Ribbon for non-impact printing of magnetic ink
US5041331A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Feb 24, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a ribbon for non-impact printing of documents of the type handled by magnetic reader/sorter apparatus comprising a polycarbonate substrate and a magnetic ink layer with a thin film of metal disposed between said substrate and said ink layer. The substrate consists essentially of a polycarbonate polymer containing from about 20 to about 40 percent by weight of an electrically conductive carbon black and the magnetic ink consists essentially of from about 60 to about 80 parts by weight of a solvent comprising at least member selected from the group consisting of aliphatic alcohols having from 1 to about 5 carbon atoms, and aromatic hydrocarbons having from about 6 to about 10 carbon atoms; about 10 to about 30 parts by weight of a polyamide polymer; from about 10 to about 30 parts by weight of a magnetic oxide; from about 1 to about 4 parts by weight of a plasticizer selected from the group consisting of azelate, phthalate, palmitate and adipate esters, from about 0 to about 10 parts by weight of carbon black and from about 0 to about 5 parts by weight of an alcohol soluble dye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.