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US 2011/0311905 A1Published application
Method for producing holographic photopolymers on polymer films
AssigneeBayer MaterialScience AG
InventorsDennis Hönel, Marc-Stephan Weiser, Friedrich-Karl Bruder, Thomas Rölle, Thomas Fäcke
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Abstract
The invention relates to a method for producing novel photopolymers on the basis of prepolymer-based polyurethane compositions that are suitable for producing holographic media, in particular for the visual display of images.
Claims14
-13. (canceled)
A continuous process for the production of photopolymer films, comprising coating a support film by the roll-to-roll principle with a photopolymer formulation comprising
- A) a polyisocyanate component which comprises an NCO-terminated polyurethane prepolymer having NCO groups primarily aliphatically bonded and which is based on hydroxy-functional compounds having an OH functionality of 1.6 to 2.05,
- B) isocyanate-reactive polyether polyols
- C) urethane acrylates and/or urethane methacrylates having at least one aromatic structural unit and a refractive index of greater than 1.50 at 405 nm, wherein the urethane acrylates and/or urethane methacrylates are free of NCO groups and OH groups
- D) free radical stabilizers
- E) photoinitiators based on combinations of borate salts and one or more dyes having absorption bands which at least partly cover the spectral range from 400 to 800 nm
- F) optionally catalysts
- G) optionally auxiliaries and additives.
4 more elements
Dependencies are inferred from the claim text.