Patent ID: 7173070

Claim:
A method for manufacturing a foam cushion, the method comprising the steps of: (a) contacting with mixing and heating natural rubber, ethylene-vinyl acetate (EVA) copolymer, azodicarbonamide, an anhydride grafted polymeric adhesion modifier, and a combination of zinc oxide and stearic acid to form a first mixture; (b) contacting with mixing and heating the first mixture with dicumyl peroxide to form a second mixture; (c) dividing the second mixture into lumps; (d) heating further with mixing the separated lumps of the second mixture; (e) thinning a lump of the second mixture to form a sheet; (f) cooling the sheet; (g) stacking a plurality of the sheets in a press mold such that between 0% and 50% of the interior perimeter of the press mold remains exposed; (h) pressing the plurality of sheets in the press mold to form a cooked stack; and (i) slicing the cooked stack to provide the foam cushion.