Abstract: A process is disclosed for the preparation of styrene/acrylic type polymers which are useful in the sizing of paper. The process comprises polymerizing the monomers in an alcohol/water mixture at reflux temperature in the presence of a free-radical generating catalyst. The catalyst is added portion-wise over the course of the reaction and the resultant polymer is neutralized while substantially simultaneously separating the alcohol/water mixture and adding water to recover a product of less than 25% polymer solids.

Abstract: Polyimides with elevated Tg's are made by imidization of the product of reaction of dianhydrides with diaminobenzotrifluoride and bis(trifluoromethyl) oxydianilines when glass, boron, boron oxides, aluminum oxides or mixtures thereof are incorporated therein.

Abstract: There is provided a flexible, thin, rectangular, chemiluminescent device comprised of a back sheet of a laminated metal foil having heat sealed thereto at its edges a bi-component front sheet, the first component of which is a laminated metal foil and the second component of which is a transparent or translucent polyolefin sheet, said first and second components being heat sealed to each other at their adjacent latitudinal edge, from about 20% to about 50% of the surface area of said front sheet being comprised of said first component; temporary separation means positioned so as to divide the interior area of said device into two compartments, one under each of said components, the compartment under said second component having positioned therein an absorbent material containing a solvent solution of an oxalate and, optionally, a fluorescer, and the compartment under said first component containing an activator solution.

Abstract: The dewatering of waste industrial and municipal sludges is improved by the use of clay employed with an unsheared, water-soluble, branched cationic polymer having a solubility quotient greater than about 30% and a branching agent content of from about 4-80 molar parts per million, based on initial monomer content.

Abstract: A divider clamp assembly for use in compressing the opposed sidewalls of a tubular, flexible-walled container against one another, the assembly comprising a first member being substantially U-shaped in cross-section and a second member of substantially round cross-section, the interior surface of the first member conforming in shape with the exterior shape of said second member, the U-shaped member preferably having integral, sharp edged ribs extending lengthwise on its inner surface and having oval-shaped rings on each of its ends positioned such that the rings hold the second member within each interior thereof, the second member being enlarged on both ends such that it may not be separated from the first member but may be compressed into the interior of the first member to form a tight fit therewith.

Abstract: Improved filtration rates and decreased sodium chloride and moisture content in sodium bicarbonate filter cakes are obtained by including a filter aid containing a mono and/or dialkylester of sodium sulfosuccinate in the filter feed suspension.

Abstract: Complex N-hydroxyimide compounds and carboxy hydroxamic acid-functional derivatives thereof are prepared from organic amines reacted with maleate esters and maleic anhydride. The compounds exhibit strong metal ion chelating properties and are useful as detergent additives to improve stain removal.

Abstract: Iron is removed from concentrated alum solutions by contacting said solutions with a polymer containing hydroxamic acid or salt groups.

Abstract: Elongated granules of reinforcing fibers extending generally parallel to each other longitudinally within the granule substantially uniformly dispersed throughout a film forming latex binder composition. The granules provide complete dispersion of the fibers during their processing conserving physical properties of the fibers and provide improved handling and molding characteristics.

Abstract: Thermosetting epoxy resin compositions having improved flame retardancy having combined therewith an effective amount of a dihydroxymethyl phosphine oxide having the general formula ##STR1## wherein R represents an alkyl group having from 1 to about 8 carbon atoms or --R'OH where R' represents an alkylene group having from 2 to about 8 carbon atoms, are disclosed.

Abstract: Carbon fiber precursors are stabilized regarding their mechanical properties by conducting the stabilization procedure in at least two steps, the first at a temperature at which the maximum plasticity of the polymer is attained while stretching the fiber 10-50% and the second at 200.degree.-300.degree. C., but higher than the first.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrahydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, flame-retarded compositions of matter containing them and froth flotation processes therewith, are disclosed.

Abstract: The invention relates to a chemiluminescent article, which comprises a tube made of a flexible, light-transmitting and chemically stable material, closed at both of its ends, and which comprises at least two compartments which are filled with liquids which produce chemiluminescent light when mixed. The tube contains, between the ends, an internal diaphragm or disk, which separates the tube into said compartments. The diaphragm or disk has approximately a flat circular shape, with a cross-section which is approximately rectangular in profile, and is placed transversely with respect to the axis of the tube. The edge is in continuous contact with the interior of the wall of the tube.

Abstract: A process of profile modifying permeable soils with an environmentally safe composition of a non-toxic water-soluble polymer, a redox couple of a water-soluble ferrous salt and a non-toxic, oxidizing agent which are mixed in water and pumped into a subterranean formation wherein ferrous ion is oxidized to ferric ion to gel the polymer making the subterranean formation impermeable.

Abstract: Compositions comprising microparticles of a cross-linkable, glyoxalated (meth)acrylamide containing, polymeric material are disclosed. They are prepared using inverse mircoemulsion polymerization techniques and are useful as wet- and dry-strength agents in paper production.

Abstract: A high solids polymerization process for producing a water-soluble polymer wherein a mixture of exothermically polymerizable material in water is cooled to produce a cold syrup or crystalline slurry of the polymerizable material in a polymerizable material/water solution and said syrup or slurry is initiated to polymerization wherein the reaction is controlled by absorbing the exothermic heat of polymerization employing the sensible heat and/or the latent heat of fusion of the cooled syrup or slurry as a heat sink. This polymerization process is capable of being carried out in a batch as well as a continuous process.

Abstract: Functionalized polymer microparticles having particle diameters of from about 200 to about 4000.ANG. are prepared and are useful in facilitating a variety of flocculation and thickening of dispersions of suspended solids applications.

Abstract: Mannich (alk)acrylamide microparticles are produced at high solids contents without a significant increase in bulk viscosity by inverse microemulsion polymerization and provide superior dewatering characteristics.

Abstract: A process for the recovery of mineral values from base metal and precious metal ores is disclosed. Specifically, a froth flotation process is disclosed which comprises contacting an aqueous ore slurry with an effective amount of a dihydroxyalkyl group containing polysaccharide, a mineral collector and a frothing agent.

Abstract: Metals selected from the group consisting of zinc (II), cadmium (II), nickel (II), cobalt (II), manganese (II), iron (III) and copper (II) from aqueous solutions containing the same are extracted therefrom by contacting said solution with an extractant having the formula ##STR1## wherein R and R.sup.1 are, individually, selected from the group consisting of substituted or unsubstituted alkyl, cyloalkyl, alkoxyalkyl, alkylcycloalkyl, aryl, alkaryl, aralkyl and cycloalkylaryl radicals having 2-24 carbon atoms and X is hydrogen, ammonium or an alkali or alkaline earth metal salt-forming radical.