Process for imparting antistatic properties to rubber

Details Process for imparting antistatic properties to rubber Process for imparting antistatic properties to rubber

C - Chemistry, Metallurgy

09

K

31/158

C09K 3/16 (2006.01) C08C 4/00 (2006.01) C08K 3/04 (2006.01) C09C 1/50 (2006.01)

Patent

CA 1079517

ABSTRACT OF THE DISCLOSURE Antistatic properties are imparted to rubber by admixing it with conductive carbon black, vulcanizing the resulting blend and forming the rubber. More spe- cifically, the rubber is admixed with about 5 to 40 weight % of conductive carbon black which has an AS- number of 15 to 35, a specific electric resistance of 10-1 up to 10-3 ohms x 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 m2/g. the carbon black is made by a process wherein an aqueous suspension of carbon black with an AS-number higher than 15 and prepared by subjecting hydrocarbons, which are liquid at room temperature, to thermal con- version at 1200 to 2000°C. under pressures within the range 1 and 80 atmospheres absolute, and in the presence of oxygen or an oxygen-containing gas, and water scrubb- ing the resulting carbon-black-containing reaction gas, is intimately blended at 5 to 120°C. under pressures of 1 to 20 atmospheres absolute, in liquid phase at a pH-value of 7 to 10, and for 1 to 20 minutes, with va- porizable liquid aliphatic or cycloaliphatic hydrocar- bons, 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°C up to 2200°C.

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