POLYMERIC MATERIALS
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United States of America Patent
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Issued Date -
Apr 24, 2014
app pub date -
Jun 18, 2012
filing date -
Jun 17, 2011
priority date (Note) -
Abandoned
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Abstract
A method of making a sheet structure comprising a first polycarbonate layer which comprises a UV-absorbing compound and a second polycarbonate layer comprises: (i) selecting a liquid formulation comprising a vehicle, for example a trimellitate or low molecular weight acrylic and an UV absorbing additive; and (ii) mixing the liquid formulation with polycarbonate when said first polymeric material is in a molten state, for example in an extruder.
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