Optically variable multilayer film and optically variable pigment obtained therefrom
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United States of America Patent
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Aug 1, 1995
Grant Date -
N/A
app pub date -
Oct 20, 1993
filing date -
Oct 20, 1993
priority date (Note) -
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Abstract
An optically variable pigment being formed from optically variable flakes. The optically variable multilayer is vacuum deposited onto a flexible polyester substrate having being provided with a release layer. An optically variable stack is formed from an opaque metallic reflective layer and two sub-unit film stacks D'MD symmetrically stacked on the opposite surfaces of the metallic reflective layer. D is adjacent to the reflective layer and is a color-presenting layer and D' is an outer layer of the stack which is used to protect the multilayer film to obtain better color-presenting. M is a semitransparent metallic layer, e.g. chromium.
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