MAGNETIC RECORDING MEDIUM,申请号JP19820021586-传众专利搜索

MAGNETIC RECORDING MEDIUM

申请公布号：JPS58139337(A)

申请号：JP19820021586

申请日期：1982.02.13

申请公布日期：1983.08.18

申请人：

HITACHI MAXELL KK

发明人：ZAITSU HIROSHI;KARASHIMA KAZUTO;TOGAWA FUMIO;AOYAMA SHIGEO

分类号：C09D5/23;C09D7/12;G11B5/716;G11B5/845

主分类号：C09D5/23

摘要：PURPOSE:To enable high density recording by laminating a magnetic layer contg. magnetic iron oxide powder and oriented in the horizontal direction and a magnetic layer contg. magnetic needlelike metallic powder and oriented in the vertical direction. CONSTITUTION:A magnetic coating consisting essentially of magnetic iron oxide powder of gamma-Fe2O3, gamma-Fe2O3 contg. Co or the like, a binder resin and a solvent is applied to a substrate such as a polyester film and dried after carrying out orientation in a magnetic field so as to provide >=0.7 squareness in the horizontal direction of the resulting magnetic layer. A magnetic coating consisting essentially of magnetic needlelike metallic powder of Fe, Co or the like, a binder resin and a solvent is then applied to the magnetic layer and dried while carrying out orientation in the vertical direction in a vertical magnetic field so as to provide >=0.4 squareness.