Basf Se Corporation

Ciba Specialty Chemicals Corporation

Cyrille Deshayes

Thomas Ehlis

Stefan Müller

Jürg Haase

Julie Grumelard

Sébastien Mongiat

Martin Vogt

Holger Paul

Disclosed is the use of an aqueous dispersion comprising (a) a micronized sparingly soluble organic benzophenone derivative of formula (1), selected from the crystal modifications (B) and (C), wherein the crystal modification (B) is characterized by a peak in the X-ray diffraction pattern at a d-spacing of about 7.70; and wherein the crystal modification (C) is characterized by a peak in the X-ray diffraction pattern at a d-spacing of about 7.06; and (b) a dispersing agent selected from anionic, non-ionic and amphoteric surfactants; for protecting the human skin from browning and skin aging. The new crystal modification (C) represents a thermodynamically stable compound of formula (1) at 25&#xb0; C. This modification is therefore suitable in dispersions comprising micro-fine particles. 

Crystal modifications of transmission dyes

The present invention relates to new UV-protection formulations with improved stability in respect to crystallisation, characterized in that a compound of formula (1) or a mixture thereof wherein

UV-protection formulations

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Rosenau, France

Cyrille Deshayes