Methods of making quinacridone nanoscale pigment particles

Details Methods of making quinacridone nanoscale pigment particles Methods of making quinacridone nanoscale pigment particles

2007-11-01

2008-09-23

Green, Anthony J (Department: 1793)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S495000, C546S049000, C546S056000

Reexamination Certificate

active

07427324

ABSTRACT:
A nanoscale pigment particle composition includes a quinacridone pigment having at least one functional moiety, and a sterically bulky stabilizer compound having at least one functional group, wherein the functional moiety associates non-covalently with the functional group; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, so as to afford nanoscale-sized particles of the pigment. The composition is made by providing a first solution containing a quinacridone pigment precursor or a crude quinacridone pigment, having at least one functional moiety; providing a second solution containing stabilizer molecules of a sterically bulky stabilizer compound having one or more functional groups that associate non-covalently with the functional moiety of the pigment or precursor; combining the first and second solutions to form a third mixture of precipitated quinacridone pigment particles having nanoscale particle sizes, and wherein the functional moiety of the pigment associates non-covalently with the functional group of the stabilizer compound.

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