BINDER FOR MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a binder for a medium having excellent dispersibility and durability.SOLUTION: A binder contains a polyurethane resin formed from a polyol component made by polymerization of a component of formula (1) where Mand Mare a hydroxy group or a residue obtained by excluding a specific number of active hydrogen from an active hydrogen-containing compound, Ris an ethylenically unsaturated bond-containing group, and L is a residue obtained by excluding all carboxyl groups from a specific acid.