Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1986-05-05
1988-04-12
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430495, 430945, G03C 172, G01D 900, G01D 1510, G11B 724
Patent
active
047374438
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an optical recording medium having an indophenol-group dye as an information recording layer.
More particularly, the present invention relates to an optical recording medium for performing recording by the use of the changes in state of material owing to the optical energy of oscillatory wavelength of a semiconductor laser.
PRIOR ART
Various optical recording media have been already known as the media of the kind described above.
For example, a medium having a layer of phthalocyanine-group dye on the substrate thereof has been disclosed in Japanese Patent Application (OPI) No. 97033/80 (the term "OPI" as used herein means an "unexamined published application"). The phthalocyanine-group dye has disadvantages of low sensitivity, insufficient deposition because of its high decomposing point, or the like. Further, a disadvantage is that the dye cannot be used for coating by application, because its solubility in organic solvent is very low.
A medium having a recording layer of phenalene-group dye, and a medium having a recording layer of naphthoquinone-group dye have been disclosed in Japanese Patent Application (OPI) Nos. 83344/83 and 224793/83, respectively. Such dyes have an advantage of easily depositing but reversely have a disadvantage of a low reflectivity. Because of the low reflectivity, the contrast relating to the reflectivity between a portion recorded by a laser beam and a non-recording portions becomes low, thereby making it difficult to reproduce recorded information. In addition, organic dyes generally have a disadvantage of low preservative stability.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an optical recording medium using a dye being capable of depositing easily, being high soluble in organic solvent, being capable of coating by an application, having a high reflectivity, and being superior in contrast as well as in preservative stability.
The gist of the present invention exists in an optical recording medium in which recording and/or reproducing is made by the state changes of material owing to a laser beam, comprising an indophenol-group dye supported on a substrate.
BEST MODE FOR CARRYING OUT THE INVENTION
Various dyes can be used as the indophenol-group dye used in the optical recording medium of the present invention, and the example thereof is represented by general formula [I] ##STR1## --K represents a substituted or unsubstituted aromatic amine residue, and --R represents a hydrogen atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aminocarbonyl group, a substituted or unsubstituted carbonylamino group, a substituted or unsubstituted aminosulfonyl group, a substituted or unsubstituted sulfonylamino group, or a substituted or unsubstituted thiocarbonylamino group.
In the general formula [I] described above, examples of the substituent on the alkyl group, alkoxy group, aminocarbonyl group, carbonylamino group, aminosulfonyl group, sulfonylamino group or thiocarbonylamino group include: an aryl group, such as a phenyl group, a naphthyl group or the like, possible to be substituted by a thiocyanato group, a nitro group, a halogen atom, a cyano group, an alkyl group, an alkylsulfonyl group, a hydroxyalkylsulfonyl group, an alkoxysulfonyl group, an alkoxyalkoxysulfonyl group, an allylsulfonyl group, an alkoxycarbonyl group, an alkoxyalkoxycarbonyl group, an alkoxyalkoxyalkoxycarbonyl group, an alkoxy group, an alkoxyalkoxy group, an alkoxyalkoxyalkoxy group, etc.; an alkyl group; an aralkyl group, such as a benzyl group or the like; a tetrahydrofurfuryl group; a cycloalkyl group, such as a cyclohexyl group or the like; an amino group, such as a phenylamino group, an alkylamino group, a dialkylamino group or the like; and a substituted or unsubstituted, penta- or hexa-heterocyclic residue having a nitrogen atom, an oxygen atom, or a sulfur atom, such as a nitrothiazoly
REFERENCES:
patent: 4235957 (1980-11-01), Kohrt et al.
patent: 4412231 (1983-10-01), Namba et al.
patent: 4619990 (1986-10-01), Elmasry
Hackh's Chemical Dictionary, 3rd edition, edited by Julius Grant; McGraw-Hill Book Co. Inc. p. 439.
Kurose Yutaka
Maeda Shuichi
Murata Yukichi
Niwa Toshio
Ozawa Tetsuo
Buscher Mark R.
Michl Paul R.
Mitsubishi Chemical Industries Limited
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