Abstract: Deeply colored carbon black having a low content of extractable matter and a primary particle size of about 8-25 nanometers is made by the gas black process using as the carrier gas for the vapors of the carbon black forming oil a hydrogen rich mixture containing over about 50 volume % hydrogen and then collecting the separated carbon black deposited on a cooling roll.

Abstract: This disclosure relates to a certain class of carbon black products having high surface area and very low degree of porosity and the use thereof as reinforcing additives in the preparation of rubber compositions having improved properties.

Abstract: The reaction of certain organic .alpha.-hydroxy carboxylic acids with ferric ions produces nutritive stable water soluble yellow colors suitable for use in food products.

Abstract: A non-crystallizing and non-flocculating pigment composition comprising as the base material a base organic pigment sch a phthalocyanine and as the additive a specified derivative of a starting organic pigment such as phthalocyanine.

Abstract: An alkali metal corrosion resistant vacuum tight metal-to-ceramic seal is formed between a high alumina ceramic body and a refractory alkali metal resistant metal member, such as Cb-1Zr, by interposing a powdered brazing mixture comprising by weight a majority of elemental columbium powder and a second metal powder selected from the class consisting of iron and nickel, and firing the assembly in vacuum at a temperature between 1500.degree.C and 1675.degree.C to partially melt a portion of the powder to form a melted bonding phase component interstitially of the undissolved columbium particles for bonding the ceramic to the metal part.

Abstract: A method, wherein an electromagnetic field is established in which a precipitate of pigments is formed from aqueous solutions of the salts of metals in the presence of ferromagnetic solids, whereupon the precipitate is treated to obtain a finished form of pigment.

Abstract: A method for preparing an extended corrosion inhibiting pigment for use in formulating protective coatings for ferrous substrates in which a particulated inert carrier is slurried in an aqueous solution in the presence of molybdic oxide, to which a metal oxide of zinc, calcium, strontium and/or barium is added in a manner to effect a deposition of the corresponding metal molybdate on the carrier particles, whereafter the coated carrier is separated, dried and calcined at an elevated temperature.

Abstract: This invention relates to a new and useful coating for protecting surfaces. The coating is not only decorative but is resistant to chemicals, abrasives, and to weather. The invention consists of adding fragmented glass bubbles to a protective coating solution such as paint. Prior to fragmentation of the glass bubbles they are treated with either a hydro or oleo phobic agent which will cause the fragmented bubble pieces to rise to the paint's surface. The fragmented bubbles form a glass surface when the protective coating is applied to a substrate. The untreated surfaces of the glass bubbles, that is the interior portion of the glass bubble prior to fragmentation, form a bond between themselves and the protective coating.

Abstract: Precipitated silicas having very high structure as defined by the ability of the silica material to hold water in its wet cake, high oil absorption, and very high surface area can be produced by controlling the rate of acidulation during their production and maintaining the same at a very low rate during the course of the addition of acid to the solution of alkali metal silicate. The control of the index of refraction of the silica so produced is achieved by introduction of controlled amounts of adduct material such as aluminum sulfate to the acid prior to its introduction to the silicate solution.

Abstract: The invention relates to the process for recovery of carbon black of controlled quality from scrap-rubber vulcanizates. Scrap rubber is selected on the basis of the quality of the carbon black used in the preparation of the rubber from which the scrap is obtained. The scrap is continuously pyrolized to produce a product composed largely of the carbon black originally present in the scrap. The recovered carbon black is ground and may be used as a reinforcing agent as such, or optionally it may be pelletized to facilitate handling.

Abstract: A method of modifying the surface properties of particulate mineral materials by forming on the surface of the particles a coating having a significant number of acidic sites with pKa values of less than 2.8.

Abstract: A method of modifying the surface properties of particulate mineral materials by forming on the surface of the particles a coating having a significant number of acidic sites with pKa values of less than 2.8.

Abstract: Heat dried, finely-divided compositions of optical brighteners and fillers comprising as said fillers at least partly of a finely-divided water-insoluble silicate compound containing at least some combined water and having a calcium binding power of at least 50 mg CaO/gm of anhydrous active substance and the formula on the anhydrous basis(M.sub.2 /.sub.n O).sub.x . Me.sub.2 O.sub.3 . (SiO.sub.2).sub.ywhere M is a cation of the valence n, exchangeable with calcium, x is a member of from 0.7 to 1.5, Me is a member selected from the group consisting of aluminum and boron, and y is a number from 0.8 to 6, preferably from 1.3 to 4, in an amount of at least 5% by weight of the mixture, as well as a process for producing the same comprising the steps of mixing said silicate compound, while at least still moist from its production, with said optical brighteners and converting the entire mixture of components into a pourable product.

Abstract: A method for controlling the viscosity of dispersed clay slurries is disclosed. In accordance with the invention the problem associated with shipping or storing clay slurries in tank cars or tanks, that is, significant increases in the viscosity of the slurry which often results in the formation of a gelled mass, is overcome by the addition of the pentasodium salt of diethylenetriamine pentacetic acid (DTPA). The addition of the diethylenetriamine pentacetic acid salt serves to control the viscosity of the clay slurry in a manner such that it remains at a substantially uniform and low level even when the slurry is shipped or stored over extended periods of time. The diethylenetriamine pentacetic acid pentasodium salt is added to the slurry in relatively small quantities, i.e., up to 5.0 pounds/ton clay and unexpectedly does not affect the properties or characteristics of the clay pigment or product.

Abstract: Chromium oxide pigments intimately admixed with an alkoxylated alkyl sulphonamide to obtain a pigment having a low degree of flocculation.

Abstract: A process for producing precipitated silicic acid pigments having new and improved properties is disclosed. The pigments are produced by the simultaneous introduction of a solution of an alkali metal silicate and an acid, such as sulfuric acid, into an aqueous receiving medium which contains a salt or electrolyte. The pH of the aqueous receiving medium is adjusted prior to the introduction of the acid and silicate so that it is the same or equal to that pH at which the precipitation of the pigment is effected. The electrolyte is preferably a metal salt of the acid used for acidulation of the silicate. The acid and silicate are added to the receiving medium at a rate such that the precipitating pH is maintained constant. The products of the invention are characterized by their high abrasiveness and have a relative cleaning ability or scale (RCS) equivalent to high grade phosphates used as polishing agents in toothpastes and a superior fluoride compatibility to that of said phosphates.

Abstract: A chemical species, present in two oxidation states which differ from one another by one equivalent, is added to pigment materials to serve as a recombination center for alternately capturing electrons and holes produced by the pigment materials when they are subjected to ultraviolet light exposure.

Abstract: Compounds falling within the formula: ##EQU1## in which Pc represents the residue of a phthalocyanine, R.sub.1 represents an alkyl group of low molecular weight or a cycloalkyl group, R.sub.2 represents a hydrogen atom, an alkyl group of low molecular weight or a cycloalkyl group, R.sub.3 represents a hydrogen atom or an alkyl group of low molecular weight, R.sub.1 and R.sub.2 or R.sub.1, R.sub.2 and R.sub.3 may also form a heterocyclic residue with the nitrogen atom and m and n each represent a whole or fractional number from 1 to 4; mixture of phthalocyanine pigments comprising a phthalocyanine pigment unstable to flocculation or sedimentation and at least one compound of the above formula; process for the stabilization of a phthalocyanine pigment comprising incorporating therein at least one compound of the above formula; process for the preparation of a compound of the above formula comprising reacting a phthalocyanine-sulphonate of the formula:Pc (SO.sub.3 M).sub.

Abstract: Oxygenated furnace black products are disclosed which have a particle size of at least 15 millimicrons, a dibutylphthalate absorption (DBP) not exceeding 120 c.c./100 gms., a nitrogen surface area of at least 450 m.sup.2 /gm., and an oxygen content of at least 4 weight percent.These products can be produced by treating a furnace carbon black feedstock with an oxidizing agent, such as nitric acid, in order to substantially increase the volatile and the oxygen content of the black.

Abstract: Improved reactive color developing substrates for manifold copy systems are produced by controlled acid treatment of smectite clay minerals, followed by severe attrition grinding to produce an aqueous colloidal suspension of the acid treated smectite. Thereupon, the colloidalized acid treated smectite is combined with an aqueous suspension of talc, thoroughly blended and co-precipitated by the addition of appropriate flocculants such as aluminum sulfate.