Transparent thermoplastic composition containing polytetrafluoroethylene particles
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United States of America Patent
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Aug 24, 2004
Grant Date -
Jun 26, 2003
app pub date -
Dec 31, 2002
filing date -
Mar 7, 2000
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Abstract
The thermoplastic composition according to the invention for shaped light-scattering articles, based on a transparent thermoplastic formed from (meth)acrylic (co)polymer and on light-scattering particles, comprises polytetrafluoroethylene (PTFE) particles or a mixture of PTFE particles and particles of a mineral and/or organic substance, these light-scattering particles having a mean size of 0.5 .mu.m to 200 .mu.m and a refractive index which differs from that of the transparent thermoplastic by at least .+-.0.05 and being used in an amount, with respect to the total composition, of 5 ppm to 2000 ppm by weight. Application to light display devices and to flat light screens comprising a sheet obtained from the composition.
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