Photopolymer formulation for production of holographic media comprising borates with low TG

US10001703B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Horst Berneth · Leverkusen, DE
• Thomas Rölle · Leverkusen, DE
• Friedrich-Karl Bruder · Krefeld, DE
• Dennis Hönel · Wichterich, DE
• Marc-Stephan Weiser · Leverkusen, DE
• Thomas Fäcke · Leverkusen, DE
• Rainer Hagen · Leverkusen, DE
• Günther Walze

Key dates

• Filing date: Oct 13, 2014
• Grant date: Jun 19, 2018
• Expiry date: Oct 13, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2260/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a photopolymer formulation comprising a component reactive toward isocyanates, a polyisocyanate component, a writing monomer and a photoinitiator containing at least one dye and a coinitiator, characterized in that the coinitiator contains at least one substance of the formula (Ia)The invention further provides a process for preparing the specific coinitiators and the coinitiators obtainable by this process, and additionally a process for producing a holographic medium using the specific coinitiators, and a holographic medium obtainable using the inventive photopolymer formulation. The invention further relates to a laminate structure comprising an inventive holographic medium and likewise specific borates suitable as coinitiators.