MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202617090200 A) filed by Teijin Frontier Co. , Ltd. on July 24, 2026, for Method For Recovering Polyester And Method For Manufacturing Recycled Polyester Polymer.
Inventors include Kawasaki Keita; Tsuruda Ryo; and Sunouchi Satoshi.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: Provided is a method for recovering polyester from a fiber product containing dye-colored polyester fibers and acrylic fibers, the method being characterized by comprising: a solvent contact step in which the fiber product is brought into contact with an aprotic polar solvent at a temperature of 30-160°C; and an acrylic fiber and dye removal step in which the solvent, along with the acrylic fibers and the dye dissolved therein, is removed from the fiber product to obtain polyester. Provided is a method for manufacturing a recycled polyester polymer with reduced coloration using the method for recovering polyester.
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