Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1997-06-23
1999-08-17
Evans, Elizabeth
Stock material or miscellaneous articles
Circular sheet or circular blank
428 642, 428 644, 428 648, 428913, 43027014, 43027016, 4304951, 430945, 369283, 369288, B32B 300
Patent
active
059391634
ABSTRACT:
An optical information recording medium which records at shorter laser wavelengths and has excellent light resistance and archival stability includes a supporting substrate and a recording layer coated on the substrate. The recording layer includes a metal chelated azo compound, the azo compound having the general formula (I): ##STR1## wherein X is NR.sup.6 group, oxygen or sulphur, wherein R.sup.6 is hydrogen or alkyl; Y is hydroxy, carboxy, or carbamoyl; each of R.sup.1 -R.sup.5 is independently hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted alkenyl, alkoxy, amino, halogen, nitro, cyano, trifluoromethyl, or carboxy, with the proviso that all of R.sup.1 -R.sup.5 are not simultaneously hydrogen; and the metal is a metal ion of Groups 3-12 of the Periodic Table.
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Hgashi Yasuhiro
Sasa Noboru
Satou Tsutomu
Tomura Tatsuya
Ueno Yasunobu
Evans Elizabeth
Ricoh Co. Ltd.
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