Flame retardant and light diffusing polycarbonate resin composition and light diffusing sheet thereof
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United States of America Patent
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Jun 14, 2011
Grant Date -
Dec 31, 2009
app pub date -
Nov 17, 2006
filing date -
Aug 25, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flame retardant and light diffusing polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A), 0.1 to 6 parts by weight of a light diffusing agent (B) with an average particle diameter of 1 to 10 μm, 0.03 to 1 part by weight of a light storing agent (C) with an average particle diameter of 1 to 20 μm and 0.03 to 1.5 parts by weight of a silicone compound (D) wherein the silicone compound (D) has a branched main chain structure and contains organic functional groups and the presence of aromatic groups is essential as the organic functional groups but the presence of hydrocarbon groups other than aromatic groups is optional as the organic functional groups other than terminal groups. The light diffusing sheet obtained by molding a polycarbonate resin composition of this invention can be used ideally in all applications where excellent flame retardance and a high degree of optical performance are needed such as in parts materials covering a light source such as, for example, in light diffusing sheets for direct backlighting units and edge lighting units for liquid crystal televisions, globe boxes for lighting devices and switches for various devices.
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