Plastics film, use of dyestuffs therein and process for testing the authenticity of packaged goods
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United States of America Patent
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Jul 22, 2003
Grant Date -
N/A
app pub date -
Jan 16, 2001
filing date -
Jul 21, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dyestuff capable of undergoing a clearly visible colour change when contacted with a color-developing material is dispersed in the body of a plastics film and used in the identification of goods. The film can be used for packaging of the goods or as a label or seal affixed to the goods. When testing the authenticity of packaging goods, the plastics film is marked with the color-developing chemical to produce a colored mark on the package. The dyestuff is preferably a latent dyestuff which is colorless and invisible to the eye under ambient conditions for use of the film but which forms a clearly visible color when contacted with the color-developing material.
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