Patent ID: 8182909

Claim:
A method for making an elastomeric polyurethane or polyurea coated viscoelastic polyurethane foam, the method comprising: applying to an uncoated viscoelastic polyurethane foam a water-borne elastomeric polyurethane or polyurea coating produced by: reacting a diisocyanate monomer selected from the group consisting of tetramethylxylylene diisocyanate, dicyclohexylmethane -4,4-diisocyanate, isophorone diisocyanate, and toluene diisocyanate with a polyol selected from the group consisting of polyether polyol and polyester polyol to form a prepolymer, reacting the prepolymer with a polyol, the polyol having at least one pendant carboxylic acid group, to form a prepolymer with a pendant carboxylic acid group, neutralizing the pendant carboxylic acid group with a tertiary amine selected from the group consisting of triethylamine, diethylamine, aminomethylpropanol, and dimethylethylamine, and then reacting the result with water or an organic or inorganic polyamine; and allowing the water-borne coating to cure, thereby creating a coated viscoelastic foam; wherein the coated viscoelastic polyurethane foam returns to its original volume after it has been deformed in a shorter amount of time than the amount of time required for the uncoated viscoelastic polyurethane foam to return to its original volume after it has been deformed.