Rubber composition and tire containing rubber composition

Abstract

Provided is a rubber composition including a rubber component. The rubber component contains at least a polymer that is a synthesized polyisoprene or an isoprene copolymer and that has 20% or less gel fraction.

1 . A rubber composition comprising a rubber component, wherein the rubber component contains at least a polymer that comprises a synthesized polyisoprene or an isoprene copolymer and that has 20% or less gel fraction. 
     
     
         2 . The rubber composition according to  claim 1 , wherein the rubber component contains the polymer by an amount in a range of 15 mass % to 100 mass % in total. 
     
     
         3 . The rubber composition according to  claim 1 , wherein the polymer contains a catalyst residue in an amount of 300 ppm or less. 
     
     
         4 . The rubber composition according to  claim 1 , wherein the polymer has a number average molecular weight (Mn) of 1.5 million or more when measured by gel permeation chromatography (GPC). 
     
     
         5 . The rubber composition according to  claim 1 , wherein the polymer contains nitrogen in an amount of less than 0.02 mass %. 
     
     
         6 . The rubber composition according to  claim 1 , further comprising a filler, wherein
 the amount of the filler contained in the rubber composition is in a range of 10 to 75 mass parts per 100 mass parts rubber component.   
     
     
         7 . A tire containing the rubber composition according to  claim 6 . 
     
     
         8 . A tire comprising a tread member containing the rubber composition according to  claim 6 .