Aqueous polymer/polyurethane resin binder vehicle dispersion and the production thereof, and coating media and the use thereof

An aqueous binder vehicle dispersion for coating media obtained by the joint reaction of:

• I. 20 to 97% by weight of one or more resins selected from the group consisting of polyurethane resins and polyurethane-urea resins containing at least one group which is reactive towards a chain extender IV), having a number average molecular weight (Mn) of 1000 to 10,000 and 8 to 80 milliequivalents per 100 g solid resin of one or more groups selected from ionic groups, groups which can be converted into ionic groups and hydrophilic groups,
• II. 0 to 30% by weight of one or more polyester resins having a number average molecular weight (Mn) of 500 to 5000, and having two or more of the same groups as in I) which are reactive towards the chain extender IV), and
• III. 3 to 80% by weight of one or more (meth)acrylic copolymers containing 0 to 40 milliequivalents per 100 g solid resin of ionic groups with the same charge as in component I) or groups which can be converted into such groups and/or hydrophilic groups, having at least two of the same groups as in I) and II) which are reactive towards the chain extender IV),
• wherein the sum of the percentages by weight of components I) to III) is 100% by weight,
• and wherein at least 50% by weight of component III) with respect to the total amount of component III) has been produced in the presence of one or more of components I) and/or II), corresponding to at least 20% by weight of the total amount of the sum of components I) and II), with
• IV. one or more chain extenders IV) which comprise two or more reactive groups which are reactive with the reactive groups of components I), II), and III),
• neutralisation of at least part of the groups which are optionally present and which can be converted into ionic groups, and conversion into the aqueous phase, wherein the reactive groups in I, II and III are alkoxysilane groups or isocyanate groups and water is used as the chain extender IV.