Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Ute Flemm

Friedrich-Karl Bruder

Thomas Fäcke

Thomas Rölle

Dennis Hönel

Marc-Stephan Weiser

Horst Berneth

Sebastian Dörr

Joachim Petzoldt

Dirk Dijkstra

Pantea Nazaran

Sascha Tadjbach

Daniel Hentschel

The present invention relates to a layer composite comprising an exposed photopolymer film and an adhesive layer which is connected to the photopolymer film at least in certain regions, wherein the photopolymer film comprises crosslinked polyurethane matrix polymers A), crosslinked writing monomers B) and a monomeric fluoroethane additive C), wherein the adhesive layer is in the form of a diffusion barrier for the fluoroethane additive C). The invention also relates to the use of the layer composite for producing chip cards, ID documents or 3D images, as a product protective label, as a label, in banknotes in the form of a strip or window or as holographically optical elements in displays.

Layer composite consisting of a photopolymer film and an adhesive layer

This invention relates to a holographic medium comprising a protective layer and a photopolymer film which is bonded to the protective layer and contains polyurethane matrix polymers, acrylate writing monomers and photoinitiators, wherein the protective layer is impermeable to the constituents of the photopolymer film, is optically clear and is transparent to electromagnetic radiation having a wavelength in the range of from 350 to 800 nm. The invention further provides the use of a holographic medium according to the invention in the production of holograms, and a process for the production of a holographic medium according to the invention.

Holographic medium having a protective layer

The present invention relates to a laminate structure comprising a protective layer and an exposed photopolymer layer, the laminate structure being obtainable by reacting at least one radiation-curing resin I), an isocyanate-functional resin II) and a photoinitiator system III), and the radiation-curing resin I) containing &#x2266;5% by weight of compounds having a weight-average molecular weight of &#x3c;500 and &#x2267;75% by weight of compounds having a weight-average molecular weight of &#x3e;1000, the isocyanate-functional resin II) containing &#x2266;5% by weight of compounds having a weight-average molecular weight of &#x3c;500, and the protective layer containing the radiation-curing resin I) at least to an extent of 80% by weight and the isocyanate-functional resin II) at most to an extent of 15% by weight. The invention further provides a process for producing the inventive laminate structure.

Laminate structure comprising a protective layer and an exposed photopolymer layer

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Solingen, Germany

Ute Flemm