MAGNETIC ACTUATED-MILLED PIGMENT DISPERSIONS AND PROCESS FOR MAKING THEREOF

摘要

The disclosure provides pigment dispersions having an average particle size of from about 10 nm to about 500 nm prepared by employing a magnetic actuated milling process and system. In embodiments, the pigment dispersions have an average particle size of less than 100 nm.

主权项

1. A method for producing a milled pigment dispersed in aqueous media, the method comprising:
mixing a pigment with water for a period of time sufficient to produce an aqueous pigment dispersion; adding magnetic particles and non-magnetic abrasive particles to the pigment dispersion, thereby producing a pigment dispersion containing magnetic particles and non-magnetic abrasive particles; applying a constant magnetic field to the pigment dispersion containing magnetic particles and non-magnetic abrasive particles, at a magnetic field strength effective for causing the magnetic particles to move relative to the pigment and non-magnetic abrasive particles, which in turn causes the pigment to be milled by the non-magnetic abrasive particles, thereby producing a pigment dispersion comprising a milled pigment having an average particle size of 10 nm to 500 nm dispersed in aqueous media.