# US 8,771,903 B2 · Method for producing a holographic film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,903 B2 - Document ID: US8771903B2 - Status: Granted - Kind: B2 - Application number: 13/504,563 - Filed: 2010-11-02 - Published: 2012-08-23 - Granted: 2014-07-08 - Earliest claimed: 2009-11-03 - Assignees: Bayer MaterialScience AG - Applicants: Dennis Hönel; Marc-Stephan Weiser; Friedrich-Karl Bruder; Thomas Rölle; Thomas Fäcke - Inventors: Dennis Hönel; Marc-Stephan Weiser; Friedrich-Karl Bruder; Thomas Rölle; Thomas Fäcke - Web page: https://patentgrep.com/patent/US8771903B2 ## CPC - G01N 5/04: by removing a component, e.g. by evaporation, and weighing the remainder - G03H 1/02: Details {of features involved during the holographic process; Replication of holograms without interference recording} - G03H 1/04: Processes or apparatus for producing holograms (G03H1/26 takes precedence) - G11B 7/24044: for storing optical interference patterns, e.g. holograms; for storing data in three dimensions [3D], e.g. volume storage (G11B7/24038 takes precedence) - G11B 7/245: containing a polymeric component - G03H 2001/0264: {Organic recording material} - G03H 2227/04: Production line for mass production - G03H 2260/12: Photopolymer - G03H 2260/54: Photorefractive reactivity wherein light induces photo-generation, redistribution and trapping of charges then a modification of refractive index, e.g. photorefractive polymer - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00}) - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## 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 60100 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The process according to claim 1, wherein the photopolymer formulation is dried at a temperature of between 70 to 100° C. ### Claim 3 (depends on 1) The process according to claim 1, wherein the photopolymer formulation has a plateau modulus of from 0.03 to 1 MPa. ### Claim 4 (depends on 1) The process according to claim 1, wherein the process further comprises applying a laminating film to the film after the drying in step iii). ### Claim 5 (depends on 4) The process according to claim 4, wherein the film is rolled up together with the laminating film. ### Claim 6 (depends on 1) The process according to claim 1, wherein the matrix polymers comprise polyurethanes. ### Claim 7 (depends on 6) The process according to claim 6, wherein the polyurethanes are obtained by reacting an isocyanate component a) and an isocyanate-reactive component b). ### Claim 8 (depends on 7) The process according to claim 7, wherein the process further comprises: 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). ### Claim 9 (depends on 1) The process according to claim 1, wherein the writing monomers comprise acrylates and/or meth(acrylates). ### Claim 10 (depends on 1) The process according to claim 1, wherein the writing monomers comprise a combination of a monofunctional and a polyfunctional writing monomer. ### Claim 11 (depends on 10) The process according to claim 10, wherein the monofunctional writing monomer has the formula (II) wherein R1, R2, R3, R4, R5, in each case independently of one another, represent a hydrogen or halogen atom or a C1-C6-alkyl, trifluoromethyl, C1-C6-alkylthio, C1-C6-alkylseleno, C1-C6-alkyltelluro or nitro group, with the proviso that at least one substituent of the group R1, R2, R3, R4, R5 is not hydrogen, R6, R7, in each case independently of one another, represent hydrogen or a C1-C6-alkyl group, and A represents a saturated or unsaturated or linear or branched C1-C6-alkyl radical or a polyethylene oxide radical or a polypropylene oxide radical having in each case 2-6 repeating units in the polymer chain. ### Claim 12 (depends on 11) The process according to claim 11, 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. ### Claim 13 (depends on 1) The process according to claim 1, wherein the photopolymer formulation comprises, as an additive, urethanes of the formula (V) wherein n is a number from 1 to 8 and R10, R11, R12 independently of one another, represent hydrogen or linear, branched, cyclic or heterocyclic organic radicals which are unsubstituted or optionally also substituted by heteroatoms. ### Claim 14 (depends on 13) The process according to claim 13, wherein at least one of the radicals R10, R11, R12 is substituted by at least one fluorine atom. ### Claim 15 (depends on 1) The process according to claim 1, wherein the photopolymer formulation is applied to the substrate film by a printing process.