Title:
【発明の名称】磁気記録媒体及びその製造方法
Document Type and Number:
Japanese Patent JP2666816
Kind Code:
B2
Abstract:
PURPOSE: To obtain a magnetic recording medium which is good in yield in spite of a coating type, exhibits the reproduced output of a high-frequency region equiv. to that of a vapor deposited tape and has good surface roughness, good electromagnetic conversion characteristics, such as C/N and excellent traveling durability. CONSTITUTION: This magnetic recording medium has at least two layers formed by providing the surface of a flexible base with a lower nonmagnetic layer contg. nonmagnetic powder and binder and providing the surface thereof with an upper magnetic layer contg. ferromagnetic powder and binder while the lower nonmagnetic layer is still wet. The average value (d) of the dry thickness of the upper magnetic layer is <=1μm and the ferromagnetic powder incorporated into this layer is acicular ferromagnetic powder. The nonmagnetic powder incorporated into the lower nonmagnetic layer is inorg. powder having Mohs' hardness of >=3. The average grain size thereof is 1/2 to 4 times the crystallized size of the acicular ferromagnetic powder included in the upper magnetic layer.
Inventors:
Hiroo Inaba
Kiyoshi Ejiri
Shinji Saito
Satoshi Hayakawa
Kiyoshi Ejiri
Shinji Saito
Satoshi Hayakawa
Application Number:
JP16021296A
Publication Date:
October 22, 1997
Filing Date:
June 20, 1996
Export Citation:
Assignee:
Fuji Photo Film Co., Ltd.
International Classes:
B05D5/12; B05D7/02; B05D7/24; C08J7/04; C09D5/23; C09D7/12; G11B5/708; G11B5/714; G11B5/73; G11B5/738; G11B5/842; (IPC1-7): G11B5/704; B05D5/12; B05D7/02; B05D7/24; C08J7/04; G11B5/708; G11B5/842
Domestic Patent References:
| JP4238111A | ||||
| JP4283416A | ||||
| JP4321924A | ||||
| JP4325915A | ||||
| JP4325917A | ||||
| JP512650A | ||||
| JP5197946A | ||||
| JP5182173A | ||||
| JP5182177A | ||||
| JP5182178A | ||||
| JP573883A | ||||
| JP63187419A | ||||
| JP63157313A | ||||
| JP1213829A |
Attorney, Agent or Firm:
Tadashi Hagino (3 outside)