High density information records made of conductive resin compositions comprising a specifically-treated vinyl chloride-base resin
US4548739A · kind A · utility
2Cited by
4References
9Claims
0Family size
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Key dates
| Filing date | Apr 17, 1984 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Apr 17, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/068
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high density information record of the electrostatic capacitance type comprising a record substrate on which signal information is recorded as geometric variations. The record substrate is made of a conductive resin composition comprising a vinyl chloride resin and a conductive powder. The vinyl chloride resin is obtained by suspension polymerization of starting vinyl chloride monomer in an aqueous solution of a water-soluble polymer suspension stabilizer from which insoluble organic matters with sizes over 10 .mu.m have been removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.