Process for the preparation of matte coatings using powdered thermosetting compositions
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United States of America Patent
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Jun 11, 1996
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N/A
app pub date -
Jan 13, 1995
filing date -
Jan 8, 1992
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Abstract
A process for the preparation of a matte coating on an article is described, which comprises applying to said article a powdered thermosetting composition comprising as binder a mixture of a linear carboxyl group-containing polyester and a glycidyl group-containing acrylic copolymer and curing the thus coated article at a temperature of from 160.degree. C. to 210.degree. C. for a period of up to about 30 minutes. The polyester has an acid number of 20 to 50 mg KOH/g, and is the esterification product of a hydroxyl group-containing polyester with an organic dicarboxylic acid. The acrylic copolymer is obtained from 5% to 30% by weight of glycidyl acrylate or glycidyl methacrylate and 70% to 95% by weight of methyl methacrylate, whereby up to 25% of the total weight of methyl methacrylate can be replaced by another vinyl monomer, said acrylic copolymer having a number-average molecular weight (Mn) of from about 4,000 to about 10,000.
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