US 11,884,000 B2
One part, catalyst containing, moisture curable dual cure resins for additive manufacturing
Andrew Gordon Wright, Mountain View, CA (US)
Assigned to Carbon, Inc., Redwood City, CA (US)
Filed by Carbon, Inc., Redwood City, CA (US)
Filed on Aug. 5, 2022, as Appl. No. 17/817,673.
Claims priority of provisional application 63/237,693, filed on Aug. 27, 2021.
Prior Publication US 2023/0182376 A1, Jun. 15, 2023
Int. Cl. B29C 64/106 (2017.01); B29C 64/35 (2017.01); B33Y 70/00 (2020.01); C08G 18/78 (2006.01); C08G 18/10 (2006.01); C08G 18/30 (2006.01); C08G 18/58 (2006.01); B33Y 10/00 (2015.01); C08G 18/20 (2006.01); B29K 75/00 (2006.01)
CPC B29C 64/106 (2017.08) [B29C 64/35 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C08G 18/10 (2013.01); C08G 18/2081 (2013.01); C08G 18/302 (2013.01); C08G 18/584 (2013.01); C08G 18/7843 (2013.01); B29K 2075/02 (2013.01)] 20 Claims
 
1. An additive manufacturing method of making a three-dimensional object comprising polyurea, comprising:
(a) dispensing a one part (1K) dual cure resin into a stereolithography apparatus, the resin comprising:
(i) a photoinitiator,
(ii)) a reactive blocked polyisocyanate, the reactive blocked polyisocyanate comprising the reaction product of a polyisocyanate and an amine or hydroxyl (meth)acrylate or (meth)acrylamide monomer blocking agent,
(iii) a catalyst for the reaction of an isocyanate with water, and
(iv) optionally a polyepoxide;
(b) additively manufacturing from said resin an intermediate object comprising the light polymerization product of said reactive blocked polyisocyanate;
(c) optionally cleaning said intermediate object; and
(d) reacting said polymerization product in said intermediate with water to generate polyamine in situ that sequentially reacts with the remainder of the polymerization product to form urea linkages and thereby produce a three-dimensional object comprising polyurea.