Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Cationic surfactant containing
Reexamination Certificate
2000-04-25
2003-11-18
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Cationic surfactant containing
C424S070100, C424S070800, C424S070110, C424S070120, C424S070130, C424S070220
Reexamination Certificate
active
06649155
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to shampoo compositions which provide a superior combination of anti-dandruff efficacy and conditioning. These compositions contain anionic surfactants, conditioning agents, anti-dandruff particulates, cationic polymers, and water. The cationic polymers have certain molecular weight and charge density parameters that provide improved efficacy of anti-dandruff shampoo compositions.
BACKGROUND OF THE INVENTION
Shampoo compositions comprising various combinations of detersive surfactants and conditioning agents, especially silicone conditioning agents, are known in the art and are commercially available. Many of these compositions have been found to provide excellent hair cleansing and conditioning performance. For example, Pantene® Shampoo Plus Pro-Vitamin Conditioner-in-One formulas which contain anionic surfactants, a cationic polymer and silicone conditioning agents provide excellent cleaning, conditioning and hair feel benefits upon application to hair.
Anti-dandruff shampoos are also well known in the art and are also commercially available. Anti-dandruff shampoos typically incorporate an anti-dandruff active and detersive surfactants. Among the preferred type of anti-dandruff agents are particulate, crystalline anti-dandruff agents, such as sulfur, selenium disulfide and heavy metal salts of pyridinethione. Soluble anti-dandruff agents, such as ketoconazole, are also known in the art.
Anti-dandruff shampoos which also provide conditioning benefits are likewise known in the art. For example, U.S. Pat. No. 5,624,666 exemplifies and claims shampoo compositions which contain anionic surfactants, cationic polymers and zinc pyridinethione as an anti-dandruff agent. U.S. Pat. No. 5,624,666 teaches that conditioning agents such as silicone fluids can optionally be incorporated into the compositions therein. Head & Shoulders® Dandruff Shampoo Plus Conditioner is an example of a marketed product which provides both anti-dandruff and conditioning benefits upon application of the shampoo to hair.
Nevertheless, some consumers desire a shampoo which provides a superior combination of anti-dandruff efficacy and conditioning performance versus currently marketed products. Such a superior combination of efficacy and conditioning can be difficult to achieve.
For example, it was previously believed that excellent anti-dandruff efficacy could be achieved by utilizing coacervate optimized for deposition efficiency on the hair and scalp. Coacervates that deposited more efficiently were thought to be preferred for efficacy. Unfortunately, the use of the most efficient coacervates to deposit anti-dandruff actives on the hair or scalp can negatively affect conditioriing, specifically clean hair feel. In order to achieve good conditioning, the level of anti-dandruff agent could be reduced, resulting in good conditioning, but less than optimal anti-dandruff efficacy.
Applicants have now discovered, however, that, surprisingly, bioavailability and coverage of the anti-dandruff active are much more predictive of efficacy than efficiency of deposition of the active on the hair or scalp. In fact, Applicants have found that, in some cases, even when an anti-dandruff active deposited very well on the hair and scalp, acceptable anti-dandruff efficacy was not achieved. Conversely, good anti-dandruff efficacy could be achieved in situations where the anti-dandruff active had good coverage and was highly bioavailable, but did not deposit superiorly to the hair or scalp. Thus, in order for a shampoo composition to provide a superior combination of anti-dandruff efficacy and conditioning compared to known shampoo compositions, it must meet certain criteria with respect to bioavailability and coverage, but it does not necessarily have to have the ability to deposit the anti-dandruff active superiorly on the hair or scalp.
Applicants have further discovered that excellent bioavailability and coverage of the anti-dandruff active from a given shampoo compositions can be achieved if the coacervate formed between the cationic polymer and the anionic surfactant upon dilution of the shampoo is spreadable and flowable, rather than elastic in nature. The nature of the coacervate is impacted by the level and types of cationic polymer present in the shampoo composition.
It is an object of the present invention to provide shampoo compositions which provide a superior combination of anti-dandruff efficacy and conditioning. It is also an object of the present invention to provide a method for cleansing and conditioning the hair. These, and other objects, will become readily apparent from the detailed description below.
SUMMARY OF THE INVENTION
The present invention relates to shampoo compositions that provide a superior combination of anti-dandruff efficacy and conditioning. These shampoos comprise: (A) from about 5% to about 50%, by weight, of an anionic surfactant; (B) from about 0.01% to about 10%, by weight, of a non-volatile conditioning agent; (C) from about 0.1% to about 4%, by weight, of an anti-dandruff particulate; (D) from about 0.02% to about 5%, by weight, of a cationic guar derivative; and (E) water. The cationic guar derivative has a molecular weight from about 50,000 to about 700,000, and has a charge density from about 0.05 meq/g to about 1.0 meq/g.
The present invention further relates to a method for providing anti-dandruff efficacy and conditioning hair comprising applying to the hair and scalp an amount of the above-described composition which is effective to provide such benefits.
DETAILED DESCRIPTION OF THE INVENTION
The shampoo compositions of the present invention provide a superior combination of anti-dandruff efficacy and conditioning. Such anti-dandruff and conditioning shampoo compositions can comprise, consist of, or consist essentially of the essential elements and limitations of the invention described herein, as well as any of the additional or optional ingredients, components or limitations described herein.
Particularly, these compositions comprise anionic surfactants, conditioning agents, anti-dandruff particulates, cationic guars, and water. Upon dilution, the anionic surfactants and cationic guars form a coacervate. The molecular weight and charge density of the cationic guar will influence the bioavailability and coverage of the anti-dandruff particulate. This is important for anti-dandruff efficacy and conditioning.
The components, including those which may optionally be added, of the shampoo compositions of the present invention, as well as methods for preparation, and methods for use, are described in detail below.
I. Components
The anti-dandruff and conditioning shampoo compositions of the present invention comprise an anionic surfactant, a conditioning agent, an anti-dandruff particulate, a cationic guar derivative, and an aqueous carrier. Each of these ingredients is described in detail below.
A. Anionic Surfactant
The anti-dandruff and conditioning shampoo compositions of the present invention comprise from about 5% to about 50%, by weight of the composition, preferably from about 8% to about 30%, more preferably from about 10% to about 25%, most preferably from about 12% to about 18%, of an anionic detersive surfactant component suitable for application to the hair or skin. The anionic detersive surfactant is believed to provide cleaning and lather performance to the composition. Additionally, the anionic detersive surfactant forms a coacervate, upon aqueous dilution, with the cationic polymer component (described below) of the present invention. This coacervate is believed to be important in providing the efficacy and conditioning benefits described herein.
The anionic detersive surfactant component can comprise an anionic detersive surfactant, a zwitterionic or an amphoteric detersive surfactant having an attached moiety that is anionic at the pH of the composition, or a combination thereof, preferably an anionic detersive surfactant. Such surfactants should be physically and chemically compatible with the essentia
Dunlop David Scott
Leyba Vicente Eduardo
Page Thurman K.
Paul Andrew A.
Peebles Brent M.
The Procter & Gamble & Company
Tran S.
LandOfFree
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