Photopolymer formulations for producing holographic media having highly crosslinked matrix polymers

US9760060B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Horst Berneth · Leverkusen, DE
• Thomas Roelle · Leverkusen, DE
• Friedrich-Karl Bruder · Krefeld, DE
• Thomas Fäcke · Leverkusen, DE
• Marc-Stephan Weiser · Leverkusen, DE
• Dennis Hönel · Wichterich, DE

Key dates

• Filing date: Aug 14, 2015
• Grant date: Sep 12, 2017
• Expiry date: Aug 14, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/24044
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer, and a photoinitiator, containing a coinitiator and a dye having the formula F An, where F stands for a cationic dye and An″ stands for an anion, wherein the dye having the formula F An comprises a water absorption of =5%. The invention further relates to a holographic medium, in particular in the form of a film, containing a photopolymer formulation according to the invention, to the use of such a medium for recording holograms, and to a special dye that can be used in the photopolymer formulation according to the invention.