Watervapour-permeable, pressure sensitive, antiseptic wound covering material

Claim 1

Pressure sensitive, antiseptic wound covering material impermeable to bacteria and viruses, but permeable to watervapour, comprising a substrate of a synthetic polyme and a pressure sensitive adhesive layer on at least the part of the substrate to be stuck to the skin, in which adhesive layer there is incorporated as adhesive a hydrophilic groups-containing acrylate ester copolymer and/or a mixture of polyvinyl methyl ethers and/or polyvinylethyl ethers, characterized in that the substrate and the adhesive layer together have a water vapour permeability of at least 400 g/m 2 /24 hours in accordance with ASTM/E96-66 [Procedure B; measured at 30°C and a ΔRH of 50%], the substrate is a film of a copolyetherester consisting of a multiplicity of repeating intralinear long-chain and short-chain ester units which are randomly joined head to tail through ester linkages, which long-chain ester units correspond to the formula and-which short-chain ester units correspond to the formula where G represents a divalent radical which remains after the removal of terminal hydroxyl groups from at least one long-chain glycol having a molecular weight of 800 to 6000 and an atomic ratio of carbon to oxygen of 2,0 to 4,3 R represents a divalent radical remaining after removal of carboxyl groups from at least one carboxylic acid having a molecular weight less than 300, and D represents a divalent radical remaining after removal of hydroxyl groups from at least one diol having a molecular weight less than 250, and at least 80 mole % of the dicarboxylic acid used are terephthalic acid or the ester forming equivalents thereof and at least 80 mole % of the low-molecular weight diol 1,4-butane diol or the ester forming equivalents thereof, with the sum of the mole percentages of the dicarboxylic acid which is not terephthalic acid or the ester forming equivalents thereof and of the low-molecular weight diol which is not 1,4-butanediol or the ester forming equivalent thereof not exceeding 20, and the short-chain ester units form 40-85% by weight of the copolyetherester, at least 15% by weight and not more than 40% by weight of the copolyetherester is formed by long-chain ester units in which the long-chain glycol has a carbon to oxygen ratio of 2,0 to 2,4, and the copolyether ester film contains 1 to 15% by weight of iodine or 0,1 to 8% by weight of 1,6-bis(4-chlorophenyl-diguanido)hexane, calculated on the weight of the copolyetherester.