Showing papers on "Sodium hypophosphite published in 1971"

Stabilized polyamide compositions

Abstract: Heat stabilized synthetic polyamide compositions are prepared by incorporating therein a mixture of a phenolic antioxidant and metal hypophosphite, a copper compound and metal halide. A typical embodiment includes polyamides which are stabilized with 1,2-bis[3,5-di-t-butyl-4-hydroxyphenyl)-propionamido]ethane and sodium hypophosphite, copper acetate and potassium iodide.

Magnetic alloy particle compositions and method of manufacture

Abstract: This invention relates to the preparation of magnetic recording media including finely divided magnetic particles. It especially relates to the preparation of high coercivity, finely divided magnetic alloy particles for use in recording media by reduction of salts of cobalt, and mixtures of salts of cobalt and iron, mixtures of salts of cobalt and nickel, in a bath containing hypophosphite and amine borane anion reducing agents. Sodium hypophosphite and dimethyl amine borane or any soluble salts which provide hypophosphite and amine borane anions in solution are reacted with soluble metal salts of cobalt alone, or cobalt with iron, or nickel dissolved in the bath. After separating and drying, the precipitate is found to consist of non-pyrophoric magnetic alloy particles, including about 0.1-5% phosphorus and about 0.1-1.5% boron, which are generally spherical in shape and which vary in size from about 0.01 micron to 3.0 microns in diameter. These particles are dispersed in a binder, the dispersion coated on a substrate, and dried to form a recording media.

Chemical plating solutions

Abstract: AN AQUEOUS CHEMICAL PLATING SOLUTION FOR DEPOSITING A METAL SUCH AS NICKEL, COBALT, COPPER OR IRON ON A CATALYTIC SUBSTRATE, USING A REDUCING AGENT SUCH AS FORMALDEHYDE, SODIUM HYPOPHOSPHITE OR A BORANE, PARTICULARLY AN ALKALI METAL BOROHYDRIDE, IS STABILIZED AGAINST DECOMPOSITION BY CONTAINING THEREIN AN ALKALI METAL CYANOBOROHYDRIDE.

Improvements in or relating to the electrodes deposition of films on substrates

Abstract: 1,236,250. Electroless plating. WELWYN ELECTRIC Ltd. Oct. 21, 1969 [Oct. 18, 1968], No. 49498/68. Heading C7F. A substrate of e.g. a ceramic is plated with a pattern of e.g. Fe, Co or Ni with or without P, B or S or Cu or Ag. by applying an organic photoresist containing dissolved therein a salt, resinate or other compound of Pd, Pt or Au, irradiating the resist through a mask, developing, burning of the resist to leave the free metal and then immersing in an electroless plating solution. A Pd pattern may be reduced prior to plating by exposing to hydrogen or heating in nitrogen or by immersing in sodium hypophosphite solution with certain substrates the Pd may be reactivated by immersion in palladium chloride. The substrate should have a black surface, and this may be achieved by coating with carbon which is subsequently burnt off with the photo-resist. A nickel plating solution contains (g./l.) NiSO 4 , 7H 2 O 29, NaH 2 PO 2 17, succinic acid 7A6 and NaOH to give pH of 4A9.

Addition reactions of hypophosphorous acid derivatives to unsaturated compounds

Abstract: 1. A study was made of the reactions of sodium hypophosphite and butyl hypophosphite with allyl alcohol, allyl acetate and allyl cyanide. 2. A method was developed for the preparation of the acid chlorides of theγ-acetoxypropyl- and γ-cyanopropylphosphonic acids, and also of the acid chloride of bis-(γ-acetoxypropyl)phosphinic acid.

Method for decreasing the flammability of cellulosic fabrics

Abstract: Cellulosic fabrics are rendered less flammable by reaction of acrylamidomethyl cellulose with sodium hypophosphite in the presence of ionizing radiation and then with bromine.