Magnetic recording medium having a binder system including a polyurethane polymer having both phosphonate and quaternary ammonium pendant groups
US6139982A · kind A · utility
8Cited by
22References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31609
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a magnetic layer provided upon a major surface of a substrate, wherein the magnetic layer includes a magnetic pigment, and a polymeric binder system containing a polyurethane having (1) a plurality of pendant phosphonate ester groups effective for promoting wetting of the magnetic pigment by the polymeric binder system, and (2) at least one quaternary ammonium group effective for promoting wetting of the magnetic pigment by the polymeric binder system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.