Process for identifying plastics by addition of fluorescent dye

  • US 5,201,921 A
  • Filed: 09/06/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 09/14/1990
  • Status: Expired due to Fees
First Claim
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1. Process for sorting plastic waste or plastic refuse, wherein plastics which have been rendered identifiable by adding 5 to 10,000 ppb of a fluorescent marker to the plastic during or after the manufacture of the plastic are classified according to each type of plastic based on the fluorescence radiation emitted from the plastic.

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