Mixing system for producing aqueous repair coating products, method for the production thereof, and aqueous repair coating products produced from the mixing system

A mixer system for producing aqueous refinish compositions, the mixer system comprising:

• at least one component (1) as pigment-free base varnish, comprising at least one physically curing polyurethane or a self-crosslinking polyurethane or an externally crosslinking polyurethane;
• at least one component (2) as tinting base, comprising at least one physically drying polyurethane or a self-crosslinking polyurethane or an externally crosslinking polyurethane and at least one color-imparting and/or optical-effect-imparting pigment;
• and
• at least one component (3) as rheology module, comprising at least one inorganic and/or organic thickener,
• wherein at least one of the components, (1), (2), or (3), comprises an aqueous dispersion comprising at least one seed core shell polymer, and wherein at least one of the components, (1), (2), or (3), comprises at least one aliphatic monoalcohol having 5 carbon atoms and/or at least one aliphatic monoalcohol having 6 carbon atoms,
• the aqueous dispersion being prepared by the successive radical emulsion polymerization of three mutually different monomer mixtures (A), (B), and (C) of olefinically unsaturated monomers,
• wherein optionally at least one of the monomer mixtures, (A), (B) or (C), comprises at least one polyurethane (P) containing at least one olefinically unsaturated group, and
• wherein, the optional polyurethane (P), if present, is admixed to at least one of the monomer mixtures (A), (B) or (C),
• the monomer mixture (A) comprises at least 50 wt % of monomers having a solubility in water of less than 0.5 g/l at 25° C., and a polymer (a) that is prepared from the mixture (A) possesses a glass transition temperature of 10 to 65° C.,
• the monomer mixture (B) comprises at least one polyunsaturated monomer, and a polymer (b) that is prepared from the mixture (B) possesses a glass transition temperature of −35 to 15° C., and
• a polymer (c) that is prepared from the monomer mixture (C) possesses a glass transition temperature of −50 to 15° C.,
• and wherein
• i. first the monomer mixture (A) is polymerized,
• ii. then the monomer mixture (B) is polymerized in the presence of the polymer prepared under i., and
• iii. thereafter the monomer mixture (C) is polymerized in the presence of the polymer prepared under ii.