Method for producing rubber wet masterbatch and method for producing rubber composition

A method for producing a rubber wet masterbatch which is yielded using at least carbon black, a dispersing solvent, and a rubber latex solution as raw materials,

• the method comprising:
• a step (I) of producing a carbon black-containing rubber latex solution by mixing the carbon black, the dispersing solvent, and the rubber latex solution;
• a step (II) of producing a carbon black-containing rubber coagulated product by coagulating the resultant carbon black-containing rubber latex solution;
• and
• a step (III) of producing a rubber wet masterbatch by dehydrating and drying the resultant carbon black-containing rubber coagulated product,
• wherein the carbon black satisfies conditions in which:
• a dibutyl phthalate oil absorption is 105 mL/100 g or more and 230 mL/100 g or less;
• a statistical thickness specific surface area is 90 m2/g or more and 205 m2/g or less;
• and
• a value obtained by subtracting a value of the statistical thickness specific surface area from a value of the dibutyl phthalate oil absorption is 25 or more.