Bleed alleviation using pH-sensitive agents
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United States of America Patent
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Jun 14, 1994
Issued Date -
N/A
app pub date -
Jan 19, 1993
filing date -
Sep 23, 1991
priority date (Note) -
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Abstract
Certain colorants become insoluble under specific and well-defined pH conditions. By forcing a colorant to become insoluble on the page, migration of the colorant is inhibited, thereby helping to reduce bleed between inks of different colors. The colorant is forced out of solution from the ink by contact with another ink having the appropriate pH (either higher or lower than that of the first ink). In particular, an ink containing a colorant comprising a pigment in combination with a pH sensitive dispersant is used in conjunction with an ink of the appropriate pH.
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