Method for producing an object from a precursor, and use of a radically crosslinkable resin in an additive production method

A process for producing an object from a precursor, comprising:

• I) depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor, wherein the carrier is arranged inside a container and is vertically lowerable in the direction of the gravitational force, and wherein the container contains the free-radically crosslinkable resin in an amount sufficient to cover at least the carrier and crosslinked resin deposited atop the carrier;
• II) depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply, wherein before each step II) the carrier is lowered by a predetermined distance so that above the uppermost ply of the construction material viewed in the vertical direction a layer of the free-radically crosslinkable resin is formed;
• III) repeating step II) until the precursor is formed;
• wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the precursor and
• wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ≥5 mPas to ≤100000 mPas,
• wherein the free-radically crosslinkable resin has a curable component in which NCO groups and olefinic C═C double bonds are present,
• wherein in the curable component the molar ratio of NCO groups to olefinic C═C double bonds is in a range from ≥1:5 to ≤5:1,
• and in that, after step III), step IV) is further performed:
• IV) treating the precursor obtained after step III) under conditions sufficient to at least partially trimerize to isocyanurate groups NCO groups present in the free-radically crosslinked resin of the obtained precursor to obtain the object.