Optical information recording medium
AssigneeCanon Kabushiki Kaisha
InventorsTeijiro Kitao, Hironori Oda
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Abstract
An optical information recording medium improved in storage stability and thermal stability, having a base and a recording layer, the recording layer containing a spiropyran compound and at least one carboxylic acid metallic complex expressed by general formulae I! and II!: ##STR1## where M represents a metallic element and each of R.sub.11 and R.sub.12 represents an alkylene group, an alkylidene group, an aromatic ring, an aliphatic ring, or a heterocyclic ring.
Claims6
An optical information recording medium comprising a base and a recording layer, the recording layer containing a spiropyran compound expressed by the following formula:
- ##STR29## where X is substituted or unsubstituted C;
- Y is O;
- Z is N;
- each of the rings A and B is an aromatic ring which may be substituted;
- and each of R.sub.1 and R.sub.2 is a hydrogen atom, a halogen atom or a univalent organic residue, and a carboxylic acid metallic complex expressed by the following formula:
- ##STR30## and a cellulose ester.
Dependencies are inferred from the claim text.