Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2000-05-17
2001-05-15
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
06231842
ABSTRACT:
TECHNICAL FIELD
The present invention relates to antiperspirant and deodorant stick compositions that are formulated to contain triglyceride gellants in a crystalline phase that is substantially free of long range crystalline order. The compositions have improved hardness and low residue performnance.
BACKGROUND OF THE INVENTION
There are many types of solid antiperspirant sticks that are commercially available or otherwise known in the antiperspirant art. Many of these products contain an antiperspirant 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 antiperspirant stick. 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 commercially available antiperspirant stick products. These waxes typically provide a stable solid matrix within which the antiperspirant active and a liquid carrier can be contained with minimal or no liquid syneresis during storage. Other gellants such as triglyceride gellants have also been used in solid antiperspirant sticks, due in large part to the lower raw material cost associated with the use of natural triglycerides. Many of these gellants, however, are used a relatively high concentrations to provide the antiperspirant stick with the desired product hardness, but such high gellant concentrations can also result in reduced antiperspirant efficacy and increased visible residue on the skin after application.
It has now been found that antiperspirant and deodorant sticks containing triglyceride gellants can be formulated with lower triglyceride gellant concentrations and still provide the antiperspirant and deodorant sticks with the desired product hardness. This is accomplished by formulating the stick composition with solid polymorphic triglycerides, wherein the polymorphic form of the gellant as formulated into the solid stick is substantially free of long range crystalline order. It has been found that by formulating these triglyceride gellants without long range crystalline order, that the product so formulated has improved product hardness at lower gellant concentrations. And because of the lower gellant concentrations, these antiperspirant and deodorant sticks can be applied to the skin with less visible residue and better antiperspirant efficacy.
It is therefore an object of the present invention to provide a solid, antiperspirant and deodorant stick composition that contains reduced triglyceride gellant concentrations that provide the composition with improved product hardness and low residue performance. It is a further object of the present invention to formulate such a composition with a triglyceride gellant that is substantially free of long range crystalline order of the triglyceride gellant material.
SUMMARY OF THE INVENTION
The present invention is directed to solid antiperspirant and deodorant sticks having a product hardness of at least about 600 gram·force, and which comprises from about 0.1% to about 60% by weight of antiperspirant or deodorant active; from about 10% to about 95% by weight of a liquid carrier; from about 1% to about 60% by weight of a solid polymorphic triglyceride gellant that within the composition is substantially free of long range crystalline order. The present invention is also directed to solid antiperspirant and deodorant sticks containing fully-hydrogenated, high erucic acid, rapeseed oil (HEAR Oil)
It has been found that a triglyceride-based antiperspirant and deodorant stick can be formulated at lower triglyceride concentrations provided that the triglyceride is formulated into the finished product so that it is substantially free of long range crystalline order. It has been found that these antiperspirant and deodorant sticks have improved product hardness at lower triglyceride gellant concentrations and provide improved low residue performance. These antiperspirant and deodorant sticks can also be formulated to maintain product hardness and result in little or no noticeable solvent syneresis over extended periods of time.
DETAILED DESCRIPTION OF THE INVENTION
The antiperspirant and deodorant stick compositions of the present invention comprise as essential ingredients antiperspirant or deodorant active, a liquid carrier, and a defined crystalline form of a polymorphic triglyceride gellant. Each is described in detail hereinafter.
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 antiperspirant composition using Differential Scanning Calorimetry (DSC). For example, A Perkin Elmer Model DSC-7, manufactured by Perkin Elmer Corporation, 761 Main Street, Norwalk Connecticut, 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. The heating curve is generated at 5° C./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 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 mmnHg 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 antiperspirant and deodorant 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 of 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 comrnercially available materials, unless otherwise specified.
Product Hardness
The antiperspirant and deodorant stick compositions of the present invention have product hardness of at least about 600 gram·force, most typically from about 600 gram·force about 5,000 gram·force, preferably from abo
Dodson Eric David
Landgrebe James David
Scavone Timothy Alan
Dodson Shelley A.
Elandjian Lucy
The Procter & Gamble & Company
Winter William J.
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