发明授权
US5094916A Magnetic recording medium comprising a polyurethane binder resin having
a specified glass transition, molecular weight, and polar group content
失效
包含具有指定玻璃转换，分子量和极性组含量的聚氨酯粘合剂树脂的磁记录介质
- 专利标题： Magnetic recording medium comprising a polyurethane binder resin having a specified glass transition, molecular weight, and polar group content
- 专利标题（中）： 包含具有指定玻璃转换，分子量和极性组含量的聚氨酯粘合剂树脂的磁记录介质
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申请号： US629464申请日： 1990-12-18
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公开(公告)号： US5094916A公开(公告)日： 1992-03-10
- 发明人: Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
- 申请人： Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
- 申请人地址： JPX Tokyo
- 专利权人： Konica Corporation
- 当前专利权人： Konica Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX1-339749 19891228
- 主分类号： C08G18/08
- IPC分类号： C08G18/08 ; C09D5/23 ; C09D175/00 ; C09D175/04 ; G11B5/702
摘要：
A magnetic recording medium is disclosed which has a magnetic layer comprising a ferromagnetic powder and a specific polyurethane resin as a binder. The polyurethane resin has a weight average molecular weight of not more than 30,000, a glass transition point of not higher than 0.degree. C. and a -SO.sub.3 M group, wherein M is a hydrogen atom or an alkali metal atom, in an amount of not less than 0.35% by weight in terms of sulfur atom. The recording medium is excellent in the dispersibility of the magnetic powder in the binder and has high running stability.
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