C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/14 (2006.01) B05D 1/36 (2006.01) C09D 133/00 (2006.01) C09D 167/06 (2006.01) C09D 201/00 (2006.01)
Patent
CA 2102170
Herberts Gesellschaft mit beschr?nkter Haftung Abstract: An aqueous vehicle composition is described, and also aqueous coating media which can be produced therefrom and their use in the production of multilayer coatings. The vehicle composition contains: A) 10 - 90 weight % of one or more compounds acting as crosslinking agents with an average of at least two acidic CH hydrogen atoms and B) 10 - 90 weight % of one or more (meth)acrylic copolymers, polyesters or polyurethane resins suitable for the Michael addition, with at least two .alpha.,.beta.- unsaturated groups bonded via the carbonyl carbon atom of -?-, -?-O- and/or -?-?-, with a C=C equivalent weight of 85 - 1800 and a number average molecular weight (Mn) of 170 - 10,000 g/mole, wherein the equivalent ratio of A:B is 2:1 to 1:2; C) 0.01 - 5 weight %, based on the sum of the weights of components A) and B), of a catalyst in the form of a Lewis or Br?nsted base, wherein the conjugate acids of the latter have a pKa value of at least 10, and also water and optionally solvents, pigments, extenders, the usual lacquer auxiliary process materials and/or additives.
Bederke Klaus
Brock Thomas
Flosbach Carmen
Schubert Walter
Herberts Gesellschaft Mit Beschrankter Haftung
Kirby Eades Gale Baker
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