Abstract: A composition including ground calcium carbonate may have a coarse particle size and high steepness factor. Some compositions may include ground calcium carbonate and an additive, such as kaolin. A coating including ground calcium carbonate may have a course particle size and high steepness factor, and a carrier suspending the ground calcium carbonate. The ground calcium carbonate may have a mean particle size (d50) greater than about 2.4 ?m. The ground calcium carbonate may also have a steepness factor greater than about 30. Also described are products including a substrate and a coating applied to the substrate, where the coating includes ground calcium carbonate having a coarse particle size and high steepness factor.

Abstract: Disclosed herein are methods for removing discoloring impurities, such as carbon impurities, particularly graphite, from kaolin clay to enhance the brightness of the kaolin clays. The methods include reverse flotation processes. Also disclosed herein are high brightness kaolin products, and the uses thereof.

Abstract: A method and a device are disclosed for donning and doffing, using magnetic force, yarn tubes mounted on a creel. A base frame is used to support pivoted arms on which yarn tubes are mounted for use with various textile machines. The yarn tube may be in at least one of two positions: donning position and doffing position. In the doffing position the thread may be fed to the textile machine for weaving, while in the donning position the thread spool may be replaced by another thread spool. The pivoted arms may be held in either the donning or the doffing positions with magnetic force for secure positioning of the pivoted arms. One-handed and easy operation of the donning and doffing process may be performed due to the use of magnetic force to hold the pivot arm in the predetermined positions.

Abstract: Disclosed herein are methods for removing discoloring impurities, such as carbon impurities, particularly graphite, from kaolin clay to enhance the brightness of the kaolin clays. The methods include reverse flotation processes. Also disclosed herein are high brightness kaolin products, and the uses thereof.

Abstract: Disclosed herein are stabilized kaolin slurries comprising a kaolin comprising no more than about 80% by weight of particles having an equivalent spherical diameter of less than 2 microns and at least one stabilizer, wherein the stabilized kaolin slurry has a 28-day pour test result of at least about 80% poured. Also disclosed are methods of making such stabilized kaolin slurries.

Abstract: Disclosed herein is a kaolin composition having nanosize dimensions. At least about 75% of the kaolin particles by weight have an equivalent spherical diameter (esd) of less than about 0.25 ?m. The kaolin can also have a particle size distribution wherein at least about 99% of the particles by weight have an esd of less than about 2 ?m, and/or wherein at least about 98% of the particles by weight have an esd of less than about 1 ?m, and/or wherein at least about 97% of the particles by weight have an esd of less than about 0.5 ?m. The kaolin can have a mean diameter ranging from about 0.075 ?m to about 0.2 ?m, and a shape factor of about 30 or less.

Abstract: Disclosed herein are a method of reductively bleaching a mineral slurry comprising adding in the mineral slurry an effective amount of a formamidine sulfinic acid (FAS) and an effective amount of a borohydride to reductively bleach the mineral slurry, compositions comprising a mineral slurry, a FAS, and a borohydride, and final products comprising a mineral obtained by the method disclosed herein.

Abstract: Disclosed herein are kaolin compositions, such as beneficiated fine sedimentary kaolin compositions. The beneficiated fine sedimentary kaolins may be obtained from the upper bed of the Rio Capim Kaolin deposit. The compositions may have at least one property chosen from a fine particle size, high steepness, and low shape factor, such as a steepness of at least about 35, and a median particle size (d50) of about 0.3 ?m or less. Also disclosed are methods of refining kaolins, and products obtained therefrom, such as paint and paper coating compositions.

Abstract: Disclosed herein are kaolin compositions, such as beneficiated fine sedimentary kaolin compositions. The beneficiated fine sedimentary kaolins may be obtained from the upper bed of the Rio Capim Kaolin deposit. The compositions may have at least one property chosen from a low iron content and low Hinckley crystallinity index, such as Fe2O3 in an amount less than about 0.8% by weight relative to the total weight of the solids content and wherein the Hinckley crystallinity index of the kaolin is less than about 0.5. Also disclosed are products obtained therefrom, such as paint and paper coating compositions.

Abstract: The Rio Capim Kaolin deposit contains a lower bed of soft kaolin clay that averages 10 meters thick, and an upper bed of “hard” kaolin (“RCC hard kaolin”) that may be as thick as 6 to 8 meters. Due to their high impurity content fine particle size, cementetious nature, and high degree of particle aggregation, hard kaolins are difficult to process. Disclosed herein are compositions comprising kaolin having a particle size distribution such that at least about 90% of the kaolin has a particle size of less than 1 micron and a GE brightness of at least about 91, where the kaolin may be derived from a crude kaolin having a Fe2O3 content of at least about 1.0% by weight, and optionally comprises titania in an amount of at least about 1.5% by weight. Also disclosed herein are methods of refining the hard kaolins, such as RCC hard kaolins, by dispersing the kaolin with at least one anionic organic dispersant and at least one inorganic dispersant.

Abstract: A method for the treatment of kaolin particulate material comprising: providing a dispersed aqueous suspension comprising kaolin particulate material and having a pH of at least about 7.5; selecting at least one selective flocculation polymer, wherein said at least one selective flocculation polymer has a measured anionicity ranging from about 1% to about 12%, such as from about 4.5% to about 8%; selectively flocculating said suspension into a first layer and a second layer by adding to said suspension said at least one selective flocculation polymer, and separating said first layer from said second layer.

Abstract: The present invention relates to a kaolin composition having improved physical properties, for example, for use in the production of paper products. The composition can comprise kaolin having a shape factor of at least about 20. The kaolin can have a particle size distribution such that at least about 94% by weight of the kaolin can have an esd of less than about 2 ?m and/or at least about 80% by weight of the kaolin can have an esd of less than 1 ?m. The amount of the kaolin having an esd of less than about 0.25 ?m can range from about 25% to about 60% by weight. The Hercules viscosity of the kaolin product is less than 4000 rpm at 18 dynes at 63% solids and less than 1500 rpm at 18 dynes at 69% solids when measured using the “A” bob. The present invention also relates to an improved method for making the kaolin product from sedimentary kaolin.

Abstract: Abstract of the Disclosure The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.

Abstract: The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.

Abstract: The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.

Abstract: The present invention relates to a hydrous kaolin product having improved optical properties, for example, when used in the production of paper products. The present invention comprises an improved barrier coating for paper and a method of making the coated paper. The present invention also comprises an improved method from making filled and coated paper products. The present invention uses a composition comprising kaolin having a shape factor of at least about 70:1, such as at least about 80:1 or at least about 100:1.