The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1987
Filed:
Oct. 11, 1985
Cornelius M Vrouenraets, Dieren, NL;
Akzo nv, Arnhem, NL;
Abstract
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/m.sup.2 /24 hours in accordance with ASTM/-E96-66 [Procedure B; measured at 30.degree. C. and a .DELTA.RH of 50%].