One-component, low temperature curable coating powder
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United States of America Patent
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Mar 9, 2004
Issued Date -
N/A
app pub date -
May 21, 1999
filing date -
Nov 4, 1997
priority date (Note) -
Expired
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Abstract
A mixture of a self-curing epoxy resin having an equivalent weight of from about 100 to about 700, a melt viscosity of from out 200 to about 3000 centipoise at 150.degree. C. and a low temperature curing agent is extruded or otherwise mixed in the molten state as one component at a temperature below 230.degree. F. and the extrudate is cooled and pulverized to form a low temperature curable coating powder. The powder cures at a temperature of from about 225 to about 300.degree. F. and produces a coating having an exceptionally smooth surface with either a low or high gloss. The powder is particulary useful for coating heat sensitive substrates such as plastic parts for automobiles, paper, cardboard and wood. Fiberboard having a pattern such as a simulated wood grain printed on its surface and a powder coating of this invention over said pattern has the appearance of natural wood.
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