Copolymer dispersions, binder combinations based on copolymer dispersions, process for preparing the same and using the same

A water dispersible and/or soluble copolymer (A), hardenable in combination with crosslinking resins, comprises a hydroxy functional, hydrophobic copolymer, a hydroxyfunctional, hydrophilic-hydrophobic copolymer and optionally a hydroxy functional, hydrophobic copolymer. A water dispersible and/or soluble copolymer (A), hardenable in combination with crosslinking resins, comprises: (A1) a hydroxy functional, hydrophobic copolymer containing (A1a) 30-95 wt.% (meth)acrylic acid ester with 1-18C hydrocarbon residues in the alcohol and/or vinyl aromatics and/or vinyl esters, (A1b) 5-45 wt.% hydroxyfunctional monomers; (A2) a hydroxyfunctional, hydrophilic-hydrophobic copolymer containing (A2a) 4-20 wt.% (meth)acrylic acid ester with 1-18C hydrocarbon in the alcohol and/or vinyl aromatics and/or vinylesters, (A2b) 4-15 wt.% hydroxyfunctional monomers, (A2c) 0.8-3.0 wt.% acid functional monomers, and optionally (A3) a hydroxy functional, hydrophobic copolymer containing (A3a) 0-16 wt.% hydroxy- and non-functionalized (meth)acrylic acid esters and/or vinyl aromatics. (A) has an acid number of 10-28 mg KOH/g. (A2) contains less than 25 wt.% (A2c). The content of (A2b) in (A2) is greater than the amount of (A1b) in (A1). Independent claims are included for (i) a process for the production of (A) by radical initiated copolymerisation of (A1), (A2) and optionally (A3) in a solvent mixture (B) comprising (B1) 30-95 wt.% of a non-saponifiable, non-water miscible, hydrophobic solvent and (B2) 5-70 wt.% of a non-saponifiable, water-miscible, hydrophilic solvent; and (ii) an aqueous binding agent composition comprising 65-90 wt.% (A) and 10-35 wt.% of an aminoplast resin crosslinking agent. Die Erfindung betrifft wäßrige, durch Kombination mit Vernetzerharzen aushärtbare Copolymerisatdispersionen, ein Verfahren zu deren Herstellung und deren Verwendung. A water dispersible and/or soluble copolymer (A), hardenable in combination with crosslinking resins, comprises a hydroxy functional, hydrophobic copolymer, a hydroxyfunctional, hydrophilic-hydrophobic copolymer and optionally a hydroxy functional, hydrophobic copolymer. A water dispersible and/or soluble copolymer (A), hardenable in combination with crosslinking resins, comprises: (A1) a hydroxy functional, hydrophobic copolymer containing (A1a) 30-95 wt.% (meth)acrylic acid ester with 1-18C hydrocarbon residues in the alcohol and/or vinyl aromatics and/or vinyl esters, (A1b) 5-45 wt.% hydroxyfunctional monomers; (A2) a h