Solvent and/or pressure sensitive security document
AssigneeThe Standard Register Company
InventorsMark D. Dotson, A. Dale Lakes, William H. Mowry, Jr.
Life of this patent
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Abstract
A document is provided having a solvent sensitive and/or pressure sensitive ink printed thereon which reacts to the application of a solvent and/or pressure to form a visible stain or image. The ink includes a first composition of solvent soluble, water insoluble dye particles, a binder, and optionally, an opacifier. Alternatively, the first composition may be combined with a second composition which includes an encapsulated solvent and optionally a stilting material. The first and second compositions may be printed on the document in separate steps or printed together as a self-contained composition. The ink may be printed on the entire surface of the document or only on selected areas thereof.
Claims31
A solvent sensitive security document comprising a document substrate having a first and second major surfaces, at least one of said major surfaces having coated or printed thereon a composition comprising solvent soluble, water insoluble dye particles having a diameter of between about 0.3-50 .mu.m, and a binder, said dye particles solubilizing when contacted with a solvent to form a colored visible stain or image on said substrate to indicate an attempted alteration of said document.
A solvent and pressure sensitive document comprising:
- a document substrate having first and second major surfaces;
- a first composition comprising solvent soluble, water insoluble dye particles having a diameter of between about 0.3-50 .mu.m, and a binder, said first composition being printed or coated on a selected portion of one of said major surfaces of said document substrate;
- and
- a second composition comprising an encapsulated solvent for said dye particles printed on said first coating in an overlapping relationship;
- whereby the application of a solvent or pressure to the area of said document containing said first and second compositions produces a colored visible stain or image thereon.
A solvent and pressure sensitive document comprising:
- a document substrate having first and second major surfaces;
- a composition printed or coated on a selected portion of one of said major surfaces, said composition comprising solvent soluble, water insoluble dye particles having a diameter of between about 0.3-50 .mu.m, and a binder, and an encapsulated solvent;
- whereby the application of a solvent or pressure to the area of said document containing said coating produces a colored visible stain or image thereon.
A solvent and pressure sensitive document comprising:
- a document substrate having first and second major surfaces;
- a first coating composition comprising covert, solvent soluble, water insoluble dye particles having a diameter of between about 0.3-50 .mu.m, and a binder, said composition deposited on the entire surface of at least one of said major surfaces of said document substrate;
- a second coating composition comprising an encapsulated solvent and a stilting material, said composition deposited on a selected portion of said first coating;
- whereby the application of a solvent to any portion of the surface of said document substrate produces a colored visible stain or image thereon and wherein the application of pressure or a solvent to the portion of said document substrate containing both said first and second coatings produces a colored visible stain or image.
Dependencies are inferred from the claim text.