METHOD FOR PRODUCING A HOLOGRAPHIC FILM
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Abstract
The invention relates to a method for producing holographic films, in which a photopolymer formulation is provided which comprises as constituents matrix polymers, writing monomers, a photoinitiatior system, optionally a non-photopolymerizable component and optionally catalysts, radical stabilizers, solvents, additives and other auxiliaries and/or additives. The photopolymer formulation is applied in a planar manner and in the form of a film on a support film and the photopolymer formulation is dried on the support film at a temperature 60<T<120 DEG C, wherein only compounds are selected as components for the photopolymer formulation, the TGA 95 values of which are >100 DEG C and are above the temperature T by at least 30 DEG C, and a photopolymer formulation having a plateau module of =0.030 MPa is used.
127 Citations
37 Claims
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1-17. -17. (canceled)
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18. A process for producing a holographic film comprising:
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i) providing a photopolymer formulation comprising, as components, 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.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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29. The process according to claim 28, wherein the monofunctional writing monomer has a glass transition temperature of less than 0°
- C. and a refractive index of greater than 1.50 at 405 nm.
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30. The process according to claim 28, wherein the polyfunctional writing monomer has the formula (III)
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31. The process according to claim 30, wherein the polyfunctional writing monomer has a refractive index of greater than 1.50 at 405 nm.
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32. The process according to claim 18, wherein the photopolymer formulation comprises, as an additive, urethanes of the formula (V)
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33. The process according to claim 32, wherein at least one of the radicals R10, R11, R12 is substituted by at least one fluorine atom.
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34. The process according to claim 25, wherein the process further comprises:
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I. transporting and metering firstly component a), optionally mixed with one or more of the components B), C), D) and E), and secondly, separately therefrom, transporting and metering component b), optionally mixed with one or more of the components B), C), D) and E) II. devolatilizing the streams transported, metered and optionally premixed according to I) III. filtering the mixture obtained according to II) IV. homogenizing the mixture obtained according to III) V. unwinding and pre-treating the substrate material VI. coating the substrate material with the mixture obtained according to step IV) VII. drying the film coated according to VI) VIII. laminating the coated film obtained according to VII) IX. winding up of the laminated film obtained according to VIII)
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35. The process according to claim 18, wherein the photopolymer formulation is applied to the substrate film by a printing process.
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36. A holographic film obtained by the process according to claim 18.
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37. An optical element, an image, or an image representation or projection comprising the holographic film according to claim 36.
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Specification