Coating formulation for use in aqueous multicoat paint systems
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Jun 20, 1997
filing date -
Oct 28, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a coating formulation for use in multicoat paint systems, which a) comprises as binder a water-dilutable polyurethane resin which has an acid number of from 10 to 60 and a number-average molecular weight of from 4000 to 25,000 and can be prepared by reacting with one another aa) a polyester--and/or polyether-polyol having a number-average molecular weight of from 400 to 5000 or a mixture of such polyester--and/or polyether-polyols, bb) a polyisocyanate or mixture of polyisocyanates, cc) a compound which has in the molecule at least one group which in reactive toward isocyanate groups and at least one group which is capable of forming anions, or a mixture of such compounds, and optionally dd) a hydroxyl--and/or amino-containing organic compound having a molecular weight of from 40 to 400, or a mixture of such compounds and at least partially neutralizing the resulting reaction product, and b) comprises pigments and/or fillers, the ratio of binder to pigment being between 0.5:1 and 1.5:1.
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