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AssigneeRohm and Haas Company
InventorsJeno Muthiah, Jeremiah J. Teti, Jacquelyn M. Schlessman, William G. Ruth, Carryll A. Seelig
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A mixture of a self-curing epoxy resin having an equivalent weight of from about 100 to about 700, a melt viscosity of from about 200 to about 2000 centipoise at 150° C. and a low temperature curing agent capable of maintaining its own domain during extrusion which is extruded as one component at a temperature below 220° 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° F. and produces a coating having an exceptionally smooth surface with either a low or high gloss. The powder is particularly useful for coating heat sensitive substrates such as plastics, paper, cardboard and wood.
A thermosetting coating powder which cures at a temperature of from about 225 to about 300° F. and comprises an extruded mixture of an epoxy resin having a melt viscosity of from about 200 to about 2000 centipoise at 150° C. and a powdered low temperature curing agent which is solid at about 80° F. and which maintains its own domain during extrusion at 160° F. to 220° F.
A thermosetting coating powder which cures at a temperature of from about 225 to about 300° F. and comprises an extruded mixture of an epoxy resin having a melt viscosity of from about 200 to about 2000 centipoise at 150° C. and a powdered low temperature curing agent which has an average particle size of from 1 to 15 microns and which is solid at about 80° F.
Dependencies are inferred from the claim text.