Patent ID: 6063498
Filing Date: 2000-05-16
Classification: A61L,C08G,D04H,D06M,Y10T

Abstract:
A process for producing sterile nonwovens, which comprises a textile fabric composed of a fiber web being impregnated with an aqueous dispersion comprising a polyurethane, then dried and irradiated with .gamma.-rays, wherein the polyurethane used is polymerized froma) diisocyanates having from 4 to 30 carbon atoms,b) diols, of whichb1) from 10 to 100 mol %, based on total diols (b), have a molecular weight within the range from 500 to 5000, andb2) from 0 to 90 mol %, based on total diols (b), have a molecular weight within the range from 60 to 500 g/mol,c) monomers of the formula (d1)H.sub.2 N--R.sup.4 --NH--R.sup.5 --X (d1)whereR.sup.4 and R.sup.5 are independently a C.sub.1 -C.sub.6 -alkanediyl unit,and X is COOH or a carboxylate group in the form of their salts with an alkali metal ion or an ammonium ion as counterion,d) optionally further polyfunctional compounds which differ from said monomers (a) to (c) and have reactive groups comprising alcoholic hydroxyl groups, primary or secondary amino groups or isocyanate groups, ande) optionally monofunctional compounds which differ from said monomers (a) to (d) and have a reactive group comprising an alcoholic hydroxyl group, a primary or secondary amino group or an isocyanate group.