MUMBAI, India, July 13 -- Intellectual Property India has published a patent application (202617076391 A) filed by Syensqo Specialty Polymers Usa, LLC on June 19, 2026, for Process For Making Phenolic Monomer Product Of High Purity From A Recycled Polyarylethersulfone Material.
Inventors include Jones, Austin; Chatterjee, Saptarshi; Pollino, Joel; Booher, Matthew; Behera, Girish Chandra; Patel, Hemantkumar Number; Jeol, Stphane; Domenick-Jones, Taylor; Gopalakrishnan, Vijay; and Pandit, Sudarshan.
The application for the patent was published on July 10, 2026, under issue no. 28/2026.
Abstract: A process for producing a phenolic monomer product comprising depolymerizing a recycled polymeric material to obtain a depolymerized mixture comprising phenolic monomers and purifying the depolymerized mixture. The polymeric material comprises at least one PAES polymer and at least one additive, and the PAES polymer preferably comprises a backbone comprising at least one sulfone recurring unit, a first end group being a halide, and a second end-capped group, preferably selected from alkoxy groups and/or phenoxy groups. The additive comprises a polyalkylene oxide and/or a polyvinylpyrrolidone (PVP). A purity of at least 95 wt% of phenolic monomers can be achieved in the product. In particular embodiments in which a recycled hemodialysis membrane comprises a polyethersulfone and PVP, a purity of at least 98 wt% based on the total weight of the phenolic monomer product of 4,4'-sulfonyl phenolic monomers can be achieved after depolymerisation and phenolic monomer purification.
Disclaimer: Curated by HT Syndication.
