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US 5,512,416 AGranted
Optical recording medium
AssigneeTDK Corporation
InventorsKenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
Life of this patent
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Abstract
An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.
Claims4
An optical recording medium of the heat mode type comprising a substrate having deposited thereon a recording layer comprising at least one laser light absorbing dye and having a thickness in the range of from 0.03 to 2 .mu.m, said dye being represented by the general formula III:
- ##STR87## wherein Q and Q' each denote a condensed aromatic ring;
- R.sub.1 and R1' each denote a substituted or unsubstituted alkyl group having more than four carbon atoms, wherein the substituents are selected from the group consisting of alkylcarbonyloxy, hydroxy, carboxy and alkyloxycarbonyl;
- R.sub.2', R.sub.2', R.sub.3 and R.sub.3' each denote an alkyl group or an aryl group;
- L' denotes a methine chain for the formation of mono-, di-, tri- or tetracarbocyanine;
- X.sup.- denotes an anion;
- and m denotes 0 or 1.
3 more elements
Dependencies are inferred from the claim text.