Photoinitiators for photopolymers
AssigneeCovestro Deutschland AG
InventorsThomas Rölle, Horst Berneth, Friedrich-Karl Bruder, Thomas Fäcke, Marc-Stephan Weiser, Dennis Hönel
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Abstract
The present invention relates to novel photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer and a photoinitiator comprising a dye of formula (I). The present invention further relates to a holographic medium which contains a photopolymer formulation of the present invention or is obtainable by using same, to the use of a photopolymer formulation of the present invention for producing holographic media and also to a process for producing a holographic medium by using a photopolymer formulation of the present invention.
Claims18
A photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer and a photoinitiator, wherein the photoinitiator contains a dye of general formula (I),
- wherein
- A represents N,
- E represents boron, and substituted with two halogen radicals or with one radical selected from oxygen and sulphur, and
- R1 and R3 each independently represent an optionally substituted aromatic radical, and
- R2 represent hydrogen, halogen, cyano, nitro, optionally fluorinated alkoxy or an optionally substituted aromatic, aliphatic or araliphatic radical.
Dependencies are inferred from the claim text.