Hot embossing of grating-based optically variable images in thermoplastic acrylic lacquer |
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Authors: | P W Leech R A Lee |
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Affiliation: | (1) CSIRO Manufacturing and Materials Technology, Clayton, VIC, 3169, Australia |
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Abstract: | We report the novel use of thermoplastic acrylic lacquer (automotive paint) in the hot embossing of nanoscale structures.
Replicas of grating arrays have been produced in coatings of acrylic lacquer using a standard embossing process. The master
dies for the experiments comprised grating arrays fabricated by electron beam lithography. Grating patterns with a pitch of
0.7–1.3 μm were configured to produce diffractive images over an area of ∼25 × 25 mm. The embossing experiments used a replicated
Ni shim as a die and were performed at 100–150 °C and 80 kN force. A temperature above the glass transition temperature for
the lacquer, T = 120–150 °C, was required in order to achieve a uniform impression across the embossed area of ∼80 × 80 mm.
The diffractive grating patterns which were embossed into acrylic lacquer have shown optical effects suitable as a security
feature including image switching and color movement. |
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Keywords: | |
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