| 摘要 |
Wound covering material which is impermeable to bacteria and viruses, permeable to water vapor, pressure-sensitive and antiseptic. It comprises a backing and a pressure-sensitive adhesive layer containing as a glue an acrylate ester copolymer containing hydrophilic groups and/or a mixture of polyvinylmethyl and/or polyvinylethyl ethers. The backing layer is composed of a film of a segmented copolyether ester comprising 40-85% by weight of short-chain ester units, mainly based on 1,4-butylene glycol terephthalate, and long-chain ester units derived from a glycol having a molecular weight of 800 to 6000 and an atomic ratio of carbon to oxygen between 2.0 and 4.3, provided that at least 15% by weight and not more than 40% by weight of the long-chain ester units have an atomic ratio of carbon to oxygen between 2.0 and 2.4. The backing layer contains 1 to 15% by weight of iodine or 0.1 to 8% by weight of 1,6-bis(4-chlorophenyl-diguanido)hexane (i.e. chlorhexidene), calculated on the weight of the copolyetherester. The water vapor permeability of the backing and the adhesive layer together is at least 400 g/m2/24 hours in accordance with ASTM/-E96-66 [Procedure B; measured at 30 DEG C. and a DELTA RH of 50%]. |
