Methods of making low residue antiperspirant gel-solid stick compositions

Abstract

Disclosed are methods of making anhydrous antiperspirant gel-solid stick compositions comprising a particulate antiperspirant active; a solid non-polymeric gellant that is substantially free of dibenzylidene alditol, n-acyl amino acid derivatives, organic polymeric gellants, and inorganic thickening agents; and an anhydrous liquid carrier having an average solubility parameter of from about 3 to about 13 (cal / cm<3>)<0.5>, wherein the composition has a visible residue index of from about 11 to about 30 L-value, a product hardness of from about 500 gram.force to about 5,000 gram.force, a rheology profile defined by a ratio of an elastic modulus (G') to a viscous modulus (G'') of from about 0.1 to about 100. The refractive indices of the particulate antiperspirant active, solid non-polymeric gellant, and anhydrous liquid carrier are not matched. The solid non-polymeric gellant is preferably a crystalline material having an average particle size of less than about 1 mu m, and / or has an elongated particle morphology having an aspect ratio of greater than about 2. These antiperspirant gel-solid stick compositions made in accordance with the methods herein provide improved low residue performance, efficacy and aesthetics.

Description

[0001] Field [0002] The present invention relates to a process for the preparation of an antiperspirant composition in the form of a gel-solid stick. In particular, the present invention relates to the preparation of antiperspirant compositions in the form of gel-solid sticks having selected product hardness, visible residual coefficient and rheology, and preferably having a crystalline gel matrix comprising small and / or elongated crystalline particles Methods. Gel-solid stick antiperspirant compositions prepared according to this method have improved low residue performance, efficacy and aesthetics. Background technique [0003] A variety of topical antiperspirant products are commercially available or known in the antiperspirant art. Most products are formulated as aerosols or sprays, roll-on liquids, creams, lotions, gels, gel-solids or other solid stick formulations and include astringent substances such as zirconium salt or...

AI Technical Summary

Problems solved by technology

However, the gel-solids described by Hofrichter et al. are limited to selected dual gellant systems and do not include or otherwise describe the preparation of low-residue antiperspirant gels containing any other gellant or gellant system. Glue - any method of solid stick