Contact adhesive product based on polyurethane resin, production thereof, and corresponding contact adhesive

Abstract

The invention relates to a contact adhesive product, comprising a substrate and a polyurethane resin, which can be obtained by reacting at least A) an aliphatic polyisocyanate component having an average isocyanate functionality of ≥1.8 and ≤2.6, B) a polymeric polyether polyol component, C) an amino-functional chain extender component having at least 2 isocyanate-reactive amino groups, containing at least one amino-functional connection C1), which has no ionic or ionogenic group and/or an amino-functional compound C2), which has ionic or ionogenic groups, D) possibly further hydrophilic components which are different from C2), E) possibly hydroxy-functional compounds having a molecular weight of 62 to 399 mol/g, F) possibly further polymeric polyols which are different from B), G) a compound, which has precisely one isocyanate-reactive group, or a compound, which has more than one isocyanate-reactive group, wherein only one of the isocyanate-reactive groups reacts under the selected reaction conditions with the isocyanate groups present in the reaction mixture, and H) possibly an aliphatic polyisocyanate component having an average isocyanate functionality of >2.6 and ≤4, wherein the components B) and F) together contain ≤30 wt % on component F), based on the total mass of the components B) and F). The invention further relates to a method for producing the contact adhesive product, to a special polyurethane resin, and to a contact adhesive comprising said polyurethane resin.