Permeable polymeric liner on absorbent pads
AssigneeRohm and Haas Company
InventorCharles E. Hoey
Life of this patent
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Abstract
A flexible, absorbent pad having a laminate structure comprising a top layer of a crushed foam of an addition polymer derived from an aqueous polymer latex, an underlying layer of liquid-absorbent material, and a bottom layer of a moisture-impervious film or a gauze. The addition polymer has a soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride.
Claims7
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material and a bottom film of flexible moisture-impervious material, the improvement in which said polymeric foam material is crushed foam of an addition polymer derived from an aqueous polymer latex, said addition polymer having a soft monomer component and a hard monomer component, said soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride, the thickness of the crushed layer being from about 1 mil to about 10 mils, and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material, and a bottom layer of a woven or non-woven gauze, wherein said polymeric foam material is crushed foam of an addition polymer comprising an acrylic monomer, the thickness of the crushed layer being from about 1 mil to about 10 mils and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
Dependencies are inferred from the claim text.