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Patent Pick: Sonochemically Stabilized Coated Pigments

Contact Author Rachel Grabenhofer
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Powder Cosmetic 800

Patent Picks are chosen by the editors from publicly available sources. Today's highlight is a sonochemical approach to form meta-stable coated particles.

Sonochemical activation for meta-stable substances
WIPO Patent Application WO/2015/157685
Publication date: Oct. 15, 2015
Assignee: The Research Foundation for the State University of New York

This invention discloses a method for forming a particle having a core that is fully coated by a dual-layer coating comprising an inner hydrophilic composition, and an outer hydrophobic polymer.

The core particles are added to a hydrophilic solution and mixed together. The hydrophobic polymer is then added to form a mixture. The mixture is sonicated to coat the particles and the coated particles are separated and dried to form meta-stable coated particles.

Such surface treatment of pigments has been found, for example, to improve the ease with which they are incorporated into especially hydrophobic cosmetic formulations.

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