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US 7,582,398 B2Granted
Inkless reimageable printing paper and method
AssigneeXerox Corporation
InventorsGabriel Iftime, Peter M. Kazmaier, Tyler B. Norsten
Life of this patent
Estimating the term…
Abstract
An image forming medium includes a substrate and an imaging layer coated on or impregnated into the substrate, where the imaging layer includes a photobase generator and a coupling agent. In the image forming medium, irradiation of the imaging layer cause the photobase generator to generate a base that reacts with the coupling agent to produce an image.
Claims24
An image forming medium, comprising
- a substrate;
- and
- an imaging layer coated on or impregnated into said substrate, the imaging layer comprising:
- a photobase generator,
- a coupling agent, and
- a photoacid generator,
- wherein:
- the photobase generator and the coupling agent are selected so that irradiation of the imaging layer with light of a first wavelength causes said photobase generator to generate a base that reacts with the coupling agent to produce an extended conjugation that forms an image,
- the photoacid generator is selected so that irradiation of the imaging layer with light of a second wavelength causes said photoacid generator to generate an acid that reacts with the extended conjugation to reverse formation of the extended conjugation to erase the image, and
- the first wavelength is different from the second wavelength.
7 more elements
A method of making an image forming medium, comprising applying an imaging layer composition to a substrate,
- wherein:
- the imaging layer composition comprises:
- a photobase generator,
- a coupling agent, and
- a photoacid generator,
- wherein:
- the photobase generator and the coupling agent are selected so that irradiation of the imaging layer with light of a first wavelength causes said photobase generator to generate a base that reacts with the coupling agent to produce an extended conjugation that forms an image,
- the photoacid generator is selected so that irradiation of the imaging layer with light of a second wavelength causes said photoacid generator to generate an acid that reacts with the extended conjugation to reverse formation of the extended conjugation to erase the image, and
- the first wavelength is different from the second wavelength.
6 more elements
A method of forming an image, comprising:
- providing an image forming medium comprising:
- a substrate;
- and
- an imaging layer coated on or impregnated into said substrate, wherein the imaging layer comprises a photobase generator, a coupling agent, and a photoacid generator;
- forming an image by exposing the image forming medium to UV irradiation of a first wavelength in an imagewise manner, and
- erasing the image by exposing the image forming medium bearing the image to UV irradiation of a second wavelength in an imagewise manner,
- wherein:
- said UV irradiation of the first wavelength causes said photobase generator to generate a base that reacts with the coupling agent to produce an extended conjugation that forms the image, and
- said UV irradiation of the second wavelength causes said photoacid generator to generate an acid that reacts with the extended conjugation to reverse formation of the extended conjugation to erase the image.
6 more elements
Dependencies are inferred from the claim text.