US 11,993,004 B2
Molding process and compositions therefor
Ilya Gorodisher, Stillwater, MN (US); and Gregory P. Sorenson, Maplewood, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/641,289
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Sep. 24, 2020, PCT No. PCT/IB2020/058944
§ 371(c)(1), (2) Date Mar. 8, 2022,
PCT Pub. No. WO2021/059189, PCT Pub. Date Apr. 1, 2021.
Claims priority of provisional application 62/983,318, filed on Feb. 28, 2020.
Claims priority of provisional application 62/907,211, filed on Sep. 27, 2019.
Prior Publication US 2022/0332042 A1, Oct. 20, 2022
Int. Cl. B29C 64/124 (2017.01); B29K 105/00 (2006.01); B29L 31/00 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01)
CPC B29C 64/124 (2017.08) [B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); B29K 2049/00 (2013.01); B29K 2105/0002 (2013.01); B29L 2031/757 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method comprising:
making a shaped model comprising a cyanoacrylate polymer;
preparing an investment that has a cavity corresponding to the shaped model; and
heating the shaped model to sufficient temperature that the cyanoacrylate polymer depolymerizes and volatilizes, wherein the shaped model is formed by an additive manufacturing process comprising successively curing superposed layers of a curable composition comprising: a cyanoacrylate monomer, a free-radical initiator, and a protected amine, and wherein the curable composition is free of unprotected amine.