JPH0772787B2 - Optical recording element - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical recording element. More specifically, it relates to an optical recording element comprising a sensitive substance that generates an acid or an oxidant upon irradiation with light and a polymer compound containing a heterocyclic aromatic compound.

[Conventional technology]

Many materials and methods have been studied for information processing technology utilizing light. For example, compact disks and optical disks such as video disks have been put into practical use as typical recording media. Taking a video disk as an example, as one method, a method of punching a metal reflection plate or a method of a recording film using a phase change of a metal thin film is adopted.

[Problems to be solved by the invention]

However, the conventional methods and materials have problems in storage life, recording sensitivity, durability, and safety, and in that the manufacturing method is complicated and expensive.

On the other hand, it is known that when a heterocyclic aromatic compound is reacted with an acid or an oxidizing agent, it becomes a polymer having a color such as red or blue, and these polymers have durability and stability. Some of them are used for dyes, etc.

INDUSTRIAL APPLICABILITY The present invention is for optical recording capable of performing optical writing recording by utilizing a spectrum change of a material in which a heterocyclic aromatic compound is polymerized by generating an acid or an oxidizing agent by light irradiation. The purpose is to provide a device.

[Means for solving problems]

The inventors of the present invention have made extensive studies to solve the above problems, and have found that the object can be achieved by forming a specific element, and have completed the present invention.

That is, the present invention is an optical recording element comprising a photosensitizer which produces an acid or an oxidant upon irradiation with light, a heterocyclic aromatic compound which is polymerized by an acid or an oxidant, and a structural support.

Examples of the light-sensitive substance used in the present invention include fluoride ion, chloride ion, bromide ion, iodide ion, perchlorate ion, hexafluorohirate (VI) ion, tetrafluoroborate ion, and hexafluoroline. (V) acid ion, hexafluoroantimony (V) acid ion, and the like having a halogen or metal halide as an anion, a diaryl iodonium salt, a triaryl sulfonium salt, an aryl diazonium salt, an aromatic sulfone compound, a halogenated alkyl compound, etc. Is mentioned.

Heterocyclic aromatic compounds include heterocyclic 5-membered cyclic compounds such as pyrrole, furan, thiophene, selenophene, tellurophene, imidazole, oxazole, thiazole and pyrazole; heterocyclic 6-membered rings such as pyridine, picoline, pyrimidine, pyrazine and pyridazine. Formula compounds and their substituted compounds, condensed heterocyclic compounds such as indole and carbazole, and the like can be mentioned.

The structure support used in the present invention is not particularly limited as long as it can hold the photoreactive substance and the heterocyclic aromatic compound in an appropriate proportion, and various inorganic and organic compounds can be used, among which Polymer compounds are preferred.
As the polymer compound, an inorganic polymer compound such as glass can be used, but in particular, an organic polymer compound has a moldability, the above-mentioned 2
It has excellent dispersibility of components and can be used favorably.

Examples of the organic polymer compound include polyacrylic acid ester, polymethacrylic acid ester, maleic acid copolymer,
Examples thereof include carboxymethyl cellulose, fibrin, polyvinyl alcohol, polyvinyl ether, polyvinyl pyridine, polyacrylamide, polyacrylonitrile, polyvinyl chloride, polystyrene and its derivatives, nitrocellulose, polyethylene, polypropylene, polyester, polyamide and polycarbonate.

As a molding method of the element, a usual molding method of a polymer compound is used, for example, a method of kneading a photosensitive substance, a heterocyclic compound and a polymer compound with a roll or the like, and dissolving and mixing the above three Examples include a method of removing the solvent by evaporation and a method of impregnating a polymer compound with a liquid in which a photosensitive substance and a heterocyclic compound are dissolved. Used.

[Action]

By irradiating the optical recording element of the present invention with light to generate an acid or an oxidizing agent, the heterocyclic compound is polymerized, whereby the absorption spectrum and the reflection spectrum are changed, and thus the optical recording element is used. Is possible.

〔Example〕

 Hereinafter, the present invention will be further described with reference to the present invention.

Using furan 0.3g as Example 1 light is reactive substance triphenylsulfonium hexafluoroarsenate salt _{((C 6 H 5) 3} S · AsF 6) 0.15g and heterocyclic compounds, polystyrene 0.5 as the polymer compound g was used. After dissolving the above three in 15 ml of methylene chloride, the mixed solution was applied onto a glass substrate by a casting method to form a thin film having a thickness of 10 μm.

When this film was irradiated with light from a light source at a distance of 30 cm using a mercury lamp (500 W), the color of the film which was initially colorless and transparent changed to reddish brown. FIG. 1 shows the change in absorption spectrum before light irradiation.

Further, as a contrast, the same film was formed except that it did not contain a photosensitizer, and light irradiation was performed, but there was no change.

Examples 2 to 10 When various heterocyclic compounds shown in Table 1 were used in place of furan, and light irradiation was performed in the same manner as in Example 1,
The color change shown in Table 1 was observed.

Example 11 A thin film formed in the same manner as in Example 1 was irradiated with a beam-shaped argon laser beam having a diameter of 1 mm at the center of the film, and a change from colorless to blue-green was observed in a spot-shaped region having the same diameter of 1 mm Was done. Moreover, it was confirmed that a line, a curve, and other arbitrary shapes were written by scanning the beam.

〔The invention's effect〕

The optical recording element of the present invention is easily moldable and large-area by using a polymer compound, and the manufacturing method is simple,
The optical recording element having durability and stability can be manufactured at low cost, and has high industrial value.

[Brief description of drawings]

FIG. 1 is a diagram showing changes in absorption spectrum of the device prepared in Example 1 before and after light irradiation. In the figure, 1 is the absorption spectrum before irradiation and 2 is the absorption spectrum after light irradiation for 10 minutes.

Claims (3)

[Claims] 1. An optical recording element comprising a photosensitizer which produces an acid or an oxidant upon irradiation with light, a heterocyclic aromatic compound which is polymerized by an acid or an oxidant, and a structural support. 2. A heterocyclic aromatic compound which is polymerized with an acid or an oxidizing agent is pyrrole, furan, thiophene, selenophene, tellurophene, imidazole, oxazole,
The optical recording element according to claim 1, which is thiazole, piazole, pyridine, picoline, pyrimidine, pyrazine, pyridazine and substituted compounds thereof, indole and carbazole. 3. The optical recording element according to claim 1, wherein the structural support is a polymer compound.