Non-leachable fire retardant comprising an alkaline condensation product of a fusible phenolic resin and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate
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.
Claims16
A non-leachable phosphorus containing flame retardant made by the alkaline condensation of a methylol phenol and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate at a temperature of at least about 250.degree. F.
A resin made by condensation of a fusible phenol-formaldehyde resin and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate in an alkaline medium at a temperature of at least about 250.degree. F.
A flame resistant material containing a non-leachable resin made by condensation of a fusible phenol-formaldehyde resin and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate in an alkaline medium at a temperature of at least about 250.degree. F.
Dependencies are inferred from the claim text.