Highly oriented thermotropic magnetic recording medium
US4987020A · kind A · utility
9Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Oct 10, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Smooth, thin, dimensionally stable, essentially circular and planar injection-molded disc members, well adapted as substrates for magnetic recording discs, e.g., by providing same with an effective recording amount of a magnetic coating material on at least one of the face surfaces thereof, comprise a radially molecularly oriented thermotropic polymer, desirably having a flow temperature ranging from 200.degree. C. to 350.degree. C. and an inherent viscosity of at least 1 dl g.sup.-1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.