Identification card with a radiant energy reactive coating

Details Identification card with a radiant energy reactive coating Identification card with a radiant energy reactive coating

1983-08-05

1985-10-01

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

427 541, B42D 1500, B05D 306

Patent

active

045441839

ABSTRACT:
A multi-layered engraved identification card includes a base layer having a first color and a color-changeable layer initially having a second color which is changeable to a third color contrasting with the first color upon exposure to radiant energy preferably having a wavelength of from 3,500 to 5,000 Angstroms, for a specified period of time. The color-changeable layer is initially prepared as a solution of a resin, a plasticizer, a radiant energy-sensitive coloring agent for causing the color change, and a solvent in which both the base and the resin of the solution are soluble. Alternatively, the solution may further include a cross-linkable plasticizer with a peroxide to cause the resin of the solution and the plastic of the base to be cross-linked and hence bonded permanently to the base. The engraving may be done after the color-changeable layer is formed on the base, or alternatively, the base may be first engraved and the color-changeable solution applied to the non-engraved surface regions or applied to fill the engraved depressions.

REFERENCES:
patent: 3520758 (1970-07-01), Wiest
patent: 3732119 (1973-05-01), Churchill et al.
patent: 3930924 (1976-01-01), Oka et al.
patent: 4052739 (1977-10-01), Hasanobu et al.
patent: 4307899 (1981-12-01), Hoppe
patent: 4451068 (1984-05-01), Hall et al.

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