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AssigneeUnimin Corporation
InventorsDavid D. Kragten, Christy Karr, JR., Scott VanRemortel, Robert Ratcliff, Ibezim Anazia, Louis M. Schlesinger
Estimating the term…
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 “engineered” ultra-fine powder is used to reduce the thermicity of thermal film to a value less than about 20%.
An ultra-fine nepheline syenite powder produced from a feedstock constituting pre-processed nepheline syenite powder with a maximum grain size D99 greater than 20 microns, said ultra-fine nepheline syenite powder produced from said feedstock has a moisture content of less than 1.0% by weight, a controlled minimum grain size D5 in the range of 4-7 microns and a control maximum grain size D95 of about 15 microns and a mean grain size D50 in the range of about 8-10 microns and wherein the maximum node of the PSD curve for the powder being between 7 and 14 microns.
An ultra-fine powder substantially free of silica and formed from a naturally occurring mined substance with a controlled maximum grain size D95 of about 15 microns, a controlled minimum grain size D5 of about 4-7 microns and a D50 grain size in the range of about 8-10 microns where said powder has a moisture content of less than 1.0% by weight and wherein the maximum node of the PSD curve for the powder being between 7 and 14 microns.
An ultra-fine nepheline syenite powder with a controlled minimum grain size in the range of 4-7 microns and a controlled maximum grain size of about 15 microns.
An ultra-fine powder having substantially no free silica and formed from a naturally occurring mined substance with a controlled maximum grain size D95 of about 15 microns, a controlled minimum grain size D5 of about 4-7 microns and a D50 grain size in the range of about 8-10 microns where said powder has a moisture content of less than 1.0% by weight and wherein the maximum node of the PSD curve for the powder being between 7 and 14 microns and the thermicity of a film using said powder is less than 20%.
A powder filler for thermal film, said powder having substantially no free silica and being formed from a naturally occurring mined substance with the particle size controlled whereby said powder is ultra-fine and has a particle size spread between D5 and D95 of less than about 12 microns.
An ultra-fine powder formed from a naturally occurring mineral or rock material having a Mohs hardness of at least 5, said powder having a controlled or “engineered” particle size distribution with a maximum particle size in the range of 14-17 microns and a minimum particle size D5 in the range of 4-7 microns.
An ultra-fine powder formed from a naturally occurring mineral or rock material having a refractive index of about 1.4 to 1.6, said powder having a controlled or “engineered” particle size distribution with a maximum particle size in the range of 14-17 microns and a minimum particle size D5 in the range of 4-7 microns.
A method of producing an ultra-fine powder, comprising:
A method of producing an ultra-fine powder, comprising:
A method of producing an ultra-fine powder with a controlled particle size distribution, said method comprising:
Dependencies are inferred from the claim text.