Tamper-indicating sheet
First Claim
1. In a thermally-sensitive blush coating comprised of a mass of light-scattering, polymeric particles which are adapted to coalesce to a more compact coating on application of heat thereto, the improvement wherein said mass of particles is in intimate contact with a minor amount of a binder composition which, on exposure to any of a wide spectrum of aromatic or aliphatic solvents, will form means to substantially impair the light-scattering character of said mass of polymeric particles and transform said mass of particles into a more compact, normally translucent, coating.
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Accused Products
Abstract
A novel lottery ticket comprising a blush-type coating which coating is characterized by susceptibility to a change in appearance when exposed to either (a) any of a wide spectrum of organic solvents or (b) an elevated temperature. Such susceptibility reveals that solvent or thermal techniques have been used in tampering with the ticket or a pouch package in which the ticket is held. Such tampering is often the result of an illicit attempt to obtain information about the indicia printed on the ticket.
57 Citations
23 Claims
- 1. In a thermally-sensitive blush coating comprised of a mass of light-scattering, polymeric particles which are adapted to coalesce to a more compact coating on application of heat thereto, the improvement wherein said mass of particles is in intimate contact with a minor amount of a binder composition which, on exposure to any of a wide spectrum of aromatic or aliphatic solvents, will form means to substantially impair the light-scattering character of said mass of polymeric particles and transform said mass of particles into a more compact, normally translucent, coating.
- 7. A lottery ticket comprising, as an integral portion thereof, a means for detecting thermal and solvent tampering with said ticket, a blush coating comprised of a mass of light-scattering, polymeric particles which are adapted to coalesce to a more compact coating on application of heat thereto, the improvement wherein said mass of particles is in intimate contact with a minor amount of a binder composition which, on exposure to any of a wide spectrum of aromatic or aliphatic solvents, will form means to substantially impair the light-scattering character of said mass of polymeric particles and transform said mass of particles into a more compact, normally translucent, coating.
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17. In a pouch formed of a sheet material comprising (a) polymer-based cohesive seal and (b) a polymer-based coating formed of small thermoplastic polymeric particles deposited in intimate contact with another within said pouch-forming sheet material, and wherein the appearance of said based coating is irreversibly and substantially changed by subjecting said polymeric particles to temperatures of at least 140°
- F.
the improvement wherein said polymer-based coating comprises a binder composition with a solvent-leachable plasticizer component forming means to accelerate said change in appearance. - View Dependent Claims (18, 19, 20, 21, 22, 23)
- F.
Specification