Coalescing agent for three-dimensional (3d) printing

A coalescing agent for three-dimensional (3D) printing, the coalescing agent consisting of:

• a co-solvent present in an amount ranging from about 15 wt % to about 30 wt % of a total wt % of the coalescing agent;
• a surfactant present in an amount ranging from about 0.5 wt % to about 1.4 wt % of the total wt % of the coalescing agent, the surfactant having a hydrophilic lipophilic balance (HLB) value that is less than 10;
• an anti-kogation agent present in an amount ranging from greater than 0.20 wt % to about 0.62 wt % of the total wt % of the coalescing agent;
• a carbon black pigment present in an amount ranging from about 3.0 wt % to about 6.0 wt % of the total wt % of the coalescing agent;
• a polymeric dispersant having a weight average molecular weight ranging from about 12,000 to about 20,000;
• a chelator present in an amount ranging from about 0.03 wt % to about 0.10 wt % of the total wt % of the coalescing agent;
• optionally a biocide;
• and
• a balance of water.

A layer of a 3D printed object, comprising:

• a build material;
• and
• a coalescing agent applied on a surface of at least some of the build material, the coalescing agent including:
• a co-solvent present in an amount ranging from about 15 wt % to about 30 wt % of a total wt % of the coalescing agent;
• a surfactant present in an amount ranging from about 0.5 wt % to about 1.4 wt % of the total wt % of the coalescing agent, the surfactant having a hydrophilic lipophilic balance (HLB) value that is less than 10;
• a carbon black pigment present in an amount ranging from about 3.0 wt % to about 6.0 wt % of the total wt % of the coalescing agent;
• a polymeric dispersant having a weight average molecular weight ranging from about 12,000 to about 20,000;
• and
• a balance of water.