METHOD FOR PRODUCING RUBBER WET MASTER BATCH

摘要

PROBLEM TO BE SOLVED: To provide a rubber wet master batch in which a filler is uniformly dispersed and which is a raw material of a vulcanized rubber having excellent heat generating properties and fatigue resistance, and to provide a method for producing the same, a rubber composition and a pneumatic tire.SOLUTION: There is provided a method for producing a rubber wet master batch which comprises: (I) a step of dispersing a filler in a dispersion solvent to produce a filler-containing slurry solution: (II) a step of stirring a filler-containing rubber latex solution obtained by adding a rubber latex solution to the filler-containing slurry solution while heating so as to be coagulated; and (III) a step of coagulating the filler-containing rubber latex solution by stirring while adding an acid, where in the step (II), the peripheral speed of a stirring blade provided in a mixing tank used during stirring is less than 10 m/s and the heat quantity per unit time and unit mass imparted to the filler-containing rubber latex solution by heating is 25 J or more and 250 J or less.