Holographic media with improved light sensitivity

US9804490B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Thomas Rölle · Leverkusen, DE
• Horst Berneth · Leverkusen, DE
• Friedrich-Karl Bruder · Krefeld, DE
• Dennis Hönel · Wichterich, DE
• Thomas Fäcke · Leverkusen, DE
• Günther Walze
• Rainer Hagen · Leverkusen, DE
• Christian Diedrich · Mülheim an der Ruhr, DE

Key dates

• Filing date: Dec 16, 2014
• Grant date: Oct 31, 2017
• Expiry date: Dec 16, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/24044
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present invention provides a novel photopolymer formulation comprising matrix polymers, writing monomer and a photoinitiator and further comprising a compound of formula (1)where A1, A2 and A3 are each independently hydrogen, fluorine, chlorine, bromine or iodine, R1, R2, R3, R4 and R5 are each independently hydrogen, halogen, cyano, nitro, amino, alkylimino, azide, isonitrile, enamino, formyl, acyl, carboxyl, carboxylate, carboxamide, orthoester, sulphonate, phosphate, organosulphonyl, organosulphoxidyl, optionally fluorinated alkoxy or an optionally substituted aromatic, heteroaromatic, aliphatic, araliphatic, olefinic or acetylenic radical while suitable radicals may be connected together via bridge of any desired substitution, or in that two or more compounds of formula (I) may be connected together via at least one of the radicals R1, R2, R3, R4 and R5, in which case these radicals therein constitute a 2- to 4-tuply functional bridge, with the proviso that at least one of the radicals R1, R2, R3, R4 and R5 is not hydrogen. Further subjects of the invention are a photopolymer comprising matrix polymers, a writing monomer and photoinitiator, a holographic medium comprising a…