Bleed alleviation using pH-sensitive dyes

Details Bleed alleviation using pH-sensitive dyes Bleed alleviation using pH-sensitive dyes

1991-09-23

1993-01-19

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

106 22D, 106 22K, 346140R, B41J 221, C09D 1102

Patent

active

051810450

ABSTRACT:
Certain dyes become insoluble under specific and well-defined pH conditions. By forcing a dye to become insoluble on the page, migration of the dye is inhibited, thereby helping to reduce bleed between inks of different colors. The dye 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).

REFERENCES:
patent: 3889271 (1975-06-01), Freytag
patent: 4533920 (1985-08-01), Suzuki
patent: 4963189 (1990-10-01), Hindagolla
patent: 5062893 (1991-11-01), Adamic
patent: 5106416 (1992-04-01), Moffatt

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