Occidental Chemical Corporation

Hooker Chemicals & Plastics Corporation

Other

George T Miller

Russell J Morgan

Gerald L Evarts

Harry E Buckholtz

Plastic molded articles having low friction and excellent wear resistance are produced by treating the surface of the plastic article with an aqueous solution of an inorganic fluoride such as hydrogen fluoride. Plastic articles which can be made in accordance with the invention include plastic brake pistons, bearings, motors and drives, commutators, slip ring alternators for DC drive motors, thrust washers, spacers and reactors, clutch plates, electrical switching equipment with sliding parts, gears, pulleys for belt drives, such as cog belt pulleys, V-belt pulleys and poly V-belt pulleys, gas meter discs, and the like. In addition to the treatment step, the plastic articles are neutralized, washed and dried.

Low friction, wear resistant plastic parts

Disclosed is a method of making a eutectic mixture of copper and tricopper phosphide by reacting elemental copper with phosphine. The elemental copper is heated to a temperature above about 714.degree. C. and the liquid eutectic mixture runs off of the cooper as it is formed, exposing more copper for reaction. The liquid eutectic mixture can be used as a source of copper and phosphorus in making metal alloys.

Method of making eutectic mixture of copper and tricopper phosphide

Compositions of nickel, iron and phosphorus, are prepared by fusing nickel and ferrophosphorus in an inert atmosphere, with the nickel preferably comprising from about 5% to about 70% by weight of the composition. The fused composition is ground or atomized to form a conductive, corrosion resistant pigment, preferably having a particle size of from about 0.1 to about 15 microns. This pigment can then be incorporated into a suitable resin binder, optionally with one or more other suitable metals such as zinc or nickel, to prepare corrosion resistant coatings, weldable coatings, EMI shielding coatings, electrostatic dissipation coatings, or electrically conductive coatings.

Compounds of nickel, iron and phosphorus

A hot-dip galvanized coating for improved resistance welding of galvanized steel parts or sheets includes particles of a metal phosphide, and preferably ferrophosphorus particles, having a particle size of from about 0.1 to about 30 microns such particles being included in the galvanized coating while the zinc is still molten. The coating can also include up to about 40% by weight of the metal phosphide of an additional metal such as nickel, tin, aluminum or lead, which can be incorporated in the coating as discrete particles or deposited onto the surface of the metal phosphide particles. The advantages of the present invention include a significant reduction in welding current and an increase in electrode life, as well as simplified application of the coating by incorporating the metal phosphide particles directly into existing coating lines.

Hot-dip galvanized coating for steel

A ferrophosphorous composition with improved conductivity and passivation resistance in prepared by treating ferrophosphorus particles with an aqueous solution containing a dilute mineral acid and ions of chromium and metal selected from the group consisting of zinc, strontium, calcium, barium, lead or copper. In a preferred embodiment, the concentration of chromium and zinc ions in the solution is in the range of about 2 grams/liter to about 10 grams/liter, and the treatment time is from about 2 to about 6 minutes. The treated ferrophosphorous particles can be formulated in a suitable resin binder for use as corrosion resistant coatings, weldable coatings, EMI shielding coatings or electrically conductive coatings. The treated ferrophosphorus particles can also be used in powder metallurgy applications.

Ferrophosphorous composition having improved conductivity and

A ferrophosphorus composition with improved conductivity and passivation resistance is prepared by treating ferrophosphorus particles with an aqueous solution containing a dilute mineral acid and ions of chromium and a metal selected from the group consisting of zinc, strontium, calcium, barium, lead or copper. In a preferred embodiment, the concentration of chromium and zinc ions in the solution is in the range of about 2 grams/liter to about 10 grams/liter, and the treatment time is from about 2 to about 6 minutes. The treated ferrophosphorus particles can be formulated in a suitable resin binder for use as corrosion resistant coatings, weldable coatings, EMI shielding coatings or electrically conductive coatings. The treated ferrophosphorus particles can also be used in powder metallurgy applications.

Ferrophosphorus composition having improved conductivity and passivation

A rodenticide is disclosed comprising an encapsulated zinc phosphide toxicant, a bait, and a binder for adhering the encapsulated zinc phosphide to the bait, said binder comprising a polyol or a sugar-containing fluid. The encapsulant is a thermoplastic polyamide, preferably nylon, present in an amount of from about 2% to about 10% by weight of zinc phosphide. When the bait is a grain or a processed grain, a zinc salt is preferably added to the rodenticide to inhibit the generation of phosphine. Histamine, a histamine salt or a histamine-producing substance, such as red pepper, can also be added to the rodenticide to stimulate acid secretion in the stomach of the rodent. A particulate encapsulated product is also disclosed comprising a core of zinc phosphide having a coating of a thermoplastic polyamide present in the range of from about 2% to about 10% by weight. The encapsualted product is a small particle capable of passing through a 40 mesh size screen.

Encapsulated efficacious zinc phosphide rodenticide

A rodenticide composed of particulate zinc phosphide which has been encapsulated with a layer or coating of a thermoplastic polymer. This polymer coating will inhibit reaction, in the rodent's mouth so that the zinc phosphide will be consumed without the rodent detecting its' presence. However, the coating will allow reaction of the zinc phosphide in the rodent's stomach which will cause the death of the rodent.

Cellulosic materials such as paper, wood, cotton, rayon and the like are rendered flame retardant by the intimate association therewith of an effective flame retardant amount of a reaction product of aqueous solution of sulfamic acid and an alkylene oxide e.g., ethylene oxide. Amounts of said reaction product of at least, and preferably in excess of, 0.5 percent by weight are generally effective to render the cellulosic material flame retardant. Preferably the reaction product is rendered neutral before or after application to the cellulosic material in order that the material be rendered noncorrosive and nonirritating in nature.

Flame retardant cellulosic materials

Normally flammable fabrics, such as fabrics composed of polypropylene and polyamides such as polycaproamides, poly(m-phenyleneisophthalamides) and the like which have been rendered flame proof by the intimate association therewith of a flame proofing amount of a phosphoric acid and reacted in situ with an epoxy compound. The resultant compositions can be washed in water without substantial loss in flame proof character.

Durably flame proofed textile materials

Normally flammable fabrics, such as fabrics composed of polypropylene and polyamides such as polycaproamides, poly(m-phenyleneisophthalamides) and the like which have been rendered flame proof by the intimate association therewith of a flame proofing amount of a phosphoric acid are reacted in situ with an epoxy compound. The resultant compositions can be washed in water without substantial loss of flame proof character.

Growing community of inventors

Lewiston, NY, United States of America

George T Miller