Photopolymer formulation for producing holographic media

摘要

The invention relates to a photopolymer formulation, comprising at least one polyol component, a polyisocyanate component, a write monomer, a photoinitiator, and a catalyst, wherein the photopolymer formulation has an activation temperature >8300 K. The invention further relates to a method for producing a holographic medium, to a holographic medium that can be obtained according to the method according to the invention, and to the use of a holographic medium according to the invention for producing a hologram.

主权项

1. A method for preparing a photopolymer formulation comprising mixing a polyol component, a polyisocyanate component, a writing monomer, a photoinitiator, and a catalyst to form a liquid mixture and determining an activation temperature of the liquid mixture, wherein the photopolymer formulation has the activation temperature ≧8300 K, and wherein the activation temperature is determined by determining both the storage modulus G′ and the loss modulus G″ of the mixture over a measurement time t, at least until the condition of the gel point G′=G″=GGel at time tGel is reached, at temperatures T=303 K, 313 K, 328 K, 343 K and 353 K using a plate-plate measuring system of a rheometer at a plate spacing of 250 μm in the oscillation mode at a constant frequency f of 10 Hz and a regulated deformation amplitude of 10%; establishing a logarithmic plot of tGel versus the respective inverse absolute temperature 1/T at which tGel was determined; and using linear regression to determine the activation temperature TAkt as per the formula
ln(tGel/min)=TAkt/T+A as the slope of the straight line in the plot.