Rohm and Haas Company

Dsm IP Assets B.v.

Gordon L Tullos

Tina L Tullos

Andrew T Daly

Glenn D Correll

Jeno Muthiah

Paul R Horinka

Charles P Tarnoski

Casmir S Ilenda

Joseph J Kozlowski

Michael Louis Spera

Carryll A Seelig

Gregory R Mill

Grant E Schlegel

Douglas S Cinoman

Brian T Myers

Jaquelyn Schelessman

Todd M Bender

John R Petro

The present invention provides storage stable powder compositions comprising one or more carboxylic acid or anhydride functional, phosphorus-containing polyester chosen from aromatic polyesters having an acid number of 15 or higher mg KOH/g polyester, aliphatic polyesters having an acid number of 20 or higher mg KOH/g polyester. The acid functional, phosphorus-containing polyester comprises the reaction product of one or more polyacid, one or more phosphorus-containing acid or salt thereof and one or more polyol. Preferably, the one or more polyol reactant contains no &#x3b2;-hydrogen such as, for example, neopentyl glycol (NPG). The acid functional, phosphorus-containing polyester may comprise all or part of a binder powder composition, such as a coating powder, or it may comprise an additive thereto that imparts improved pigment wetting and corrosion resistance to a binder composition.

Acid functional phosphorus-containing polyester powder compositions and powder coatings made therefrom

A method of providing a powder coating to MDF substrate panels wherein, by the differential treatment of the front and back surfaces of these panels, both surfaces can be coated at the same time and the effects of moisture and other volatile outgassing is controlled in such a way as to provide a blemish-free front facing surface with a minimal, but nonetheless acceptable, amount of blemishes on the opposite or back surface. Differential treatment is achieved by preparing each surface using different grades of sand-paper, applying different amounts of curing energy, whether infra-red or thermal, or by applying different thicknesses of coating to each surface.

Differential processing of powder coated substrates

A powder coating composition includes an epoxy resin and a styrene-maleic anhydride copolymer having a glass transition temperature less than 105&#xb0; C. The compositions provide low gloss finishes at low curing temperatures, as well as consistent gloss over a wide range of curing temperatures.

Powder coating composition, method for the curing thereof, and articles derived therefrom

The present invention, a powder composition for making powder coatings comprising one or more than one curable polymer or resin and an agglomerate of a core-shell polymer, wherein the agglomerate of a core-shell polymer has an average particle size of from 5 to 190 microns, preferably from 10 to 127 microns. The powders in accordance with the present invention provide a cured powder coating that is flexible, smooth, and which may be applied in a thickness of only from 0.3 to 8 mils. In a preferred embodiment of making a powder in accordance with the present invention, the agglomerate is cryoground to form a reduced agglomerate prior to adding it into a powder as a post-blend or a powder-forming mixture as a preblend. The preferred core-shell polymer for use in accordance with the present invention comprises an acrylic impact modifier having a poly(methyl methacrylate) shell and a poly(butyl acrylate) core. Further, the preferred curable polymer or resin powder is an epoxy resin, wherein the powder composition is a low temperature curing one component powder composition which cures at from 107 to 149 degrees C.

Smooth, flexible powder coatings

A method of reducing the formation of surface defects in a coated substrate includes providing coating powders at both the appearance surfaces and the non-appearance surfaces of the substrate. A method of coating a substrate includes machining the appearance surface of the substrate, machining the non-appearance surface of the substrate, disposing a first powder at the appearance surface of the substrate, and disposing a second powder at the non-appearance surface of the substrate. The powders are disposed at the surfaces by electrostatic deposition. A method of facilitating the adherence of a coating at an edge between two surfaces of a substrate includes configuring the edge to have a rounded surface.

Method of reducing surface defects in a powder coated surface

A coating powder comprising a macrocyclic oligomer and a ring-opening polymerization agent is applied to an article, fused, and converted to a linear polymer at a temperature of from about 160 to about 400&deg; C. The powder has the low melt viscosity and friability of a thermoset powder but is converted at high fusing temperatures to a tough coating having the good impact resistance and good elongation of a thermoplastic powder. The oligomer is a polyester, polycarbonate, polyamide, polyimide, polyamideimide. The article may be coated electrostatically or in a fluidized bed.

Coating powders comprising macrocyclic oligomers

Method of coating with powders comprising macrocyclic oligomers

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 polyamine as a powdered low temperature curing agent along with a scavenger which will react secondarily with residual polyamine domains that do not contact the base epoxy resin during curing. 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.

Powder coating of epoxy resin, imidazole-epoxy resin catalyst or polyamine, polyamine powder and amine scavenger

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Reading, PA, United States of America

Gordon L Tullos