Abstract: A disposable bandage, and a process for manufacturing it, which is prepared from a single sheet or strip of liquid permeable, flexible thermoplastic hydrophilic foam. The process includes coating the entire surface of one side of a foam sheet or strip with a layer of porous pressure sensitive adhesive, covering the same side of the laminate with a suitable release liner and heat compressing the laminate except in the area of the laminate intended for wound contact. The foam bandage so produced includes both a resilient absorbent pad and thin but absorbent adhesive-coated tabs and is suitable for use as an occlusive dressing. Optionally, the bandage may have a moisture vapor permeable, moisture impermeable skin thereon, to provide a water- andbacteria-proof protective outer layer for the foam bandage.

Abstract: A method of mechanically frothing and casting an aqueous polyurethane dispersion yields a foam which, when rolled, wound or stacked, is self-releasing from the pressure sensitive adhesive layer co-cured therewith. The method includes admixing an aqueous ionic polyurethane dispersion with a stearate stabilizer and an optional aziridine crosslinking agent, frothing and casing the admixture, and co-curing the resultant foam sheet with a pressure sensitive adhesive layer. Before frothing, the polyurethane dispersion contains particles having an average size of less than one micron, and contains between 35 and 70 percent by weight of the polyurethane dispersion, between 13 and 50 percent by weight of a 33 percent by weight dispersion of a stearate salt, and up to 33 percent by weight of polyfunctional aziridine.

Abstract: A disposable bandage, and a process for manufacturing it, which is prepared from a single sheet or strip of liquid permeable, flexible thermoplastic hydrophilic foam. The process includes coating the entire surface of one side of a foam sheet or strip with a layer of porous pressure sensitive adhesive, positioning wound release material in the area of the sheet or strip intended for wound contact, covering the same side of the laminate with a suitable release liner and heat compressing the laminate except at the locus of the wound release material. The foam bandage so produced includes both a resilient absorbent pad and thin but absorbent adhesive-coated tabs. Optionally, the bandage may have a moisture vapor permeable, moisture impermeable skin thereon, to provide a water- and bacteria-proof protective outer layer for the foam bandage.