Abstract: A system and method for monitoring the dynamics of particle motion in a liquid-solid media including the rate of settling of particles, the identification of unsettled particle clouds, and the identification of unsettled particle clouds, and the identification and control of the bed level of settled particles in a slurry within a settler. The system includes an ultrasound transducer and a receiver for detecting echoes from particles in the slurry. The echoes are processed to determine the bed level of the settled particles, the position of unsettled particle clouds, and the rate of settling of the particle clouds.

Abstract: The filtration rate of Bayer Process primary settler overflow and/or the flocculation in the initial stages of the washer train in the Bayer Process are improved by contacting the settler feed stream or the feed stream to the first stages of the washer train first with a) a lower molecular weight polymer which contains hydroxamic acid and/or salt groups and then with b) a mixture of an anionic polymer and a second, higher molecular weight polymer which contains hydroxamic acid groups.

Abstract: A process is disclosed whereby an acrylamide homopolymer is prepared in microemulsion form whereby the microemulsion is clear and stable and the polymer solids content is at least 15%, by weight, the process being conducted in the absence of extraneously added salts of saturated, aliphatic, monocarboxylic acids.

Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric mixture of a polysaccharide and a material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

Abstract: A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a graft polymer of polyvinyl alcohol and an acrylamide.

Abstract: Process for producing agglomerates, e.g., by pelletizing a particulate inorganic material for example an ore material, characterized by the addition to the agglomerated material of an organic fibrous material, especially a polyacrylonitrile fiber material, to bind and thereby enhance the properties of the agglomerates and recovery of metal values therefrom.

Abstract: A bead composition is disclosed herein which comprises a core of a polyacrylonitrile homopolymer or copolymer and a surface of pendant N-haloamide groups. Also disclosed is a process for the production of said composition.

Abstract: Alkyl arsines are made by a reaction of gaseous arsine and the corresponding gaseous olefin in contact with at least one Bronsted acid catalyst. Products produced thereby are mono- and di-substituted arsines, e.g. alkyl and di-alkyl arsines, which contain substantially no metallic or oxygenating impurities.

Abstract: A novel method for preparing anionic, cationic or non-ionic polymeric microemulsions comprising a multi-step process to achieve high solids and low emulsifier and oil content. The polymeric microemulsions are useful in papermaking as retention aids, in solid-liquid separation as flocculants and in enhanced oil recovery as a drive fluid.

Abstract: Crimped acrylic fibers with a small diameter, a minimum aspect ratio in the 20-50 range, and having a crimp of greater than about 10% so as to enhance the viscosity of polymers, resistance to gravity-induced slumping when applied to vertical surfaces, and mix stability, as well as provide matrix reinforcement and toughness, are adapted to act as improved physical thixotropes in adhesives, sealants, coatings, paints, grouts, building materials and the like.

Abstract: Stable, water-in-oil emulsions are prepared wherein the aqueous phase thereof contains a water-soluble polymer and the oil phase thereof contains a partially esterified lower N,N-dialkanol fatty amine emulsifier by the emulsion polymerization of water-soluble monomers at a ratio of aqueous phase to oil phase of about 2 to 1 to about 3.5 to 1 and a monomer content of at least about 20%, by weight, wherein the polymerization is conducted in the presence of a second emulsifier comprising a non-ionic, reaction product of ethylene oxide and a long chain compound containing a reactive hydroxyl and/or carboxyl group and having an HLB of above 5 but less than 14, the total weight of the emulsifiers comprising about 1-5% of the emulsion wherein the second emulsifier constitutes from about 10 to about 150% of the weight of the fatty amide and contains less than 0.1 weight percent of sorbitan, sorbitol mixtures thereof and derivatives thereof.

Abstract: A process for flocculating, in a liquid other than Bayer process streams, suspended solids comprised primarily of minerals other than iron oxide and tin oxide. The solids are contacted with a hydroxamated polymer. The amount of hydroxamated polymer is sufficient to increase the settling rate of the solids and to decrease the turbidity of the solids.

Abstract: Novel s-triazine compounds containing at least one N,N-bis(alkoxy or hydroxyalkoxy-carbonyl-amino C.sub.2 -C.sub.10 alkyl) amino substituent function in self-condensation and as cross-linkers for compounds containing active hydrogen groups. The compositions cure to coatings with excellent properties, especially corrosion resistance, humidity resistance, abrasion resistance and flexibility. The coatings have excellent exterior durability.

Abstract: Glycoluril based amino resin powder coating compositions have improved flow out and viscosity characteristics when a rheology improving additive selected from alkali metal oxides, alkali metal hydroxides, alkali metal carbonates, alkaline earth metal carbonates, alkaline earth metal oxides, alkaline earth metal hydroxides, aluminum oxides, aluminum hydroxides, aluminum carbonates, zinc salts of long chain fatty acids, aluminum salts of long chain fatty acids, monoamines, dismines, or mixtures thereof are added.

Abstract: Substantially alternating, organic solvent soluble copolymers of 2000 to 4000 molecular weight useful as crosslinking agents and containing monomeric units derived from monomers comprising (i) 40 to 50 mole percent of an isopropenyl-.alpha.,.alpha.-dimethylbenzyl isocyanate, and (ii) 60 to 45 mole percent of an unsaturated ester are described together with processes for their preparation. Curable compositions containing the copolymer and an isocyanate reactive material are also described.

Abstract: A novel, one component self-crosslinking resin and a process for its preparation are provided. The resin is the copolymer of:(I) N-hydroxysuccinimide-blocked meta-isopropenylalpha, alpha-dimethylbenzyl isocyanate;(II) a hydroxy group-containing ethylenically unsaturated monomer such as hydroxyethyl acrylate; and(III) optionally, an ethylenically unsaturated monomer free of hydroxy groups such as methylmethacrylate or butyl acrylate.The copolymers are useful as thermally stable fast curing one component resins for paint, and produce, upon heat curing, films and objects with good hardness and solvent resistance.

Abstract: An improved process for preparing a one component self-crosslinking resin is provided. The process for making the self-crosslinking resin is carried out by copolymerizing an oxime-blocked m-isopropenyl-alpha, alpha-dimethylbenzyl isocyanate (m-TMI), hydroxyethyl acrylate, and another unsaturated monomer at 75.degree. C. to 85.degree. C. in a polar organic solvent having a dipole moment of at least 3, such as acetonitrile. The polar solvent retards the thermal deblocking of the blocked TMI, thereby preventing the premature self-crosslinking and gelation of the copolymerization product prior to its use as a self-crosslinking resin.

Abstract: The invention relates to high pressure decorative laminates containing an air-laid web as a substrate and to a method of preparing such a decorative laminate from an assembly comprising said substrate and a thermosetting resin impregnated decor sheet.

Abstract: Certain mixtures of polyanionic and polycationic polymers are effective inhibitors of magnesium hydroxide scale formation in evaporative desalination units.

Abstract: A heat and pressure consolidated structure comprising, in superimposed relationship,(A) a self-supporting substrate, and(B) a decorative .alpha.-cellulose paper sheet impregnated with a composition comprising(1) a blend of an aqueous melamine/formaldehyde resin solution and from about 2% to about 20.0% of an ethylene glycol or (2) an aqueous solution of the resinous reaction product of melamine, formaldehyde and from about 2.0% to about 20.0% of an ethylene glycol, is disclosed.