Printing diffraction gratings on paper and board
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United States of America Patent
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Apr 21, 2020
Grant Date -
Aug 1, 2019
app pub date -
Apr 5, 2019
filing date -
Jun 21, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed herein is a method for forming a surface relief microstructure, including the steps of A) applying a curable composition to at least a portion of the frontside of the paper substrate, B) contacting at least a portion of the curable composition with surface relief microstructure, C) curing the composition by using at least one UV lamp which is arranged on the backside of the paper substrate, and D) depositing a metallic layer, and optionally a layer of a transparent high refractive index material, on at least a portion of the cured composition, wherein the UV lamp has an emission peak in a UV-A range of 320 nm to 400 nm and additionally in a near VIS range of 400 nm to 450 nm, the curable composition comprises a photoinitiator which absorbs in the UV-A range and also in the near VIS range.
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