The article discusses the development and properties of long-chain polyesters, which have emerged as promising materials in recent years due to their potential for circular economy and biodegradability. These polyesters, synthesized from advanced catalytic conversions of plant oils and future prospects include microalgae or waste, exhibit properties similar to polyethylene (PE), such as high crystallinity and melt processing capabilities. They can be recycled via solvolysis, even in mixed waste streams containing polyolefins and poly(ethylene terephthalate), with recovered monomers used to regenerate the materials. The (bio)degradability of these polyesters varies, with some fully mineralizing under industrial composting conditions. The article also explores the impact of in-chain functional groups, such as esters, carbonates, and acetals, on the material properties and biodegradability. The authors highlight the potential of these materials for applications in food packaging, textiles, and other areas, emphasizing their suitability for a circular plastics economy.The article discusses the development and properties of long-chain polyesters, which have emerged as promising materials in recent years due to their potential for circular economy and biodegradability. These polyesters, synthesized from advanced catalytic conversions of plant oils and future prospects include microalgae or waste, exhibit properties similar to polyethylene (PE), such as high crystallinity and melt processing capabilities. They can be recycled via solvolysis, even in mixed waste streams containing polyolefins and poly(ethylene terephthalate), with recovered monomers used to regenerate the materials. The (bio)degradability of these polyesters varies, with some fully mineralizing under industrial composting conditions. The article also explores the impact of in-chain functional groups, such as esters, carbonates, and acetals, on the material properties and biodegradability. The authors highlight the potential of these materials for applications in food packaging, textiles, and other areas, emphasizing their suitability for a circular plastics economy.