	US 12,391,790 B2
	Articles made from hydrophilic thermoplastic polyurethane compositions
Joseph J. Vontorcik, Jr., Broadview Hts., OH (US); and David Cozzens, Dracut, MA (US)
Assigned to Lubrizol Advanced Materials, Inc., Cleveland, OH (US)
Filed by Lubrizol Advanced Materials, Inc., Cleveland, OH (US)
Filed on Mar. 10, 2023, as Appl. No. 18/119,902.
Application 18/119,902 is a division of application No. 16/308,834, previously published as PCT/US2017/038219, filed on Jun. 20, 2017.
Claims priority of provisional application 62/355,490, filed on Jun. 28, 2016.
Prior Publication US 2023/0212348 A1, Jul. 6, 2023
Int. Cl. B29C 45/00 (2006.01); B29C 64/106 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C08G 18/06 (2006.01); C08G 18/08 (2006.01); C08G 18/10 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/73 (2006.01); C08G 18/75 (2006.01); C09D 11/102 (2014.01); B29K 75/00 (2006.01)

CPC C08G 18/758 (2013.01) [B29C 45/0001 (2013.01); B29C 64/106 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C08G 18/10 (2013.01); C08G 18/3206 (2013.01); C08G 18/4833 (2013.01); C08G 18/6674 (2013.01); C08G 18/73 (2013.01); C09D 11/102 (2013.01); B29C 2945/76531 (2013.01); B29K 2075/00 (2013.01); B33Y 80/00 (2014.12); C08G 18/06 (2013.01); C08G 2250/00 (2013.01); C08G 2261/50 (2013.01)]

6 Claims

1. A method of making a 3D printed article comprising:

preparing a thermoplastic polyurethane consisting of the reaction product of one poly(ethylene glycol) having a number average molecular weight of 1400 to 8000, an aliphatic diisocyanate, and a chain extender component selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,3-butanediol, 1,5-pentanediol, neopentylglycol, 1,4-cyclohexanedimethanol, 2,2-bis[4-(2-hydroxyethoxy) phenyl]propane, hexamethylenediol, heptanediol, 3-methyl-1,5-pentanediol, ethylenediamine, butanediamine, hexamethylenediamine, hydroxyethyl resorcinol and mixtures thereof, wherein the thermoplastic polyurethane has a crystallization temperature of at least 75° C. measured by DSC, wherein the aliphatic diisocyanate and chain extender component make up a hard segment of the thermoplastic polyurethane and wherein the thermoplastic polyurethane comprises at least 10 wt % hard segment;

operating a system for solid freeform fabrication of an object, wherein said system comprises a solid freeform fabrication apparatus that deposits small beads of building material in a controlled manner,

wherein the building material comprises the thermoplastic polyurethane.