Optical information recording medium using bisazo or trisazo compounds
US5441844A · kind A · utility
4Cited by
1References
4Claims
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Inventor
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2535
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Bisazo compounds of formula (I), an intermediate for producing the bisazo compound of formula (I), and trisazo compounds of formula (II) for use in optical information recording media, and methods of producing these compounds are disclosed: ##STR1## wherein R represents hydrogen, an alkyl group having 1 to 20 carbon atoms; an aryl group selected from the group consisting of phenyl group, naphthyl group, mesityl group, and tri-t-butyl phenyl group; an alkoxyl group having 1 to 4 carbon atoms; a nitro group; a cyano group; chlorine; or bromine; n is an integer of 1, 2, or 3, and C.sub.p represents a coupler residue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.