Patent ID: 6627328
Filing Date: 2003-09-30
Classification: C08L,Y10T

Abstract:
A light-transmissive epoxy resin composition comprising (A) an epoxy resin, (B) a curing accelerator, and (C) an inorganic filler, whereinsaid composition satisfies both the relationships of the following formulae (1) and (2): [{2(nA2+nC2)âˆ’(nA+nC)2}/2]Â½<3.0Ã—10âˆ’3â€ƒâ€ƒ(1) [{2(fA2+fC2)âˆ’(fA+fC)2}/2]Â½<1.0Ã—10âˆ’5â€ƒâ€ƒ(2) wherein nA is the refractive index at T1Â° C. of the cured product of the composition excluding the inorganic filler,nC is the refractive index at T1Â° C. of the inorganic filler, fA is a temperature coefficient of the refractive index of the cured product of the composition excluding the inorganic filler, fC is a temperature coefficient of the refractive index of the inorganic filler, and the temperature coefficient of refractive index is given by the formula (3): f={n(T2)/n(T1)âˆ’1}/(T2âˆ’T1)â€ƒâ€ƒ(3) wherein n(T1) is the refractive index at T1Â° C. and n(T2) is the refractive index at T2Â° C., with the proviso that T12.