Abstract: The present invention is directed to blocked biuret group-containing polyisocyanate compositions, wherein the blocking agent is of the formula: wherein R1, R2, R3 and R4 may be the same or different and represent a moiety selected from the group consisting of hydrogen, C1-C6-alkyl and C3-C6-cycloalkyl, R5 represents a moiety selected from the group consisting of C1-C10-alkyl and C3-C10-cycloalkyl, and B is a group according to one of the following structural formulas wherein each occurrence of R6, R7, and R8 may be the same or different and represent a moiety selected from the group consisting of C1-C6-alkyl and C3-C6-cycloalkyl and R9 is a moiety selected from the group consisting of hydrogen, C1-C6-alkyl and C3-C6-cycloalkyl.

Abstract: The present invention is directed to blocked biuret group-containing polyisocyanate compositions, wherein the blocking agent is selected from the group consisting of di-C1-C12-alkyl and/or alkoxyalkyl malonates and acetoacetic acid C1-C12-alkyl and/or alkoxyalkyl esters.

Abstract: The present invention is directed to a biuret group-containing polyisocyanate composition having an isocyanate functionality of at least 4 prepared by a process comprising reacting a polyisocyanate adduct which a) is prepared from an aliphatic and/or cycloaliphatic diisocyanate; b) has an average isocyanate functionality of at least 2.5, and c) contains isocyanurate groups, with a secondary monoamine at an isocyanate to amine equivalent ratio of from about 4:1 to about 14:1 to incorporate biuret groups into said polyisocyanate. The invention is also directed to a blocked biuret group-containing polyisocyanate composition which is prepared by reacting the biuret-containing polyisocyanate with a blocking agent.

Abstract: The present invention is directed to blocked biuret group-containing polyisocyanate compositions, wherein the blocking agent is selected from the group consisting of a blocking agent of the formula: wherein R1, R2, R3 may be identical or different and represent a moiety selected from the group consisting of hydrogen, C1-C4-alkyl and C3-C6-cycloalkyl, R4 represents a moiety selected from the group consisting of C1-C4-alkyl, C6-C10-cycloalkyl or C7-C14-aralkyl, and x represents a number of from 1 to 5, and a blocking agent of the formula: wherein R1, R2, R3 and R4 may be the same or different and represent a moiety selected from the group consisting of hydrogen, C1-C6-alkyl and C3-C6-cycloalkyl, R5 represents a moiety selected from the group consisting of C1-C10-alkyl and C3-C10-cycloalkyl, and B is a group according to one of the following structural formulas wherein each occurrence of R6, R7, and R8 may be the same or different and represent a moiety selected from the group consisting of C1-C6-a

Abstract: The present invention relates to an aqueous coating composition containing prior to the reaction between components A) and B)A) 10 to 75 wt. %, based on the solids contents of components A) and C), of at least one dispersion or solution of a polyester polyol containing carboxylate and/or sulphonate groups, having a weight average molecular weight of 1,000 to 40,000, an OH number of 15 to 100 and an acid number of 2 to 40 based on all of the carboxylate, carboxyl and sulphonate groups,B) an ester-modified polyisocyanate having an average NCO functionality of 2 to 6 and containing 5 to 20 wt. % of ester groups (calculated as C.sub.3 O.sub.2, MW 68), 5 to 18 wt. % of isocyanate groups and 0 to 20 wt. % of chemically incorporated hydrophilic, nonionic groups, wherein the preceding percentages are based on the solids content of the ester modified polyisocyanate andC) 25 to 90 wt.