The invention relates to particles comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to mixtures comprising said particles. The invention further relates to aqueous dispersions comprising said particles. The invention further relates to aqueous compositions comprising said particles. The invention further relates to coating compositions comprising said particles. The invention further relates to aqueous coating compositions comprising said particles. The invention further relates to particles obtained by a process comprising—amongst others—the steps of providing an aqueous dispersion comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to a kit-of-parts comprising in one of its parts an aqueous dispersion comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to cured forms of the various particles, mixtures, aqueous dispersions, aqueous compositions, coating compositions, and aqueous coating compositions. The invention further relates to articles comprising the particles and/or said mixtures, and/or said aqueous dispersions and/or aqueous compositions and/or said cured forms. The invention further relates to various uses of the particles and/or said mixtures, and/or said aqueous dispersions and/or aqueous compositions and/or said cured forms.

The invention relates to particles comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to mixtures comprising said particles. The invention further relates to aqueous dispersions comprising said particles. The invention further relates to aqueous compositions comprising said particles. The invention further relates to coating compositions comprising said particles. The invention further relates to aqueous coating compositions comprising said particles. The invention further relates to particles obtained by a process comprising—amongst others—the steps of providing an aqueous dispersion comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to a kit-of-parts comprising in one of its parts an aqueous dispersion comprising a particular (aziridinyl hydroxy)-functional organic component. The invention further relates to cured forms of the various particles, mixtures, aqueous dispersions, aqueous compositions, coating compositions, and aqueous coating compositions. The invention further relates to articles comprising the particles and/or said mixtures, and/or said aqueous dispersions and/or aqueous compositions and/or said cured forms. The invention further relates to various uses of the particles and/or said mixtures, and/or said aqueous dispersions and/or aqueous compositions and/or said cured forms.

The present application relates to aziridine functional compounds with reduced genotoxicity and good crosslinking efficiency, for use in the preparation of, for example, coatings.

##STR00001##

The present application relates to aziridine functional compounds with reduced genotoxicity and good crosslinking efficiency, for use in the preparation of, for example, coatings.

##STR00001##

The present invention provides a chromium-free coating composition having high blackening resistance and corrosion resistance, the composition comprising: 20 to 70 wt % of waterborne silane modified polyurethane; 0.5 to 5 wt % of a hardener; 0.5 to 5 wt % of a blackening inhibitor; 0.5 to 5 wt % of a corrosion inhibitor; and 0.5 to 5 wt % of a lubricant, with the balance being a solvent. The chromium-free coating composition has the effect of improving blackening resistance, corrosion resistance, alkali resistance, solvent resistance and fingerprint resistance of a steel sheet on which a coating layer comprising the composition is formed.

The present invention provides a chromium-free coating composition having high blackening resistance and corrosion resistance, the composition comprising: 20 to 70 wt % of waterborne silane modified polyurethane; 0.5 to 5 wt % of a hardener; 0.5 to 5 wt % of a blackening inhibitor; 0.5 to 5 wt % of a corrosion inhibitor; and 0.5 to 5 wt % of a lubricant, with the balance being a solvent. The chromium-free coating composition has the effect of improving blackening resistance, corrosion resistance, alkali resistance, solvent resistance and fingerprint resistance of a steel sheet on which a coating layer comprising the composition is formed.

The present invention relates to an aqueous coating composition comprising dispersed polymer particles, wherein (i) the dispersed polymer particles are polyurethane-vinyl polymer hybrid particles obtained by free-radical polymerization of at least one vinyl monomer in the presence of a polyurethane, (ii) the polyurethane and the vinyl polymer in the hybrid particles are present in a weight ratio of polyurethane to vinyl polymer ranging from 1:1 to 20:1, (iii) the polyurethane is the reaction product of at least the following components: (a) from 5 to 40 wt. % of at least one organic difunctional isocyanate, (b) from 0.5 to 4 wt. % of an isocyanate-reactive compound containing ionic or potentially ionic water-dispersing groups having a molecular weight of from 100 to 500 g/mol, (c) from 40 to 80 wt. % of at least one diol having a molecular weight from 500 to 5000, (d) from 0 to 10 wt. % of at least one active-hydrogen chain extending compound with a functionality of at least 2 (other than water), (e) from 0 to 10 wt. % of at least one diol having a molecular weight below 500 g/mol, where the amounts of (a), (b), (c), (d) and (e) are given relative to the total amount of components used to prepare the polyurethane from which the building blocks of the polyurethane are emanated, and where the isocyanate and hydroxy groups on the components used to prepare the polyurethane are present in a respective mole ratio (NCO to OH) in the range of from 0.8:1 to 5:1, preferably from 1.05:1 to 5:1 and even more preferably from 1.1:1 to 3.5:1.

The present invention relates to an aqueous coating composition comprising dispersed polymer particles, wherein (i) the dispersed polymer particles are polyurethane-vinyl polymer hybrid particles obtained by free-radical polymerization of at least one vinyl monomer in the presence of a polyurethane, (ii) the polyurethane and the vinyl polymer in the hybrid particles are present in a weight ratio of polyurethane to vinyl polymer ranging from 1:1 to 20:1, (iii) the polyurethane is the reaction product of at least the following components: (a) from 5 to 40 wt. % of at least one organic difunctional isocyanate, (b) from 0.5 to 4 wt. % of an isocyanate-reactive compound containing ionic or potentially ionic water-dispersing groups having a molecular weight of from 100 to 500 g/mol, (c) from 40 to 80 wt. % of at least one diol having a molecular weight from 500 to 5000, (d) from 0 to 10 wt. % of at least one active-hydrogen chain extending compound with a functionality of at least 2 (other than water), (e) from 0 to 10 wt. % of at least one diol having a molecular weight below 500 g/mol, where the amounts of (a), (b), (c), (d) and (e) are given relative to the total amount of components used to prepare the polyurethane from which the building blocks of the polyurethane are emanated, and where the isocyanate and hydroxy groups on the components used to prepare the polyurethane are present in a respective mole ratio (NCO to OH) in the range of from 0.8:1 to 5:1, preferably from 1.05:1 to 5:1 and even more preferably from 1.1:1 to 3.5:1.

The present invention relates to a multi-aziridine crosslinker composition, characterized in that the multi-aziridine crosslinker composition is an aqueous dispersion having a pH ranging from 8 to 14 and comprises a multi-aziridine compound in dispersed form, wherein said multi-aziridine compound has: a. from 2 to 6 of the following structural units A: whereby R.sub.1 is H, R.sub.2 and R.sub.4 are independently chosen from H or an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, R a is an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, m is 1, b. one or more linking chains wherein each one of these linking chains links two of the structural units A; and c. a molecular weight in the range from 500 to 10000 Daltons wherein the molecular weight is determined using MALDI-TOF mass spectrometry according to the description.

##STR00001##

The present invention relates to a multi-aziridine crosslinker composition, characterized in that the multi-aziridine crosslinker composition is an aqueous dispersion having a pH ranging from 8 to 14 and comprises a multi-aziridine compound in dispersed form, wherein said multi-aziridine compound has: a. from 2 to 6 of the following structural units A: whereby R.sub.1 is H, R.sub.2 and R.sub.4 are independently chosen from H or an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, R a is an aliphatic hydrocarbon group containing from 1 to 4 carbon atoms, m is 1, b. one or more linking chains wherein each one of these linking chains links two of the structural units A; and c. a molecular weight in the range from 500 to 10000 Daltons wherein the molecular weight is determined using MALDI-TOF mass spectrometry according to the description.

##STR00001##