Patent ID: 8501331

Claim:
A binder composition for a magnetic recording medium, which comprises a vinyl copolymer comprising a structural unit denoted by general formula [1], a structural unit denoted by general formula [2], and a structural unit denoted by general formula [3]: wherein, in general formula [1], R 1 denotes a hydrogen atom, a halogen atom, or a methyl group, L 1 denotes a single bond or a divalent linking group, and Y denotes a seven- to ten-membered alicyclic condensed ring; wherein, in general formula [2], R 2 denotes a hydrogen atom, a halogen atom, or a methyl group, L 2 denotes a single bond or a divalent linking group, and Z denotes a hydrocarbon group with a carbon number ranging from 8 to 50; wherein, in general formula [3], R 3 denotes a hydrogen atom, a halogen atom, or a methyl group, and L 3 denotes a single bond or a divalent linking group.