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US 7,029,525 B1Granted
Optically variable water-based inks
AssigneeThe Standard Register Company
InventorRajendra Mehta
Life of this patent
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Abstract
Optically variable water-based inks, methods of providing security information, and documents are provided. The optically variable water-based inks are suitable for flexographic printing processes, and the optically variable water-based inks display a viewing angle dependent color shift between at least a first color and at least a second color. The optically variable water-based inks may be used to provide security information and to flexographically print documents.
Claims10
A method of providing security information, comprising:
- providing a water-based ink comprising:
- about 5 to about 50 percent by weight of at least one optically variable pigment;
- at least one binder;
- and
- water;
- printing at least a portion of a substrate with said water-based ink utilizing flexographic printing, wherein:
- said portion of said substrate printed with said water-based ink displays a viewing angle dependent color shift between at least a first color and a second color;
- said portion of said substrate printed with said water-based ink comprises security information;
- and said security information is not reproducible via photocopying;
- and
- printing said substrate utilizing laser printing subsequent to printing at least a portion of said substrate with said water-based ink wherein said security information remains intact during said laser printing.
8 more elements
Dependencies are inferred from the claim text.