Non-leachable fire retardant
AssigneeMasonite Corporation
InventorsChun Y. Lo, Thomas A. Lehtinen
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Abstract
A fusible phenolic resin and a dialkyl-N, N-bis (hydroxyalkyl) aminoalkyl phosphonate are condensed to form a water-insoluble resin having fire retardant properties. Fire resistant materials are made by causing the condensation to occur in situ when a normally flammable material and the reactants are mixed and the mixture is heated at 250.degree. F. to 480.degree. F. Wooden articles such as molded hardboard roofing shingles of this invention do not lose their fire resistance after being soaked with rain repeatedly.
Claims3
A flame resistant material containing a non-leachable resin made by condensation of a fusible phenol-formaldehyde resin and diethyl-N,N-bis(hydroxyethyl)aminomethyl phosphonate in an alkaline medium at a temperature of at least about 250.degree. F.
Dependencies are inferred from the claim text.