High capacity recording media
US5871882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1997 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Jul 9, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium comprising a substrate, a reflecting layer and a recording layer, which recording layer consists essentially of one or more than one dye of formula (I) or chlorination or bromation products thereof ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 -C.sub.8 alkyl or C.sub.2 -C.sub.8 alkenyl; PA1 R.sub.3, R.sub.6, R.sub.9 and R.sub.12 are hydrogen, halogen, CN, CHO, C.sub.1 -C.sub.8 alkyl or unsubstituted or substituted C.sub.6 -C.sub.14 aryl; PA1 R.sub.4, R.sub.5, R.sub.7, R.sub.8, R.sub.10 and R.sub.11 are hydrogen, halogen, NO.sub.2, CHO, COOR.sub.13, CONR.sub.14 R.sub.15, CN or unsubstituted or substituted C.sub.1 -C.sub.8 alkyl or C.sub.2 -C.sub.8 alkenyl; PA1 or R.sub.4 and R.sub.5, R.sub.7 and R.sub.8 and/or R.sub.10 and R.sub.11 together are an unsubstituted or substituted 1,4-buta-1,3-dienylene, 2-buten-1,4-diylidene, 1,3-propylene or 1,4-butylene bridge, so as to form, optionally together with the shared C--C or C.dbd.C group, a five- or six-membered ring; PA1 and M is H.sub.2 or a divalent metal atom, oxometal, halogenometal or hydroxymetal which may be coordinated to one or two neutral ligands. The recording media…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.