Identification card with heat reactive coating

Details Identification card with heat reactive coating Identification card with heat reactive coating

1982-03-19

1985-05-28

Spruill, Robert L.

Printed matter

Having revealable concealed information, fraud preventer or...

Identifier

283 72, B42F 1500

Patent

active

045196320

ABSTRACT:
A multi-layered engraved identification card includes a base layer having a first color and a color-changeable, heat sensitive layer initially having a second color which is changeable to a third color contrasting with the first color upon heating to a first temperature for a specified period of time. The color-changeable layer is initially prepared as a solution of a resin, a plasticizer, a heat-sensitive coloring agent for causing the color change, and a solvent in which both the base and the resin of the solution are soluable. 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:
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patent: 3855033 (1974-12-01), Staats
patent: 3897964 (1975-08-01), Oka et al.
patent: 3930924 (1976-01-01), Oka et al.
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patent: 4052739 (1977-10-01), Wada et al.
patent: 4079673 (1978-03-01), Bernstein
patent: 4251593 (1981-02-01), Sakamoto et al.
patent: 4273602 (1981-06-01), Kosaka et al.
patent: 4311750 (1982-01-01), Kubo et al.
patent: 4311758 (1982-01-01), Oeda et al.
patent: 4324420 (1982-04-01), Kosche
patent: 4367071 (1983-01-01), Mizuno

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