The invention relates to a catalyst component for isocyanate modification, comprising at least one cyclic ammonium salt having a cation of the formula I wherein Y is a linear or branched C.sub.2-C.sub.20 segment which is substituted by a hydroxyl group in the 2 position to the charge-bearing nitrogen atom and optionally bears further substituents and is optionally interrupted by heteroatoms from the group of oxygen, sulfur, nitrogen and aromatic rings and optionally has further rings, and the N-bonded substituents R.sup.1 and R.sup.2 are either independently identical or different, substituted or unsubstituted, optionally branched, aliphatic C.sub.1-C.sub.20 radicals, aromatic C.sub.6-C.sub.20 radical or araliphatic C.sub.7-C.sub.20 radicals or the N-bonded substituents R.sup.1 and R.sup.2 form a ring segment X with one another for which the same or different definition given above for Y is applicable, with the proviso that X has a hydroxyl group as substituent in the 2 position to the charge-bearing nitrogen atom or does not have a hydroxyl group as substituent in the 2 position to the charge-bearing nitrogen atom.

The present invention relates to a process for the effective removal of residual monomeric aliphatic isocyanate from a reaction mixture comprising aliphatic polyisocyanate comprising (i) providing a reactor containing a scavenger comprising a zeolitic material, wherein the zeolitic material comprises SiO.sub.2 and optionally X.sub.2O.sub.3 in its framework structure, wherein X is a trivalent element; (ii) providing a reaction mixture comprising aliphatic polyisocyanate and monomeric aliphatic isocyanate; (iii) contacting the scavenger in the reactor with the reaction mixture provided in (ii) at a temperature lower than the boiling point of the residual monomeric aliphatic isocyanate for obtaining a product comprising aliphatic polyisocyanate with a reduced monomeric aliphatic isocyanate content, wherein if the zeolitic material comprises X.sub.2O.sub.3, the zeolitic material has an SiO.sub.2 to X.sub.2O.sub.3 molar ratio higher than 2.8:1, preferably higher than 5:1, more preferably higher than 30:1.

The present invention relates to the use of metal salts of polymeric alcohols as storage-stable thermolatent catalysts for the manufacture of isocyanurate and polyisocyanate polymers.

The present invention relates to a multi-aziridine compound having: a) at least 2 of the following structural units (A) whereby R.sub.1 is H; R.sub.2 and R.sub.4 are independently chosen from H, a linear group containing from 1 to 8 carbon atoms and optionally containing one or more heteroatoms, a branched or cyclic group containing from 3 to 8 carbon atoms and optionally containing one or more heteroatoms, phenyl, benzyl, or pyridinyl; R.sub.3 is chosen from a linear group containing from 1 to 8 carbon atoms and optionally containing one or more heteroatoms, a branched or cyclic group containing from 3 to 8 carbon atoms and optionally containing one or more heteroatoms, phenyl, benzyl, or pyridinyl; or R.sub.2 and R.sub.3 (in case R.sub.2 is different than H) may be part of the same cyclic group containing from 3 to 8 carbon atoms; R′ and R″ are independently H or an aliphatic hydrocarbon group containing from 1 to 12 carbon atoms; and b) a molecular weight of at least 600 Daltons, wherein the molecular weight is determined using MALDI-TOF mass spectrometry according to the description.

The invention relates to a process of preparing allophanate- and/or thioallophanate group-containing compounds comprising the following steps: reacting A) at least one component having at least one uretdione group with B) at least one component having at least one hydroxyl and/or thiol group, in the presence C) of at least one catalyst, containing a structural element of the general formulae (I) and/or (II), wherein R1, R2, R3, R4, R5 and R6 independently of each other represent the same or different radicals meaning saturated or unsaturated, linear or branched, aliphatic, cycloaliphatic, araliphatic or aromatic organic radicals with 1 to 18 carbon atoms that are substituted or unsubstituted and/or have heteroatoms in the chain, the radicals being capable of forming, even when combined with each other and optionally together with an additional heteroatom, rings with 3 to 8 carbon atoms that can optionally be further substituted, wherein R3, R4, R5 and R6 independently of each other also can represent hydrogen, and R7 represents hydrogen or a carboxylate anion (COO—), the at least one component A) having at least one uretdione group being polyaddition compounds A2) that can be obtained by reacting isocyanate-functional uretdione groups A1) with alcohols and/or amines that have a free isocyanate group content of less than 5 wt. % in their solvent-free form.

The invention relates to the use of at least one open-chain, optionally branched, ether isocyanate having an NCO functionality≥1, wherein 2 or 3 carbon atoms are present between at least one NCO group and at least one ether-oxygen atom, optionally in the presence of other reactants such as alcohols, amines, water, CO.sub.2, or of other reactants having an NCO functionality≥1, optionally in the presence of at least one catalyst, to increase the reaction speed and/or to reduce the optionally required catalyst amount during isocyanate modification. The invention further relates to a process for modifying isocyanates, to the modified isocyanates as such and to a two-component system or one-component system and to the moldings, coatings and composite parts obtainable therefrom.

The present invention relates to a two-component coating system comprising a first component and a second component each of which is separate and distinct from each other, wherein the first component comprises a carboxylic acid functional polymer dissolved and/or dispersed in an aqueous medium, and the second component comprises a multi-aziridine compound having: a) from 2 to 6 of the following structural units (A): b) whereby m is an integer from 1 to 8; and o R′ and R″ are both H b) one or more linking chains wherein each one of these linking chains links two of the structural units A; c) one or more connecting groups whereby each one of the connecting groups connects two of the structural units A; and d) a molecular weight in the range from 840 Daltons to 5000 Daltons, wherein the molecular weight is measured using MALDI-TOF mass spectrometry.

##STR00001##

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 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##