Antiperspirant products made from wet-milled anhydrous...

Details Antiperspirant products made from wet-milled anhydrous... Antiperspirant products made from wet-milled anhydrous...

2001-10-24

2003-09-02

Dodson, Shelley A. (Department: 1616)

Drug, bio-affecting and body treating compositions

Anti-perspirants or perspiration deodorants

C424S066000, C424S068000, C424S400000, C424S401000, C424SDIG005

Reexamination Certificate

active

06613312

ABSTRACT:

BACKGROUND OF INVENTION
Anhydrous antiperspirant products can assume many forms—for example soft-solids, roll-ons, and solid sticks. In the past, two problems have been associated with such antiperspirant products.
The first problem is one of stability. More specifically, since the antiperspirant active is included in these product forms, as a suspension, the antiperspirant active does have a tendency to settle out of the product. This can cause the product to be physically unstable. In addition, if antiperspirant active concentrates toward the bottom of a package, such as in a soft solid, solid, or roll-on, the consumer can notice a change in product strength as the product is used up. This change from a product that is too weak in its antiperspirant properties to one that is too strong in its antiperspirant properties can be unpleasant for the consumer.
A second problem associated with anhydrous antiperspirant products has been their tendency to leave white marks on the skin and on the clothes of the consumer.
It would be highly desirable to improve the stability of the antiperspirant active within the antiperspirant product. Doing this would enable the production of a product that had lower levels of suspending agents or gellants, and yet the antiperspirant active still would not settle out. Achieving this stability would also allow for the production of antiperspirant products which had a lower tendency to leave white marks on the skin or clothes. Achieving this stability would also allow for the production of a no-shake roll-on. Additionally, suspending agents or gellants can interfere with the antiperspirant active's ability to physically reach the sweat gland. Therefore using less suspending agents and gellants could improve efficacy.
Achieving these benefits is an object of the present invention.
Publications which are relate to this field of invention are as follows:
Product information sheet from Reheis on the Reach AZP-908 gel.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided an antiperspirant composition that comprises:
a) a wet-milled antiperspirant active material;
b) a silicone and/or hydrocarbon carrier material; and
c) a suspending agent or gellant, other than Al—Mg-hydroxystearate or cylco-methicone and dimethicone cross-polymer.
According to a second aspect of the invention, there is provided a method for improving the stability of an antiperspirant product comprising the use of an antiperspirant composition as described in the first aspect of the invention.
According to a third aspect of the invention, there is provided a method for treating human body odour, comprising the topical application of an antiperspirant composition as described in the first aspect of the invention.
According to a fourth aspect of the invention, there is provided a method for reducing the tendency of antiperspirant products to leave white marks on the skin and on the clothes of the consumer, said method comprising the use of an antiperspirant composition comprising:
a) a wet-milled antiperspirant active material; and
b) a silicone and/or hydrocarbon carrier material.
As noted above, stability of the antiperspirant active ingredient in a roll-on, stick or soft solid has been a problem in past formulations. More specifically, the antiperspirant active included in these product forms can have a tendency to settle out of the product, whether during manufacture or storage. It has been found that anhydrous antiperspirant active materials that have been wet-milled provide better product stability than corresponding anhydrous antiperspirant active materials that have been dry-milled.
As noted above, a second problem associated with antiperspirant products has been their tendency to leave white marks on the skin and on the clothes of the consumer. Again, it has been found that anhydrous antiperspirant active materials that have been wet-milled can leave less white marks on skin and clothes than corresponding anhydrous antiperspirant active materials that have been dry-milled.
Because anhydrous antiperspirant active materials that have been wet-milled can produce a more stable finished product than corresponding than anhydrous antiperspirant active materials that have been dry-milled, compositions with wet-milled antiperspirant active materials can be used in the production of a product that has lower levels of suspending agents or gellants, and yet the antiperspirant active still will not settle out. With lower levels of suspending agents or gellants, products can leave less whitening and residue on the skin. Additionally, using less suspending agents or gellants—which can interfere with the active's ability to physically reach the sweat gland—could improve efficacy.
Additional benefits to this active are its manufacturing impact. More specifically, the antiperspirant active that has been wet-milled is available in a liquid form making it potentially easier to transport to and within the production facility. Also, in its liquid form the antiperspirant active has reduced inhalation hazards to compounding staff.
DETAILED DESCRIPTION OF THE INVENTION
As used herein % means weight percent of the total composition unless otherwise specified. As used herein wet-milling means milling or grinding of antiperspirant salt in the presence of a liquid such as a silicone or hydrocarbon oil or ester.
The compositions of the present invention can be made from known ingredients or from ingredients that are analogous to known ingredients. The compositions of the present invention can be made by known methods or by methods that are analogous to known methods.
The antiperspirant compositions claimed in the present invention comprise:
a) a wet-milled antiperspirant active material;
b) a silicone and/or hydrocarbon carrier material; and
c) a suspending agent or structurant.
More specifically, compositions of the invention can contain about 20 to about 50% antiperspirant active material, and preferably 25 to 35% antiperspirant active material.
The silicones used in the compositions of the invention can be non-volatile silicones such as dimethicone or phenyl trimethicone.
The following is a description of the ingredients that can be used in the compositions of the invention.
Antiperspirant Active
It will be understood that the antiperspirant active material that is described below is wet-milled in the compositions of the invention. Wet-milling is done by means that are conventional in the art. Antiperspirant active powders that have been milled in the presence of liquids are referred to in this specification as wet-milled. Antiperspirant active powders that have been milled in the air are referred to in this specification as dry-milled.
The antiperspirant active in the compositions of the invention is present at from about 15 to about 50% and is a particulate material selected from the group consisting of aluminum zirconium complexes, aluminum chlorohydrates, aluminum chlorohydroxide and mixtures thereof. Aluminum zirconium trichloro hydrex-Gly is preferred.
As noted above, the present compositions contain from about 15% to about 50% by weight of a particulate antiperspirant material. These weight percentages are calculated on an anhydrous metal salt basis (exclusive of glycine, the salts of glycine, or other complexing agents). The particulate antiperspirant material preferably has particle sizes ranging from about 1 to about 100 microns, more preferably from about 1 to about 50 microns. They may be in impalpable or microscopic in form and preferably have a high bulk density (e.g. greater than about 0.7 g/cm
3
). Such materials include, for example, many aluminum or zirconium astringent salts or complexes and are well known in the art.
Any aluminum astringent antiperspirant salt or aluminum and/or zirconium astringent complex in particulate form can be employed herein. Salts useful as astringent antiperspirant salts or as components of astringent complexes include aluminum halides, aluminum hydroxyhalides, zirconyl oxy halides, zirconyl hydroxyhalides and mixtur

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