C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3057, 400/64
C08L 9/00 (2006.01) C08J 3/14 (2006.01) C08J 3/215 (2006.01) C08L 23/18 (2006.01)
Patent
CA 1057878
ABSTRACT A process for the manufacture of a free-flowing, pulverulent rubber- filler mixture by emulsifying a highly viscous rubber solution in water con- taining an emulsifier, mixing the aqueous emulsion with an aqueous dispersion of a solid filler to give a stable mixture which can be stored, intorducing the stable mixture into said water whereby the rubber-filler mixture is precipitated, the pH value being from 0.1 to 7 during the whole precipitation process, separating the precipitated, finely divided rubber-filler mixture from water while simultaneously distilling off the rubber solvent, and dry- ing the rubber-filler mixture. An ionic, high molecular weight, water-sol- uble colloid is added to the water containing an emulsifier before, during or after mixing with the highly viscous rubber solution and the pH value of the mixture thus obtained is adjusted to 7 to 14. The process of this in- vention gives a product having better stability and storage properties than known processed is which the polymerization is followed by a dilution stage.
203309
Berg Gerhard
Nordsiek Karl-Heinz
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