Unimin Corporation

Ibezim Anazia

Louis M Schlesinger

Robert Ratcliff

David D Kragten

Christy Karr

Scott Van Remortel

Scott VanRemortel

An ultra-fine powder formed from a naturally occurring mineral or rock material and having a controlled or 'engineered' particle size distribution (PSD) to match the infrared spectra with a maximum particle size in the range of 14-17 microns measured as either D99, or preferably D95, and a minimum particle size D5 in the range of 4-7 microns. Preferably the maximum particle size is about 15 microns, the minimum particle size is about 5 microns and the D50 particle size is about 8-10 microns with the moisture content of the particle size 'engineered' powder being less than about 0.20 percent by weight and preferably about 0.05 to 0.08 percent by weight of the powder. This specially &#x201c;engineered&#x201d; ultra-fine powder is used to reduce the thermicity of thermal film to a value less than about 20%.

Powder formed from mineral or rock material with controlled particle size distribution for thermal films

An ultra-fine nepheline syenite powder produced from a pre-processed nepheline syenite powder feedstock. The powder having a 'controlled' maximum grain size D95 or D99 of less than about 20 microns and a 'controlled' minimum grain size D5 in the range of 2-8 microns with a particle size spread D5-D95 of less than about 12 microns.

Nepheline syenite powder with controlled particle size and novel method of making same

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Burnsville, NC, United States of America

Ibezim Anazia