Aqueous coating composition for corrosion protection
AssigneeAllnex Austria GmbH
InventorsArmin Temel, Florian Lunzer, Erik Bambach
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Abstract
The invention relates to an aqueous resin dispersion comprising a mixture of a hydrophilically modified epoxy-based resin, a crosslinker, and a co-crosslinker. The present invention also relates to an aqueous coating composition, comprising said resin dispersion, providing improved corrosion and discolouration resistance; to a process for the preparation of the aqueous resin dispersion and the coating composition; and to the use of the coating composition for coating metal substrates.
Claims22
An aqueous resin dispersion D comprising a mixture of a hydrophilically modified epoxy-based resin P, a blocked isocyanate crosslinker IB, and a co-crosslinker E;
- wherein the hydrophilically modified epoxy-based resin P comprises 1-hydroxy-2-phenoxy-ethyl groups;
- and wherein the co-crosslinker E is selected from the group consisting of
- a compound E1 having at least two hydroxyl groups that react with acid compounds present in the coating composition at elevated temperature above 80° C. under ester formation and liberation of water, and
- an ester E2 with at least two ester groups formed by an at least dihydric alcohol E22 and an acid E21 which acid is unstable at elevated temperature above 80° C.
Dependencies are inferred from the claim text.