Bleaching and dyeing; fluid treatment and chemical modification – Dye or potential dye composition – additive – treatment,... – Mixed dyes – noncomplexed
Patent
1992-01-24
1994-07-19
Higel, Floyd D.
Bleaching and dyeing; fluid treatment and chemical modification
Dye or potential dye composition, additive, treatment,...
Mixed dyes, noncomplexed
8638, 106622R, 106 23R, 106 23H, 106 23L, 106493, 106494, 106496, 534573, 534693, 534728, 534703, 534707, 534710, 534711, 548468, C09B 1100, C09B 1102, C09B 5704, C09B 6722, C09B 6742
Patent
active
053305426
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dye-incorporated composition comprising a cyanine type dye and an azo metal chelate compound, and an optical recording medium using it, more particularly, to a dye-incorporated composition which shows an absorption within the range of from 600 to 800 nm and has excellent light fastness and moisture resistance, useful for various optical recording media, electro-photosensitive materials, color liquid crystal display materials, light beam cut filters or the like, and an optical recording medium using it.
BACKGROUND ART
An optical recording medium employing laser makes storage and reproduction of high density information records possible, and its development have been remarkable recent years.
As an example of the optical recording medium, an optical disc may be mentioned. In general, an optical disc is usually designed to irradiate a focused laser beam of about 1 .mu.m, to a thin recording layer formed on a substrate of disc shape to conduct high density information recording. The recording is carried out in such a manner that upon absorption of the layer beam energy, the irradiated portion of the recording layer will undergo a thermal deformation such as decomposition, evaporation or melting. Reproduction of the recorded information is carried out by reading the difference in the reflectance between the portion having a deformation formed by the laser beam and the portion having no such deformation.
Accordingly, an optical recording medium is required to efficiently absorb the energy of the laser beam, and also required to have a predetermined amount of absorbed light to a laser beam having a specific wavelength employed for recording and to be high in the reflectance to a laser beam having a specific wavelength employed for reproduction for accurately conducting the reproduction of information.
As the optical recording medium of this kind, there have been proposed ones comprising an organic dye thin film formed on a substrate. Since it is possible to form the organic dye thin film by coating, its mass productivity is high and the cost is expected to be low.
It has been known that a thin film containing the cyanine type dye is employed as the organic dye thin film (reference can be made with Japanese Unexamined Patent Publications No. 112790/1983, No. 114989/1983, No. 85791/1984 and No. 83236/1985). However, the optical recording medium comprising such a cyanine type dye is poor in the light stability, and has a problem in the storage stability and a drawback such that it is prone to light deteriorating upon reproduction. Thus, Japanese Unexamined Patent Publications No. 55795/1984, NO. 40389/1989, No. 55189/1990, No. 68742/1990, etc. propose to add various metal chelate compounds represented by the following structural formula (1), (2), (3) or (4), to the cyanine type dye to improve the light stability. However, the improvement is still on an insufficient level. ##STR2##
DISCLOSURE OF THE INVENTION
The present invention relates to a dye-incorporated composition which comprises a cyanine type dye and a metal chelate compound comprising an azo type compound of the following formula (I): ##STR3## (wherein A is a residue forming a hetero ring together with the carbon atom and the nitrogen atom to which it is bonded, B is a residue forming an aromatic ring or a hetero ring together with the two carbon atoms to which it is bonded, and X is a group having an active hydrogen), and a metal, and an optical recording medium using it.
Namely, an object of the-present invention is to provide a dye-incorporated composition containing a cyanine type dye and an azo metal chelate compound, which is excellent in the light fastness and moisture resistance as a dye for various chemical information materials such as optical recording media, and suitable to spin coating, and to provide an optical recording medium, which has the composition in its recording layer, being excellent in the light stability and causing no light deterioration upon reproduction.
Now, the present
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Imamura Satoru
Maeda Shuichi
Mitsuhashi Kazuo
Tsukahara Takako
Higel Floyd D.
Mitsubishi Kasei Corporation
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