Poly(Meth-)Acrylic Resin-based coating agent which can be cross-lined with Isocyanate
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United States of America Patent
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Jan 11, 2000
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N/A
app pub date -
Sep 4, 1996
filing date -
Mar 5, 1994
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Abstract
The present invention provides a coating composition and a process for producing a multicoat finish therefrom. The coating composition has a binder component obtained by polymerizing: (a) from 10 to 51% by weight of a mixture of hydroxy n-butyl (meth)acrylate(s) and hydroxy n-propyl (meth)acrylate(s), (b) from 0 to 20% by weight of at least one further hydroxyl group-containing monomer, (c) from 28 to 85% by weight of at least one (cyclo)aliphatic (meth)acrylic acid ester, (d) from 0 to 25% by weight of at least one aromatic vinyl compound, (e) from 0 to 5% by weight of at least one unsaturated carboxylic acid, and (f) from 0 to 20% by weight of further monomers, to give a polyacrylate resin having a hydroxyl number of from 60 to 200, an acid number of from 0 to 35, and an Mn of from 1000 to 5000. The coating composition also has a crosslinking component that is a mixture comprising a polyisocyanate having an average functionality of from 3 to 4 and having a uretdione group content of less than 5%, and optionally a polyisocyanate having an average functionality of from 2 to 3 and having a uretdione group content of from 20 to 40%, and optionally a further polyisocyanate.
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