Showing papers by "Cabot Corporation published in 1991"

Easily dispersible carbon blacks

Abstract: Carbon blacks treated with a treating agent comprising at least one compound containing at least one long chain alkenyl or alkyl group and at least one amine group. Optionally, the compound contains at least one chemical group for linking the long chain alkenyl or alkyl group with the amine group. Also disclosed are ink compositions incorporating the treated carbon blacks and processes for preparing the compositions.

Process for making non-porous, micron-sized high purity silica

Abstract: A process for making non-porous, dense, silica particles having a diameter of about 3 to 1000 microns, a nitrogen B.E.T. surface area less than about 1 m2/g, a total impurity content of less than about 50 ppm and a metal impurity content of less than about 15 ppm from an aqueous dispersion of fumed silica. The particles are converted into porous particles and sintered in an atmosphere having a water partial pressure of from about 0.2 to about 0.8 atmosphere for temperatures below about 1200 °C.

Tantalum base alloys

Abstract: A wrought metal alloy product having a tantalum or niobium base metal, 10 to 1000 ppm silicon, and 10 to 10000 ppm yttrium nitride. Fine uniform grain size contributes to improved ductility.

The influence of eye colour on susceptibility to TTS in humans.

Abstract: In order to investigate the function of the inner ear melanin, noise-induced temporary hearing loss (temporary threshold shift, TTS) was studied in humans with either blue or brown iris colour. Sixty-eight normally hearing teenage boys participated in this study. Hearing thresholds before and after exposure were established with a computerized sweep frequency audiometer in the frequency range 0.8-8 kHz. The noise exposure consisted of a 1/3 octave band-filtered noise with centre frequency 2 kHz at 105 dB SPL for 10 min. The mean TTS in the frequency range 2-8 kHz showed a significant difference with the brown-eyed subjects developing least TTS, and the blue-eyed subjects most TTS.

Carbon blacks imparting superior treadwear/hysteresis performance and process for producing carbon blacks

Abstract: Carbon blacks having a CTAB » (I2 No. + 5 m2/g); a CDBP » 104 cc/100g; a Tint of (0.5(CTAB) + 70 m2/g > Tint > 0.5(CTAB) + 60 m2/g and an ASTM aggregate volume » 480,000 (nm)3. Also disclosed are rubber compositions in which the carbon blacks are incorporated.

Carbon black and rubber composition containing same

Abstract: New carbon blacks that when incorporated into rubber compositions impart increased abrasion resistance and lower hysteresis. Also disclosed are rubber composition incorporating the novel carbon blacks.

Improved treadwear/hysteresis carbon blacks

Abstract: Improved treadwear/hysteresis carbon blacks having a CTAB of 120-160 m2/g, a N?2?SA of 120-180 m?2?/g, a CDBP of 95-120 cc/100 g, a DBP of 110-145 cc/100 g, a Tint/CTAB ratio of 0.80-1.10, a ΔD50 of 70-100 and a ΔD50/Dmode ratio of 0.80-1.05. Also disclosed are rubber compositions containing the carbon blacks which exhibit superior treadwear/hysteresis performance properties.

Carbon black exhibitng superior treadwear/hysteresis performance

Abstract: Superior treadwear/hysteresis carbon blacks having a CTAB of about 90-98 m2/g, an N?2?SA of about 92-102 m?2?/g, an I?2? No. of 90-98 m?2?/g, a DBP of about 126-136 cc/100g, a CDBP of about 102-110 cc/100g, and a Tint of about 104-112. Also disclosed are rubber compositions containing the carbon blacks which exhibit superior treadwear/hysteresis performance properties.

Improved performance carbon blacks

Abstract: Carbon blacks having a CTAB of greater than 155 m2/g; an I?2?No. of greater than 180 mg/g; a N2SA of greater than 160 m?2?/g; a Tint value of greater than 145 %; a CDBP of 90-105 cc/100 g; a DBP of 115-140 cc/100 g; a ΔDBP (ΔDBP = DBP - CDBP) of 20-35 cc/100 g; a ΔD50 of less than 40 nm; a Dmode of 40-65 nm; ΔD50/Dmode ratio of 0.55-0.67; and an ASTM Aggregate Volume less than 137,000 (nm)3. Also disclosed are rubber compositions containing the carbon blacks which exhibit superior handling and cornering performance properties, increased abrasion resistance and improved traction.

Carbon black process control system

Abstract: A carbon black process control system measures input variables such as feedstock flow rate, feedstock quality, air flow rate, air humidity, air temperature, fuel flow rate, fuel quality, and/or potassium additive solution flow rate at spaced intervals while the carbon black reactor is operating Then, at spaced intervals in time one or more output variables of the carbon black, such as iodine number and/or DBP, are predicted in accordance with a prediction algorithm based on the values of the measured input variables Then, at spaced intervals in time the predicted values of the output variables, such as iodine number and/or DBP, are averaged Based on the average values of the predicted output variables, one or more input variables are then adjusted to achieve goal values of the predicted output variables, and thus obtain carbon black of substantially consistent quality The predicted output variables are also laboratory measured from samples of the carbon black produced at spaced intervals in time while the carbon black reactor is operating Then, based on both the predicted values and measured values of the output variables, the prediction algorithm is adjusted to improve the accuracy of the prediction of the output variables, and thus produce carbon black of substantially consistent quality

Method of producing high surface area low metal impurity tantalum powder

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 or niobium base alloys

Abstract: A wrought metal alloy product having a tantalum or niobium base metal, 25 to 1000 ppm silicon, and 25 to 1000 ppm molybdenum. Fine uniform grain size contributes to improved tensile strength, processability, and high temperature stability.

High surface area metal oxide foams

Abstract: The present invention includes metal oxide foam particles and a method of making the same. A decomposable metal salt feed solution is injected into a hot atomizing gas. The mixture of hot atomizing gas and feed solution is maintained in the reactor until the feed solution converts to metal oxide foam particles. The metal oxide foam particles have a high specific surface area.

Vibration damping handle grip and grip cover

Abstract: The present invention pertains to vibration and isolation damping handle grips and handle grip covers. The vibration damping handle grip includes a vibration damping elastomer (101) and a webbed, tack-free elastomer-coated tubular shaped material (102). The tack-free elastomer-coated tubular shaped material (102) or grip cover includes a tubular fabric which is knitted, braided or woven coated with a synthetic or natural elastomer. The vibration damping handle grip is fabricated in such a manner that the vibration damping elastomer (101) is nearest the vibration generating handle (100). The webbed, tack-free elastomer-coated tubular shaped material (102) is adapted to conform to the vibration damping elastomer (101) covered handle (100) shape. The improved handle grip provides a comfortable, substantially slip free hand gripping surface with improved vibration damping and vibration isolating properties.

Multilayered leadframe with interdigitated leads

Abstract: A leadframe for accomplishing electrical connection to an electronic device is formed of two or more layers, each having a set of leads extending therefrom The segments are assembled one above the other so that the leads of one set are interdigitated with the leads of the other set along the length of the leads The effective lead spacing of the leadframe is therefore less than that for any of the segments and is less than 0254mm in some portion of the interdigitated region The approach is particularly useful for stamped leadframe segments, because a minimum lead spacing for any segment is determined by the stamping operation

Noirs de carbone au four utiles dans des compositions de caoutchouc.

Abstract: L'invention concerne des noirs de carbone. Selon l'invention, ils ont une aire superficielle a l'azote d'au moins 180 m2 /g a environ 250 m2 /g, un rapport de l'aire superficielle a l'azote a l'indice d'adsorption d'iode d'environ 0,90 a 1,05, un rapport de DELTA D 50/mode D d'environ 0,67 a environ 0,81, une valeur de DBP comprise entre environ 115 cc/100g et environ 135 cc/100g et une valeur de DELTA DBP (DBP-CDBP) plus faible que ou egale a 20 cc/100g. L'invention s'applique notamment aux noirs de carbone a integrer dans des compositions de caoutchouc destinees a la fabrication de pneumatiques de haute performance ou de course.

A process and device for reducing free halogens in residual gasses

Abstract: An improved process and device for removing free halogen from residual gasses containing up to 15 % by volume oxygen. Gaseous hydrocarbons and hydrogen are uniformly dispersed in the residual gasses either simultaneously or sequentially and preferentially reacted with the free halogen present before a competing reaction with oxygen can occur. The dispersion device includes an outer housing member, a centrally disposed second member which transports the residual gas from the burner through the cooling zone, and means for transporting gaseous hydrocarbons and hydrogen from the housing member to the second member for rapid and uniform dispersion in the residual gas stream.

Metal-ceramic joining; Proceedings of the Symposium, TMS Fall Meeting, Detroit, MI, Oct. 8, 9, 1990

Abstract: Topics discussed in this book are in the areas of high temperature applications, joining processes, and electronic applications in metal ceramic joining. Papers are presented on the reactive diffusion bonding of Si3N4 to MA6000, the material factors affecting joining of silicon nitride ceramics, an overview of techniques and recent advances in ceramic-metal joining and metallization, a residual stress analysis and microstructural observations of ceramic-to-metal brazed joints, and the peel adhesion bond strength of direct bonded copper-alumina as affected by alumina sintering aids. Attention is also given to joining of partially stabilized zirconia to nodular cast iron, the silicate brazing of alumina ceramics using calcium aluminosilicate interlayers, graded metal-ceramic microjoints in parallel, the reactive metal brazing of aluminum nitride, and the effect of substrate surface on the bonding of Cu-AlN by active metal thin film and gas-metal eutectic methods.

Cadre de montage a plusieurs couches avec fils entrecroises, procede pour sa fabrication et module de circuit electronique l'utilisant.

Abstract: L'invention concerne un cadre de montage. Selon l'invention, il comporte un premier segment de couche (20) ayant un cadre (14) et un certain nombre de fils (16') qui s'en etendent, et un second segment de couche (22) recouvrant le premier segment et ayant un cadre et un certain nombre de fils qui s'en etendent, les fils de la seconde couche etant paralleles a et entrecroises avec ceux de la premiere couche. L'invention s'applique notamment aux circuits integres electroniques.