TWO COMPONENT POWDER COATING SYSTEM AND THE METHOD FOR COATING HEATING SENSITIVE SUBSTRATES THEREWITH
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United States of America Patent
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app pub date -
Jun 4, 1999
filing date -
May 6, 1996
priority date (Note) -
Abandoned
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Abstract
Heat sensitive substrates, as well as others such as metal or glass, are electrostatically coated with a thermosetting coating powder comprising a melt-mixed, chilled, chipped, and powdered blend of an epoxy resin and a catalyst therefore, and a powdered low temperature curing agent along with conventional additives. The coating powder is deposited on the substrate and heated to fuse, flow and cure. The mixture of resin and catalyst does not cure within the extruder but it is made to cure at low temperatures on the desired substrate by the separate addition of the curing agent to the powdered melt-mixed blend. A small amount of the low temperature curing agent, insufficient to cause substantial curing in the molten stage may be used in place of the catalyst.
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