Coatings for use with business forms, security documents, or safety paper
First Claim
1. A business form comprising:
- at least one substrate having a first and second major surface, and having a self-contained coating composition on at least a portion of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which si stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said self-contained coating composition being adapted to release said solvent form said microcapsules upon the impact of the imaging device, to permit reaction of said color former and said color developer to form a visible color.
5 Assignments
0 Petitions
Accused Products
Abstract
Carbonless coating compositions which can be printed onto one or more sheets of a business form or mailer to provide a visible image which is sharper and darker than previous coatings are provided. The compositions also find use on security documents and safety papers to provide a covert image on the document beneath information which may be subject to attempted alteration, such as the amount written on a check. The covert image becomes visible upon the application of pressure or solvent in the area coated to provide evidence of the attempted alteration. The self-contained composition includes an admixture of a color former, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent. Another solvent-sensitive composition includes an admixture of a color former and a color developer.
59 Citations
25 Claims
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1. A business form comprising:
at least one substrate having a first and second major surface, and having a self-contained coating composition on at least a portion of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which si stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, said self-contained coating composition being adapted to release said solvent form said microcapsules upon the impact of the imaging device, to permit reaction of said color former and said color developer to form a visible color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- 14. A method for forming visible images on a business form having a first and a second major surface and having a self-contained coating composition on at least a protein of one of said major surfaces, said self-contained coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a color developer, and a plurality of pressure-rupturable microcapsules containing a solvent, which comprises the step of containing said surface of said business form with an imaging device thereby providing a visible image in said self-contained coating composition by rupturing said microcapsules to release said solvent causing reaction of said color former with said color developer.
- 19. A business form comprising at least one substrate having a first and second major surface and having a coating composition on at least a portion of one of said major surfaces, said coating composition comprising an admixture of a color former which is stabilized with a complexing agent to prevent premature coloration, a micro encapsulated solvent and a color developer, said color former and said color developer being adapted to reactively combine to form a visible color upon contact by said solvent.
Specification