According to a recent L'Oréal patent disclosure, it can be challenging to obtain emulsion deodorant sticks with desirable mechanical properties, e.g., sufficient hardness and deposition, for application to the underarm area. Furthermore, although aluminum salts traditionally used in such products have not proven harmful to health, they are generally undesired by consumers.
See related: Controlling Odor and Wetness in a Newer, Greener Age
Alternative deodorant actives have been explored. Magnesium salts such as magnesium oxide and hydroxide have reportedly shown to same level of anti-odor efficacy as aluminum salts in aerosols. Magnesium oxide and hydroxide, however, are difficult to stabilize in deodorant emulsion sticks with desirable mechanical properties.
According to the inventors, there thus remains a need for stable, well-dispersed, hard and integrated deodorant emulsion sticks comprising a magnesium salt instead of, for example, aluminum salt. The present invention addresses this need.
Emulsion Stick with Magnesium Actives for Anti-odor Efficacy
WIPO Patent Application WO/2022/150889
Publication date: July 21, 2022
Assignees: L'Oreal and Manuela Mello
This patent disclosure describes stable deodorant emulsion sticks comprising a magnesium salt. The inventors have discovered that the anhydrous sticks have a good sensory profile, improved stability, great dispersion, optimal hardness, excellent payload and statistically superior anti-odor efficacy.
More specifically, the stick comprises magnesium hydroxide and a combination thereof; ~0.5%-4.0% w/w of a surfactant selected from PEG/PPG-18/18 dimethicone, cetyl PEG/PPG- 10/1 dimethicone, polyglyceryl-3 diisostearate and a combination thereof; ~14%-17% w/w of an oil selected from isopropyl palmitate, dimethicone and a combination thereof; and ~8%-10% w/w of a wax (e.g., polyethylene), a filler and water. The stick is free of an aluminum salt and comprises a reversed emulsion. The stick may comprise ~2%-3% w/w of the magnesium salt.
The stick may further comprise a preservative selected from phenoxyethanol, pentylene glycol and a combination thereof; may be free of beheneth-10, a fragrance or a combination thereof; may be free of a clay; and may have a pH of no more than 10.
See related: Formulating Forum; Deodorants Versus Antiperspirants