Binder composition and its use for the production of a coating or sealing composition

A process for the production of a coating or sealing composition containing an aqueous binder composition which comprises

• i) emulsifying a polyisocyanate component B) having a viscosity at 23.degree. C. of 50 to 10,000 mPa.s and containing at least one organic polyisocyanate in an aqueous solution or dispersion of a water-dilutable organic polyol component A) containing
• A1) at least one water-dilutable polyester resin containing sulfonate and hydroxyl groups and having a molecular weight (M.sub.n) of 500 to 50,000, an OH number 20 to 240 mg KOH/g, a content of sulfonate groups (--SO.sub.3.sup.-) of 4 to 70 milliequivalents per 100 g of polyester resin and a content of carboxylate groups (--COO.sup.-) of 0 to 40 milliequivalents per 100 g of polyester resin and
• A2) optionally a reactive thinner containing at least one water-soluble monohydric or polyhydric alcohol which has a molecular weight (M.sub.n) below 500 and which is non-distillable at normal pressure or has a boiling point of at least 150.degree. C.,
• at an NCO:OH equivalent ratio of components A) and B) of 0.5:1 to 5:1 and
• ii) incorporating any optional auxiliaries and additives in the solution or dispersion A) before the addition of the polyisocyanate component.

An aqueous binder composition comprising

• A) an aqueous solution or dispersion of a water-dilutable organic polyol component comprising
• A1) at least one water-dilutable polyester resin containing sulfonate and hydroxyl groups and having a molecular weight (M.sub.n) of 500 to 50,000, an OH number of 20 to 240 mg KOH/g, a content of sulfonate groups (--SO.sub.3.sup.-) of 4 to 70 milliequivalents per 100 g of polyester resin and a content of carboxylate groups (--COO.sup.-) of 0 to 40 milliequivalents per 100 g of polyester resin and
• A2) optionally a reactive thinner containing at least one water-soluble monohydric or polyhydric alcohol which has a molecular weight (M.sub.n) below 500 and which is non-distillable at normal pressure or has a boiling point of at least 150.degree. C., and
• B) a non-hydrophilic polyisocyanate component which is emulsified in the aqueous solution or dispersion A), has a viscosity at 23.degree. C. of 50 to 10,000 mPa.s and contains at least one organic polyisocyanate,
• wherein components A) and B) are present at an NCO:OH equivalent ratio of 0.5:1 to 5:1.

An aqueous binder composition comprising

• A) an aqueous solution or dispersion of one or more water-dilutable organic polyols which do not contain urethane groups and which comprise
• A1) at least one water-dilutable polyester resin containing sulfonate and hydroxyl groups and having a molecular weight (M.sub.n) of 500 to 50,000, an OH number of 20 to 240 mg KOH/g, a content of sulfonate groups (--SO.sub.3.sup.-) of 4 to 70 milliequivalents per 100 g of polyester resin and a content of carboxylate groups (--COO.sup.-) of 0 to 40 milliequivalents per 100 g of polyester resin and
• A2) optionally a reactive thinner containing at least one water-soluble monohydric or polyhydric alcohol which has a molecular weight (M.sub.n) below 500 and which is non-distillable at normal pressure or has a boiling point of at least 150.degree. C., and
• B) a polyisocyanate component which is emulsified in the aqueous solution or dispersion A), has a viscosity at 23.degree. C. of 50 to 10,000 mPa.s and contains at least one organic polyisocyanate,
• wherein components A) and B) are present at an NCO:OH equivalent ratio of 0.5:1 to 5:1.

An aqueous binder composition comprising

• A) an aqueous solution or dispersion of one or more water-dilutable organic polyols which do not contain urethane groups and which comprise
• A1) at least one water-dilutable polyester resin containing sulfonate and hydroxyl groups and having a molecular weight (M.sub.n) of 500 to 50,000, an OH number of 20 to 240 mg KOH/g, a content of sulfonate groups (--SO.sub.3.sup.-) of 4 to 70 milliequivalents per 100 g of polyester resin and a content of carboxylate groups (--COO.sup.-) of 0 to 40 milliequivalents per 100 g of polyester resin and
• A2) optionally a reactive thinner containing at least one water-soluble monohydric or polyhydric alcohol which has a molecular weight (M.sub.n) below 500 and which is non-distillable at normal pressure or has a boiling point of at least 150.degree. C., and
• B) a non-hydrophilic polyisocyanate component which is emulsified in the aqueous solution or dispersion A), has a viscosity at 23.degree. C. of 50 to 10,000 mPa.s and contains at least one organic polyisocyanate,
• wherein components A) and B) are present at an NCO:OH equivalent ratio of 0.5:1 to 5:1.