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Plastic composition comprising a polycarbonate made from low sulfur bisphenol A, and articles made therefrom

  • US 9,771,452 B2
  • Filed: 08/29/2016
  • Issued: 09/26/2017
  • Est. Priority Date: 02/29/2012
  • Status: Active Grant
First Claim
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1. A light emitting device, comprising:

  • a lighting element located in a housing, wherein the housing is formed from a plastic composition comprising;

    a polycarbonate formed from reacting, in the presence of a transesterification catalyst, a diaryl carbonate ester and a bisphenol A, wherein the bisphenol A has a sulfur concentration of 1 ppm to 15 ppm, based upon a weight of the bisphenol A; and

    a conversion material wherein the conversion material comprises an inorganic material that converts radiation of a certain wavelength and re-emits of a different wavelength;

    wherein after the conversion material has been exposed to an excitation source, the conversion material has a luminescence lifetime of less than 10

    4
    seconds when the excitation source is removed.

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