Patent ID: 8642695

Claim:
A non-aqueous pigment ink comprising a pigment, a pigment dispersant and a non-aqueous solvent, wherein the pigment dispersant is an acrylic polymer comprising, as constituent monomers: (M1) two or more alkyl (meth)acrylates having an alkyl group of 12 or more carbon atoms, (M2) a (meth)acrylic acid derivative having an amino group, and (M3) a (meth)acrylic acid derivative having a glycidyl group, wherein monomer (M2) is contained in an amount of from 7 to 15 mol % and monomer (M3) is contained in an amount of from 0.5 to 3 mol % based on the total combination of all constituent monomers, and a molar ratio (M2)/(M3) is between 4 to 20.