Subphthalocyanine colorants, ink compositions, and method of making the same
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
May 12, 2000
filing date -
May 24, 1999
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Expired
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Abstract
The present invention is directed to methods of making subphthalocyanine compounds. The methods of the present invention may be used to produce known subphthalocyanine compounds, as well as, a new family of subphthalocyanine compounds. The methods of the present invention may employ environmentally-friendly solvents, which donate a hydrogen atom for use in the reaction mechanism. The methods of the present invention produce subphthalocyanine compounds at a yield of greater than about 50%, and even greater than about 94%. The present invention is further directed to subphthalocyanine compounds having improved lightfastness. The subphthalocyanine compounds may have a Subphth-Lightfastness Test Value of less than 15%.
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