Abstract: A conductive metal-filled substrate is formed by intermingling copper or nickel particles into the substrate, contacting the metal particles with a specified developing agent, and heating the metal particles and the developing agent. The filled substrates are electrically conductive and are useful for a variety of uses such as EMI shielding.

Abstract: Epoxy resins can be cured by the use of a curing agent formed by the reaction of phosphorus pentoxide with a trialkyl phosphate or phosphonate.

Abstract: Melamine pyrophosphate is made by the direction reaction of pyrophosphoric acid and melamine in an aqueous reaction medium at a temperature of from about 0.degree. C. to about 60.degree. C., preferably from about 0.degree. C. to about 20.degree. C.

Abstract: The yield of metal alkoxides formed by refluxing an alcohol-containing liquid, also containing catalyst, from a reactor vessel into a reflux column containing reactive metal is provided. The yield of the desired alkoxide is increased by withdrawing a portion of the alcohol reactant and catalyst from the reactor and introducing them into the column above the position occupied by at least a portion of the metal. The thus introduced catalyst-containing alcohol reactant makes contact with the metal and thereby increases the yield of metal alkoxide as it is allowed to flow back into the reactor vessel.

Abstract: The activity of olefin polymerization catalysts comprising a Group IVB transition metal compound and an aluminoxane can be improved by the addition of a hydroxysiloxane compound.

Abstract: Hexaalkyldisilthiane compounds (e.g., hexamethyldisilthiane) are synthesized by reaction of lithium disulfide and a halotrialkylsilane (e.g., chlorotrimethylsilane) in a non-oxygenated solvent (e.g., acetonitrile).

Abstract: A dialkyl dicarbonate (dialkyl pyrocarbonate) is prepared by contacting an alkyl haloformate (such as ethyl chloroformate) with an alkali metal carbonate (such as potassium carbonate) in the presence of a catalytic amount of a crown ether (such as 18 crown 6) and a solvating amount of a solvent (such as acetonitrile). The process of the invention is easy to carry out, it does not employ particularly hazardous materials, and provides a high yield of dicarbonate.

Abstract: Metal oxide superconductors of the yttrium-barium-copper type can be formed by precipitation from an aqueous solution of the salts of the metals using an oxalate precipitation reagent under basic pH conditions to form a fireable precursor only partly in the form of the oxalate salts of these metals.

Abstract: A process for the reduction of carbonyl compounds by an alkali or alkaline-earth metal borohydride in the presence of a phase transfer catalyst which is an N-benzyl-N,N-bis (2-hydroxyethyl)cocoammonium halide.

Abstract: Flame retardant polyester compositions are prepared by incorporating into a polymer from 1-20% by weight of a flame retardant having the structural formula: ##STR1## where Ar is aryl and R and R' are independently alkylene. This class of flame retardant shows high temperature stability and permits incorporation of the flame retardant into the polyester by hot milling at temperatures up to about 390.degree. C.

Abstract: An apparatus to provide a vaporized reactant for chemical-vapor deposition is disclosed. The apparatus employs a heated quartz reactant reservoir, quartz lines, a quartz valve and, optionally, a purge system. The apparatus may also include a quartz refill reservoir and heating means for the quartz lines. The purge system may be a vacuum purge system.

Abstract: Fatty acid amides (such as ditallow amidoethyl imidayoline are prepared by reacting a fatty acid (such as tallow acid) with an amine, particularly an alkyl polyamine (such as diethylene triamine). The products are rendered low in color by the addition of hypophosphorous acid and a hindered phenol compound.

Abstract: A process for purifying calcium carbonate ore by the removal of silicate impurities from the ore by reverse flotation. The process achieves high yields and low acid insoluble content of the calcium carbonate product by employing novel collectors. These novel collectors which characterize the invention comprise organo-nitrogen compounds including propoxylated quaternary ammonium compounds, unsymmetrical dialkyl dimethyl quaternary ammonium compounds and dialkyl hexahydropyrimidine compounds.

Abstract: There are disclosed multiphosphorus-containing compounds comprising phosphonate-containing or phosphate-containing phosphate esters. The compounds can be prepared by: (a) reacting a phosphonate-containing or phosphate-containing alcohol with phosphorus pentoxide following by reaction with an epoxide, (b) reacting a phosphonate-containing or phosphate-containing alcohol with a phosphorus oxyhalide, hydrolyzing any phosphorus halogen bonds and then reacting the resulting phosphoric acid derivative with an epoxide, (c) transesterifying a phosphonate-containing or phosphate-containing alcohol with a dialkyl phosphite, oxidizing the resulting compound to yield a phosphoric acid derivative and reacting the phosphoric acid derivative with an epoxide. The compounds are useful as flame retardant additives for polyurethanes and textiles.

Abstract: Hexaalkylcyclotrisilthiane compounds (e.g., hexamethylcyclotrisilthiane) are synthesized by reaction of lithium disulfide and a dihalodialkylsilane (e.g., dichlorodimethylsilane) in a non-oxygenated solvent (e.g., acetonitrile).

Abstract: There are disclosed novel phosphorous-containing compounds including and derived from hydrogen phosphonates. The compounds of the present invention can be prepared by reacting a hydrogen phosphonate with: (a) an ethylene derivative in a Michael reaction, (b) an amine or amide and formaldehyde in a Mannich reaction, (c) an aldehyde or ketone, (d) a halogen, (e) carbon tetrachloride and an alkylamine, and (f) carbon tetrachloride and a hydroxyphosphate. Halophosphonates produced according to procedure (d) can also be used in reactions with (a) alkylamines and (b) hydroxyphosphonates or epoxides to produce the compounds of the present invention.

Abstract: There are disclosed novel phosphorous-containing compounds including and derived from hydrogen phosphonates. The compounds of the present invention can be prepared by reacting a hydrogen phosphonate with: (a) an ethylene derivative in a Michael reaction, (b) an amine or amide and formaldehyde in a Mannich reaction, (c) an aldehyde or ketone, (d) a halogen, (e) carbon tetrachloride and an alkylamine, and (f) carbon tetrachloride and a hydroxyphosphonate. Halophosphonates produced according to procedure (d) can also be used in reactions with (a) alkylamines and (b) hydroxyphosphonates or epoxides to produce the compounds of the present invention.

Abstract: Polyether flexible urethane foams are rendered flame laminatable by use of a combination of an organophosphorus additive to confer flame laminatable properties on the foam and a polyalkylene glycol additive to improve the flame laminatable properties. A halogenated flame retardant is preferably also contained in the foam.

Abstract: Novel polyol ester/triaryl phosphate ester blends comprising a third liquid component are disclosed. They have particular utility as ultra high temperature lubricants, at temperatures in excess of 1000.degree. F. Preferred component compositions and percent weight ranges are also disclosed.

Abstract: A semiconductor fabrication having thermal characteristics comparable to hybrid ceramic packages comprises a flexible copper foil printed circuit on a thin polyimide film layer thermally laminated to a metal surface, such as aluminum, with a high temperature thermal plastic, such as polyetherimide. A semiconductor die is attached to a relatively thick metal heat spreader which in turn is attached to at least a portion of the copper foil. The resultant structure is a semiconductor package which has a thermal performance comparable to that of typical hybrid ceramic packages.