Phenol-formaldehyde intumescent coating composition and coating prepared therefrom
AssigneeUniversity of Dayton
InventorsIval O. Salyer, Bernard L. Fox
Life of this patent
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Abstract
Intumescent coatings which form a thick, uniform, fine celled, low density foam upon exposure to a high intensity heat flux or flame are disclosed, the invention coatings comprise phenolic resin prepolymer containing a blowing agent and a nucleating agent; in the preferred embodiments the coatings also contains a silicone surfactant, the coatings are useful in thermal and fire protection systems.
Claims33
An intumescent coating consisting essentially of phenol-formaldehyde prepolymer, a blowing agent, and a nucleating agent dispersed in said prepolymer, said prepolymer being soluble in acetone and dichloromethane in an amount greater than 10 percent by weight and being solid at room temperature (23.degree. C.), and said coating being characterized in that it is unfoamed in its coated condition and it is foamable in situ to a flame and heat resistant foam upon exposure to intense heat flux or flame.
A flame-resistant substrate having an intumescent coating on the surface thereof, said coating consisting essentially of a phenol-formaldehyde prepolymer, a blowing agent, and a nucleating agent dispersed in said prepolymer, said prepolymer being soluble in acetone and dichloromethane in an amount greater than 10 percent by weight and being solid at room temperature (23.degree. C.), and said coating being characterized in that it is unfoamed in its coated condition and is foamable in situ to a flame and heat resistant foam upon exposure to intense heat flux or flame.
An intumescent coating composition consisting essentially of a phenol-formaldehyde prepolymer, a solvent for said prepolymer, a blowing agent and a nucleating agent dispersed in said prepolymer, said prepolymer being soluble in acetone and dichloromethane in an amount greater than 10 percent by weight and being solid at room temperature (23.degree. C.), and said composition being characterized in that when it is coated upon a substrate and said solvent is evaporated, it forms an unfoamed coating which is foamable in situ to a flame and heat resistant foam upon exposure to intense heat flux or flame.
A process for rendering a substrate heat and fire resistant which consists essentially of coating the surface of said substrate with an intumescent coating without foaming said coating, said coating consisting essentially of a phenol-formaldehyde prepolymer, a solvent for said prepolymer, a blowing agent and a nucleating agent dispersed in said prepolymer, said prepolymer being soluble in acetone and dichloromethane in an amount greater than 10 percent by weight and being solid at room temperature (23.degree. C.), and said coating being characterized in that it is unfoamed in its coated condition and it is foamable in situ to a heat and fire resistant foam upon exposure to intense heat flux or flame.
Dependencies are inferred from the claim text.