Hoechst Aktiengesellschaft

Erich Schallus

Gerhard Mietens

Franz-Josef Dany

Wilhelm Vogt

Hubert Neumaier

Gregor Fucker

Jurgen Petrell

Gunter Peantek

Friedrich Wilhelm Dorn

Antistatic properties are imparted to plastics by blending a pulverulent plastics material and, if desired further addends, with conductive carbon black and making the resulting blend into a moulding composition. The plastics are more particularly blended with 4 to 12 weight % of conductive carbon black having a water absorption stiffness (AS-number) of 15 to 35, a specific electric resistance of 10.sup.-1 up to 10.sup.-3 ohms . cm under a moulding pressure of 100 to 180 atmospheres absolute, a bulk density of 100 to 180 g/liter, a BET-surface area of 100 to 1000 m.sup.2 /g. The carbon black is made by a process wherein an aqueous suspension of carbon black having an AS-number higher than 15 is intimately blended at temperatures within the range 5.degree. and 120.degree. C, under pressure within the range 1 and 20 atmospheres absolute, in liquid phase at a pH-value of 7 to 10, and for a period of 1 to 20 minutes, with vaporizable liquid aliphatic or cycloaliphatic hydrocarbons, the carbon black is separated from liquid matter, then heated and thereby freed from hydrocarbons and water, and finally annealed for 20 to 30 minutes at 200.degree. up to 2200.degree. C. The aqueous suspension is prepared by subjecting hydrocarbons, which are liquid at room temperature, to thermal conversion at 1200.degree. to 2000.degree. C, under pressures within the range 1 and 80 atmospheres absolute, and in the presence of oxygen or an oxygen-containing gas, and water scrubbing the resulting carbon black-containing reaction gas.

Process for imparting antistatic properties to plastics

Conductive carbon black for use in depolarization masses in dry batteries is produced. To this end, an aqueous suspension of carbon black having an AS-number higher than 15 and having been obtained by subjecting hydrocarbons, which are liquid at room temperature, to thermal conversion at 1200.degree.-2000.degree. C, under 1-80 atmospheres, and in the presence of oxygen or oxygen-containing gas and, if desired, steam, and water-scrubbing the resulting carbon black-containing reaction gas, is intimately mixed at 5.degree.-120.degree. C, under 1-20 atmospheres, in liquid phase and for 1-20 minutes with 0.5-10 g, per gram of carbon black, of vaporizable aliphatic or cycloaliphatic hydrocarbons, the resulting carbon black is separated from the liquid phase, heated and thereby freed from hydrocarbons and water, and the temperature is finally increased for 2-30 minutes to 1100.degree.-2200.degree. C.

Process of conductive carbon black for use in depolarization masses in

Production of alkali metal salts of amino polycarboxylic acids by reaction of a suitable carboxylic acid nitrile with aqueous alkali at elevated temperature. The salts are produced from an amino polycarboxylic acid nitrile suspension in an aqueous alkali metal hydroxide solution, which has a minimum strength of substantially 30 % by weight and contains at least stoichiometric proportions of alkali metal hydroxide; the suspension is introduced into a reactor heated to a temperature between 60.degree. and 150.degree. C, and salt formation is effected by thorough agitation.

Process for the manufacture of alkali metal salts of amino

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Erich Schallus