MAGNETIC RECORDING MEDIUM

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申请(专利)号： JP19920142011

专利号： JPH05314454A 主分类号： G11B5/66 申请权利人： FUJI PHOTO FILM

CO LTD 公开国代码： JP 优先权国家： JP

摘要：

PURPOSE:To obtain a magnetic recording medium having excellent travelling and durability by forming an undercoating layer mainly comprising non-magnetic fine particles having mean particle size and a bonding agent

between a non- magnetic supporter and a ferromagnetic metallic thin-film. CONSTITUTION:A magnetic layer composed of a ferromagnetic metallic thin-film 5 is formed onto a non-magnetic supporter 2. An undercoating layer using non- magnetic fine particles 4 having mean particle size of 100-350Angstrom as main bodies is shaped between the supporter 2 and the metallic thin-film 5. A polyester resin having a glass transition temperature (Tg) of 40 deg.C or lower is used as the bonding agent 3, and the film thickness of the undercoating layer is sea in 30-250Angstrom . Spherical silica fine particles, etc., are employed as the non-magnetic fine particles 4. Accordingly, adhesion with the magnetic layer is

improved by using the non-magnetic fine particles 4, thus increasing the breaking

申请日： 1992-05-08 公开公告日： 1993-11-26

分类号： G11B5/66

发明设计人： USUKI KAZUYUKI;

YASUNAGA TADASHI 申请国代码： JP

优先权： 19920508 JP

14201192

摘要附图：

strength of the magnetic layer and

preventing cracking, etc., then enhancing travelling durability. 主权项：

【請求項1】非磁性支持体上に強磁性金属薄膜よりなる磁性層を有する磁気記録媒体において、該非磁性支持体と該強磁性金属薄膜との間に平均粒径が100~350?である非磁性微粒子と結合剤を主体とする下塗り

权利要求说明书