Bridgestone Corporation

Asahi Carbon

Fumiteru Nishiura

Atsushi Nakayama

Takeshi Kasai

Kazuaki Someno

Masaaki Izuchi

Yukari Kanda

Kenji Hara

Takashi Yagi

Provided is a process for producing a wet masterbatch which, without deteriorating a reinforcing property of a rubber composition and rubber physical properties, micronizes a filler slurry by controlling an amount of functional groups on a filler surface, and improves filler dispersibility in the rubber wet masterbatch and the rubber composition. The process for producing a wet masterbatch comprises: a step of producing a slurry solution having a pH of 8 or more by dispersing carbon black having an average amount of surface acidic functional groups (&#x3bc;eq/m) of 0.15 or more and less than 3.00; a step of producing a mixture by mixing the slurry solution and a rubber latex solution in a liquid phase; and a step of drying the mixture.

Process for producing wet masterbatch, and wet masterbatch produced by said process

Provided are a process for efficiently producing a rubber wet master batch in which a dispersibility of carbon black in the rubber is improved, in which a reinforcing property and an abrasion resistance of the rubber can be enhanced by using carbon black having a high surface activity, in which a yield of the carbon black in the wet master batch obtained is not reduced and in which a handling property of the carbon black is good as compared with master batches prepared by using a granulated and dried substance of carbon black prepared by a conventional wet method and non-granulated carbon black, a carbon black-containing rubber wet master batch obtained by the above process and a rubber composition and a tire prepared by using the master batch. It is a process for producing a rubber wet master batch comprising a step for mixing a slurry (A) in which a filler containing carbon black is dispersed with a rubber liquid (B) in which a rubber component is dispersed or dissolved, wherein the slurry (A) is prepared by using a filler containing a carbon black granulated substance which is granulated by a wet method and which stays in a non-drying state.

Process for producing rubber wet master batch, rubber composition and tire

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Tokyo, Japan

Fumiteru Nishiura