Polyisocyanate-based intumescent coating
First Claim
1. An intumescent coating composition comprising (i) 20% by weight to 90% by weight based on the coating composition of a polyurethane binder resin that is the reaction product of a reactive mixture consisting of a polyisocyanate compound and a polyfunctional isocyanate-reactive compound selected from the group consisting of a polycarbonate polyol, a polycaprolactone polyol, a polytetramethylene ether glycol, or combinations thereof, and (ii) an intumescent filler package, wherein the intumescent filler package contains at least one or more compounds containing a phosphorus atom, a nitrogen atom and a boron atom and the weight ratio of phosphorus to nitrogen in said intumescent filler package is between 0.8/1 to 1.5/1 and the amount of boron is from 1 wt % to 5 wt % based on the coating composition;
- and wherein the polyisocyanate is a prepolymer compound having an average functionality of 2.0 to 2.9 and a maximum viscosity of 6000 mPa S′
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Abstract
Intumescent coating composition comprising a polyisocyanate, a polyfunctional isocyanate-reactive compound and an intumescent ingredient, wherein the intumescent ingredient contains at least one or more compounds containing phosphorus, nitrogen and boron atoms and the weight ratio phosphorus to nitrogen in said intumescent ingredient is between 0.5/1 to 1.5/1 and the amount of boron is from 1 to 5 wt % based on the coating composition.
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Citations
12 Claims
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1. An intumescent coating composition comprising (i) 20% by weight to 90% by weight based on the coating composition of a polyurethane binder resin that is the reaction product of a reactive mixture consisting of a polyisocyanate compound and a polyfunctional isocyanate-reactive compound selected from the group consisting of a polycarbonate polyol, a polycaprolactone polyol, a polytetramethylene ether glycol, or combinations thereof, and (ii) an intumescent filler package, wherein the intumescent filler package contains at least one or more compounds containing a phosphorus atom, a nitrogen atom and a boron atom and the weight ratio of phosphorus to nitrogen in said intumescent filler package is between 0.8/1 to 1.5/1 and the amount of boron is from 1 wt % to 5 wt % based on the coating composition;
- and wherein the polyisocyanate is a prepolymer compound having an average functionality of 2.0 to 2.9 and a maximum viscosity of 6000 mPa S′
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- and wherein the polyisocyanate is a prepolymer compound having an average functionality of 2.0 to 2.9 and a maximum viscosity of 6000 mPa S′
Specification