Patent ID: 9447255
Filing Date: 2016-09-20
CPC Classification: C08K,C08L

Claim Text:
1. A method for producing a rubber composition containing a rubber component (A) that contains a modified conjugated diene-based polymer obtained by using a modifying agent that has a functional group compatible with silica, a filler containing an inorganic filler (B), a silane coupling agent (C), and at least one promoter (D) selected from guanidines, sulfenamides, thiazoles, thiurams, thioureas, dithiocarbamic acid compounds and xanthogenic acid compounds, wherein the rubber composition is kneaded in plural stages, and in the first stage (X) of kneading, the rubber component (A), all or a part of the inorganic filler (B), all or a part of the silane coupling agent (C) and the promoter (D) are added, wherein the molar amount of the promoter (D) is front 0.1 to 1.0 times the molar amount of the silane coupling agent (C), and kneaded, and in the final stage of kneading, a vulcanizing agent and a vulcanization accelerator are added and kneaded.