Quinacridone nanoscale pigment particles
AssigneeXerox Corporation
InventorsMaria M. Birau, Rina Carlini, C. Geoffrey Allen, Sandra J. Gardner, Karl W. Dawson, Peter G. Odell, Paul F. Smith, Caroline M. Turek, Roger E. Gaynor, Jeffrey H. Banning
Life of this patent
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Abstract
A nanoscale pigment particle composition includes a quinacridone pigment including at least one functional moiety, and a sterically bulky stabilizer compound including 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, to afford nanoscale-sized particles.
Claims30
A nanoscale pigment particle composition, comprising:
- 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
- presence of the associated stabilizer limits an extent of particle growth and aggregation, to afford nanoscale-sized particles.
A process for preparing nanoscale quinacridone pigment particles, comprising:
- preparing a first solution comprising:
- (a) a crude quinacridone pigment having at least one functional moiety and (b) a liquid medium;
- preparing a second solution comprising:
- (a) a sterically bulky stabilizer compound having one or more functional groups that associates non-covalently with the functional moiety, and (b) a liquid medium;
- combining the first solution into the second solution to form a third solution and
- effecting a direct coupling reaction which forms a quinacridone pigment composition wherein the functional moiety associates non-covalently with the functional group and having nanoscale particle size.
A process for preparing nanoscale quinacridone pigment particles, comprising:
- preparing a first solution comprising a quinacridone pigment having at least one functional moiety in an acid;
- preparing a second solution comprising an organic medium and a sterically bulky stabilizer compound having one or more functional groups that associate non-covalently with the functional moiety of the pigment;
- adding the first solution to the second solution;
- and
- precipitating quinacridone pigment particles from the first solution, wherein the functional moiety associates non-covalently with the functional group and the quinacridone pigment particles have a nanoscale particle size.
Dependencies are inferred from the claim text.