Toray Develops an Industry-First Solvent Recycling Process for PPS Plastic
Toray Develops an Industry-First Solvent Recycling Process for PPS Plastic
Toray Industries has developed what it describes as the industry’s first solvent-based material recycling technology for recovering polyphenylene sulfide (PPS) from waste materials. The new process selectively dissolves and separates PPS while keeping the polymer in its original form instead of breaking it down into monomers.
The technology could provide a new route for recycling high-performance engineering plastics used in automotive, electrical and electronic applications. Toray says the process can also separate glass fibers and other impurities, potentially improving the quality and efficiency of recycled PPS.
What Is Toray’s New PPS Recycling Technology?
Toray's new technology addresses this challenge by using a solvent to selectively dissolve PPS from waste materials. The recovered polymer is then separated and crystallized, allowing unwanted materials such as glass fibers and other contaminants to be removed.
Unlike some chemical recycling methods, the process does not require PPS to be decomposed into its basic monomers. Instead, the polymer remains intact during the recycling process.
Why PPS Is Difficult to Recycle
PPS is widely used because of its strong thermal and chemical resistance. It is found in components for automobiles as well as electrical and electronic equipment.
However, the same chemical resistance that makes PPS useful also creates challenges for recycling. According to Toray, very few solvents are capable of dissolving PPS effectively.
Waste PPS can also contain glass fibers and other materials. Removing these contaminants while maintaining the properties of the original polymer has been a major challenge for recycling applications.
Recycling PPS Without Breaking the Polymer
One of the main features of Toray's process is that it retains PPS in its polymer form.
Conventional chemical recycling can involve breaking polymers down into monomers before rebuilding them. Toray's solvent-based approach instead focuses on dissolution and separation.
The company says the resulting recycled PPS maintains the same molecular weight and melting point as virgin PPS, characteristics that could make it suitable for demanding applications where consistent material performance is important.
Removing Glass Fibers and Other Impurities
Many PPS products are reinforced with glass fibers to improve their mechanical performance. This is particularly important in automotive and electrical applications.
Toray's technology is designed to separate PPS from glass fibers and other impurities during the recycling process. This could help produce a cleaner recycled polymer compared with recycling approaches where contaminants remain in the material.
The ability to separate the polymer from reinforcing materials is therefore an important part of developing a more effective recycling route for PPS-containing waste.
Potential Energy and Environmental Benefits
Toray says that avoiding the need to decompose PPS into monomers could reduce energy consumption compared with conventional chemical recycling approaches.
A preliminary assessment by the company also indicated that recycled PPS produced through the new technology could have lower cradle-to-factory-gate greenhouse-gas emissions than PPS manufactured from virgin raw materials.
However, Toray is still conducting demonstration testing to verify the potential greenhouse-gas reductions. Therefore, the environmental benefits should currently be regarded as preliminary rather than a finalized life-cycle result.
Supporting Circular Economy Goals
The development comes as industries face increasing pressure to improve resource efficiency and establish circular material flows.
Automotive manufacturers and electronics companies are particularly interested in recycling engineering plastics because these materials can remain valuable after products reach the end of their useful life.
Toray plans to work with companies in the automotive, recycling and other sectors to develop a resource-circulation system covering the collection of PPS-containing waste through the reuse of recovered PPS.
Demonstration and Commercialization Plans
Toray has completed its initial study and is now conducting a larger-scale demonstration project.
The scale-up work is being carried out under a Japanese Ministry of Economy, Trade and Industry project focused on strengthening circular-economy systems through cooperation among industry, government and academia.
The company plans to continue working with external partners and aims to begin commercial supply of recycled PPS at around 2030.
Applications in Automotive and Electronics
The technology could be particularly relevant to industries that use glass-fiber-reinforced PPS.
Automotive components increasingly rely on engineering plastics to combine heat resistance, chemical resistance, electrical performance and lightweight construction. PPS is also used in electrical and electronic components where high-temperature performance and dimensional stability are important.
A recycling technology capable of recovering high-quality PPS could therefore support closed-loop material use in these sectors.
Toray's Broader Recycled PPS Strategy
The new solvent technology builds on Toray's existing work in recycled engineering plastics. The company has previously developed recycled PPS materials under its Ecouse™ TORELINA™ portfolio, including material-recycling technology for glass-fiber-reinforced PPS.
Toray has also been developing other recycled engineering plastics, including recycled PBT and recycled nylon 66, as part of its broader sustainability and circular-material strategy.
Challenges Ahead
Despite the potential advantages, the technology is still moving through the demonstration and scale-up stage.
Solvent-based recycling can involve complex requirements related to dissolution, separation, solvent recovery, impurity removal and process economics. Industry research has identified scale-up, continuous processing, solvent and polymer yields, and overall economic performance as important challenges for solvent-based recycling technologies.
Toray's ongoing demonstration work will therefore be important for determining how effectively the process can operate at larger commercial scales.
What This Means for the Plastics Industry
Toray's development represents another step toward recycling high-performance plastics that have traditionally been difficult to recover.
The ability to separate PPS while preserving its polymer structure could help create a pathway for producing recycled material with properties closer to virgin PPS. If successfully commercialized, the technology could support circular supply chains for automotive, electrical and electronic components.
The planned commercial supply around 2030 also gives Toray and its partners several years to optimize the process, establish waste-collection systems and validate the quality and environmental performance of recycled PPS.
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