Stable solid deodorant product and method for manufacturing same

Abstract

The present invention provides a deodorant formulation having improved efficacy and stability. The deodorant formulation comprises propanediol, ethylhexylglycerin, and grapefruit seed extract as the principal deodorizing actives. The combination of these deodorizing active ingredients results in a formulation with strong efficacy. The deodorant formulation of the invention may further be formed into a stable solid stick product in accordance with the methods outlined herein.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a novel solid deodorant formulation, and a method for manufacturing a deodorant stick product having excellent stability and efficacy.BACKGROUND OF THE INVENTION[0002]Topical deodorant formulations for use in controlling odour in the underarm area have been available in the market for many years, in solid stick or liquid form. Deodorant compositions have contained deodorizing active ingredients of several types. For example, antimicrobial agents function to inhibit bacterial growth, thus reducing bacterial interactions with sweat gland secretions, which are responsible for producing undesirable odours. Malodour masking agents such as perfumes and fragrances function to mask the malodours produced by bacterial interactions. Malodour neutralizers are also available which serve to chemically fix malodours. Thus, deodorant actives known in the art have generally referred to topical materials which inhibit the formation of, mas...

AI Technical Summary

Benefits of technology

[0008]The present invention provides a natural deodorant formulation that exhibits excellent efficacy, at levels beyond those seen for other such formulations available in the prior art. Further, the formulation of the present invention exhibits improved stability once formed into a deodorant stick product in a container that is filled from the top opening compared with a bottom filled container. This product addresses the above-mentioned drawbacks of solid natural deodorant formulations and provides for a product with increased stability and therefore increased shelf life and commercial value.

Problems solved by technology

A problem with many of the deodorant formulations that form part of the prior art is that they have relied on ingredients that have been found to be detrimental to human health or irritating to the skin.

For instance, as substantiated by independent studies, a common deodorizing active material, triclosan, appears to be harmful to human skin and potentially carcinogenic.

Another common and effective ingredient in deodorant formulations, propylene glycol, has been found to be irritating to many consumers with sensitive skin.

In addition to the above needs in regard to deodorant formulations, a significant manufacturing issue with deodorant formulations that rely on natural ingredients and do not contain triclosan or propylene glycol is reduced stability and shelf life.

When solid stick formulations are created, a problem frequently encountered has been the shrinking of the deodorant stick after it has been poured into the container.

Natural deodorant formulations in particular have been plagued by the problem of the stick shrinking at ambient temperatures, such that the deodorant stick separates from the container wall.

This problem with solid cosmetic formulations is known in the industry as “sweating”, whereby moisture from the solid deodorant stick formulation condenses on the surface of the stick, and ultimately evaporates.

As it evaporates, the product shrinks back from the container edges and loses the original surface texture.

This results in an unattractive and unsalable product with poor surface characteristics.

It has been a significant and costly problem with many natural deodorant stick products.

The problem is believed to reside in the use of water and volatile alcohols in the natural deodorant formulation, which has arisen in prior art formulations, including those formulated to lack propylene glycol.

When such ingredients form a significant portion of the solid formulation, it is difficult to prevent these ingredients from condensing out of the solid stick and evaporating.

However, in formulating natural and substantially natural deodorant formulations in accordance with prior art teachings, it has been inevitable that the high percentage of water and volatile alcohols causes such stability problems.

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