Performance adhesive for security documents
OwnerNancy J. Gettens, Gerald Nkwantah +2inventors
InventorsNancy J. Gettens, Gerald Nkwantah, Jeffrey Scot Royal, Michael McAllister
Life of this patent
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Abstract
An adhesive suitable for use in security documents (for example, currency, passports, tickets, etc.) includes a plurality of polymers, that collectively exhibit tackification, resistance to aqueous agents, and solvent resistance, and a cross-linker selected to be activated to chemically react with one or more polymers of the plurality of polymers, at a temperature in a predetermined range of temperatures.
Claims95
An adhesive, comprising:
- a plurality of polymers, that collectively exhibit tackification, resistance to aqueous agents, and solvent resistance;
- and
- a cross-linker selected to be activated to chemically react with one or more polymers of the plurality of polymers, at a temperature in a predetermined range of temperatures.
A security document, comprising:
- a paper substrate;
- a security device;
- and
- an adhesive layer comprising an adhesive, the adhesive layer providing a bond between the security device and the paper substrate,
- wherein the adhesive comprises a plurality of polymers, that collectively exhibit tackification, resistance to aqueous agents, and solvent resistance, and a cross-linker selected to be activated to chemically react with one or more polymers of the plurality of polymers, at a temperature in a predetermined range of temperatures.
A method of making a security document, the method comprising:
- at a paper machine configured to pass a substrate containing water through one or more processing sections, introducing an adhesive to create an adhesive layer, the adhesive comprising a plurality of polymers that collectively exhibit tackification, resistance to aqueous agents, and solvent resistance, and a cross-linker selected to be activated to chemically react with one or more polymers of the plurality of polymers, at a temperature in a predetermined range of temperatures;
- positioning a security device on a first portion of the substrate to which the adhesive has been introduced;
- and
- passing the first portion of the substrate to a processing section of the paper machine at the temperature in the predetermined range of temperatures to activate the cross-linker to chemically react with one or more polymers of the plurality of polymers,
- wherein the adhesive is introduced to the substrate at a processing section of the paper machine where the substrate contains sufficient water to activate a polymer of the plurality of polymers that exhibits tackification, to provide wet tack.
A security device, comprising:
- an authentication structure;
- and
- an adhesive layer comprising an adhesive, the adhesive layer providing a bond between the security device and a substrate,
- wherein the adhesive comprises a plurality of polymers, that collectively exhibit tackification, resistance to aqueous agents, solvent resistance, and a cross-linker selected to be activated to chemically react with one or more polymers of the plurality of polymers, at a temperature in a predetermined range of temperatures.
Dependencies are inferred from the claim text.