Self-dispersing pigment and process of making and use of same

Details Self-dispersing pigment and process of making and use of same Self-dispersing pigment and process of making and use of same

C - Chemistry, Metallurgy

09

C

C09C 1/56 (2006.01) C09B 67/00 (2006.01)

Patent

CA 2407498

A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3µmoles/M2. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.

L'invention concerne un procédé dans lequel un pigment est oxydé à l'ozone dans un environnement aqueux dans lequel le mélange d'ozone, d'eau et de pigment est soumis à une opération de mélange dispersif ; et/ou le pH du mélange est maintenu dans une plage de 6-8, le pigment étant auto-dispersant et possèdant, de préférence, une valeur acide inférieure à 3 mu moles/M<2>. Les pigments fabriqués selon ledit procédé et des encres pour jet d'encre contenant lesdits pigments auto-dispersants, sont également décrits.

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