| abstract |
The present invention relates to an acrylated and/or methacrylated urethane oligomer obtained by reaction of a specific polyamine a) with a cyclic carbonate compound b) carrying m cyclic carbonate groups, giving an intermediate product c) carrying m formed urethane groups which carry residual reactive amine —NH— groups, and subsequently an addition reaction of each of the said residual reactive amine groups of the said product c) with an acrylate group of a compound d) carrying, in addition to the said acrylate group, p additional acrylate and/or methacrylate groups, with each residual reactive amine —NH— group of the said product c) being thus converted into a carbon-nitrogen bond carrying the said acrylate and/or methacrylate groups, and thus production of the said urethane oligomer, with each carbon-nitrogen bond formed carrying p acrylate and/or methacrylate groups and the said urethane oligomer carrying m urethane groups and m hydroxyl groups in the alpha or beta position with respect to the said urethane and having a functionality in acrylates and/or methacrylates ranging from m*p(n−1) to m*p(2n−2). n The invention also relates to a process for the preparation of the said oligomer in two stages, to the intermediate product c) and to the use of the said urethane oligomer in crosslinkable compositions, in particular in coating compositions, adhesive compositions, compositions for systems for the layer-by-layer manufacture of 3D objects, compositions for 3D printing systems, moulding compositions, leaktightness agent compositions, chemical sealing compositions, concrete compositions or composite compositions. |