C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/7939, 204/97
C09D 5/44 (2006.01) C08G 18/64 (2006.01) C08G 18/80 (2006.01) C08G 18/81 (2006.01) C08J 3/07 (2006.01) C09D 163/00 (2006.01)
Patent
CA 1329292
Abstract Process for the preparation of binder dispersions capable of being cathodically deposited using crosslinking agents based on polyisocyanates blocked by hydroxyl groups The invention relates to a process for the preparation of aqueous dispersions to be further proces- sed to electrocoating paints with baking temperatures below 160°C and baking times ? 30 minutes, which disper- sions contain modified epoxide-amine adducts as binders and polyisocyanates blocked by hydroxyl groups as cross- linking agents. In this process polyepoxides and compounds containing one or more, preferably 2, hydroxyl groups per molecule are reacted at elevated temperatures in the presence of catalysts to furnish epoxide-containing intermediates. A solvent or a mixture of solvents is then added with external cooling and the solution is boiled under reflux, if necessary in vacuo, until the temperature of the solution drops to 95°C to 20°C. Amines are then added onto the epoxide groups which are still present in a free state in the epoxy resin and a dispersion is prepared by adding a water/acid mixture after adding the crosslinking agent or the dispersion is first prepared and the crosslinking agent is added subsequently.
582706
Cibura Klaus
Dangschat Manfred
Geist Michael
Jouck Walter
Ott Gunther
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
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