Method and compositions for authenticating a product or document

Details Method and compositions for authenticating a product or document Method and compositions for authenticating a product or document

1995-05-31

1997-01-21

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 21R, 427 7, 428 29, C09D 1102

Patent

active

055955908

ABSTRACT:
A method and compositions for authenticating a document or article comprises applying a mixture of a carrier, a leuco dye and an activator to a surface of a document or article, wherein the leuco dye and activator react in response to a rubbing force applied to the surface to change color and wherein the activator is at least one selected from the group consisting of amidophenol, anilides with hydroxyl groups and benzoamides with hydroxyl groups and authenticating the document or article by applying a rubbing force to the surface to effect a color change.

REFERENCES:
patent: 4180405 (1979-12-01), Lawton
patent: 5057154 (1991-10-01), Kusakata et al.
patent: 5178669 (1993-01-01), Watanabe et al.
patent: 5250108 (1993-10-01), Tanaka et al.
patent: 5350634 (1994-09-01), Sumii et al.
patent: 5485792 (1996-01-01), Keyser et al.

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