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US 8,894,195 B2Granted
Non-aqueous pigment dispersions using dispersion synergists
AssigneeAgfa Graphics NV
InventorGeert Deroover
Life of this patent
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Abstract
Non-aqueous pigment dispersions exhibit improved dispersion quality and/or stability for a specific selection of naphthol AS pigments and azo pigments by using specific quinacridone dispersion synergists. The non-aqueous pigment dispersions can be advantageously used in inkjet inks inkjet printing methods.
Claims10
A non-aqueous pigment dispersion comprising:
- a non-aqueous dispersion medium, a polymeric dispersant, a pigment, and a dispersion synergist;
- wherein
- the dispersion synergist is represented by Formula (I):
- wherein
- R1 and R2 are each independently selected from the group consisting of hydrogen, alkyl, and halogen;
- and
- the pigment is selected from the group consisting of an azo pigment containing a benzimidazolone group, an azo pigment containing a quinoxalinedione group, and mixed crystals thereof.
4 more elements
Dependencies are inferred from the claim text.