Formaldehyde-free amino or amide resins based on a reactive protective group and a di- or trialdehyde as a network former

摘要

A process for preparing a formaldehyde-free amino resin or amide resin comprising (i) reacting an amine or amide having 2-3 amine or amide groups with a monoaldehyde having at least 2 carbon atoms to form an intermediate, which has at least one amine group or amide group a reactive protecting group derived from the monoaldehyde, and (ii) the reaction of the intermediate with a dialdehyde or trialdehyde to form a crosslinkable amino resin or amide resin wherein - for an amine or amide having 3 amine or amide groups, the molar ratio of the monoaldehyde to the amine or amide groups in the range of 0.5 / 3 to 2.2 / 3 and the molar ratio of the dialdehyde or trialdehyde to the amine or amide groups in the range of 0.1 / 3 to 2.2 / 3, - for an amine or amide having 2 amine or amide groups, the molar ratio of the monoaldehyde to the amine or amide groups in the range of 0.2 / 2 to 1.5 / 2 un d is the molar ratio of the dialdehyde or trialdehyde to the amine or amide groups in the range of 0.1 / 3.9 to 1.5 / 2.