Polymer blend films
AssigneeSmith and Nephew Associated Companies Limited
InventorsPeter J. Metcalfe, Andrew J. Carter
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Abstract
A moisture vapor transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids characterized in that the blend comprises a continuous matrix of ethylene vinyl acetate within which the incompatible polymer forms a discrete particulate phase matrix, processes for the preparation thereof and articles comprising these films are described.
Claims15
A moisture vapor transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids within the film, said voids not providing a continuous pathway through the film, and wherein the blend comprises a continuous matrix ethylene-vinyl acetate copolymer within which the incompatible polymer forms a discrete particulate phase.
A wound dressing or hygenic absorbent pad which comprises a moisture vapor transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids within the film, said voids not providing a continuous pathway through the film, and wherein the blend comprises a continuous matrix of ethylene-vinly acetate copolymer within which the incompatible polymer forms a discrete particulate phase.
A process for producing a moisture vapor transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids within the film, said voids not providing a continuous pathway through the film, and wherein the blend comprises a continuous matrix of ethylene-vinyl acetate copolymer within which the incompatible polymer forms a discrete particulate phase, which process comprises forming a film from the blend of ethylene-vinyl acetate and incompatible polymer, cold drawing the film until voiding occurs and allowing the drawn film to contract.
Dependencies are inferred from the claim text.