POLYURETHANE COMPOSITION AND ITS APPLICATION FOR OBTAINING HOLOGRAPHIC MEDIA Russian patent published in 2014 - IPC C08G18/10 C08G18/32 C08G18/48 C08G18/67 C08G18/78 C08L75/04 G03F7/00 G11B7/245 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to polyurethane composition for obtaining holographic media. Claimed composition includes: A) polyisocyanate component; B) isocyanate-reactionable component, which includes, at least, 50 wt % calculated per the total mixtute of B) polyetherpolyols B1) with number average molecular weights higher than 1000 g/mol, which have refraction index n_D ²⁰<1.55 and contain one or several oxyalkyl links of formulae (I)-(III): -CH₂-CH₂-O- (I), -CH₂-CH(R)-O- (II), -CH₂-CH₂-CH₂O- (III), with R being alkyl or aryl residue, which can be substituted or broken with heteroatoms; C) compounds, which have refraction index n_D ²⁰>1.55 and contain groups, under action of actinic radiation reacting with ethylene-unsaturated compounds with polymerisation (radiation-solidified groups), and do not contain NCO-groups themselves; D) radical stabilisers; E) photoinitiators; F) catalysts if necessary; G) auxiliary substances and additives if necessary. Also described are: method of obtaining media for recording visual holograms, medium for recording visual holograms, application of such medium and method of hologram recording.

EFFECT: obtaining polyurethane composition, providing better contrast ratio and improved hologram brightness without impairing compatibility of matrix polymer and recording monomer.

11 cl, 2 dwg, 7 ex