Synergists for Dimeric Pigments

Abstract

Disclosed herein are compositions comprising a dimeric (diarylide) pigment and a synergist, in which the synergist has a structure similar to a monomer of the dimeric pigment. Also disclosed are aqueous dispersions and inkjet inks comprising such compositions. In a first preferred composition, the symmetric diarylide pigment has the following structure: (P-1) and the synergist has the following structure: (S-1). In a second preferred composition, the symmetric diarylide pigment has the following structure: (P-2) and the synergist has the following structure: (S-2).

Dependencies are inferred from the claim text.