Magnetic recording medium comprising a polyurethane binder resin having a specified glass transition, molecular weight, and polar group content
US5094916A · kind A · utility
8Cited by
1References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 18, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Dec 18, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31609
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.