C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/03 (2006.01) C08J 3/03 (2006.01) C08J 3/05 (2006.01) C09D 5/02 (2006.01) C09D 133/14 (2006.01) C09D 163/00 (2006.01)
Patent
CA 2220465
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.
L'invention concerne une dispersion aqueuse de peinture pulvérulente qui comprend un constituant A pulvérulent solide et un constituant B aqueux. Le constituant A est une peinture pulvérulente contenant: a) au moins un liant époxydique contenant entre 30 et 45 %, de préférence entre 30 et 35 % de monomères glycidyliques contenant éventuellement des composés vinylaromatiques, de préférence du styrène, b) au moins un réticulant, de préférence des acides dicarboxyliques aliphatiques à chaîne linéaire et/ou des polyesters carboxyfonctionnels et c) éventuellement des catalyseurs, des adjuvants, des additifs propres aux peintures pulvérulentes, tels que des agents de dégazage, des produits nivelants, des absorbeurs d'U.V., des absorbeurs de radicaux, des biocides, des volumes réduits de solvants et/ou de rétenteurs d'eau. L'invention concerne en outre un procédé de production de cette dispersion de peinture pulvérulente, ainsi que son utilisation pour des carrosseries d'automobiles.
Moller Dietmar
Woltering Joachim
Basf Coatings Aktiengesellschaft
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
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