Patent ID: 8889321

Claim:
A process for producing holographic films comprising i) providing a photopolymer formulation comprising: A) matrix polymers as amorphous network, B) a combination of a monofunctional writing monomer and a polyfunctional writing monomer, C) a photoinitiator system, D) optionally a non-photopolymerizable component, and E) optionally catalysts, free radical stabilizers, solvents, additives and other auxiliaries and/or additives ii) determining the plateau modulus G 0 of the photopolymer formulation by measuring the curing of the matrix in an oscillation rheometer, as follows: Oscillation measuring mode at a constant circular frequency ω 0 of 10 rad/s and a regulated deformation amplitude of 1%; Temperature 50° C., normal force regulation set at 0 Newton Recording of the storage modulus G′ over the measuring time up to a constant value Gmax of G′ was reached or for not more than 3 hours; this value is taken as plateau modulus G 0 ; iii) applying the photopolymer formulation as a film extensively to a substrate, and iv) drying the film, wherein the photopolymer formulation has a plateau modulus G 0 of ≧0.03 MPa.