Abstract: An improved dry ground calcium carbonate filler is provided which is less sensitive to variations in relative humidity and does not promote premature viscosity increase in polyester molding compound. This filler is dry ground from a Caribbean micritic limestone to produce Class I and Class II fillers which are acceptable for use in polyester molding compound applications. A polyester molding compound containing this dry ground filler produces a composite having superior izod impact resistance and surface quality. In some situations filler loading levels may be increased 10-15% in the SMC/BMC without detrimental effects on the final composite.

Abstract: An improved dry ground calcium carbonate filler is provided which is less sensitive to variations in relative humidity and does not promote premature viscosity increase in polyester molding compound. This filler is dry ground from a Caribbean micritic limestone to produce Class I and Class II fillers which are acceptable for use in polyester molding compound applications. A polyester molding compound containing this dry ground filler produces a composite having superior izod impact resistance and surface quality. In some situations filler loading levels may be increased 10-15% in the SMC/BMC without detrimental effects on the final composite.

Abstract: A method of making pellets from silica, sodium silicates and sodium aluminosilicates by pelletizing the materials in the presence of ammonium stearate. Upon removal from the pelletizer, the formed pellets are dried.

Abstract: Reject material which has been removed from a thermal black process by a screen and impinged on a plate in the bag filter, can be upgraded by removing material which has been reduced in size by being sucked into the bag filter, and adding that material to the product stream. The material of reduced size is removed by a vibrating screen. Some 50 to 60% of the reject material can be upgraded by this process.

Abstract: The tail gas generated by the carbon black process can be used as a source of fuel for drying carbon black without adversely affecting the product properties of the end product if the dried carbon black is heat treated using a fuel free of sulfur and nitrogen compounds.

Abstract: A process for making densified kaolin clay pellets of high bulk density, good handling and bulk flow properties, and low moisture content is disclosed. The process consists essentially of mixing substantially dry kaolin clay with steam to bring the total moisture content of the finely divided kaolin clay to from about 17% to about 26% by weight based on the weight of said dry kaolin clay during mixing in a roller mixer, followed by screening, and subsequent pelletization in a roller while drying. The pellets are dried to 1% or less moisture content by weight based on the weight of dry kaolin clay.

Abstract: A process for making densified pellets of pigmentary materials such as kaolin clay and talc of high bulk density, good handling and bulk flow properties, and low moisture content is disclosed. The process consists essentially of mixing substantially dry pigmentary material with water to bring the total moisture content of the finely divided pigmentary material to from about 17% to about 26% by weight based on the weight of said dry pigmentary material during mixing in a pin mixer, followed by screening, and subsequent pelletization in a roller while drying. The pellets are dryed to 1% or less moisture content by weight based on the weight of dry pigmentary material.

Abstract: The amount of polycyclic aromatic hydrocarbons on the surface of a carbon black can be reduced below 2 ppb by heat treating the carbon black in a fluidized bed. Dried furnace carbon black pellets are charged in a fluid bed unit and preheated. The pellets are then fluidized with air, with the temperature of the bed between 1150.degree. F and 1850.degree. F for 5 to 40 minutes. The carbon black is then quenched and recovered.