Patent ID: 8779059
Filing Date: 2014-07-15
Classification: C08F,C08G,C08L,H01L

Abstract:
1. An optical semiconductor sealing resin composition comprising: a rubber-particle-dispersed epoxy resin (A) containing an alicyclic epoxy resin and, dispersed therein, rubber particles; wherein the rubber particles have a multilayer structure comprising a core and at least one shell layer covering the core, wherein a polymer constituting the core contains, as constitutional monomeric components, wherein the shell layer includes, as constitutional monomeric components, wherein the reactive crosslinking monomers include divinylbenzenes, allyl (meth)acrylates, ethylene glycol di(meth)acrylates, diallyl maleate, triallyl cyanurate, diallyl phthalate, and butylene glycol diacrylate, and wherein the hydroxyl group and/or carboxyl group is a functional group capable of reacting with the alicyclic epoxy resin; wherein the rubber particles have an average particle diameter of 10 nm to 500 nm and a maximum particle diameter of 50 nm to 1000 nm; wherein a difference in refractive index between the rubber particles and a cured article obtained from the optical semiconductor sealing resin composition falls within ±0.02; wherein the rubber-particle-dispersed epoxy resin (A) is present in an amount of 50 to 100 percent by weight based on a total amount of epoxy-containing resins in the composition; and wherein the rubber-particle-dispersed epoxy resin (A) is prepared by dehydrating and drying the rubber particles to produce a powder, and blending and dispersing the powder into the alicyclic epoxy resin.