ZINC OXIDE Russian patent published in 2009 - IPC C09C1/04 A61K8/27 A61Q17/04 C01G9/02 

FIELD: chemistry.

SUBSTANCE: proposed dispersion contains zinc oxide particles in a dispersion medium, where zinc oxide particles in the dispersion have average volumetric diameter ranging from 70 to 130 nm. Less than 16% of the particles have volumetric diameter below the average value by less than 35 nm, and more than 84% particles have volumetric diameter above the average value by less than 57 nm. The oxide particles have absorption coefficient at 524 nm (E₅₂₄) between 0.1 and 1.0 l/g/cm, absorption coefficient at 450 nm (E₄₅₀) between 0.3 and 2 l/g/cm, absorption coefficient at 360 nm (E₃₆₀) between 11 and 20 l/g/cm, absorption coefficient at 308 (E₃₀₈) between 11 and 20 l/g/cm, maximum absorption coefficient E(max) between 12 and 20 l/g/cm and λ(max) between 363 and 377 nm. The proposed sunscreen product contains the indicated zinc oxide particles or dispersion.

EFFECT: reduced bleaching effect and increased transparency of sun-screeners, containing zinc oxide particles.

25 cl, 3 ex