Three-dimensional printing with secondary antioxidants

A three-dimensional printing kit comprising:

• a powder bed material comprising polymer particles;
• a fusing agent to selectively apply to the powder bed material, the fusing agent comprising water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation energy and converts the radiation energy to heat;
• and
• an antioxidant agent to selectively apply to the powder bed material, the antioxidant agent comprising water and a dispersion of particles of a secondary antioxidant having an average particle size ranging from about 10 nm to about 800 nm.

A method of making a three-dimensional printed object comprising:

• iteratively applying individual build material layers of polymer particles to a powder bed;
• based on a three-dimensional object model, selectively jetting a fusing agent onto the individual build material layers, wherein the fusing agent comprises water and an electromagnetic radiation absorber;
• based on the three-dimensional object model, selectively jetting an antioxidant agent onto the individual build material layers, wherein the antioxidant agent comprises water and a dispersion of particles of a secondary antioxidant having an average particle size ranging from about 10 nm to about 800 nm;
• and
• exposing the powder bed to energy to selectively fuse the polymer particles in contact with the electromagnetic radiation absorber to form a fused polymer matrix at individual build material layers.