FIELD: chemistry.
SUBSTANCE: invention relates to polyurethane compositions for producing holographic media which contain (A) one or more polyisocyanates, (B) one or more block copolymers which react with isocyanate, (C) one or more compounds having groups which, during actinic exposure, react with ethylenically unsaturated compounds with polymerisation, (D) optionally one or more free-radical stabilisers and (E) one or more photoinitiators. Topographic media obtained from such polyurethane compositions are also described.
EFFECT: obtaining polyurethane systems having excellent compatibility of the polyurethane polymer matrix with radiation-curable olefinically unsaturated monomers in the composition, and have considerably higher transparency.
13 cl, 3 tbl
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