Patent ID: 7338516

Claim:
A substrate that contains an exothermic coating at a solids add-on level of from about 20% to about 5000%, said exothermic coating comprising an oxidizable metal powder in an amount of from about 40 wt. % to about 95 wt. % of said coating, a carbon component in an amount from about 0.01 wt. % to about 20 wt. % of said coating, a binder in an amount from about 0.01 wt. % to about 20 wt. % of said coating, an electrolytic salt in an amount from about 0.01 wt. % to about 10 wt. % of said coating, and moisture-retaining particles in an amount from about 0.01 wt. % to about 30 wt. % of said coating, wherein the binder comprises a polymer latex, wherein the polymer latex is sufficiently crosslinked to be substantially insoluble in water, wherein said exothermic coating is capable of activation in the presence of oxygen and moisture to generate heat, and wherein said exothermic coating is generally free of water prior to activation.