| abstract |
A roller is essentially consisting of a resin composition that contains, as a base resin, a copolymer essentially consisting of a repeating unit expressed by a formula (i): n n n n n n n n n n where “a” denotes a number from 4 to 9, a repeating unit expressed by a formula (ii): n n n n n n n n n n and a repeating unit expressed by a formula (iii): n n n n n n n n n n where “b” denotes a number from 9 to 11, the roller being formed in an annular shape. In a roller device, the roller is arranged to cover an outer periphery of an outer ring of a rolling bearing that includes an inner ring, the outer ring, and rolling elements. |