US 12,251,874 B2
Three-dimensional printing with pigment reactants
Shannon Reuben Woodruff, San Diego, CA (US); Emre Hiro Discekici, San Diego, CA (US); and Graciela Emma Negri Jimenez, San Diego, CA (US)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 17/293,266
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Jul. 15, 2019, PCT No. PCT/US2019/041845
§ 371(c)(1), (2) Date May 12, 2021,
PCT Pub. No. WO2021/010971, PCT Pub. Date Jan. 21, 2021.
Prior Publication US 2022/0332044 A1, Oct. 20, 2022
Int. Cl. B29C 64/165 (2017.01); B22F 10/14 (2021.01); B29C 64/153 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B29K 105/00 (2006.01)
CPC B29C 64/165 (2017.08) [B22F 10/14 (2021.01); B29C 64/153 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B29K 2105/0032 (2013.01); B29K 2105/005 (2013.01); B29K 2995/0026 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of making a three-dimensional printed article 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 a radiation absorber;
based on the three-dimensional object model, selectively jetting a first reactive agent onto the individual build material layers, wherein the first reactive agent comprises water and a dissolved first pigment reactant, and wherein the dissolved first pigment reactant includes FeSO4, NaOH, Na2SO4, BaCl2, CuSO4, NaHCO3, Na2CO3, Na2CrO4, K2CrO4, ZnSO4, ZnCl2, or K3[Fe(CN)6];
based on the three-dimensional object model, selectively jetting a second reactive agent onto the individual build material layers, wherein the second reactive agent comprises water and a dissolved second pigment reactant, and wherein the dissolved second pigment reactant includes FeSO4, NaOH, Na2SO4, BaCl2, CuSO4, NaHCO3, Na2CO3, Na2CrO4, K2CrO4, ZnSO4, ZnCl2, or K3[Fe(CN)6];
reacting the second pigment reactant with the first pigment reactant to form a water-insoluble pigment, wherein the water-insoluble pigment includes iron oxide red, barium white, basic copper carbonate, zinc chrome yellow, or Prussian blue; and
exposing the powder bed to energy to selectively fuse the polymer particles in contact with the radiation absorber to form a fused polymer matrix at individual build material layers.