发明名称 |
Magnetic recording medium |
摘要 |
Provided is a magnetic recording medium having excellent coating film smoothness, electromagnetic characteristics and running durability. A magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and at least one magnetic layer comprising a magnetic material and a binder in this order. The magnetic material is an acicular ferromagnetic material having a major axis length ranging from 20 to 100 nm, the nonmagnetic layer and at least a magnetic layer adjacent to the nonmagnetic layer are obtained by simultaneously multilayer coating a nonmagnetic layer coating liquid and a magnetic layer coating liquid and exposing to radiation. The binder comprised in the nonmagnetic layer coating liquid comprises a vinyl chloride copolymer having a molecular weight ranging from 10,000 to 100,000 and a radiation-curing functional group. The magnetic layer coating liquid does not comprise a binder component having a radiation-curing functional group. The nonmagnetic layer coating liquid and/or said magnetic layer coating liquid comprise a compound having a molecular weight ranging from 200 to 2000 and a radiation-curing functional group with two or more functions. The magnetic layer adjacent to the nonmagnetic layer has a thickness equal to or less than 0.5 mum.
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申请公布号 |
US6759119(B2) |
申请公布日期 |
2004.07.06 |
申请号 |
US20020151176 |
申请日期 |
2002.05.21 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
MURAYAMA YUICHIRO;HASHIMOTO HIROSHI |
分类号 |
G11B5/702;G11B5/714;G11B5/738;(IPC1-7):G11B5/738 |
主分类号 |
G11B5/702 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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