Bleed alleviation using pH-sensitive agents

Details Bleed alleviation using pH-sensitive agents Bleed alleviation using pH-sensitive agents

1993-01-19

1994-06-14

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 23R, C09D 1102

Patent

active

053206681

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.

REFERENCES:
patent: 4963189 (1990-10-01), Hindagolla
patent: 5106416 (1992-04-01), Moffatt et al.
patent: 5160372 (1992-11-01), Matrick
patent: 5181045 (1993-01-01), Shields et al.
patent: 5196056 (1993-03-01), Prasad

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