Patent ID: 7686840

Claim:
A substrate containing an exothermic coating that is activatable to generate heat, wherein the exothermic coating is present at a solids add-on level of from about 20% to about 5000%, the exothermic coating comprising an oxidizable metal, a polymer latex and polysaccharide, the polymer latex having a glass transition temperature of about 30° C. or less, wherein the polymer latex constitutes from about 0.01 wt. % to about 20 wt. % of the exothermic coating and the polysaccharide constitutes from about 0.01 wt. % to about 20 wt. % of the exothermic coating, further wherein the weight ratio of the polymer latex to the polysaccharide is from about 0.5:1 to about 5:1, wherein the polymer latex is crosslinked and substantially insoluble in water, and wherein the exothermic coating is generally free of liquid water prior to activation.