Thermosetting glycidyl modified acrylic powder coatings
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United States of America Patent
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Dec 14, 1993
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app pub date -
Sep 4, 1992
filing date -
Sep 4, 1992
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Abstract
Thermosetting powder coating compositions are produced based on a low molecular weight glycidyl functional copolymer produced by solvent polymerization of ethylenic monomers in an organic solvent polymerization medium containing at least 15% by weight organic solvent based on the weight of solvent and monomers copolymerized, where the ethylenic monomers copolymerized comprise on a weight basis between about 15% and 35% glycidyl methacrylate, between about 5% and 60% methyl methacrylate, between about 2% and 15% butyl methacrylate, and between about 5% and 50% styrene, to produce glycidyl functional copolymer having a melt viscosity between 150 and 400 poise and a Tg between 80.degree. C. and 100.degree. C., where the copolymer is coreactive with carboxyl functional crosslinking compounds.
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