Polymer, method of producing polymer, and rubber composition
A polymer includes a repeating unit represented by Formula (1) and/or a repeating unit represented by Formula (2), and a repeating unit represented by Formula (3) and/or a repeating unit represented by Formula (4), where a proportion of a total of the repeating unit represented by Formula (1) and the repeating unit represented by Formula (2) is greater than 0 mol % but ≤100 mol %; a proportion of a total of the repeating unit represented by Formula (3) and the repeating unit represented by Formula (4) is ≥0 mol % but less than 100 mol %; a proportion of a total of the repeating unit represented by Formula (1) and the repeating unit represented by Formula (3) is ≥20 mol %; and a proportion of a total of the repeating unit represented by Formula (2) and the repeating unit represented by Formula (4) is ≤80 mol %.
1. A rubber composition comprising a rubber component containing a polymer and carbon black and/or silica,
the polymer comprising a repeating unit represented by Formula (1), a repeating unit represented by Formula (2), a repeating unit represented by Formula (3) and a repeating unit represented by Formula (4), wherein
among all the repeating units, the proportion of a total of the repeating unit represented by Formula (1) is 5 mol % or greater;
among all the repeating units, the proportion of the repeating unit represented by Formula (3) is 20 mol % or greater; and
among all the repeating units, the proportion of the repeating unit represented by Formula (2) and the repeating unit represented by Formula (4) is from 1 to 80 mol %:
where in Formula (1) and Formula (2), for R 1 or R 2 , one represents an aromatic hydrocarbon group that may have at least one substituent, and the other represents a hydrogen atom, and
in Formula (1) to Formula (4), R X and R Y each represent a hydrogen atom, an alkyl group, or a halogen atom while at least one of R X and R y represents a hydrogen atom.
2. The rubber composition according to claim 1 , wherein a content of the silica is 10 parts by mass or greater per 100 parts by mass of the rubber component.