Reversibly photochromic printing inks

Details Reversibly photochromic printing inks Reversibly photochromic printing inks

1988-01-12

1997-05-20

Houtteman, Scott W.

Compositions: coating or plastic

Coating or plastic compositions

Marking

523161, C09D 1102

Patent

active

056308698

ABSTRACT:
Photochromic printing inks are disclosed which are in particular used for the printing of security documents. Prints are normally nearly colorless and become colored when energy irradiated, such as by ultraviolet light. This photocoloration is reversible. The printing inks contain photochromic compounds which are protected against other ink components. Methods are described to prepare the inks, to print security documents, and to detect counterfeiting.

REFERENCES:
patent: 4064287 (1977-12-01), Lipson et al.
patent: 4166043 (1979-08-01), Uhlmann et al.
patent: 4199359 (1980-04-01), Weigl et al.
patent: 4400216 (1983-08-01), Arora
patent: 4654082 (1987-03-01), Frilette
patent: 4931220 (1990-06-01), Haynes et al.
A.E.J. Wilson, "Applications of Photochromic Polymer Films", Phys. Technol., vol. 15, 1984, pp. 232-239.
WPI (Derwent) Abstract No.: 76-63652X/34, German Patent No. DE 2456432, Aug. 12, 1976.
WPI (Derwent) Abstract No.: 75-56321W/34, Japanese Patent No. JP 50020084, Mar. 3, 1975.
WIP (Derwent) Abstract No.: 81-46866D/26, Japanese Patent No. JP 56053158, May 12, 1981.

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