Hewlett-packard Development Company, L.p.

Niamh Kelly

Keshava A Prasad

Dennis Z Guo

Richard J McManus

John Breen

Kenneth Hickey

Fiona Coyle

Kevin Rattigan

Linda Sherry

Claire Harley

Paul Mcshane

The present disclosure relates to an ink composition containing a colorant; a hydroxylated co-solvent; a non-hydroxylated co-solvent, a polyurethane binder and water. The weight percent ratio of the hydroxylated co-solvent to the non-hydroxylated co-solvent in the ink composition ranges from 55:45 to 65:35; and the total amount of hydroxylated co-solvent and non-hydroxylated co-solvent in the ink composition is at least 18 wt %. The amount of polyurethane binder in the ink composition is 0.1 to less than 1 wt %.

Ink composition

The present disclosure relates to magenta inkjet inks having a quinacridone pigment and an azo pigment. The azo pigment has at least one azo compound having the formula (I), in which Ris selected from H, aryl and Cto Calkyl, and R, Rand Rare each independently selected from H, a Cto Calkyl, an oxygen-containing, a nitrogen-containing and a sulphur-containing functional group. Where Ris aryl, the aryl is not a phenyl group having at least one hydrogen atom that has been substituted with a chlorine atom. 

Magenta inks

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Leixlip, Ireland

Niamh Kelly