Method for tagging thermoplastic materials with near infrared fl

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

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540123, 540124, 540125, 540127, 540128, C07D48722, C07B 4724

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057032297

ABSTRACT:
Provided are new compounds useful as near infrared fluorophoric markers. In the practice of this invention a method is also provided for tagging thermoplastic containers using near infrared fluorescing compounds or copolymerized residues readily capable of detection. The new compounds are phthalocyanine and naphthalocyanine derivatives which are covalently bonded to substituted silicon and aluminum compounds. The methods, compositions, and compounds described herein thus provide a total system useful for marking, for identification purposes, the various classes of thermoplastic wastes, so that they can be identified, sorted, and subsequently recycled.

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