Aqueous coatings, the production thereof and the use thereof in the production of multi-layer paint coatings
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United States of America Patent
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May 30, 2000
Grant Date -
N/A
app pub date -
Mar 8, 1999
filing date -
Sep 6, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Aqueous coatings for the multi-layer painting of motor vehicles based on one or more binders and optionally crosslinking agents, pigments and/or fillers, paint industry additives and/or solvents, which contain as binder an aqueous dispersion based on polyurethane/polymer hybrid polymers having a numerical average of the molar mass (Mn) of 8000 to 1500000, a ratio by weight of polyurethane to polymer content of 0.05:1 to 50:1, a hydroxyl number of 0 to 150 mg KOH/g, based on solid resin, hydroxyl groups bound to silicon not being included when calculating the OH number, and an acid number of 1.5 to 40 mg KOH/g, based on solid resin, and a content of 0.5 to 150 mmole of silicon per 100 g of solid resin in the form of siloxane bridges (--Si--O--Si--) bound into the polyurethane content and/or in the form of silanol groups bound to the polyurethane content.
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