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Holographic media with protective layer

A technology of holographic medium and protective layer, applied in the field of holographic medium, can solve the problems of hindering the exposure of holograms, poor wettability, turbidity, etc.

Active Publication Date: 2017-06-06
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the altered chemical structure of the photopolymers used here, most of the compositions mentioned there are not suitable for the protective layer in this case, because, due to clouding, contact with the unexposed photopolymer Reactivity, incompatibility or poor wettability which prevent exposure of holograms into photopolymer films

Method used

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  • Holographic media with protective layer
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  • Holographic media with protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0217] Measurement methods :

[0218] The stated OH numbers are determined according to DIN 53240-2.

[0219] The NCO values ​​(isocyanate content) stated are determined according to DIN EN ISO11909.

[0220] The stated amine values ​​were determined by Currenta GmbH & Co. OHG, Leverkusen, Germany, with test method AFAM 2011-0605401-05 D similar to DIN 16945, chapter 5.6, where, in contrast to DIN, the perchloric acid solution was purchased , and the endpoint was determined potentiometrically.

[0221] solid content

[0222] Tare the uncoated can ends and paper clips. Then, approximately 1 g of the sample to be studied is distributed evenly with appropriately bent paper clips after initial weighing in the jar lid. The paper clip remains in the sample for measurement. The initial weight was determined and then heated in a laboratory oven at 125°C for 1 hour before the final weight was determined. Determine the solids content according to the following formula: final wei...

Embodiment 1

[0344] The 2K-PU-system is used. Here, the 9.1g NH 1420 was initially weighed in a Speedmix beaker and 5.894g was added N 3900 and 0.060g UL 28 and mixed briefly. The resulting liquid mass is then applied to the photopolymer film 1 in the dark by means of an automatic film-forming device. Cured in a dry oven for 2 hours at 60°C, followed by overnight at room temperature. Maximum Δn: 0.0059 (532nm).

Embodiment 2

[0346] The 2K-PU-system is used. Here, the 8.969g NH 1420 was initially weighed in a Speedmix beaker and 6.025g was added N 3600 and 0.060g UL 28 and mixed briefly. The resulting liquid mass is then applied to the photopolymer film 1 in the dark by means of an automatic film-forming device. Cured in a dry oven for 2 hours at 60°C, followed by overnight at room temperature. Maximum Δn: 0.0051 (633nm).

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Abstract

The present invention relates to a holographic medium comprising a protective layer and a photopolymer film bonded to said protective layer, said photopolymer film comprising a polyurethane-matrix polymer, an acrylate-writing monomer and a photoinitiator, wherein said protective The layer is formed to be opaque to the components of the photopolymer film, optically clear and transparent to electromagnetic radiation having a wavelength in the range of 350-800 nm. Further subjects of the invention are the use of the holographic medium according to the invention for the production of holograms and the production method of the holographic medium according to the invention.

Description

technical field [0001] The present invention relates to a holographic medium comprising a protective layer and associated with the protective layer a photopolymer film comprising a polyurethane-matrix polymer, an acrylate-writing monomer and a photoinitiator. Further subjects of the invention are the use of the holographic medium according to the invention for producing holograms and a method for producing the holographic medium according to the invention. Background technique [0002] Holographic media for recording volume holograms are described in patent applications EP 2 218 743, EP 2 372 454, WO 2011 / 054791 and WO 2011 / 067057. Prior art media consisted of a slightly tacky photopolymer film. Therefore, in order to avoid the adhesion of dust and other interfering particles, it is necessary to protect the photopolymer film by covering it with an opaque lamination film. Furthermore, said stickiness causes problems when replicating holograms into the photopolymer film. It...

Claims

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Application Information

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IPC IPC(8): G11B7/2542
CPCG11B7/2542G03H2250/39G03H2260/12G03H1/0248G03H1/0256G03H2001/0264
Inventor M-S.魏泽D.亨切尔J.佩措尔特P.纳扎兰S.德尔D.迪克斯特拉U.弗莱姆D.赫内尔F-K.布鲁德T.法克T.罗勒
Owner COVESTRO DEUTSCHLAND AG