Processes of purifying a dispersion and making inkjet inks

Details Processes of purifying a dispersion and making inkjet inks Processes of purifying a dispersion and making inkjet inks

1999-01-29

2001-12-11

Lovering, Richard D. (Department: 1712)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C106S031650, C204S520000, C204S522000, C210S650000, C210S651000, C210S652000, C210S663000, C210S669000, C210S787000, C516S032000, C516S034000, C516S038000, C516S081000, C516S090000, C516S921000

Reexamination Certificate

active

06328894

ABSTRACT:

BACKGROUND OF THE INVENTION
1.Field of the Invention
The present invention relates to purification and classification methods, and more particularly relates to the purification and classification of dispersions containing colloidal particles.
2. Description of the Art
In processes which form stabilized colloidal particles (e.g., carbon black having attached an organic group containing at least one ionic group or one ionizable group), free species can co-exist in a dispersion. While such dispersions can be used in subsequent end uses such as in inks or paints and especially inkjet inks, it is desirable to remove impurities like free species from the dispersion since a purified dispersion can improve properties in the desired end product application.
Accordingly, it is desirable to develop processes which permit the purification and classification of dispersions containing stabilized colloidal particles and free species.
SUMMARY OF THE INVENTION
A feature of the present invention is to provide a process to purify a dispersion containing free species by removing or replacing the species.
Another feature of the present invention is to provide a process for purifying a dispersion of stabilized colloidal particles, like modified carbon products having attached at least one organic group with an ionic group and/or ionizable group. An additional feature is to classify or separate the stabilized colloidal particles from large, coarse or undertreated colloidal particles.
Additional features and advantages of the present invention will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.
To achieve these and other advantages and in accordance with the purpose of the present invention as embodied and broadly described herein, the present invention relates to a process to purify a dispersion comprising stabilized colloidal particles having cations and anions with free species in solution. In particular, the present invention relates to three primary steps in purifying a dispersion comprising stabilized colloidal particles. The three steps involve the removal or classification of particles above a certain size, the removal of free species from the dispersion, and an optional counter-ion exchange of counterions that are a part of the stabilized colloidal particles. In further detail, and as an example, the process includes the steps of substantially removing particles having a particle size above about 1 micron, and preferably above 0.5 micron. The process further includes the step or steps of substantially removing the free species and optionally exchanging at least a portion of the counterions that form a part of the stabilized colloidal particles with a different counterion or counterions. In addition, the process of the present invention can be tailored to vary or achieve a particular average particle size in order to alter the desired properties in the end product application, as well as tailor the number of colloidal particles having a size greater than about 0.5 micron.
The present invention additionally relates to a process to purify a dispersion comprising modified carbon products having attached at least one organic group, wherein at least one organic group comprises at least one ionic group, at least one ionizable group, or a mixture thereof and free species in solution. The steps of purifying would be the same as described above.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the present invention, as claimed.


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