Abstract: Dry process for the production of inorganic granular substances coated with plastics, characterized in that a radical-polymerizable vinylic monomer carried on the surface of an inorganic granular substance is brought in a gaseous phase into contact with gaseous sulfur dioxide to effect polymerization of the monomer. The resulting plastic-coated inorganic substances are useful in various fields of industry, for example, as fillers, construction materials, molding materials, electrode materials, delayed-action fertilizers, etc.

Abstract: In order to reduce the tendency to decompose of particles or granules of alkali metal chlorites and to enhance their stability, said particles or granules are completely coated with an inorganic salt or a mixture of such salts which are compatible with the chlorite and with each other, e.g. nitrates, carbonates, bicarbonates, phosphates, silicates and chlorides, especially alkali metal salts and alkaline earth metal salts thereof. The coating may be carried out by any conventional coating process, e.g. by contacting the particles with a solution of the stabilizing salts under vaporizing conditions in a rotating inclined disk, a rotary drum, or in a fluidized bed.

Abstract: Chrysotile asbestos is chemically opened into the individual fibrils by soluble vinylic polymer polyelectrolytes containing carboxylic acid groups in aqueous media. Polyacrylic acids, polymethacrylic acids, maleic anhydride polymers and water-soluble copolymers thereof are preferred polyelectrolytes and form stable colloidal dispersions. The polyelectrolytes are neutralized to alkaline pH with inorganic or organic bases, but preferably with basic vinylic monomers when complete encapsulation is desired. By a further aspect of the invention the polyelectrolyte-coated fibrils in aqueous dispersion are encapsulated by copolymerization with (a) a basic vinylic comonomer (used for pH control) such as dimethylaminoethyl methacrylate, t-butylaminoethyl methacrylate or a vinylpyridine; and (b) a non-basic vinylic comonomer such as styrene, divinylbenzene, vinyl chloride or fluoride, vinyl acetate, methyl methacrylate, ethyl acrylate, acrylonitrile, and methacrylonitrile.

Abstract: In order to prevent breakage of a quartz fluidized bed reactor utilized in the production of silicon, the reactor is cooled as soon as a thin layer of silicon is formed on the reactor walls and then reheated to continue silicon growth. In this manner, the thin layer of silicon shatters and forms a weak foundation for subsequent silicon deposition on the reactor wall when the silicon deposition is continued. Subsequently deposited silicon on the walls continuously peels off without breaking the reactor.

Abstract: The invention relates to the gettering of hydrogen and its isotopes, the gettering materials being painted or coated onto, or otherwise disposed in an area or volume from which hydrogen is to be removed.

Abstract: Method and apparatus are described for applying a wax or plastic coating to phosphor grains to be added to explosives for tagging purposes. The coating is obtained by spraying from a nozzle a homogenous mixture of molten coating material and phosphor grains and permitting the droplets thus formed to solidify during free fall through a cooling medium such as air. The coated phosphors thus obtained when incorporated into an explosive render the mixture less sensitive to friction and impact than the corresponding mixture employing uncoated phosphors.

Abstract: A transition metal compound in powdered form or a mixture of a transition metal compound and other inorganic compounds in powdered form can be effectively coated with a polymer by contacting such powder with a vinyl monomer in the presence of hydrogen sulfite ions (HSO.sub.3 .sup.-).

Abstract: Concrete blocks and similar inorganic non-metallic building components may be provided with a glass coating on an external surface by flame spraying. The surface to be coated usually is heated prior to spraying.

Abstract: A procedure for tagging sand with a radioisotope for use in the study of sediment transport involves the precipitation of a metal radioisotope in the form of an iodide directly on the sand, followed by heating the sand to a temperature sufficient to effect a phase transformation of the sand and a decomposition of the metal iodide, leaving the metal firmly attached to the sand.

Abstract: The caking tendency of ammonium salt compositions during storage is reduced by coating the compositions with a minor amount of a hydroxy-aluminum polymer.

Abstract: Particulate solids are coated with a polymer by bringing a particulate solid selected from glass particles, abrasive particles and sand particles into contact with a vinyl monomer in the presence of a polymerization intiator consisting essentially of bisulfite ions.

Abstract: A method of producing a fuel particle is disclosed, which comprises forming hollow spheroids which have a mass number greater than 50, immersing said spheroids while under the presence of pressure and heat in a gaseous atmosphere containing an isotope, such as deuterium and tritium, so as to diffuse the gas into the spheroid and thereafter cooling said spheroids up to about 77.degree. Kelvin to about 4.degree. Kelvin.

Abstract: A material having a vapor pressure of at least 5 mm Hg at 490.degree.C. and selected from aromatic and cycloaliphatic hydrocarbons and alkyl derivatives thereof, nitrogen-, oxygen- and sulfur-containing compounds having hetero rings and alkyl derivatives thereof, substituted compounds of these compounds, and substances containing these compounds is used as starting material. Such starting material is brought into contact in a vapor state, if necessary, diluted with an inert gas, with a substrate heated at a temperature of 600.degree.-1500.degree.C. thereby depositing the resulting isotropic pyrolytic carbon on the substrate.

Abstract: A plant seed having a controlled germination time is prepared by enveloping the seed in a continuous coating of a film forming composition comprising a water insoluble polymer and polyvinyl alcohol with said coating being of a thickness of from about 0.01 to about 0.15 millimeter and having an oxygen transmission sufficiently high to maintain viability of the seed.

Abstract: A protective coating consisting of an aluminum or magnesium phosphate complex is used to encapsulate a wide variety of organic and inorganic particles. The coating is particularly applicable to organic and inorganic pigments and serves to improve the light, heat and chemical stability of these pigments. The coating is formed in situ by complexing the phosphate with the metal, preferably in the presence of ions of fluoride or fluoborate and depositing the same onto the surface of the particles.

Abstract: Tooth enamel is treated with a dental etching acid to leach out the positvely charged calcium ions therefrom and to provide a roughened, porous, sponge-like appearing surface which is negatively charged. Said surface is treated with the positively charged ions of the heavy metals which are ionically attracted to said negatively charged surface and deposited into and on said sufrace which is remineralized with said heavy metal ions to form a relatively smooth surface like that of the original tooth enamel before the acid etch. Thereafter, the heavy metal covering said surface is converted into the corresponding heavy metal sulphide which is resistant to decay and to caries producing acids.

Abstract: A method of manufacturing molded structures and coatings based on curable inorganic binding agents and water which comprises coating shape-imparting surfaces made from materials such as wood, plaster, plastic or iron, with a mixture containing a curable organosilicon compound, a solvent and finely dispersed solid particles, such as silicon dioxide, quartz powder, diatomaceous earth and silicious chalk, applying the building materials, curing and removing the molded structures.

Abstract: A method of coating electrostatographic carrier particles comprising introducing an upwardly flowing low pressure gas and a centrally located upwardly flowing high pressure gas at about one-third their full flow rate into a combined fluidized bed and spouted bed coating apparatus, loading carrier particles into the coating apparatus, increasing the flow rate of the low pressure gas to its full flow rate of about 305 cubic feet per minute with heating to heat the carrier particles, increasing the flow rate of the high pressure gas to its full flow rate of about 16 cubic feet per minute at about 1.

Abstract: A Method of coating particulate materials (such as silica sand, glass beads, seeds and metal particles) with a liquid thermosetting epoxy resin which comprises agitating the epoxy resin with the particles in a nonpolar liquid, which is immiscible with the epoxy resin, and contains a nonionic surfactant having a molecular weight of at least 2,000 to retard the tendency of the epoxy coated particles to agglomerate during curing of the resin in the non-polar liquid. A suitable liquid for use as the immiscible liquid is a paraffinic oil which is aromatic-free and olefin-free.

Abstract: Metal powder is suspended in an aqueous medium containing a radical-polymerizable monomer and polymerization is conducted in the presence of an acidic sulfite ion to produce a plastic coated metal powder which is effectively used for forming conductive plastics, molded articles for sintering, pressed powder magnetic cores and the like.