US 12,447,675 B2
Three-dimensional printing
Emre Hiro Discekici, San Diego, CA (US); Graciela E. Negri Jimenez, San Diego, CA (US); and Shannon Reuben Woodruff, San Diego, CA (US)
Assigned to Peridot Print LLC, Palo Alto, CA (US)
Filed by PERIDOT PRINT LLC, Palo Alto, CA (US)
Filed on May 13, 2024, as Appl. No. 18/662,874.
Application 18/662,874 is a continuation of application No. 17/298,643, granted, now 12,023,861, previously published as PCT/US2019/051720, filed on Sep. 18, 2019.
Application 17/298,643 is a continuation in part of application No. PCT/US2019/045313, filed on Aug. 6, 2019.
Prior Publication US 2024/0293967 A1, Sep. 5, 2024
Int. Cl. B29C 64/165 (2017.01); B29C 64/188 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B29K 105/00 (2006.01)
CPC B29C 64/165 (2017.08) [B29C 64/188 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B29K 2105/0032 (2013.01); B29K 2995/002 (2013.01); B29K 2995/0092 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of modifying surface hydrophilicity of a three-dimensional (3D) printed object, comprising:
based on a 3D object model, selectively applying a core fusing agent on a first layer of polymeric build material to form a patterned portion;
exposing the first layer to energy to selectively coalesce the patterned portion and form a core layer;
applying a second layer of the polymeric build material on the core layer;
based on the 3D object model, selectively applying a primer fusing agent on at least a portion of the second layer to form a second patterned portion, the primer fusing agent including a plasmonic resonance absorber having absorption at wavelengths ranging from 800 nm to 4000 nm and having transparency at wavelengths ranging from 400 nm to 780 nm;
based on the 3D object model, selectively applying a hydrophilic agent on at least a portion of the second patterned portion, wherein the hydrophilic agent includes from 1 wt % to 12 wt % of a hydrophilic polymer dissolved in an aqueous liquid vehicle, wherein the hydrophilic polymer has a molar mass ranging from 1000 g/mol to 12,000 g/mol and is water-absorbent at a water to hydrophilic polymer weight ratio from 2:1 to 1000:1; and
exposing the second layer to energy to selectively coalesce the second patterned portion and form a 3D object layer having a hydrophilic portion.