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Method-for-detecting-and-separating-thermoplastic-containers-with-near-infrared-fluorosphores

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Method for detecting and separating thermoplastic containers with near infrared fluorosphores

Details

Inventors: Cushman, Michael R.; Krutak, James J.; Parham, William W.; Coates, Clarence A.; Weaver, Max A.; Patonay, Gabor;
Assignee: Eastman Chemical Company (Kingsport, TN)
Primary Examiner: Yoon; Tae
Assistant Examiner:
Attorney, Agent or Firm: Harding; Karen A., Gwinnell; Harry J.

Provided is a method for tagging thermoplastic containers using near infrared fluorescing compounds or copolymerized residues readily capable of detection. Also provided is a method for identifying a thermoplastic container. Also provided are thermoplastic polymer compositions comprised of the near infrared fluorescing compounds or residues and articles comprised of such compositions.

DETAILED DESCRIPTION This invention relates to a method for "marking" or "tagging" a thermoplastic polymeric material by incorporating one or more thermally stable, near infrared fluorescing compounds therein by admixing or copolymerizing or by blending with certain condensation polymers containing one or more near infrared fluorescing compounds copolymerized or admixed therein and a method for separating or sorting a mixture of thermoplastic containers such as bottles.
Also provided are thermoplastic polymer compositions tagged with such compounds or residues.

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