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Magnetic recording medium comprising a polyurethane binder resin having a specified glass transition, molecular weight, and polar group content
Magnetic recording medium comprising a polyurethane binder resin having a specified glass transition, molecular weight, and polar group content
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机译:包含具有特定玻璃化转变温度,分子量和极性基团含量的聚氨酯粘合剂树脂的磁记录介质
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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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