Patent ID: 8110620
Filing Date: 2012-02-07
Classification: C08J,C08K,C08L

Abstract:
1. A process for producing an uncured rubber composition containing a rubber wet master batch obtained by using, as raw materials, at least a filler, a dispersing solvent, and a rubber latex liquid made mainly of a natural rubber latex, comprising: a step (I) wherein at the time of dispersing the filler into the dispersing solvent, at least one portion of the rubber latex liquid is added thereto, thereby preparing a slurry containing the filler to which rubber latex particles adhere, a step (II) wherein the slurry is mixed with the rest of the rubber latex liquid, thereby preparing the rubber latex liquid containing the rubber-latex-particle-adhering filler, a step (III-a) wherein the rubber latex liquid containing the rubber-latex-particle-adhering filler is solidified and dried, thereby producing a rubber wet master batch, and a step (IV) wherein the rubber wet master batch is dry-mixed with a dry rubber made mainly of a natural rubber and/or a polyisoprene rubber.