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High refractive index thermoplastic polyphosphonates

  • US 6,288,210 B1
  • Filed: 11/12/1999
  • Issued: 09/11/2001
  • Est. Priority Date: 11/12/1999
  • Status: Expired due to Fees
First Claim
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1. A phosphonate homopolymer or copolymer having units of the formula:

  • wherein R1, R2, and R3 are independently O or S;

    at least one of R1, R2, and R3 is S;

    R4 is a linear or branched C1-C4 alkyl or C1-C4 haloalkyl, phenyl, chlorophenyl, p-tolyl, benzyl, biphenyl, or cyclohexyl; and

    R5 is

    or any combination of any of the foregoing.

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