Water-based physically drying coating agents, manufacture and use thereof

A method for producing a physically drying water-based coating agent, characterised in that a binder component A) in the form of polyurethanes containing one or more carbonate groupings and having a glass transition temperature of <0.degree. C. in the form of an aqueous dispersion produced by reacting:

• a) 10 to 40 wt. % of one or more organic polyisocyanates not containing any hydrophilic groups or groups convertible into hydrophilic groups,
• b) 40 to 80 wt. % of one or more higher-molecular organic polyhydroxyl compounds not containing any hydrophilic groups or groups convertible into hydrophilic groups and containing at least 50 wt. % of one or more polyhydroxy polycarbonates,
• c) 0.2 to 18 wt. % of one or more low-molecular compounds containing at least two groups capable of reacting with isocyanate groups but not containing any hydrophilic groups or groups convertible into hydrophilic groups,
• d) 0 to 8 wt. % of one or more non-ionic hydrophilic compounds containing at least one isocyanate group or at least one group capable of reacting with isocyanate groups, and
• e) 1 to 12 wt. % of one or more compounds containing at least one ionic group or at least one group convertible into an ionic group and at least one hydrogen atom capable of reacting with isocyanate groups, is admixed with a binder component B) produced by reacting carboxy-functional polycondensates and .alpha.,.beta.-olefinically unsaturated monomers and having a glass transition temperature of >0.degree. C. and in the form of an aqueous dispersion produced by the reaction of:
• i) 5 to 95 wt. % of a carboxy-functional polycondensate containing additional epoxy groups,
• ii) 95 to 5 wt. % of at least one copolymerisable .alpha.,.beta.-olefinically unsaturated monomers, and
• iii) 0 to 20 wt. % of adjuvants for polymer manufacture, the quantitative proportions of components i) to iii) relating to the content of solids in component b) and their sum always being 100 wt. %,
• and 10 to 90 wt. % of component A) being mixed with 10 to 90 wt. % of component B), the percentage weights of components A) and B) referring to each case to the solids in the binder and adding up to 100 wt. %, and
• 5 to 30 wt. % of mixture of binders A) and B) is mixed with
• 40 to 85 wt. % water,
• 1 to 20 wt. % of one or more organic solvents,
• 2 to 25 wt. % of one or more colouring and/or decorative pigments, and
• a neutralising agent in an amount of from 40 to 120% in the neutralizable groups in the binder.