MUMBAI, India, Sept. 12 -- Intellectual Property India has published a patent application (202517079489 A) filed by Evonik Operations Gmbh, Essen, Germany, on Aug. 21, for 'process for depolymerizing polyalkylene terephthalates in mixtures with lower-melting polyolefins.'
Inventor(s) include Zander, Christian; Reinsberg, Philip Heinrich; Ruwwe, Johannes; and Blum, Adrian.
The application for the patent was published on Sept. 12, under issue no. 37/2025.
According to the abstract released by the Intellectual Property India: "The invention relates to a process for depolymerizing at least one polymer P1 in polymer mixtures comprising, as well as the at least one polymer P1, also at least one polyolefin PO that has a lower melting point than P1 and is especially a polyethylene PE or polypropylene PP. The polymer P1 is a polyalkylene terephthalate i.e. a polymer comprising terephthalic acid units and alkylene glycol units, in particular polyethylene terephthalate PET or polybutylene terephthalate PBT. The process according to the invention comprises two steps, wherein the polymer P1 is reacted in the first step with a glycol compound G essentially to give cleavage products P2 having shorter chain lengths than P1. In the second step, the cleavage products P2 and any polymers P1 unconverted in the first step are reacted with additionally added glycol compound G and at least partly split into the monomer units. The first step is conducted above and the second step below the melting temperature TPO of the polyolefin PO. This enables simple and efficient separation of the solid polyolefin PO from the mixture obtained after the second step has ended."
The patent application was internationally filed on Jan. 17, 2024, under International application No.PCT/EP2024/051028.
Disclaimer: Curated by HT Syndication.
