Showing papers by "Cabot Corporation published in 1992"

Aqueous colloidal dispersion of fumed silica, acid and stabilizer

Abstract: An aqueous colloidal dispersion of fumed silica, acid and stabilizer, having a fumed silica concentration of at least about 40% by weight. A process for making an aqueous colloidal dispersion is also disclosed.

Handle grip cover and process for making same

Abstract: An improved handle grip cover formed of a knitted, braided, or woven tubular shaped material impregnated with a synthetic or natural elastomer. The grip cover is fabricated by placing a tubular shaped material, preferably elastic, over a form with a non-stick surface, and impregnating the tubular shaped material with a synthetic or natural elastomer. The tubular material is then cured, and peeled off of the form and trimmed to the desired length. The grip cover may be applied to a handle of a manual tool, a power tool, a piece of athletic equipment, or other article generally gripped by the hand.

Carbon blacks and their use in rubber applications.

Abstract: Carbon blacks having an I2No of 48-58 mg/g; a CTAB of 45-55 m2/g; A Tint of 65-75 %; a CDBP of 90-100 cc/100 g; and a DBP of 122-132 cc/100 g particularly well suited for use in the production of rubber compositions having reduced extrusion shrinkage properties. Also disclosed are rubber compositions containing the carbon blacks.

Fibrous tantalum and capacitors made therefrom

Abstract: A method of making a tantalum capacitor of improved specific capacitance (and volumetric efficiency) is described Short tantalum fibers are precipitated out of a carrier liquid to form a felt, or tumbled to form fiber containing particles, and in either case subsequently bonded so as to form a felt or particles containing the fibers in random orientation in substantially non-aligned array These particles or felt are heated to bond the fibers together, purify and (optionally) cylindricalize them The felt or particles can be processed in conventional fashion thereafter to form the capacitor Cylindricalized fibers and pellets of increased surface area are also described

Low rolling resistance/high treadwear resistance carbon blacks

Abstract: Carbon blacks having a CTAB of 95-120 m2/g, a CDBP of 106-120 cc/100g, a Tint/CTAB ratio of 0.90-1.10, a Skewness D?c? of 1.30-1.80 and a Skewness Ps of 1.00-1.50. Also disclosed are rubber compounds containing the carbon blacks which exhibit increased abrasion resistance, lower heat build-up and reduced rolling resistance.

Production of carbon blacks

Abstract: A process for preparing carbon blacks having lower-than-normal structure at a given surface area, and lower-than-normal surface area at a given overall combustion level. The process is carried-out by adding auxiliary hydrocarbons, which is hydrogen or any hydrocarbon having a molar hydrogen-to-carbon ratio greater than the molar hydrogen-to-carbon ratio of the feedstock, to the reaction zone of a carbon black reactor and adjusting the primary combustion and overall combustion so that the SSI of the process is less than zero.

Method of producing high surface area, low metal impurity

Abstract: A process for producing a high purity tantalum powder wherein a small quantity of an active ingredient, having a higher thermodynamic potential and chemical activity than the metal surfaces of the reactor vessel, is added to the reactor before the reactor is heated to reaction temperatures.

Tantalum powder and method of making same

Abstract: An improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a Scott density greater than about 18 g/in3 and preferably at least about 90% of the flake particles having no dimension greater than about 55 micrometers. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and pressing characteristics compared to conventional flaked tantalum powders. The improved flaked tantalum powder can be made by preparing a flaked tantalum and then reducing the flake size until a Scott density greater than about 18 g/in3 is achieved. The invention also provides pellets and capacitors prepared from the abovedescribed flaked tantalum powder.

Wrought tantalum or niobium alloy having silicon and a compound dopant

Abstract: A wrought metal alloy product having a tantalum or niobium base metal, 10 to 1000 ppm silicon, and 10 to 1000 ppm yttrium nitride. Fine uniform grain size contributes to improved ductility.

Flaked tantalum powder and method of using same

Abstract: An improved flaked tantalum powder and process for making the flaked powder are disclosed. The powder is characterized by having a mean particle size in the range of about 2 to about 55 micrometers and a BET surface area in the range of about 0.5 to about 5.0 m2/g. Preferably, the mean particle size and BET surface area are selected so that the flakes have an aspect ratio (D/T) in the range of about 2 to about 50. Agglomerates of the flaked tantalum powder, provide improved flowability, green strength and pressing charactistics compared to conventional flaked tantalum powders. The improved flaked tantalum powder can be made by preparing a flaked tantalum and then reducing the flake size until such mean particle size and BET surface areas are achieved such that the flakes have an aspect ratio (D/T) in the range of about 2 to about 50.