Patent Picks—Water Resistance, Vitamin D, Lactone for Stabilization and More
By: Rachel L. Grabenhofer
Posted: June 1, 2011
Chosen biweekly for their relevance to personal care by Rachel Grabenhofer, editor of Cosmetics & Toiletries magazine, Patent Picks are taken from publicly available sources. This edition features patents related to sun care and photoprotective technologies.
Broad-spectrum uva stable, non-toxic, zinc oxide based complex
WIPO Patent Application WO/2011/063329
Publication Date: May 26, 2011
Assignee: GL Grune
Disclosed in this patent is a new compound that also is presented as a dispersion with broad UVA and UVB spectral absorption stability, heat absorption, and insulation properties, as well as antimicrobial water resistance and high SPF properties. The zinc oxide complex described comprises distilled water buffered to a pH of > 10 using ammonium hydroxide, L-arginine or other buffering agents; and zinc oxide particles. The complex may be dried and rinsed to increase stability. An emollient, such as glycerin, and/or an emulsifier such as a combination of cetearyl alcohol and cetearyl glucoside and/or sodium stearoyl glutamate and/or cetearyl glucoside may also be added to the zinc oxide complex. According to the invention, the complex is made from natural-based, earth-derived, Ecocert-certified ingredients, is nontoxic and may be used or combined with any compound wherein UVA/UVB stability is desired. The applications for the complex are numerous and include automobile and aircraft parts, textiles, and semi-conductor technologies, as well as sunscreens and cosmetics.
Topical compositions having TiO2 particles with improved water resistance
WIPO Patent Application WO/2011/061133
Publication date: May 26, 2011
Assignee: DSM IP Assets B.V., T Satzinger and H Westenfelder
The present invention relates to a method of improving the water resistance of micronized double coated titanium dioxide (TiO2) particles having an inner inorganic silica coating and an outer silicone coating. Said particles are incorporated into a topical composition in the form of a dispersion in C12-15 alkyl benzoate and polyglyceryl-2 dipolyhydroxystearate. Furthermore, the invention relates to the topical compositions comprising the dispersions, including sunscreens.