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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12258453 B1

PDFFull Text
Date of Patent:
Mar. 25, 2025

Filed:

Jun. 24, 2022

Method for improving hue of recycled bis-2-hydroxylethyl terephthalate by using ionic liquids

Applicant:

Nan Ya Plastics Corporation, Taipei, TW;

Inventors:

Te-Chao Liao, Taipei, TW;

Jung-Jen Chuang, Taipei, TW;

Wei-Sheng Cheng, Taipei, TW;

Zhang-Jian Huang, Taipei, TW;

Yu-Ti Tseng, Taipei, TW;

Assignee:

NAN YA PLASTICS CORPORATION, Taipei, TW;

Attorney:

Li & Cai Intellectual Property (USA) Office

Primary Examiner:

Katie L Hammer

Int. Cl.
CPC ...
C08J 11/24 (2006.01); B01D 9/00 (2006.01); B01D 15/12 (2006.01); B01D 15/16 (2006.01); C07C 67/56 (2006.01); C08J 11/28 (2006.01);
U.S. Cl.
CPC ...
C08J 11/24 (2013.01); B01D 9/0013 (2013.01); B01D 15/12 (2013.01); B01D 15/161 (2013.01); C07C 67/56 (2013.01); C08J 11/28 (2013.01); B01D 2009/0086 (2013.01); C08J 2367/02 (2013.01); Y02W 30/62 (2015.05);
Abstract

A method for improving hue of recycled bis-2-hydroxylethyl terephthalate by using ionic liquids including providing a recycled polyester fabric; using a chemical de-polymerization liquid to chemically de-polymerize the recycled polyester fabric to form a de-polymerization product; mixing the de-polymerization product with water to form an aqueous phase liquid; dispersing an ionic liquid impurity adsorption material into the aqueous phase liquid to adsorb impurities originally present in the recycled polyester fabric.

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Liao, Te-Chao. (2025). Method for improving hue of recycled bis-2-hydroxylethyl terephthalate by using ionic liquids (U.S. Patent No. 12258453). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12258453

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