Coating agents based on hydroxyl-containing polycondensation and polyaddition products and their use
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United States of America Patent
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Jul 5, 1994
Grant Date -
N/A
app pub date -
Mar 15, 1993
filing date -
Jul 31, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to coating agents based on hydroxyl-containing binders and isocyanate-containing crosslinking agents, in which coating agents I.) the binder comprises A1) 5 to 80% by weight of at least one polyester or one alkyd resin having an OH number from 0 to 200 mg of KOH/g and an acid number from 0 to 200 mg of KOH/g, A2) 95 to 20% by weight of at least one polyacrylate having an OH number from 30 to 250 mg of KOH/g and an acid number from 0 to 50 mg of KOH/g, the sum of the weight proportions of components (A1) and (A2) being in each case 100% by weight, and II.) the binder is obtainable from 1.) at least one polycondensation resin whose acid component comprises 5 to 100 mol % of cycloaliphatic polycarboxylic acids and/or esterifiable derivatives thereof, 2.) at least one polyacrylate, at least some of which has been prepared in the presence of the polycondensation resin obtained in the first process step and 3.) if desired, at least one further Polyaddition and/or one further Polycondensation resin.
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