申请人:NIPPON ZEON CO., LTD.
公开号:EP0435264A1
公开(公告)日:1991-07-03
According to this invention, there are provided a binder containing a polyurethane resin having an urethane bond and formed by the reaction of a diisocyanate and a polyol, said resin containing on the average at least 2.3 isocyanate groups in a molecule, having a number average molecular weight of at least 2,000 but at most 10,000 and containing less than 20 % of a component having a molecular weight of at most 1,000; a magneric recording layer or back coat layer using same; and a magnetic recording medium having same. Said magnetic recording medium is excellent in magnetic characteristics, durability and running property.
根据本发明,提供了一种含有聚氨酯树脂的粘结剂,该聚氨酯树脂具有聚氨酯键,由二异氰酸酯和多元醇反应形成,所述树脂分子中平均含有至少 2.3 个异氰酸酯基团,平均分子量至少为 2,000 但最多为 10,000,分子量最多为 1,000 的成分含量低于 20%;使用该粘结剂的磁记录层或背层;以及使用该粘结剂的磁记录介质。所述磁记录介质具有优异的磁性、耐用性和运行性能。