This invention relates to a coating composition, a method for coating of a metallic substrate as well as the use of a chain-extended aspartate prepolymer for improving the early hardness of the coating composition and in a two-component coating composition.

This invention relates to a coating composition, a method for coating of a metallic substrate as well as the use of a chain-extended aspartate prepolymer for improving the early hardness of the coating composition and in a two-component coating composition.

A urethane compound (A) including units formed from (A1) an isocyanate and (A2) a long-chain alcohol represented by the formula HOZ(YR).sub.n [wherein the R moieties are each independently O, NH, OC(O), NHC(O), C(O)NH, OC(O)NH, NHC(O)O, NHC(O)NH, NHS(O).sub.2, S(O).sub.2NH, NH(CH.sub.2).sub.mNHS(O).sub.2, NH(CH.sub.2).sub.mS(O).sub.2NH, etc. (m is an integer of 1-5), Z is a direct bond or a di- or trivalent hydrocarbon group having 1-5 carbon atoms, and n is 1 or 2]. Also disclosed is a urethane mixture containing the urethane compound (A), and at least one selected from the polyisocyanate (A1), the long-chain alcohol (A2), a blocking agent (A3) and an alcohol compound (A4); an aqueous urethane composition; a method for producing the aqueous urethane composition; a method of treating a substrate; and a treated textile product.

The invention relates to an aqueous resin dispersion comprising a mixture of a hydrophilically modified epoxy-based resin, a crosslinker, and a co-crosslinker. The present invention also relates to an aqueous coating composition, comprising said resin dispersion, providing improved corrosion and discolouration resistance; to a process for the preparation of the aqueous resin dispersion and the coating composition; and to the use of the coating composition for coating metal substrates.