申请人:Takeda Chemical Industries, Ltd.
公开号:EP0311935A2
公开(公告)日:1989-04-19
The urethane resin having hydrophilic polar groups, mercapto groups, shows excellent dispersibility of magnetic powder, when used as a binder for magnetic recording media. And, magnetic recording media prepared by using the binder are excellent in surface-smoothness and durability. Besides, the mercapto groups contained in the magnetic layer reacts with isocyanate groups in the polyisocyanate to form thiourethane bonds to leave no hydrophilic polar groups i.e. mercapto groups, thus being excellent in moisture- and heat-resistance as well.
The resin and the binding agent are advantageously used in the production of magnetic recording media, for example, magnetic tape, magnetic disc, etc.
具有亲水性极性基团(巯基)的聚氨酯树脂用作磁记录介质的粘合剂时,磁粉的分散性极佳。使用这种粘合剂制备的磁性记录介质在表面光滑度和耐用性方面都非常出色。此外,磁性层中含有的巯基与聚异氰酸酯中的异氰酸酯基反应形成硫代氨基甲酸乙酯键,不留下亲水性极性基团(即巯基),因此具有优异的防潮和耐热性能。
这种树脂和结合剂可用于生产磁记录介质,如磁带、磁盘等。