Interference pigments for preparing forgeryproof documents
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United States of America Patent
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Nov 12, 1996
Grant Date -
N/A
app pub date -
Apr 21, 1995
filing date -
Dec 11, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Interference pigments based on multiply coated plateletlike silicatic substrates comprising A) a first layer comprising a colorless or selectively absorbing metal oxide with a high refractive index, B) a second, non-selectively absorbing, semitransparent layer consisting essentially of carbon, a metal or a metal oxide, and optionally C) a third layer comprising a colorless or selectively absorbing metal oxide in combination with scattering color pigments which are complementary in color to the reflection color of the interference pigments are useful for preparing valuable documents that are forgeryproof.
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