Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-05-10
2005-05-10
Sellers, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C427S386000, C525S113000, C525S438000, C525S486000, C525S523000, C525S524000, C525S934000
Reexamination Certificate
active
06890999
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 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.
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Chetcuti et al., “Matting Agents for Powder Coatings,” Southern Society for Coatings Technology, New Orleans, LA, Feb. 9-11, 1994, pp. 685-701.*
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Muthiah Jeno
Ruth William G.
Schlessman Jacquelyn M.
Seelig Carryll A.
Teti Jeremiah J.
Merriam Andrew E. C.
Rohm and Haas Company
Sellers Robert
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