Process for coating heat resistant substrates with two component stoving compositions
First Claim
1. A process for preparing a coated, substrate which comprisesI) coating the substrate with a coating composition comprisina) a solution or dispersion containinga1) 100 parts by weight of at least one hydroxyl-functional polyacrylate resin in dissolved or dispersed form, wherein the resin has a hydroxyl value of 15 to 200 mg KOH/G solid resin, an acid value of 5 to 250 mg KOH/G solid resin and a total content of chemically incorporated carboxylate and/or sulfonate groups of 8 to 450 milliequivalents per 100 g of solids,a2) 25 to 395 parts by weight of water anda3) 5 to 125 parts by weight of at least one organic solvent having a boiling point or boiling point range at 1013 mbar of 100°
- to 300°
C. andb) at least one organic polyisocyanate in a quantity corresponding to an equivalent ratio of isocyanate groups of component b) to isocyanate-reactive groups of component a1) of 0.7;
1 to 3;
1, andII) curing the coating composition at a temperature of 40°
to 160°
C. to form a bubble-free coating.
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Accused Products
Abstract
The present invention relates to a process for preparing a coated, heat resistant substrate by
I) coating the substrate with a coating composition containing
a) a solution or dispersion containing
a1) 100 parts by weight of at least one hydroxyl-functional polyacrylate resin in dissolved or dispersed form, wherein the resin has a hydroxyl value of 15 to 200 mg KOH/G solid resin, an acid value of 5 to 250 mg KOH/G solid resin and a total content of chemically incorporated carboxylate and/or sulfonate groups of 8 to 450 milliequivalents per 100 g of solids,
a2) 25 to 395 parts by weight of water and
a3) 5 to 125 parts by weight of at least one organic solvent having a boiling point or boiling range at 1013 mbar of 100 to 300° C. and
b) at least one organic polyisocyanate in a quantity corresponding to an equivalent ratio of isocyanate groups of component b) to isocyanate-reactive groups of component a1) of 0.7:1 to 3:1, and
II) curing the coating composition at a temperature of 40 to
The present invention is also directed to the coated substrates obtained by this process.
51 Citations
5 Claims
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1. A process for preparing a coated, substrate which comprises
I) coating the substrate with a coating composition comprisin a) a solution or dispersion containing a1) 100 parts by weight of at least one hydroxyl-functional polyacrylate resin in dissolved or dispersed form, wherein the resin has a hydroxyl value of 15 to 200 mg KOH/G solid resin, an acid value of 5 to 250 mg KOH/G solid resin and a total content of chemically incorporated carboxylate and/or sulfonate groups of 8 to 450 milliequivalents per 100 g of solids, a2) 25 to 395 parts by weight of water and a3) 5 to 125 parts by weight of at least one organic solvent having a boiling point or boiling point range at 1013 mbar of 100° - to 300°
C. andb) at least one organic polyisocyanate in a quantity corresponding to an equivalent ratio of isocyanate groups of component b) to isocyanate-reactive groups of component a1) of 0.7;
1 to 3;
1, andII) curing the coating composition at a temperature of 40°
to 160°
C. to form a bubble-free coating. - View Dependent Claims (2, 3, 4, 5)
- to 300°
Specification