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

Abstract

A process for producing an object from a precursor comprises the steps of: 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; 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; 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 object and wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ≥5 mPas to ≤100000 mPas. In the process the free-radically crosslinkable resin comprises 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. In the process, 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. The invention further relates to the use of a free-radically crosslinkable resin having a viscosity (23° C., DIN EN ISO 2884-1) of ≥5 mPas to ≤100000 mPas in an additive manufacturing process, wherein the resin comprises a curable compound having isocyanurate groups, NCO groups and olefinic C═C double bonds. The invention finally relates to a polymer obtainable by crosslinking such a resin.

Dependencies are inferred from the claim text.