US 12,227,659 B2
Three-dimensional printing with pore-promoting agents
Emre Hiro Discekici, San Diego, CA (US); Shannon Reuben Woodruff, San Diego, CA (US); Stephen G. Rudisill, San Diego, CA (US); and Alexey S. Kabalnov, San Diego, CA (US)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 17/298,923
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Jun. 10, 2019, PCT No. PCT/US2019/036229
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/251520, PCT Pub. Date Dec. 17, 2020.
Prior Publication US 2022/0089892 A1, Mar. 24, 2022
Int. Cl. C09D 11/38 (2014.01); B29C 64/165 (2017.01); B29K 77/00 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 70/10 (2020.01); C08K 3/26 (2006.01); C08L 77/02 (2006.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01); C09D 11/104 (2014.01); C09D 11/107 (2014.01); C09D 11/108 (2014.01); C09D 11/324 (2014.01)
CPC C09D 11/38 (2013.01) [B29C 64/165 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 70/10 (2020.01); C08K 3/26 (2013.01); C08L 77/02 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/104 (2013.01); C09D 11/107 (2013.01); C09D 11/108 (2013.01); C09D 11/324 (2013.01); B29K 2077/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A materials kit for three-dimensional printing, comprising:
a powder bed material comprising crystalline or semi-crystalline polymer particles selected from the group consisting of nylon 6 particles, nylon 9 particles, nylon 11 particles, nylon 12 particles, nylon 6,6 particles, nylon 6,12 particles, polyethylene particles, polypropylene particles, polyester particles, polyether ketone particles, polyacrylate particles, and a combination thereof;
a fusing agent comprising water and a radiation absorber to selectively apply to the powder bed material, wherein the radiation absorber absorbs radiation energy and converts the radiation energy to heat; and
a pore-promoting agent comprising water and a water-soluble pore-promoting compound to selectively apply to the powder bed material, wherein the pore-promoting compound:
is selected from the group consisting of a carbohydrazide, urea, a urea homologue, a carbamide-containing compound, ammonium carbonate, ammonium nitrate, ammonium nitrite, and a combination thereof;
chemically reacts at an elevated temperature to generate a gas; and
is present in the pore-promoting agent in an amount of from about 0.5 wt % to about 8 wt % with respect to a total weight of the pore-promoting agent.