Image forming process and image forming apparatus and ink...

Details Image forming process and image forming apparatus and ink... Image forming process and image forming apparatus and ink...

2005-09-20

2008-09-23

Shah, Manish S. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

C106S031130, C106S031270, C106S031600, C347S095000, C347S096000

Reexamination Certificate

active

07427130

ABSTRACT:
An image is formed by applying a recording composition having a colorant and a treating composition including a component that reacts with colorant droplets so that the compositions contact and mix with each other on a recording medium; and adjusting the pH of the mixture so that the treating composition and the recording composition react to form aggregates while any unreacted component forms aggregates as a simple substance, wherein the component that reacts with the colorant has an isoelectric point at which the zeta potential (ζ) is 0 when zeta potential (ζ) change of the component is plotted versus corresponding changes in the pH of the mixture, and wherein the recording composition and treating composition are respectively adjusted to satisfy a<γ and a<c, wherein “c” is a pH value of the isoelectric point, “a” is a pH value of the mixture where the zeta potential (ζ) change according to pH is on the more acidic side than the pH (c) of the isoelectric point, and is about −2.5 mV·l/mol, and “γ” is the pH of the mixture.

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