Poly(butylene terephthalate-butylene adipate) (PBAT), known under Ecoflex brand name, is being currently used as an alternative to non-biodegradable plastics . PBAT is considered a semi-aromatic, thermoplastic copolyester. It is obtained from petrochemical raw materials, but it is almost 100% biodegradable, and its degradation products are non-toxic. PBAT has a matrix-domain structure and it is made of 20-30 nm crystal domains formed by aromatic PBT sequences arranged in an amorphous matrix.