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US 8,871,015 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 exhibiting improved dispersion quality and/or stability were prepared for a specific selection of naphthol AS pigments, diketopyrrolo-pyrrole pigments and quinacridone pigments, by using specific yellow monoazo dispersion synergists. The non-aqueous pigment dispersions can be advantageously used in inkjet inks inkjet printing methods.
Claims13
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):
- one of R1 and R2 is represented by the group:
- the other one of R1 and R2 is represented by the group:
- and
- wherein the pigment is selected from the group consisting of naphthol AS pigments C.I. Pigment Red 170 and 210, diketopyrrolo-pyrrole pigments, unsubstituted quinacridone, dimethyl substituted quinacridone pigments, dichloro substituted quinacridone pigments, and mixed crystals of quinacridones wherein all the quinacridones present in the mixed crystals are selected from the group consisting of unsubstituted quinacridones, dimethyl substituted quinacridones, and dichloro substituted quinacridones.
4 more elements
Dependencies are inferred from the claim text.