Security jet ink
AssigneeVideojet Systems International, Inc.
InventorsSherry L. Nelson, Bruce A. Lent
Life of this patent
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Abstract
A latent image printing process comprising applying to a substrate a latent image ink composition, with an ink jet printer. Subsequently, the latent image is activated to render it visible, by application of an activator. The present invention also provides a latent ink composition for use in ink jet applications, which is capable of being applied to a white or light colored substrate to form latent printed images that are substantially invisible until activated.
Claims16
A latent image ink composition for use in ink jet printing comprising:
- a. zinc chloride as a latent image forming agent;
- and
- b. a carrier;
- said composition having (1) a viscosity from about 1.6 to about 7.0 centipoises at 25.degree. C.;
- (2) an electrical resistivity from about 50 to about 2000 ohm-cm;
- and (3) a sonic velocity from about 1200 to about 1300 meters/second;
- and
- said composition being substantially invisible when printed upon a white or light colored substrate.
A method of printing a latent image on a substrate, comprising ink jet printing onto said substrate a latent image ink composition, said composition comprising:
- a. zinc chloride as a latent image forming agent;
- and
- b. a carrier;
- said composition having (1) a viscosity from about 1.6 to about 7.0 centipoises at 25.degree. C.;
- (2) an electrical resistivity from about 50 to about 2000 ohm-cm;
- and (3) a sonic velocity from about 1200 to about 1300 meters/second;
- and
- said composition being substantially invisible when printed upon a white or light colored substrate.
Dependencies are inferred from the claim text.