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Photoluminescent markers and methods for detection of such markers

  • US 6,808,542 B2
  • Filed: 12/26/2001
  • Issued: 10/26/2004
  • Est. Priority Date: 12/26/2001
  • Status: Expired due to Fees
First Claim
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1. Photoluminescent marker compound comprising fluorene copolymers, said fluorene copolymers being colorless or nearly colorless upon exposure to ambient light and being photoluminescent between about 380 and 800 nm upon exposure to ultra-violet radiation or laser light, said fluorene copolymers having a general formula as follows:

  • embedded imagewherein;

    R1 and R2 are C1-C24 linear or branched alkyl chain, n is the number of repeating unit, M is a co-monomer unit having the following structures;

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    R3, R4 and R5 are hydrogen, C1-C12 linear or branched alkyl, alkylene, alkyloxy, hydroxy alkyl, amino alkyl, cyanato alkyl, mercaptoalkyl, or poly(oxyalkylene)ether.

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