Abstract: Powder coating compositions for low temperature cure between 100° C. and 150° C. The powder coating compositions contain: a) a carboxylic acid functional resin A which is a polyester resin A having carboxylic acid groups, b) a first glycidyl functional resin B1 which is a bisphenol A based epoxy resin having glycidyl groups, c) a second glycidyl functional resin B2 which is a phenol or cresol epoxy novolac resin having glycidyl groups, and d) at least one thermosetting curing catalyst C. Such powder coating compositions may exhibit, upon curing, an excellent combination of physical properties such as smoothness, flexibility, hardness and, above all, an outstanding durability for the MEK impregnation test.

Abstract: The present invention relates to powder coating compositions for low temperature cure between 100° C. and 150° C. The powder coating composition comprises: a) a carboxylic acid functional resin A which is a polyester resin A having carboxylic acid groups, b) a first glycidyl functional resin B1 which is a bisphenol A based epoxy resin having glycidyl groups, c) a second glycidyl functional resin B2 which is a phenol or cresol epoxy novolac resin having glycidyl groups, and d) At least one thermosetting curing catalyst C. Such powder coating composition may exhibit, upon curing, an excellent combination of physical properties such as smoothness, flexibility, hardness and, above all, an outstanding durability for the MEK impregnation test.

Abstract: This invention relates to a process to make a reaction product UA of at least one multifunctional aldehyde A with at least one cyclic urea U, by mixing the at least one multifunctional aldehyde A with the at least one cyclic urea U in the presence of at least one alcohol R1—OH, and optionally, at least one solvent that has no reactive groups which may react with aldehyde groups, —CO—NH— groups, or hydroxyl groups, to effect an addition reaction to obtain a solution of a product UA, where R1 is selected from the group consisting of linear, branched or cyclic alkyl groups having from one to twelve carbon atoms, to the reaction product obtained by this process, and to a method of use thereof as crosslinker for coating compositions.

Abstract: The invention relates to a process for the synthesis of N-substituted cyclic alkylene ureas by reacting a multifunctional aliphatic amine A having at least two amino groups which may be primary or secondary, at least one of which is a primary amino group, —NH2, and at least one of which is a secondary amino group, >NH, the other hydrogen group whereof having been substituted by a hydrocarbyl group which in turn may be substituted by a hydroxyl group, or an amino group, or a carboxyl group, or a ketone carbonyl group, or a hydrazide or hydrazone group, or a mercaptan group, and at least one further functional group selected from the group consisting of primary or secondary amino groups and hydroxyl groups, and an aliphatic organic carbonate component C selected from the group consisting of dialkyl carbonates CD and of alkylene carbonates CA.

Abstract: The invention relates to a process for the synthesis of cyclic alkylene ureas comprising reacting in the presence of a basic catalyst, a difunctional amine A having two primary amino groups, and an aliphatic organic carbonate component C selected from the group consisting of dialkyl carbonates CD and of alkylene carbonates CA, wherein the ratio of the amount of substance Ji(—NH2) of primary amino groups —NH2 in the difunctional amine A to the sum M(C) of the amount of substance n(CD) of carbonate groups of a dialkyl carbonate CD and the amount of substance n(CA) of carbonate groups in an alkylene carbonate CA, is at least more than 2, and to the product obtained by this process.