AN INK COMPOSITION

摘要

An ink composition is disclosed herein. The ink composition includes from about 5 wt% to about 25 wt% of a co-solvent; from about 0.025 wt% to about 0.2 wt% of i) a chelating agent represented by formula 1, wherein R' is a carboxylic acid functional group or a carboxylate salt functional group and n > 2; ii) a chelating agent represented by formula 2:, wherein R is a carboxylic acid functional group or a carboxylate salt functional group, m is greater than or equal to 1, x is greater than or equal to 2, y is greater than or equal to 1, and z is greater than or equal to 2; iii) a chelating agent represented by formula 3, wherein any of r, s, t, or u is a sulfonic acid functional group or a sulfonate functional group; or iv) combinations of any of i, ii, and iii. The ink composition also includes a balance of water.