Magnetic recording medium
US6030689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Aug 21, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31609
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon at least two coating layers which comprise: PA1 a lower coating layer mainly comprising (1) at least one particles selected from nonmagnetic particles or soft magnetic particles and (2) a binder, formed on the support, and PA1 a magnetic layer comprising ferromagnetic particles dispersed in a binder, formed on the lower coating layer, PA1 wherein at least said lower coating layer contains a polyurethane resin having a cyclic structure and containing an ether group, and said nonmagnetic particles or soft magnetic particles contained in said lower coating layer have an average long axis length of from 0.04 to 0.20 .mu.m and an acicular ratio (long axis/short axis) of from 2 to 10. It is a high-output, low-noise magnetic recording medium having excellent magnetic-layer surface properties and satisfactory running durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.