Patent ID: 8771903

Claim:
A process for producing a holographic film comprising: determining the TGA 95 of compounds useful as components for a photopolymer formulation, i) providing the photopolymer formulation comprising: A) matrix polymers, B) writing monomers, 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) applying the photopolymer formulation as a film to a substrate film; and iii) drying the photopolymer formulation on the substrate film at a temperature of between 60 to 120° C., wherein the components chosen for the photopolymer formulation are only compounds having a TGA 95 value greater than 100° C. and at least 30° C. above the drying temperature and wherein the photopolymer formulation has a plateau modulus of greater than or equal to 0.030 MPa, wherein the TGA 95 values of the individual photopolymer formulation components are determined by weighing an amount of about 10 mg of a sample of the respective component into a small aluminium pan having a volume of 70 μl, introducing the small aluminium pan an oven of a thermobalance, and measuring the loss of mass of the sample in the open small aluminium pan at a constant oven heating rate of 20 K/min, the start temperature of the oven being 30° C. and the end temperature 600° C., the oven being flushed with a 200 ml/min nitrogen stream during the determination and the temperature at which a loss of mass of the sample of 5% by weight, based on the originally weighed in amount of the sample, has occurred being determined as the TGA 95 value of the respective component.