Durable exothermic coating
AssigneeKimberly-Clark Worldwide, Inc.
InventorsRoger Bradshaw Quincy, III, Kelly Dean Branham
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Abstract
A substrate that contains an exothermic coating is provided. More specifically, the exothermic coating includes one or more components (e.g., carbon, oxidizable metal, moisture-retaining particles, etc.) that are durably adhered to the substrate. To provide the desired durability, the exothermic coating includes the combination of a certain amount of a polymer latex and polysaccharide. When appropriately selected and incorporated into the exothermic coating, the present inventors have discovered that these components may interact synergistically to improve binding capacity.
Claims24
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.
A thermal device comprising 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.
Dependencies are inferred from the claim text.