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AssigneeNippon Chemical Industrial Co., Ltd.
InventorsYutaka Kinose, Ryohei Imamura, Akinori Inoue, Toru Hata, Eriko Okuno
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A red phosphorus base flame retardant for an epoxy resin, which can suppress oxo acid of phosphorus from eluting from red phosphorus and can impart remarkable flame retardancy to an epoxy resin for a semiconductor sealing material. The red phosphorus base flame retardant for an epoxy resin comprises coated red phosphorus which has the surface of red phosphorus particles coated with a thermosetting resin containing an anhydrous zinc compound or the surface of red phosphorus particles coated with an inorganic substance and further 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 μs/cm or below, the slurry having been 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 the coated red phosphorus and heated at 80 ° C. for 20 hours, a concentration of PO4 ions eluted is 10 ppm or below.
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 PO4 ions eluted is 10 ppm or below.
A method of manufacturing a red phosphorus base flame retardant for an epoxy resin, comprising the following steps (A1) to (A3):
A red phosphorus base flame retardant for an epoxy resin, comprising double-coated red phosphorus which has the surface of red phosphorus particles coated with an inorganic substance and further coated with a thermosetting resin containing an anhydrous zinc compound, wherein the double-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 double-coated red phosphorus and heated at 80° C. for 20 hours, a concentration of PO4 ions eluted is 10 ppm or below.
A method of manufacturing a red phosphorus base flame retardant for an epoxy resin, comprising the following steps (B1) to (B5):
A red phosphorous base flame-retardant composition for an epoxy resin, comprising a red phosphorus mixture containing an anhydrous zinc compound and flame-retardant stabilized red phosphorus which has the surface of red phosphorus particles coated with at least one kind selected from thermosetting resins and inorganic substances and has an electric conductivity of 30 μs/cm or below to a slurry prepared by dispersing the coated red phosphorus particles in 10% by weight into water at 20° C., wherein the red phosphorus mixture has properties that when it is dispersed in 10% by weight into water and a prepared slurry is left standing at 80° C. for 20 hours, the slurry has an electric conductivity of 150 μs/cm or below, and when 80 ml of water is added to 8 g of the red phosphorus mixture and heated at 80° C. for 20 hours, a concentration of PO4 ions eluted is 10 ppm or below.
A method of manufacturing a red phosphorus base flame-retardant composition for an epoxy resin, comprising the following steps (C1) to (C6):
Dependencies are inferred from the claim text.