Printed matter

Details Printed matter Printed matter

1994-01-11

1995-05-16

Fridie, Willmon

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing chemical

B42D 1500

Patent

active

054154340

ABSTRACT:
A printed matter is printed by a ink containing a color coupler that is chromatized from a substantially invisible colorless state to a colored state by means of a color coupling additive applied by an applicator. The color coupler is at least one electron donative coloring compound selected from a group A composed of crystal violet lactone; malachite green lactone; 1.3-dimethyl-6-diethylaminofluoran; 6-diethylamino-benzo[.alpha.]-fluoran; 3-cyclohexyl methylamino-6-methyl-7-anilinofluoran; benzoyl leucomethylene blue; ethyl leucomethylene blue; methoxybenzoyl leucomethylene blue; 2-(phenylimino ethanedilidene)-3.3-trimethyl-indoline; 1.3.3-trimethyl-indolino-7'-chloro-.beta.-naphthospiropyran; di-.beta.-naphthospiropyran; N-acetylauramine; N-phenylauramine; and rhodamine B lactam. The color coupling additive is at least one electron acceptive developing compound selected from a group B composed of zinc salicylate, bisphenol A and inorganic and organic acids.

REFERENCES:
patent: 3638335 (1972-02-01), Gundensen et al.
patent: 3682673 (1972-08-01), Manske
patent: 4852912 (1989-08-01), Engel
patent: 5139572 (1992-08-01), Kawashima
patent: 5188871 (1993-02-01), Collings
patent: 5282651 (1994-02-01), Alonso

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