Process for the preparation of anionic aqueous polymer dispersions containing no volatile tertiary amine obtained dispersion and coating resulting from said dispersion

摘要

The present invention is based on the finding that, in the beginning, the tertiary amino functional acrylic monomer is used as a neutralizing agent for the pendant carboxylic acid group in the dispersion of polyurethane or polyurethane / polyacrylate, and then the unsaturated monomer is selectively added with other unsaturated monomer To a process for producing an aqueous dispersion of an anionic polyurethane which undergoes a polymerization reaction.;In this way, the prepolymer of isocyanate termini can be reacted with a stoichiometric amount of hydroxy functional unsaturated monomer from 0 to 100% before being dispersed in water.;The tertiary amine functional unsaturated monomer is present in a ratio of from 0.3 to 2, and preferably from 0.7 to 1.5, to the anionic moiety neutralized in the polyurethane prepolymer.;Furthermore, the amount of carboxylic acid functional groups in the isocyanate functional polyurethane prepolymer is 1 to 15%, preferably 2 to 10%.;The invention also relates to a dispersion prepared by the process and to a coating or film obtained with the dispersion.