Patent ID: 6858300
Filing Date: 2005-02-22
Classification: C08K,C09K,H01L,H05K,Y10S,Y10T

Abstract:
1. A red phosphorus base flame retardant for an epoxy resin, comprising coated red phosphorus which has the surface of red phosphorus particles coated with a thermosetting resin containing an anhydrous zinc compound, wherein said coated red phosphorus has properties that its slurry prepared by dispersing in 10% by weight into water at 20° C. has an electric conductivity of 30 μs/cm or below, said slurry which is left standing at 80° C. for 20 hours has an electric conductivity of 150 μs/cm or below, and when 80 ml of water is added to 8 g of said coated red phosphorus and heated at 80° C. for 20 hours, a concentration of PO 4 ions eluted is 10 ppm or below.