Protected activators for use in leuco dye compositions
AssigneeHewlett-Packard Development Company, L.P.
InventorMakarand P. Gore
Life of this patent
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Abstract
Compositions and methods for production of color images using leuco dye-containing color forming compositions are described. The color forming composition can include a color forming leuco dye, an activator having at least one acid group which can be protected by a protection leaving group; and a deprotecting agent configured for removing the protection leaving group upon application of energy in the form of heat or light.
Claims33
A color forming composition, comprising:
- a) a color forming leuco dye;
- b) an activator having at least one acid group, said at least one acid group being protected by a protection leaving group to form a protected activator;
- and
- c) a deprotecting agent configured for removing the protection leaving group from the activator upon application of energy.
An optical disk, comprising an optical disk substrate having a color forming composition coated thereon, said color forming composition comprising:
- a) a color forming leuco dye;
- b) an activator having at least one acid group, said at least one acid group being protected by a protection leaving group to form a protected activator;
- and
- c) a deprotecting agent configured for removing the protection leaving group from the activator upon application of energy.
A method for preparing color forming compositions, comprising:
- a) attaching a protection leaving group to an acid-containing activator to form a protected activator;
- and
- b) combining the protected activator with a color forming leuco dye and a deprotecting agent configured for removing the protection leaving group from the activator upon application of energy.
A method of forming color images on a substrate, comprising:
- a) applying a color forming composition onto a substrate, said color forming composition including:
- i) a color forming leuco dye;
- ii) an activator having at least one acid group, said at least one acid group being protected by a protection leaving group;
- and
- iii) a deprotecting agent configured for removing the protection leaving group from the activator upon application of heat;
- and
- b) applying heat sufficient to remove the protection leaving group without decomposing the color forming composition.
Dependencies are inferred from the claim text.