C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
400/9065, 400/91
C03C 1/00 (2006.01) C08J 3/14 (2006.01) C08J 3/215 (2006.01) C08K 3/34 (2006.01)
Patent
CA 1057881
ABSTRACT A process for the manufacture of a pulverulent, non-tacky, free- flowing filled rubber base mixture which comprises mixing a rubber latex or an aqueous stable emulsion of a rubber solution with less than the envisaged total amount of solid filler in the form of an aqueous dispersion or suspen- sion thereof to give a stable, homogeneous mixture; feeding the stable, homogeneous mixture to a multi-stage precipitation pro- cess by (1) mixing the stable, homogeneous mixture into water containing a precipi- tant and a sodium silicate whereupon the rubber and filler conjointly pre- cipitate as a rubber premix, and distilling off rubber solvent which may be present, (ii) adjusting the aqueous suspension of the rubber premix, thus obtained to a pH value of 4.0 to 9.0 for the precipitation of dissolved silica in the presence of a silica precipitant and (iii) mixing the suspension, thus obtained, of rubber premix and precipi- tated silica with the remainder of the envisaged total amount of solid filler in the form of an aqueous suspension; separating the precipitated material plus filler together constituting the filled rubber base mixture from the water; and drying the rubber base mixture with constant agitation. The rub- ber base mixtures of this invention find many uses, in particular the manu- facture of extended products.
233548
Berg Gerhard
Nordsiek Karl-Heinz
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