C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 133/14 (2006.01) B05D 1/36 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) C09D 5/03 (2006.01) C09D 133/06 (2006.01) C09D 163/00 (2006.01) C09D 167/02 (2006.01) C08L 67/02 (2006.01)
Patent
CA 2138041
The invention relates to a process for the production of two-coat finishes, in which a pigmented basecoat is first applied, the resulting basecoat film is coated with a powder clearcoat, and basecoat and clearcoat are subsequently baked together. In accordance with the invention, the powder clearcoat employed is a powder coating which contains an epoxide group-containing polyacrylate resin as binder and a mixture of (A) a polyanhydride and (B) a carboxyl group-containing polyester resin as crosslinking agent. The polyester resin can be prepared by reacting a diol (b1), a compound (b2) which contains per molecule at least three functional groups selected from hydroxyl, primary amino, secondary amino, carboxyl and acid anhydride groups, and (b3) a dicarboxylic acid in a molar ratio of (b1) : (b2) : (b3) = 0.0 to 3.0 : 1.0 : 1.5 to 9.0 to give a polyester resin having an acid value of 40 to 300.
Cibura Klaus
Hilger Christopher
Kranig Wolfgang
Rademacher Josef
Woltering Joachim
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
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