| abstract |
[PROBLEMS] To provide a rubber reforming material using cellulose fiber, which exhibits good dispersibility in a dispersion, has a high elastic modulus, and has a low exothermic property. To do. A rubber modifier containing cellulose fibers, wherein the cellulose constituting the cellulose fibers is cellulose having a group derived from phosphoric acid and / or a group derived from carboxylic acid, and the rubber A rubber latex dispersion containing a modifier and rubber latex, a rubber composition containing the rubber modifier and rubber, and a rubber composition produced using the rubber latex dispersion. [Selection figure] None |