Water-dilutable emulsion polymer, process for making the water-dilutable emulsion polymer, aqueous coating compositions based on the emulsion polymer and the use thereof as udrivnings- and dispergeringsharpiks and as a binder for physically drying lacquers

摘要

PCT No. PCT/EP92/02282 Sec. 371 Date Mar. 28, 1995 Sec. 102(e) Date Mar. 28, 1995 PCT Filed Oct. 2, 1992 PCT Pub. No. WO93/07191 PCT Pub. Date Apr. 15, 1993The present invention relates to water-dilutable emulsion polymers prepared by multistep emulsion polymerization. To this end, (a1) 0.5 to 5.0% by weight of ethylenically unsaturated monomers containing carboxyl groups, and (a2) from 0.5 to 2.5% by weight of olefinically unsaturated carboxamides, where a total of from 1.0 to 8.0% by weight of hydrophilic ionic and hydrophilic nonionic olefinically unsaturated monomers are employed, and (b) from 92.0 to 99.0% by weight of further ethylenically unsaturated monomers containing no further functional groups, are polymerized in the first step of the emulsion polymerization, where the total amount of monomers in the first step is 100% by weight, and exclusively olefinically unsaturated monomers containing no further functional groups are polymerized in the second step of the emulsion polymerization, and the weight ratio between the monomers polymerized in the first step and the monomers polymerized in the second step is from 30-80%:20-70% by weight. The emulsion polymers are preferably used for the grinding resin for pigments, dispersion resins and as binders in physically drying aqueous lacquers for metallic surfaces, wood and mineral substrates.