 Method for the preparation of planographic printing plates |
| OF THE PREFERRED EMBODIMENTS As is understood from the above given description, the method of the ... |
|
| Image forming materials and image forming process |
| OF THE INVENTION Examples of Ge--S compositions which can be used in the present invention are GeS,... |
|
| Peak detector circuit |
| What is claimed is: 1. A peak detector circuit for detecting the maximum excursion of an amplitude ... |
|
| Method of depositing thin films of small dimensions utilizing silicon nitride lift-off mask |
| Accordingly, it is a primary object of the invention to provide an improved tear-free thin film ... |
|
| Photosensitive image forming material and an image forming method using same |
| OF THE INVENTION The support material used in the present invention supports the poly(vinyl ... |
|
| Lighting system |
| A lighting system which includes a cathode for emitting electrons from an external surface thereof. ... |
|
| Electroluminescent device with silazane-containing luminescent zone |
| Although recent performance improvements in organic EL devices have suggested a potential for ... |
|
| Electroluminescent element |
| The present invention was designed to eliminate the above-mentioned disadvantages found in the ... |
|
| Electroluminescent element |
| It is an object of the present invention to provide electroluminescent elements which permit the ... |
|
| Electroluminescent element |
| What is claimed is: 1. An electroluminescent element comprising an organic electroluminescent ... |
|
|
Digital information recording media and method of using same
| Details |
Inventors: Nohr, Ronald Sinclair; MacDonald, John Gavin;
Assignee: Kimberly-Clark Corporation (Neenah, WI)
Primary Examiner: McPherson; John A.
Assistant Examiner:
Attorney, Agent or Firm: Jones & Askew
A digital information recording media which includes a recording layer comprising a light-stable colored composition which composition is mutable or decolorizable upon exposure to a specific wavelength of ultraviolet radiation. The light-stable colored composition includes a colorant and an ultraviolet radiation transorber. The colorant, in the presence of the radiation transorber, is adapted, upon exposure of the transorber to specific, narrow bandwidth ultraviolet radiation, to be mutable. The radiation transorber also imparts light-stability to the colorant so that the colorant does not fade when exposed to sunlight or artificial light. The ultraviolet radiation transorber is adapted to absorb radiation and interact with the colorant to effect the irreversible mutation of the colorant. Especially useful radiation is incoherent, pulsed ultraviolet radiation produced by a dielectric barrier discharge excimer lamp or coherent, pulse radiation produced by an excimer laser. In another embodiment, the colored composition which comprises a colorant and an ultraviolet radiation transorber may also contain a molecular includant having a chemical structure which defines at least one cavity. Each of the colorant and radiation transorber is associated with the molecular includant. In some embodiments, the colorant is at least partially included within a cavity of the molecular includant and the ultraviolet radiation transorber is associated with the molecular includant outside of the cavity. In other embodiments, the radiation transorber is covalently coupled to the molecular includant. |
|
DETAILED DESCRIPTION OF THE INVENTION The present invention relates in general to a light-stable colorant system that is mutable by exposure to narrow band-width ultraviolet radiation and to a recording medium employing such a colorant system.
The present invention more particularly relates to a composition comprising a colorant which, in the presence of a radiation transorber, is stable under ordinary light but is mutable when exposed to specific, narrow band-width radiation.
The radiation transorber is capable of absorbing radiation and interacting with the colorant to effect a mutation of the colorant.
The radiation transorber may be any material which is adapted to absorb radiation and interact with the colorant to effect the mutation of the colorant.
Generally, the radiation transorber contains a photoreactor and a wavelength-specific sensitizer.
The wavelength-specific sensitizer generally absorbs radiation having a specific wavelength, and therefore a specific amount of energy, and transfers the energy to the photoreactor.
It is desirable that the mutation of the colorant be irreversible.
The present invention also relates to colorant compositions having improved stability, wherein the colorant is associated with a modified photoreactor.
It has been determined that conventional photoreactors which normally contain a carbonyl group with a functional group on the carbon alpha to the carbonyl group acquire the ability to stabilize colorants when the functional group on the alpha carbon is removed.
Accordingly, the present invention also includes a novel method of dehydrating photoreactors that have a hydroxyl group in the alpha position to a carbonyl group.
This reaction is necessary to impart the colorant stabilizing capability to the photoreactor.
The novel method of dehydrating photoreactors that have a hydroxyl group in the alpha position to a carbonyl group can be used with a wide variety of photoreactors to provide the colorant stabilizing capability to the photoreactor.
The resulting modified photoreactor can optionally be linked to wavelength-selective sensitizer to impart the capability of decolorizing a colorant when exposed to a predetermined narrow wavelength of electromagnetic radiation
|
|
Manufacturing Materials 
