Colorants, colorant stabilizers, ink compositions, and improved methods of making the same
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United States of America Patent
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Feb 25, 2003
Grant Date -
Oct 25, 2001
app pub date -
Jan 12, 2001
filing date -
Aug 15, 1997
priority date (Note) -
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Abstract
The present invention relates to a family of new porphine compounds for use as colorants and/or colorant stabilizers. The new porphine compounds may be used alone or may be used in combination with one or more colorants to provide light stability to colorants. The present invention further relates to inks containing the new porphine compounds and a method for making the new compounds. The present invention also relates to improved methods of making porphines. The improved processes allow the production of porphines at lower cost and higher yields compared to conventional methods of making porphines.
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