Red phosphorus-based flame retardant for epoxy resins, epoxy resins red phosphorus-based flame retardant compositions, methods for their preparation, the epoxy resin composition for semiconductor sealing material, a sealing material and semiconductor device

摘要

The red phosphorus base flame retardant for an epoxy resin is provided, which has red phosphorus particles coated with a thermosetting resin containing an anhydrous zinc compound. The coated red phosphorus has properties that a slurry having the coated red phosphorus dispersed in 10% by weight into water at 20° C. has an electric conductivity of 30 mus/cm or below, the slurry having been left standing at 80° C. for 20 hours has an electric conductivity of 150 mus/cm or below, and when 80 ml of water is added to 8 g of the coated red phosphorus and heated at 80° C. for 20 hours, a concentration of PO4 ions eluted is 10 ppm or below.