Rohm and Haas Company

Morton International, Inc.

William George Ruth

Carryll A Seelig

Jeno Muthiah

Dean A Schreffler

Jacquelyn M Schlessman

Jeremiah J Teti

Stacy L Greth

Tabitha Lynn McLeish

Tabitha Lynn Mc Leish

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&#xb0; 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&#xb0; 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&#xb0; 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.

Coating powder of epoxy resin and low temperature curing agent

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&deg; C. and a low temperature curing agent is extruded or otherwise mixed in the molten state as one component at a temperature below 230&deg; 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&deg; 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.

One-component, low temperature curable coating powder

Provided are low temperature curing thermosetting epoxy powder coating compositions comprising at least one non-crystalline epoxy resin, at least one crystalline epoxy resin, a curing agent, and a cure catalyst. Coatings made from such powder compositions exhibit a substantial reduction in bubble entrapment, enough to prevent a visible haze from forming in the coating, when cured at low temperatures demanded by brass substrates.

Powder coating with non-crystalline and crystalline epoxy resins and curing agent

A clear coat dicyandiamide cured epoxy powder coating for non-metallic substrates wherein the finish coat is visually haze-free as a result of the addition of a small amount of an aromatic substituted urea compound. Non-metallic substrates, such as brass, cannot withstand extremely high temperatures which are required to cure well known powder coatings. However, coating systems which cure at lower temperatures often produce a haze within the finish clear coat. The present invention alleviates this problem.

Thermosetting epoxy powder coatings having improved degassing properties

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&deg; C. and a low temperature curing agent is extruded as one component at a temperature below 220&deg; 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&deg; F. and produces a coating having a smooth surface with either a low or high gloss. The powder is particulary useful for coating heat-sensitive substrates such as plastics, paper, cardboard and wood.

One-component powder coating of epoxy resin, epoxy-polyamine adduct and acid matting agent

Substrate coated with powdered non-crystalline and crystalline epoxy resins

Provided are low temperature curing thermosetting epoxy powder coating compositions comprising at least one non-crystalline epoxy resin, at least one crystalline epoxy resin, a curing agent, and a cure catalyst. Coatings made from such powder compositions exhibit a substantial reduction in bubble entrapment, enough to prevent a visible haze from forming in the coating, when cured at low temperatures demanded by brass substrates, while the powders from which the coatings are made still exhibit good storage stability and melt-processability.

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Morgantown, PA, United States of America

William George Ruth