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Protected activators for use in leuco dye compositions

a technology of activater and leuco dye, which is applied in the field of leuco dye compositions, can solve the problems of affecting the performance of the disk upon spinning at high speed, unable to meet the requirements of practical use, and the compositions are not stable under ambient light conditions. to achieve the effect of rapid developmen

Inactive Publication Date: 2005-10-13
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] It has been recognized that it would be advantageous to provide rapidly developable and light stable color forming compositions which are suitable for use in labeling substrates.

Problems solved by technology

While this method can provide a wide variety of label content, it tends to be cost ineffective for production of less than about 400 disks because of the fixed costs associated with preparing a stencil or combination of stencils and printing the desired pattern or graphic display.
Most consumer available methods of labeling are limited to either handwritten descriptions or preprinted labels which may be affixed to the disk, but which can also adversely affect the disk performance upon spinning at high speeds.
However, many of these compositions are insufficiently stable under ambient light conditions for practical use.

Method used

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  • Protected activators for use in leuco dye compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] A dispersion of 20 wt % flouran dye S-205, 0.5 wt % IR780 absorber (Aldrich), 10 wt % 2-hydroxy-1-amino-propanol, 25 wt % acetyl TG-SA (protected activator), 20 wt % cellulose butyl acetate as a binder, and 0.1 wt % IR 780 with the balance being methylethyl ketone was prepared. The color forming solution was applied to a glass substrate and dried under vacuum to form a film. Heat was then applied using a laser at about 45 mW power for about 100 microseconds. The following reaction resulted in an intense black color having an optical density greater than 1.0. A reaction scheme depicting the color forming components is shown as follows:

example 2

[0075] A dispersion of 20 wt % flouran dye S-205, 10 wt % 2-hydroxy-1-amino-propanol, 25 wt % acetyl TG-SA (protected activator), 45 wt % CDG000 UV curable binder available from Norcote Inc. was prepared. The color forming dispersion was applied to a glass substrate and cured using UV radiation. Heat was then applied using a laser at about 45 mW power for about 100 microseconds. A similar reaction as shown in Example 1 resulted in an intense black color having an optical density of less than 1.0.

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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.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to leuco dye compositions. More particularly, the present invention relates to leuco dye compositions for use in forming color images. BACKGROUND OF THE INVENTION [0002] Compositions which produce a color change upon exposure to light or heat are of great interest in producing images on a variety of substrates. Optical disks represent a significant percentage of the market for data storage of software as well as of photographic, video, and / or audio data. Typically, optical disks have data patterns embedded thereon that can be read from one side of the disk, and a graphic display printed on the other side of the disk. [0003] In order to identify the contents of the optical disk, printed patterns or graphic display information can be provided on the non-data side of the disk. The patterns or graphic display can be both decorative and provide pertinent information about the data content of the disk. In the past, comm...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41M5/333B41M5/337G11B7/244G11B7/246G11B7/251
CPCB41M5/3333B41M5/3335B41M5/3375Y10T428/21G11B7/246G11B7/251G11B7/244
Inventor GORE, MAKARAND P.
Owner HEWLETT PACKARD DEV CO LP
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