Patent ID: 9738804
Date: 2017-08-22
CPC Classifications: B41J,C09D

Claim:
1. An ink composition, comprising: a colorant; a hydroxylated co-solvent; a non-hydroxylated co-solvent, wherein a weight percent ratio of the hydroxylated co-solvent to the non-hydroxylated co-solvent in the ink composition ranges from 46:54 to about 62:38; an acid selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof; a polyurethane copolymer binder formed from the polymerization of a diisocyanate and at least three diols including a first diol containing a hydrophilic stabilizing group, and a second diol having less than 8 atoms in a backbone chain between two hydroxyl groups, wherein a mole percentage of the second diol is at least 30% of a total mole percentage of diol monomers in the polyurethane copolymer binder, and wherein an acid number of the polyurethane copolymer binder ranges from 50 to 75; lithium present in an amount ranging from about 50 ppm to about 400 ppm; and water.