Spraylat Corporation, Inc.

Steven M Ladatto

Travis Owen Bush

Gareth Seatherton

Don Hughes

The present invention is directed to a coating powder base composition having a viscosity of between about 2 to about 85 Pa&#xb7;s and including a particulate organic pigment tinting agent. Such base composition can be produced in large batches and then smaller portions of such batches can be mixed with a tinting agent comprising solid organic pigment particles characterized by a maximum surface index of about 50 to obtain a desired color for the final coating powder. The invention also includes methods for making such coating powders as well as for coating substrates using such coating powders.

Coating powder compositions and method

A mixing system employing a rotary blade mixing assembly designed to mix liquid-like, resinous powders with a particulate tinting agent or other additive to produce a uniform, homogeneous powder is disclosed. The mixing system includes a mixing container that may be inverted up to 180&deg; and includes a rotary blade mixing assembly having at least two sets of mixing blades connected to a central shaft and arranged in parallel planes, each set having at least two mixing blades which are connected to the central shaft. Each blade is pitched at an angle to about 20&deg; to about 45&deg; from horizontal as measured following a 180&deg; inversion of the mixing container. Use of the method of the invention is advantageous when uniform color of the final coating powder is desired. The method comprises utilizing the above-mentioned mixing container to hold at least two powders, placing a mixing head containing the above-mentioned rotary blade mixing assembly in the container in sealed relationship, inverting the mixing container while commencing rotation of the mixing blades, and mixing the powders with a blade tip speed of from about 1,000 ft/min to about 5,000 ft/min to cause the powders to be lifted along the container side walls and fall down a central portion of the container. The mixing container is then returned to its original position.

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Lake Kiowa, TX, United States of America

Steven M Ladatto