US Patent 7858173 Thermoplastic polyhydroxy polyether resin and resin composition comprising the same

A novel flame-retardant thermoplastic polyhydroxy polyether resin obtained by reacting at least one epoxy resin (A) selected from glycidyl esters of divalent aliphatic carboxylic acids having 15 to 64 carbon atoms or glycidyl ethers of divalent aliphatic alcohols having 15 to 64 carbon atoms with a phosphorus atom-containing divalent phenol compound (B) as essential components, wherein the component (A) accounts for 2 to 52 mol % with respect to the whole resin, the weight average molecular weight thereof is 10,000 to 200,000, and the phosphorus content thereof is 1 to 5 wt %.