THERMALLY IMAGEABLE SUBSTRATE WITH ENCAPSULATED COREACTANT
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United States of America Patent
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May 24, 2016
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May 24, 2016
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A substrate thermal sensitive system for creating a latent image that is useful as a scratch-off ticket that comprises a substrate and a first layer that is superimposed on the substrate. The first layer contains a plurality of microcapsules with a dye precursor or a solvent. The microcapsules are configured to rupture from pressure. The substrate thermal sensitive system further has an acidic developer layer coated over the first layer and containing a co-reactant. Particles of the co-reactant are coated with a meltable material, which is configured to melt when the heat is applied. The system further may include a scratch-off layer coated over the acidic developer layer. The system is configured such that when the meltable material is melted by the thermal printing device and the microcapsules are ruptured, the co-reactant of acidic developer layer reacts with the dye or the solvent of the first layer to develop color.
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