	US 12,258,483 B2
	Method for the additive manufacturing of a silicone elastomer article
Jean-Marc Frances, Meyzieu (FR); Marco Del Torto, Milan (IT); Damien Djian, Genas (FR); Emmanuel Pouget, Lyons (FR); Raphael Mirgalet, Toulouse (FR); and Remi Thiria, Fort Mill, SC (US)
Assigned to ELKEM SILICONES FRANCE SAS, Lyons (FR); ELKEM SILICONES USA CORP., East Brunswick, NJ (US); and ELKEM SILICONI ITALIA S.R.L., Caronno Pertusella (IT)
Appl. No. 17/786,479
Filed by Elkem Silicones France SAS, Lyons (FR); Elkem Silicones USA Corp., East Brunswick, NJ (US); and ELKEM SILICONI ITALIA S.R.L., Caronno Pertusella (IT)
PCT Filed Dec. 18, 2020, PCT No. PCT/EP2020/087233 § 371(c)(1), (2) Date Jun. 16, 2022, PCT Pub. No. WO2021/123315, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19306746 (EP), filed on Dec. 20, 2019.
Prior Publication US 2023/0062134 A1, Mar. 2, 2023
Int. Cl. C09D 11/38 (2014.01); B29C 64/106 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C09D 11/037 (2014.01); C09D 11/102 (2014.01); B29K 83/00 (2006.01)

CPC C09D 11/38 (2013.01) [B29C 64/106 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C09D 11/037 (2013.01); C09D 11/102 (2013.01); B29K 2083/00 (2013.01)]

6 Claims

1. A method for additive manufacturing of a silicone elastomer article using a 3D printer, selected from an extrusion 3D printer and a 3D jetting printer, said method comprising:

1) printing a crosslinkable silicone composition X on a substrate, to form a first layer;

2) printing the crosslinkable silicone composition X on the first or previous layer, to form a subsequent layer;

3) optionally repeating 2); and

4) allowing the first and subsequent layers to crosslink, optionally by heating, to obtain a silicone elastomer article; wherein the crosslinkable silicone composition X comprises:

(A) at least one organopolysiloxane compound A comprising, per molecule, at least two C2-C6 alkenyl radicals bonded to silicon atoms;

(B) at least one organohydrogenopolysiloxane compound B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom;

(D) at least one thixotropic agent D selected from organosilicon compounds containing, per molecule, at least one cyclic amine functional group;

(E) at least one filler E; and

(F) optionally at least one crosslinking inhibitor F;

said crosslinkable silicone composition X having a nitrogen content between 0.003 and 0.02 wt. %, optionally between 0.004 and 0.017 wt. %, and optionally between 0.0045 and 0.016 wt. %.