PHOTOPOLYMER FORMULATION FOR PRODUCTION OF HOLOGRAPHIC MEDIA COMPRISING BORATES WITH LOW TG

摘要

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.