| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a polyurethane composition for producing holographic media, which includes: (A) a polyisocyanate component containing at least one polyurethane prepolymer with a terminal isocyanate group with isocyanate group functionality of 1.9-5.0, for which the isocyanate group is attached to a primary aliphatic residue and which is based on compounds with hydroxyl functional groups with hydroxyl group functionality of 1.6-2.05, (B) polyether polyols which react with isocyanates, (C) urethane acrylates and/or urethane methacrylates with at least one aromatic structural unit and with a refraction index greater than 1.50 at 405 nm, which are free of isocyanate groups and hydroxyl groups, (D) radical stabilisers, (E) photoinitators based on combinations of borate salts and one or more dyes with absorption bands which at least partially overlap the spectral region from 400 to 800 nm, (F) optionally catalyst and (G) optionally auxiliary substances and additives. The invention also describes a method of producing media for recording visual holograms, media for recording visual holograms, use of such a medium and a method of recording holograms.EFFECT: producing polyurethane compositions for producing holographic media having high surface quality, good processing properties and good contrast with respect to refraction index.14 cl, 2 dwg, 4 ex |
