The incorporation of biobased monomers into polymer structures offers the possibility to develop materials in a more climate-friendly way. By using biogenic monomers, the carbon footprint of polymer production can be reduced. In the recent years we have developed thermoplastic and duroplastic polymer materials with specific biobased units for integrating specific functions. An example will be given for liquid crystalline polyesters with bio-based vanillic acid units allowing blending with lignin fraction.1 The resulting melt-spun fibers are excellent precursor fibers for carbon fibers. In addition, incorporation of unsaturated ferulic acid units allows stabilization of fibers by electron beam irradiation, increasing mechanical strength.2 In addition, we present the successful preparation of novel polyester extrusion foams from dilinoleic derivatives for moulded parts and insulations.3,4 The synthesis of the copolyesters was performed successfully to comparably high molar masses by transesterification polymerization in the melt. PBT-based terpolyesters with dilinoleic derivatives were prepared to introduce long alkyl chains as side chains into the polyester basic structure. The incorporation of both types of dilinoleic derivatives results in an increase of solubility, a reduction of glass transition temperatures and a reduced crystallinity. Most importantly, the rheological behavior is altered, especially the elongational rheology towards strain hardening. This has a strong positive influence on the properties of the resulting foam (density, morphology, cell density, weldability. Interestingly, PBT can be replaced in part by polybutylenefuranoate, a fully bio-based polyester with reactive functions for foam stabilization. In a third example, biobased resins components will be introduced, based on terpenes and various sugar components,5,6 that can replace effectively a common methylenediphenylisocyanate dimethacrylate (UMA) crosslinker in high performance duromers and coatings.