Holographic medium having a protective layer

US9195215B2 · kind B2 · utility

Assignee

• Bayer Intellectual Property GmbH · DE

Inventors

• Marc-Stephan Weiser · Leverkusen, DE
• Daniel Hentschel
• Joachim Petzoldt · Monheim, DE
• Pantea Nazaran · Neunburg vorm Wald, DE
• Sebastian Dörr · Mülheim an der Ruhr, DE
• Dirk Dijkstra
• Ute Flemm · Solingen, DE
• Dennis Hönel · Wichterich, DE
• Friedrich-Karl Bruder · Krefeld, DE
• Thomas Fäcke · Leverkusen, DE
• Thomas Rölle · Leverkusen, DE

Key dates

• Filing date: Nov 11, 2012
• Grant date: Nov 24, 2015
• Expiry date: Nov 11, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2260/12
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention relates to a holographic medium comprising a protective layer and a photopolymer film which is bonded to the protective layer and contains polyurethane matrix polymers, acrylate writing monomers and photoinitiators, wherein the protective layer is impermeable to the constituents of the photopolymer film, is optically clear and is transparent to electromagnetic radiation having a wavelength in the range of from 350 to 800 nm. The invention further provides the use of a holographic medium according to the invention in the production of holograms, and a process for the production of a holographic medium according to the invention.