Ferromagnetic organic substance having triaryl methane structure and process for manufacturing the same
US4954607A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Aug 15, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ferromagnetic organic substance having a triaryl methane structure and a free radical concentration of methine carbon positions of at least 10.sup.17 radicals/g, preferably at least 10.sup.18 radials/g, is provided by polycondensing a condensed polynuclear aromatic compound or an electron donating group substituted monocyclic aromatic compound with an aromatic aldehyde in the presence of an acid catalyst, to produce a precondensate having a softening point between 30.degree. C. and 120.degree. C. and being soluble in various organic solvents, and subjecting the resulting precondensate to a dehydrogenation treatment and a purification treatment, followed by molding. Alternatively, a preferable ferromagnetic organic substance having a triaryl methane structure is also manufactured by self-polycondensing an aromatic derivative having at least one electron donating group and at least one aldehyde group in the presence of an acid catalyst and then dehydrogenating the resulting polymer by light-irradiation and/or treatment with an oxidizing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.