| 摘要 |
<p>An aqueous coating agent contains (a) at least one binder, (b) water, (c) optional catalysts, auxiliary substances, degassing agents, levelling agents, U.V.-absorbers, radical catchers, non-ionic thickeners, biocides, water-retaining agents and/or anti-oxidants, (d) optional colouring and/or effect-producing pigments, (e) optional cross-linking agents. This coating agent is characterised in that it can be prepared by the following steps: (A) the binder is prepared in an organic solvent; (B) the thus obtained binder solution is dissolved or dispersed in critical or supercritical carbon dioxide in critical or supercritical carbon dioxide pressure and temperature conditions; (C) at least 80 % of the organic binder, relative to the total content of organic binders, is extracted from the thus obtained solution or dispersion and optionally recovered; (D) the thus obtained, solvent-impoverished solution or dispersion is added to water in subcritical carbon dioxide pressure and temperature conditions.</p> |
