초록

The reaction product thus obtained is dispersed in water and subjected to free radical polymerization, with at least 5 percent of the tertiary and/or primary amino groups present in the reaction product being neutralized with a Bronsted acid before, during or after dispersion.

대표청구항 ▼

[ We claim:] [1.] An aqueous electrocoating composition comprising cathodically depositable synthetic resins and an additive comprising crosslinked polymer microparticles which have a particle size of 0.01 to 10 .mu.m wherein the crosslinked polymer microparticles are prepared by reacting(a) a polyi

[ We claim:] [1.] An aqueous electrocoating composition comprising cathodically depositable synthetic resins and an additive comprising crosslinked polymer microparticles which have a particle size of 0.01 to 10 .mu.m wherein the crosslinked polymer microparticles are prepared by reacting(a) a polyisocyanate or a mixture of polyisocyanates with,(b) an organic compound containing at least one ethylenically unsaturated double bond and at least one active hydrogen atom per molecule of the organic compound or a mixture thereof,(c) an organic compound containing at least one active hydrogen atom and at least one group per molecule of organic compound selected from the group consisting of a tertiary amino group, a ketimine group, an aldimine group and mixtures thereof and, optionally,(d) an organic compound other than (b) and (c) containing at least one active hydrogen atom per molecule of the organic compound or a mixture thereof; in a mass ratio so that 3 to 80 percent of the isocyanate (NCO) groups of component (a) are reacted with component (b), 3 to 80 percent of the NCO groups of component (a) are reacted with component (c) and 0 to 94 percent of the NCO groups of component (a) are reacted with component (d) and a reaction product thus obtained comprising primary amino groups, tertiary amino groups or mixtures thereof is dispersed in water and subjected to free radical polymerization, wherein prior to free radical polymerization, at least 5 percent of the amino groups are neutralized with a Bronsted acid before, during or after dispersion.