| abstract |
Polymer microparticles dispersed in the aqueous phase, obtainable by dispersing in aqueousnPhase of a precursor capable of forming a polyurethane from at least one component whichnisocyanate groups blocked with methyl ethyl ketoxime based on 1,3-bis (I-isocyanato-I-methylethyl) benzenen(TMXDI), a weight average molecular weight of 2,000 to 150,000, an acid numbernbetween 10 and 50, an OH number between 25 and 250; and on average a rationfrom blocked isocyanate groups to hydroxyl groups of less than I; Network thenPrecursor in the aqueous phase in the presence of a catalyst under atmospheric pressure at anTemperature of less than 100 ° C, the hydroxyl groups originating from the precursor withnthe isocyanate groups blocked with methyl ethyl ketoxime in the aqueous phase with elimination ofnMethylethyl ketoxime react to form urethane bonds; a process for theirnProduction and their use in aqueous or solvent-containing coating compositions. |