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    • 7. 发明申请
    • POLYAMIDE COMPOSITIONS FOR LED APPLICATIONS
    • 用于LED应用的聚酰胺组合物
    • US20140209969A1
    • 2014-07-31
    • US14239435
    • 2012-08-16
    • Corinne BushelmanNancy J. SingletaryGlenn P. Desio
    • Corinne BushelmanNancy J. SingletaryGlenn P. Desio
    • C08K3/22H01L33/56
    • C08K3/22C08G69/26C08L77/06H01L33/00H01L33/56
    • The invention relates to polyamide composition comprising at least one polyamide featuring a melting temperature (Tm), at least one metal oxide selected from magnesium oxide, zinc oxide and calcium oxide, and titanium dioxide, said composition featuring an intrinsic melt viscosity of below 800 Pa·s as measured according to ASTM D3835-08 at a moisture content as measured according to ASTM D6869-03 in the range of 150-500 ppm at a shear rate of 400 s−1 and at a temperature ranging from [(Tm max) +10° C.] to [(Tm max)+20° C.] where (Tm max) is the highest of all melting temperatures(Tm). Invented compositions feature high reflectivity in the molded part with high retention of whiteness and reflectivity after heat aging. This unique combination of properties makes the compositions according to the invention most suitable for LED applications.
    • 本发明涉及包含至少一种具有熔融温度(Tm)的聚酰胺,至少一种选自氧化镁,氧化锌和氧化钙的金属氧化物和二氧化钛的聚酰胺组合物,所述组合物的特性熔点粘度低于800Pa ·根据ASTM D3835-08测定的水分含量,根据ASTM D6869-03在400-500ppm的范围内以400s -1的剪切速率测量的水分含量,并且在[(Tm max) + 10℃]至[(Tm max)+ 20℃],其中(Tm max)是所有熔融温度(Tm)中最高的。 本发明的组合物在模塑部件中具有高反射率,在热老化后具有高的白度和反射率的保持性。 这种独特的性质组合使得根据本发明的组合物最适合于LED应用。