UV ABSORBING COMPOSITION Russian patent published in 2012 - IPC C08J3/22 C08K3/22 C08K9/00 C09C1/36 

FIELD: physics.

SUBSTANCE: described is a polymeric UV absorbing composition, having E₃₀₈/E₅₂₄ ratio greater than 10 and attenuation coefficient E₅₂₄ at 524 nm less than 2.0 l/g/cm. Said composition contains an organic resin, titanium dioxide particles and a dispersion medium. The titanium dioxide particles in the dispersion medium have average volumetric diameter less than 85 nm. The dispersion medium is preferably selected from a group consisting of glycerine ethers, glycerine esters, alkylamides, alkanolamines and mixtures thereof. The invention also discloses a method of obtaining said UV absorbing composition, involving preparation of (i) a mother composition with titanium dioxide particle concentration of 1-50% of the total weight of the mother batch, and mixing the mother composition with a substrate organic resin, or obtaining (ii) a dispersion of titanium dioxide particles in an organic dispersion medium containing at least 35% titanium dioxide particles per total weight of the dispersion, and directly adding the dispersion into the substrate organic resin. Concentration of the organic medium in the composition ranges from 20 to 95% of the total weight of the composition.

EFFECT: composition endows polymer materials with effective UV absorption and transparency, as well as nontoxicity and biodegradability.

16 cl, 6 ex