Abstract: 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.

Abstract: The invention is an article and method of discretely recording confidential information especially for lottery applications and comprises: providing a substrate assembly comprising a) a substrate, b) a first layer of an acid developer material coated on the substrate, c) a meltable barrier layer applied over the acidic developer material, the meltable barrier layer being meltable in response to the applied heat of a thermal printhead or laser, d) a scratch-off layer coated over the meltable barrier layer, and e) pressure-sensitive microcapsules containing a dye precursor and solvent dispersed in any of the layers and, recording non-visible information by selective application of heat to the substrate assembly using a thermal printhead or laser, the barrier layer being “activated” by melting in discrete areas where heat is selectively applied from the thermal printhead or laser.

Abstract: Disclosed is a security token that contains a magnetic information in registration with thermally generated information. Also disclosed are numerous security and authentication methods made possible using such token.

Abstract: A novel thermally responsive record material is disclosed, comprising support having provided thereon in substantially contiguous relationship with electron donating dye precursor, an acidic developer material, a sensitizer, and a binder therefor. The sensitizer comprises at least two components, the first component comprising 2,2-bis(4-hydroxyphenyl)-4-methylpentane and the second component comprising a mixture of dimethyl terephthalate and 1,2-diphenoxyethane, the first component being in a range of weight ratios from 1:2 to 2:1 relative the second component, said second component comprising from 50 to 70% dimethyl terephthalate. The sensitizer is prepared by admixing the first component and the second component and grinding the sensitizer to a particle size of less than 1 micron.

Abstract: A novel thermally-responsive record material is disclosed comprising a support having provided thereon in substantially contiguous relationship an election donating dye precursor and a compound of the formula ##STR1##