Biopolymers as alternative for PVC and PU?
Ethylene vinyl acetate (also known as EVA) is the copolymer of ethylene and vinyl acetate and is a replacement for PVC.

Biomass > (fermentation) > Bioethanol > Ethene

Ethylene + acetic acid + 1/2 O2 → Vinyl acetate + H2O



Tung oil can be used to create a plastic like water proofing film as a replacement for PU