High density information record medium comprising a polymer material having a lubricant uniformly dispersed therein
US4906499A · kind A · utility
0Cited by
9References
2Claims
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Key dates
| Filing date | Jul 5, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jul 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/068
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information signal record medium of an electrostatic capacitance type in which a signal information is recorded as geometric variations is described. The medium is made of a conductive resin composition which comprises a vinyl chloride resin and 5 to 30 parts by weight of conductive particles based on 100 parts by weight of the vinyl chloride resin. The vinyl chloride resin is obtained by polymerizing at least one monomer for the vinyl chloride resin in which from 0.2 to 1 parts by weight of a lubricant per 100 parts by weight of the vinyl chloride resin is dissolved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.