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Colorant stabilizers
| Details |
Inventors: Nohr, Ronald Sinclair; MacDonald, John Gavin;
Assignee:
Primary Examiner: Klemanski; Helene
Assistant Examiner:
Attorney, Agent or Firm: Jones & Askew, LLP
The present invention comprises colorant stabilizers and a colorant composition which includes a colorant and a colorant stabilizer. The colorant stabilizer imparts light-stability to the colorant so that the colorant does not fade when exposed to electromagnetic radiation such as sunlight or artificial light. |
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DETAILED DESCRIPTION OF THE INVENTION This application is directed to compositions and methods for stabilizing colorants against radiation including radiation in the visible wavelength range.
The compositions and methods relating to stabilizing a colorant by admixing a stabilizing molecule with a colorant solution will first be addressed below.
Subsequently, the compositions and methods relating to stabilizing a colorant by applying the colorant to a treated substrate containing a stabilizing molecule will be discussed.
Admixing Stabilizing Molecules Into Colorant Solutions.
The present invention relates to colorant compositions having improved stability, wherein the colorant stabilizer is associated with a colorant solution.
Desirably, the colorant stabilizer is admixed with a colorant solution.
The colorant stabilizer is desirably an aryliminealkene compound.
Other desired colorant stabilizers are heavy atoms such as the iodide ion and phenol derivatives such as triiodophenol, trimethylphenol, and derivatives thereof.
Additional colorant stabilizers include reducing agents such as sodium thiosulfate.
The colorant stabilizers of the present invention are admixed with a colorant to stabilize the colorant when the admixture is exposed to electromagnetic radiation such as artificial light or sunlight.
The present invention further relates to a method of stabilizing a colorant comprising associating one or more of the colorant stabilizers with the colorant solution.
Optionally, the colorant stabilizer may be associated with a molecular includant.
The present invention is particularly useful for stabilizing inks to be used in ink jet printers.
Inks used in ink jet printers are described in U.
S.
patent application Ser.
No.
08/461,365 filed n Jun.
5, 1995, which is incorporated herein by reference.
Thus, in one embodiment, the aryliminealkene stabilizing composition is shown by the following general formula: ##STR3## wherein R.
sub.
1 is hydrogen, an alkyl, alkenyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl group, or substituted aryl group; R
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