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WEATHERABLE TRANSPARENT HIGH HEAT POLYCARBONATE COPOLYMER COMPOSITION

  • US 20200131362A1
  • Filed: 10/28/2019
  • Published: 04/30/2020
  • Est. Priority Date: 10/29/2018
  • Status: Active Grant
First Claim
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1. A thermoplastic composition comprising:

  • a copolycarbonate comprising bisphenol A carbonate units and second carbonate units different from the bisphenol A carbonate units, wherein the second carbonate units are present in an amount of 10-50 mol %, based on a sum of moles of bisphenol A carbonate units and second carbonate units;

    a poly(carbonate-arylate ester) copolymer comprising bisphenol A carbonate units and monoaryl arylate ester units, wherein the monoaryl arylate ester units are present in an amount of 5-50 mol %, based on the sum of moles of bisphenol A carbonate units and monoaryl arylate ester units; and

    optionally a bisphenol A homopolycarbonate;

    wherein the thermoplastic composition has one or more of;

    a Vicat B120 softening temperature of 155°

    C. or greater, as measured according to ISO 306; and

    a yellowness index of less than 10, as measured according to ASTM D1925 on a plaque having a thickness of 3 mm and molded at a temperature of 360°

    C. for a residence time of 5 minutes; and

    an increase in yellowness index of less than 5, after 600 hours of weathering in accordance with ISO 11341 on a molded plaque having a thickness of 1 mm.

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