648 results about "Precipitated silica" patented technology

The present invention relates to the preparation of rubber compositions for tire tread and tire sidewall component applications. A tire is provided having tread of such composition designed for relatively heavy loads such as, for example, truck tires. A tire having a sidewall of such composition is also provided. Such tire component rubber compositions are of rubber compositions reinforced with precipitated silica and selected carbon black in specified amounts and prepared with a prescribed order of addition to the rubber composition and composed of elastomers as a specific combination of natural or synthetic cis 1,4-polyisoprene rubber together with cis 1,4-polybutadiene rubber or with a combination of cis 1,4-polybutadiene rubber and trans 1,4-polybutadiene rubber.

A method for increasing the hardness of silica/rubber mixtures is disclosed wherein the method comprises blending with said mixture at least one silane and a hardness-increasing amount of at least one member selected from the group consisting of thixotropic fumed silica; precipitated silica; an MQ resin wherein Q is SiO_4/2, M is R¹R²R³SiO_1/2, and R¹, R², and R³ are the same or different functional or non-functional organic groups; carbon black; a thermoplastic resin; and a thermosetting resin.

A well treating composition of a composite containing a scale inhibitor adsorbed onto a water-insoluble adsorbent is useful in the control, formation and treatment of inorganic scales in a subterranean formation or wellbore. In addition, the well treating composition is useful in controlling the rate of release of scale inhibitor in the wellbore. The water-insoluble adsorbent may be activated carbon, silica particulate, precipitated silica, zeolite, diatomaceous earth, ground walnut shells, fuller's earth and organic synthetic high molecular weight water-insoluble adsorbents. The composite may be introduced into an oil or gas well with a carrier fluid.

A partially hydrophobic precipitated silica having a methanol wettability of 10 to 49%, in particular with a DBP uptake on a dry basis of greater than 250 g/100 g and a mean particle size of 1 to 12 mum and/or a carbon content of 0.3 to 1.85% and/or a loss on drying of 2.6 to 10.0% and/or a pH value of 5.5 to 10.0, is prepared by mixing the amount of water-repellent agent with the precipitated silica suspension at very short residence time and low pH value, filtering off the solid substance, washing free of salt, drying, post-treating thermally and milling. The partially hydrophobic precipitated silica can be used in active substance formulations and active substance formulations of hydrolysis-sensitive substance and in defoaming agents.

A method of making precipitated silica abrasive compositions having excellent cleaning performance and lower abrasiveness with post-reactor sizing of the abrasive particles being performed via air classification techniques is provided. By targeting a specific particle size range, it has been determined that higher pellicle film cleaning levels may be achieved without also increasing the dentin abrasion properties of the silica products themselves. As a result, dentifrices including such classified abrasive silica products, and exhibiting particularly desirable cleaning benefits, can be provided for improved tooth polishing, whitening, and the like, without deleteriously affecting the hard tooth surfaces. Also encompassed within this invention also are products of this selective process scheme and dentifrices containing such classified silica products.

The invention relates to a transparent butyl hot-melt sealant, which is prepared with the following raw materials in parts by weight: 1-20 of butyl rubber, 10-80 of polyisobutylene, 5-30 of plasticizer, 3-10 of tackifier, 3-10 of softener, 0.1-5 of stabilizer, 5-30 of filler and 0.1-5 of adhesion promoting agent. The matching use of the butyl rubber and the polyisobutylene with different molecular weights facilitates the improvement of the strength and workability of the transparent butyl hot-melt sealant. The filler is selected from fumed silica or precipitated silica, which ensures the appearance transparency of the product. Due to the addition of the stabilizer and the strict control of the production process, the appearance transparency and the physical and chemical properties of the product are enhanced. The use of the active group substituted alkoxy silane as a coupling agent improves the adhesion of the product to glass, aluminum and other substrates.

A method of making abrasive compositions, and more particularly, it relates to a method of making precipitated silica abrasive compositions having excellent cleaning performance and lower abrasiveness with post-reactor sizing of the abrasive particles being performed directly via wet comminution and centrifugation, optionally followed by hydraulic chamber press filtering combined with vacuum dewatering and de-agglomeration is provided. By targeting a specific particle size range, it has been determined that higher pellicle film cleaning levels may be achieved without also increasing the dentin abrasion properties of the silica products themselves. As a result, dentifrices including such classified abrasive silica products, exhibiting particularly desirable cleaning benefits, can be provided for improved tooth polishing, whitening, and the like, without deleteriously affecting the hard tooth surfaces. Also encompassed within this invention also are products of this selective process scheme and dentifrices containing such particularly manufactured and classified silica products.

A catalyst and method for producing hydrocarbons using a catalyst support having an improved hydrothermal stability, such as under Fischer-Tropsch synthesis conditions. The stabilized support is made by a method comprising treating a boehmite material in contact with at least one structural stabilizer. Contacting the boehmite with at least one structural stabilizer can include forming a mixture comprising the boehmite material and at the least one structural stabilizer. The mixture can be a sol or a slurry. The treating preferably includes drying or spray drying the mixture, and calcining in an oxidizing atmosphere to obtain the stabilized support. Preferred structural stabilizers can include an element, such as cobalt, magnesium, zirconium, boron, aluminum, barium, silicon, lanthanum, oxides thereof, or combinations thereof; or can include precipitated oxides, such as a co-precipitated silica-alumina.

The invention relates to a tire having a circumferential rubber tread of a cap/base construction composed of a cap rubber layer as the tire running surface and an internal base rubber layer underlying said tread cap layer. The said tread cap layer is composed of a primary tread cap portion and one or two lateral tread cap portions of rubber compositions containing precipitated silica and/or rubber reinforcing carbon black reinforcement and wherein the rubber composition of at least one of said lateral tread cap portions contains a dispersion of short carbon fibers. Said primary tread cap portion contains a major portion of the running surface of the tread and is comprised of a silica-rich or carbon black-rich, preferably silica-rich, reinforcement-containing rubber composition, and said lateral tread portion(s) contains a minor portion of the running surface of the tread and is comprised of a silica-rich or carbon black-rich, preferably carbon black-rich, reinforcement-containing rubber composition. Where said primary tread cap portion is comprised of a silica-rich rubber composition, said lateral tread cap portion(s) is comprised of a carbon black-rich rubber composition and visa versa. The said tread cap portions are load bearing portions in the sense of extending from the running surface of the tread radially inward to said underlying tread base layer. In one aspect, the portioned rubber tread cap layer and the rubber tread base layer are co-extruded together to form a unitary composite thereof.

The present invention provides a hydrophobic precipitated silica having the following properties:

The present invention also provides methods for making and using the hydrophobic precipitated silica and articles and compositions which include the same.

A polishing composition includes silicon dioxide, an alkaline compound, an anionic surfactant, and water. The silicon dioxide is, for example, colloidal silica, fumed silica, or precipitated silica. The alkaline compound is, for example, potassium hydroxide, sodium hydroxide, ammonia, tetramethylammonium hydroxide, piperazine anhydride, or piperazine hexahydrate. The anionic surfactant is at least one selected from a sulfonic acid surfactant, a carboxylic acid surfactant, and a sulfuric acid ester surfactant. The polishing composition can be suitably used in applications for polishing a silicon wafer.

The invention relates to a method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder, which belongs to the technical field of integrative utilization of silicon iron alloy industrial waste resources and industrial kiln gas carbon dioxide. The method comprises the following process steps that: micro silicon powder is dissolved by sodium hydroxide hot alkali for preparing water glass; lime is prepared through lime stone calcination, and carbon dioxide raw material gas is released; precipitated silica is prepared through water glass carbonization; carbonization filter liquid is subject to sodium carbonate causticization for preparing sodium hydroxide solution to coproduce nanometer calcium carbonate; and the sodium hydroxide solution is circulated to a hot alkali dissolving and boiling kettle for dissolving micro silicon powder to prepare water glass. The method has the advantages that the process circulation of integrally utilizing the micro silicon powder for preparing the white carbon black cogeneration nanometer calcium carbonate is realized, and a new method is provided for goals of changing metallurgy chemical industrial waste materials into resources and utilizing the waste materials at high value.

The present invention relates to a tire having a rubber tread of a lug and groove configuration and of a co-extruded cap/base construction; wherein the tread cap is of a rubber composition which contains carbon black and is thereby of a black color; wherein a visible surface of at least one groove is of a rubber composition exclusive of carbon black and is of a non-black color and wherein said visible non-black colored rubber composition is a rubber layer which underlies said tread cap. Said visible non-black colored rubber is exclusive of any appreciable portion of, and preferably exclusive of, the surface of said tread lugs intended to be ground-contacting. In one aspect of the invention, said non-black colored rubber composition contains an amorphous precipitated silica reinforcement, preferably a pre-hydrophobated precipitated silica. In another aspect of the invention, said non-black colored rubber composition, and alternately, carbon black containing black colored rubber compositions adjoining said non-black colored rubber composition, is comprised a blend of at least one diene based elastomer and a brominated copolymer of isobutylene and p-methylstyrene together with an organo phosphite.

The invention provides a silicon rubber cross-linked flame-retardant cable material. The cable material is prepared from the following raw materials, by weight, 100 parts of silicon rubber, 20-30 parts of ethylene propylene diene monomer, 8-10 parts of chlorinated polyethylene, 15-20 parts of acetylene black, 0.5-1.0 part of dimethyl silicone oil, 0.2-0.5 parts of dicumyl peroxide (DCP), 20-30 parts of high-density polyethylene, 15-25 parts of calcium silicate, 0.5-1.0 part of modified argil, 30-40 parts of precipitated silica, 1-3 parts of a silane coupling agent, 0.2-0.5 parts of an antioxidant 4040, 0.5-1.5 parts of a promoter TMTD, 0.2-0.5 parts of a vulcanizing agent BP, 2-4 parts of tribasic lead sulfate, 12-15 parts of antimony (III) oxide, and 6-8 parts of zinc borate. The cable material has the advantages of excellent flame retardation, very less smoke in combustion, no generation of toxic gases or corrosive gases, good high and low temperature resistances, good corrosion resistance, good water resistance, good ozone resistance, and good ageing resistance.

Unique abrasive and/or thickening materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial characteristics depending on the structure of the composite in situ generated material. With low structured composites (as measured via linseed oil absorption levels from 40 to 100 ml oil absorbed/100 g composite), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Increased amounts of high structure composite materials tend to accord greater viscosity build and thickening benefits together with such desirable abrasion and cleaning properties, albeit to a lesser extent than for the low structure types. Thus, mid-range cleaning materials will exhibit oil absorption levels from an excess of 100 to 150, and high thickening/low abrasion composite exhibit oil absorption properties in excess of 150. Such an in situ, simultaneously produced precipitated silica/silica gel combination provides such unexpectedly effective low abrasion and high cleaning capability and different thickening characteristics as compared to physical mixtures of such components. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, as well as the different materials within the structure ranges described above and dentifrices comprising such.