100% Biodegradable Compostable Cornstarch Plastic Pellet For Injection Granules

But both recycling and biopolymers face obstacles. Despite years of effort, the plastics recycling rate in the US, for instance, is still less than 10%. And biopolymers-often the products of fermentation-struggle to achieve the same performance and manufacturing scale of the established synthetic polymers they are meant to replace.

PBAT combines some of the beneficial attributes of synthetic and biobased polymers. It is derived from common petrochemicals-purified terephthalic acid (PTA), butanediol, and adipic acid-and yet it is biodegradable. As a synthetic polymer, it can readily be produced at large scale, and it has the physical properties needed to make flexible films that rival those from conventional plastics.

Interest in PBAT is taking off. Established producers such as Germany's BASF and Italy's Novamont are seeing increased demand after decades of cultivating a market. And they are being joined by over a half-dozen Asian producers, which expect brisk business in the polymer as regional governments push for sustainability.

Marc Verbruggen, former CEO of the PLA maker NatureWorks and now an independent consultant, considers PBAT the "cheapest and easiest way to make a bioplastics product."He sees it emerging as the preeminent flexible bioplastic, ahead of contenders such as polybutylene succinate (PBS) and PHA. And it will likely become one of the two most important biodegradable plastics overall, alongside PLA, which he says is becoming the major product for rigid applications.

PBAT's main selling point-its biodegradability-comes from ester linkages, as opposed to carbon-carbon backbones seen in non-degradable polymers such as polyethylene, according to Ramani Narayan, a professor of chemical engineering at Michigan State University. Ester bonds are susceptible to hydrolysis and attack from enzymes.

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