| 摘要 |
The present invention concerns an aqueous powder coating dispersion consisting of a solid powder component A and an aqueous component B. Component A is a powder coating containing (a) at least one epoxy-containing binder including a quantity (30-45 %, preferably 30-35 %) of glycidyl-containing monomers, optionally containing vinyl-aromatic compounds, preferably styrene; (b) at least one cross-linking agent, preferably straight-chain aliphatic dicarboxylic acids and/or carboxy-functional polyesters; and (c) optionally, catalysts, auxiliary agents, powder-coating typical additives such as de-gassing agents, levelling agents, UV-absorbents, radical capturers and antioxidants. Component (B) is an aqueous dispersion containing (a) at least one non-ionic thickening agent; and (b) optionally, catalysts, auxiliary agents, antifoaming agents, dispergents, wetting agents, preferably carboxy-functional dispergents, antioxidants, UV-absorbents, radical capturers, biocides, small quantities of solvents and/or water retaining agents. Also object of the invention is a process for producing the powder coating dispersion and the use of the dispersion for motor vehicle bodies. |
