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Infrared-absorptive compound containing optical recording medium
| Details |
Inventors: Mihara, Chieko; Sugata, Hiroyuki; Santoh, Tsuyoshi; Fukui, Tetsuro;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Bowers, Jr.; Charles L.
Assistant Examiner: Angebranndt; Martin
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
An infrared-absorptive compound represented by the following Formula (I) or (II). ##STR1## to be contained with an organic coloring matter in the recording layer for providing durable optical recording mediums. |
|
DETAILED DESCRIPTION An object of the present invention is to provide a novel infrared-absorptive compound having a wide absorption range in the infrared region, also having a high absorbance coefficient, and having good solubility.
Another object of the present invention is to provide an optical recording medium remarkably improved in durability in repeated reproduction and light-resisting stability.
The infrared-absorptive compound of the present invention is represented by the following Formula (I) or (II).
##STR2## wherein R.
sub.
1, R.
sub.
2, R.
sub.
3, R.
sub.
4, R.
sub.
5, R.
sub.
6, R.
sub.
7 and R.
sub.
8 may independently represent a hydrogen atom or a monovalent organic residual group; R.
sub.
1 and R.
sub.
2 R.
sub.
3 and R.
sub.
4, R.
sub.
5 and R.
sub.
6, and R.
sub.
7 and R.
sub.
8 may together form a 5-membered, 6-membered or 7-membered ring; R.
sub.
9, R.
sub.
10, R.
sub.
11 and R.
sub.
12 may independently represent a hydrogen atom, an alkyl group, an alkoxyl group, a halogen atom, a hydroxyl group or a cyano group; X represents a sulfur atom, an oxygen atom, a selenium atom, a tellurium atom or NR.
sub.
13 wherein N represents a nitrogen atom and R.
sub.
13 represents a hydrogen atom or a monovalent organic group; and Y.
sup.
- represents an anion.
The optical recording medium of the present invention comprises a recording layer at least containing an organic coloring matter and an infrared-absorptive compound described above.
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