Abstract: An alkyd resin is provided wherein the alkyd resin is obtainable by polymerization of reaction components comprising a polybasic acid, a polyhydric alcohol, and unsaturated fatty acids, or by further reacting such alkyd resin with a polyurethane prepolymer with emulsifying groups. Also provided are a coating composition comprising such alkyd resin as binder polymer, and a substrate coated with such coating composition.

Abstract: The invention relates to alkyd resin obtainable by polymerization of reaction components comprising: (a) a polybasic acid; (b) a polyhydric alcohol; (c) an unsaturated fatty acid comprising in the range of from 12 to 24 carbon atoms; and (d) optionally a monocarboxylic acid other than an unsaturated fatty acid comprising in the range of from 12 to 24 carbon atoms and other than a polyhydric alcohol, wherein at least part of the polybasic acid (a) and/or of the monocarboxylic acid (d) is a 1-substituted-5-oxopyrrolidine-3-carboxylic acid obtainable by reacting itaconic acid with a primary amine group of an amine, wherein the amine comprises an aromatic or non-aromatic cyclic group. The invention further relates to a polyurethane-polyester hybrid alkyd resin obtainable by reacting the above alkyd resin with a polyurethane prepolymer with emulsifying groups.