Some plastics derived from fossil resources are engineered to biodegrade under specific conditions. These materials are important in the bioplastics landscape as they are often blended with bio-based polymers to improve performance.
Key Biodegradable Fossil-based Polymers
PBAT (Polybutylene Adipate Terephthalate)
A flexible, biodegradable polyester. Often blended with PLA or starch to improve flexibility and toughness. Widely used in compostable bags and agricultural mulch films. Certified compostable under EN 13432.
PCL (Polycaprolactone)
A biodegradable polyester with a low melting point (~60°C). Excellent blend compatibility. Used in medical applications (drug delivery, sutures), specialty packaging, and as a modifier for other biodegradable plastics.
PBS (Polybutylene Succinate)
Can be produced from both fossil and bio-based sources. Good mechanical properties similar to PP. Used in packaging, agricultural films, and textiles. Compostable under industrial conditions.