MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To obtain a magnetic recording medium having extremely superior traveling performance and durability and causing hardly the wear of a guide member, etc. by forming a back coat layer consisting of a binder contg. polyurethane resin or polyester resin having hydrophilic polar groups, carbon black and a pigment meeting a prescribed standard. CONSTITUTION:A back coat layer consists of a binder contg. >=80wt% polyurethane resin or polyester resin having hydrophilic polar groups and nonmagnetic pigments. Carbon black and a pigment having >=5 Mohs' hardness are used as the nonmagnetic pigments in 95:5-60:40 weight ratio. The constituent materials are dissoveled or dispersed in an org. solvent and kneaded by means of a ball mill or the like to prepare a coating material for a back coat. This coating material is coated on one side of a nonmagnetic support to form a back coat layer. A magnetic layer is formed on the other side.