accordingly a polycyclic carbonate is transesterified with the polymer resin in the melt preferably upon extrusion optionally in the presence of a catalyst significantly the cyclic carbonates are by the inventive process inserted into the structure of the polymer effecting branching of the molecular structure a branching which manifests itself in the modified properties of the resin application_number US 76437796 A description shown below are schematic representations of the inventive process polycarbonate being but a representative of the resins which may thus be branched in the context of the present invention transesterification refers to an intermolecular reaction between chains more particularly to interchanges between a polycyclic oligocarbonate and a linear resin also in the present context the term 34 polycyclic oligocarbonate 34 refers to a compound or a mixture of compounds which contains at least one residue of a trifunctional and or tetrafunctional moiety and at least one carbonate bond according to the schematic representation a linear polycarbonate resin is transesterified in the melt for instance in an extruder optionally in the presence of a suitable transesterification catalyst with a specifically structured polycyclic oligocarbonate the process results in a branched resin while the inventors do not wish to be bound by theory the process of the present invention.