composition using Differential Scanning Calorimetry (DSC). For example, A Perkin Elmer Model DSC-7, manufactured by Perkin Elmer Corporation, 761 Main Street, Norwalk Conn., can be used to measure a melting profile of the desired material. This is done by preparing a 20 mg sample in a volatile sample pan arrangement of the desired finished product to be tested. A heating curve (DSC curve) is generated at 5° C. per minute and is analyzed by measuring the partial area that melts below 37° C., and those showing at least 10% of the DSC curve below 37° C. are “liquids” and those showing less than 10% of the DSC curve below 37° C. are “solids.”
The term “skin temperature” as used herein refers to the temperature of the axilla or other area of the skin, which is generally at or slightly below a typical body temperature of about 37° C.
The term “ambient conditions” as used herein refers to surrounding conditions under about one (1) atmosphere of pressure, at about 50% relative humidity, and at about 25° C., unless otherwise specified. All values, amounts and measurements described herein are obtained under ambient conditions unless otherwise specified.
The term “volatile” as used herein refers to those materials which have a measurable vapor pressure at 25° C. Such vapor pressures will typically range from about 0.01 mmHg to about 6 mmHg, more typically from about 0.02 mmHg to about 1.5 mmHg, and have an average boiling point at one (1) atmosphere of pressure (atm) of less than about 250° C., more typically less than about 235° C. at one (1) atm. Conversely, the term “non volatile” refers to those materials which are not “volatile” as defined herein.
The cosmetic stick compositions of the present invention can comprise, consist of, or consist essentially of the essential elements and limitations of the invention described herein, as well as any additional or optional ingredients, components, or limitations known or otherwise effective for use in the such compositions.
All percentages, parts and ratios are by weight of the total composition, unless otherwise specified. All such weights as they pertain to listed ingredients are based on the specific ingredient level and, therefore, do not include solvents, carriers, by-products, filler or other minor ingredients that may be included in commercially available materials, unless otherwise specified.
Produc
Landgrebe James David
Scavone Timothy Alan
Dodson Shelley A.
Elandjian Lucy
The Procter & Gamble & Company
Winter William J.
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