Abstract: A method for preparing a 3D-printed silicone comprising: a) preparation of a 3D model of a preproduct; b) additive manufacturing of the preproduct according to the 3D model of the preproduct using an additive manufacturing device and an additive manufacturing composition comprising: i) at least one silicone building block bearing a plurality of alkenyl groups (A); ii) at least one crosslinking agent bearing a plurality of thiol groups (B); iii) at least one free radical photoinitiator (D); c) post-curing treatment that comprises at least one further curing step other than light-promoted curing, preferably either heat promoted radical curing or silanol condensation curing; wherein the ratio of thiol groups to alkenyl groups in the additive manufacturing composition is in the range from 0.5:1 to 5:1.

Abstract: An apparatus for producing a three-dimensional object comprises an energy source of electro-magnetic radiation and an open-top container having a closed bottom and sidewalls, the closed bottom being at least in part transparent for the electro-magnetic radiation. The open-top container is configured to contain solidifiable paste which solidifies in response to the electro-magnetic radiation supplied by the energy source. A build platform moves in a vertical direction vertically above the container and moves away from the closed bottom during an object building process. A paste spreader assembly moves horizontally along a first direction during a paste spreading process to evenly spread and define a layer thickness of the solidifiable paste at least in part across the closed bottom of the container. The paste spreader assembly comprises at least one blade having at least one planar facet which faces the bottom of the container.

Abstract: Additive manufacturing compositions are disclosed that include at least one alkenyl-derivatized polysiloxane and at least one mercapto-derivatized polysiloxane crosslinking agent of formula (I): R1(R)2SIO((R3R4)SiO)xSi(R)2R2 (I), wherein R is independently C(1-12)alkyl; R1, R2, R3, R4 are independently C(1-12)alkyl, or mercapto-C(1-12)alkyl; x is 1 or more; with the proviso that at least one of R1, R2, R3, R4 is mercapto-C(1-12)alkyl, and wherein the at least one alkenyl-derivatized polysiloxane and the at least one mercapto-derivatized polysiloxane crosslinking agent form a stable emulsion; their use in additive manufacturing as well as 3D printed silicone objects obtained from these compositions.

Abstract: The present invention relates to an apparatus (1) for producing a three-dimensional object.

Abstract: Additive manufacturing compositions are disclosed comprising at least one alkenyl-derivatized polysiloxane and at least one mercapto-derivatized polysiloxane crosslinking agent of formula (I): R1(R)2SiO((R3R4)SiO)xSi(R)2R2 (I), wherein R is independently C(1-12)alkyl: R1, R2, R3, R4 are independently C(1-12)alkyl, or mercapto-C(1-12)alkyl; x is 1 or more; with the proviso that at least one of R1, R2, R3, R4 is mercapto-C(1-12)alkyl, and wherein the at least one alkenyl-derivatized polysiloxane and the at least one mercapto-derivatized polysiloxane cross-linking agent form a stable emulsion; their use in additive manufacturing as well as 3D printed silicone objects obtained from these compositions.