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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Apr 9, 2002
Grant Date -
N/A
app pub date -
Jan 19, 2000
filing date -
Jan 19, 1999
priority date (Note) -
Expired
status (Latency 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 as a magenta dye 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 Cu-meso-tetra-(2-sulfanatophenyl)-porphine (designated o-CuTPPS4). The improved processes allow the production of o-CuTPPS4 at lower cost and higher yields compared to conventional methods of making o-CuTPPS4. The present invention further relates to the use of o-CuTPPS4 as a colorant stabilizer for a variety of colorants, especially magenta colorants. The o-CuTPPS4, according to the present invention, provides a more stable and more 'blue' colorant stabilizer compared to known colorant stabilizers, such as Cu-meso-tetra-(p-phenylcarboxylic acid)-porphine.
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