| abstract |
The invention relates to a synthetic resin, based on partly cross-linked poly(meth)acrylate-urethane-(meth)acrylates in urethane(meth)acrylates, obtainable by: (a) provision of (meth)acrylate monomers (I), which have no groups reactive to isocyanate groups and (meth)acrylate monomers (II), with (a) group(s) reactive to isocyanate groups, (b) polymerization of the (meth)acrylate monomers (I) and (II) to give a poly(meth)acrylate (III), with groups reactive to isocyanate groups, (c) reaction of the poly(meth)acrylate (III) with an isocyanate compound (IV), with more than one isocyanate group, in such a manner that 5 to 40% of the isocyanate groups of the isocyanate compound (IV) react with the above groups reactive to isocyanate groups, whereby partial cross-linking of (III) with an increase in weight average molecular weight by a factor of 2 to 20 occurs, in which one given (IV) reacts with more than one of the isocyanate groups thereof with more than one given (III) and (d) reaction of the compound obtained in (c) with (meth)acrylate monomers (II). The synthetic resin can be used as a binder, for example, in a radical-hardenable composition, suitable for application in the production of composite materials, composite workpieces, and paints with advantageous physical and chemical properties. |