C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/04 (2006.01) B05D 1/36 (2006.01) C09D 5/02 (2006.01) C09D 151/08 (2006.01)
Patent
CA 2134942
31 A B S T R A C T Binders suitable for water-based coating agents and containing a mixture of: A) 5 to 50 wt.% of one or more polyurethanes containing carbonate groupings and with a number average molecular weight (Mn) of 70000 - 500000 and in the form of an aqueous dispersion obtainable by reaction of a) 10 to 40 wt.% of one or more organic polyisocyanates containing no hydrophilic groups or groups convertible into hydrophilic groups, b) 40 to 80 wt.% of one or more higher-molecular organic polyhydroxyl compounds containing no hydrophilic groups or groups convertible into hydrophilic groups and made up of at least 50 wt.% of one or more polyhydroxy polycarbonates, c) 0.2 to 18 wt.% of one or more lower-molecular compounds containing at least two groups which react with isocyanate groups but not containing any hydrophilic groups or groups convertible into hydrophilic groups, d) 1 to 12 wt.% of one or more compounds containing at least one ionic group or at least one group convertible into an ionic group together with at least one hydrogen atom capable of reacting with isocyanate groups and e) 0 to 8 wt.% of one or more non-ionic hydrophilic compounds containing at least one isocyanate group or at least one group capable of reacting with isocyanate groups and 32 B) 50 to 95 wt.% of one or more polyurethanes having a number average molecular weight (Mn) of 30000 to 500000 and in the form of an aqueous dispersion, obtainable by radically initiated polymerisation of one or more polyurethane macromonomers with a content of carboxylic, phosphonic acid and/or sulphonic acid groups and lateral vinyl groups in the presence of one or more unsaturated monomers copolymerisable with the polyurethane macromonomers, the percentage weights of components A) and B) each relating to the binder solids and adding up to 100 wt.%. The description also relates to aqueous coating agents containing the binders, and use thereof in a method of producing multi-layer lacquer coats.
Brock Thomas
Wandelmaier Klaus
Herberts Gesellschaft Mit Beschrankter Haftung
Kirby Eades Gale Baker
LandOfFree
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