Method of casting a microstructure sheet having an array of prism elements using a reusable polycarbonate mold
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United States of America Patent
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-
Apr 30, 1996
Grant Date -
N/A
app pub date -
Jun 3, 1994
filing date -
Jun 3, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A durable reusable polymeric mold for casting a microstructure sheet having an array of prism elements and a method for forming the microstructure sheet are disclosed. A polymeric mold has a facet side and a base side including an array of prism elements upon which an radiation cured sheet can be formed. A protective surface layer can be formed on the facet side of the polymeric mold. The protective surface layer is sufficiently opaque to radiation to protect the polymeric mold from damage when the curable sheet is formed and is sufficiently bonded to the polymeric mold to allow the cured sheet to be removed from the protective surface layer while not substantially removing the protective surface layer from the polymeric mold. The microstructure sheet can be used as a retroreflective structure.
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