JPS59198192A - Laser recording material - Google Patents

Abstract

PURPOSE:To provide a laser recording material excellent in recording sensitivity, shape of a recording part and stability in preservation, low in toxicicity and little in error at the time of reading, wherein a light-reflective thin metallic film and a color forming film comprising a specified high polymer are sequentially laminated on a base. CONSTITUTION:The light-reflective thin metallic film (e.g., an Fe, Co or Ag film of 100-3,000Angstrom in thickness) 3 and the color forming film 4 of 5-10mum in thickness comprising preferably 15-90wt% of a high polymer (e.g., a cellulose ester resin) in which a polyacid of molybdenum (e.g., molybdic acid or silicomolybdic acid), a polyacid of tungsten (e.g., tungstic acid or phosphotungstic acid) or an amine complex thereof (e.g., a complex comprising isopropylamine or beta-phenylamine as an amine) is dispersed, are sequentially laminated on the base (e.g., glass or polyvinyl chloride) 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser recording material with high reading efficiency when reading using laser light.

Conventionally, a method is known in which recording is performed by irradiating a recording beam such as a laser beam onto a recording material and causing an optical change in the recording material by melting, deforming, or evaporating the irradiated portion. Recording materials used in this recording method include Te, Bi, Sn. Low melting point metals such as Sb and In? 7. Products with a thin film formed from a dye such as talocyanine are known, but these are unfavorable in terms of recording sensitivity, shape of the recording part, storage stability, and even toxicity. . Of the above, Te, which is often used, is satisfactory in terms of recording sensitivity and shape of the recording part, but Te is preferable in terms of stability and toxicity in storage conditions, and Te, which is often used, is suitable for recording. The optical density ratio between the recorded area and the non-recorded area is small, and errors are likely to occur during optical reading.

Therefore, an object of the present invention is to obtain a recording material that is preferable in terms of recording sensitivity, shape of the recording part, stability under storage conditions, and toxicity.

It has been found that the above object can be achieved by using a thin film of a polymeric compound in which molybdenum or tungsten polyacids or amine complexes of these polyacids are dispersed. The present invention is based on this fact, and the laser recording material of the present invention has a light-reflecting metal thin film and a color-forming thin film laminated in sequence on a support, and the color-forming thin film is composed of molybdenum polyacid, tungsten polyacid, or It is characterized by consisting of a polymer compound in which an amine complex of these polyacids is dispersed.

The present invention will be explained in more detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of the laser recording material 1 of the present invention, in which a metal thin film 3 and a coloring coating are sequentially laminated on a support.

In the above, as the support 2, any material can be used as long as it maintains the shape of the laser recording material of the present invention and is stable; examples include glass, aluminum and other metals,
Single or composite films or plates made of synthetic resins such as polyvinyl chloride, polymethyl methacrylate, polystyrene, polyzolopyrene, polycarbonate, triacetyl cellulose, and polyethylene terephthalate, and glass fibers can be used.

The metal film 3 is provided to increase the contrast of the recording portion of the coloring film described later, and has a high light reflectance (
In addition, it is desirable that the material does not cause a decrease in light reflectance during recording with laser light, such as Fe, Co, Ni, and C.
u, Au, Ag, Ge, AI, Te, Zn.

B], Sn, Se, In, Ga, etc. can be used. The thickness of the metal thin film 3 is generally 100 to 300 AS degrees.

The coloring coating uses molybdenum polyacid or its amine complex, tungsten polyacid or its amine complex as a coloring agent. Specific polyacids include molybdic acid, phosphomolybdic acid, silicomolybdic acid, tungstic acid, phosphotungstic acid, and silicotungstic acid. Further, examples of amines that form the amine complex of the polyacid mentioned in "-" include isopropylamine, β-phenylamine, sialylamine, and cyclohexylamine.

The above polyacid or amine complex is one of them.
A species or seven species or more are selected and dissolved or dispersed using a synthetic resin and a solvent to form a paint, which is coated on the ferrotinous thin film 3 by a known method and dried to form a colored film.

Both oil-soluble and water-soluble polymer compounds can be used as the polymer compound constituting the color-forming film, but gelatin and polyvinyl alcohol, which are water- or alcohol-soluble polymer compounds, are preferred because of their high color density during recording. tree,
It is preferable to use resin, polyvinyl butyral resin, or cellulose ester resin.

The content of the coloring agent in the above colored coating is between 15% by weight and qO% by weight, and if it is less than 15% by weight, the coloring density during recording will not be sufficient, and if the coloring density exceeds 90% by weight, the coloring agent should be applied. Difficult to form by law. Further, the thickness of the coloring film is 3 to 20 μm, preferably 1 to io μm,
If it is less than 3 μm, the color density will be insufficient, and if it exceeds 20 μm, the color development sensitivity and resolution will decrease ().

The above-mentioned uninvented laser recording material has high recording sensitivity (has an excellent recording part shape, is stable under storage conditions,
It is also less toxic.

Furthermore, the laser recording material of the present invention has a large optical density ratio between the recorded portion and the non-recorded portion (and has a small reading error).

Examples for explaining the present invention more specifically are listed below.

Example 1 After cleaning and degreasing a polymethyl methacrylate plate with a thickness of 1S, the surface was coated with /θ-6Tor using a vacuum evaporation device.
AI was deposited under the conditions of r, and the thickness was λoo.

A thin film of A was formed.

Next, 1 g of phosphomolybdic acid was dissolved in 9 g of a 10% ethyl alcohol solution of polyvinyl butyral resin (Shimiki Chemical Co., Ltd., Eslec BMS). Using a spinner, the AI-deposited thin film surface of the polymethyl methacrylate board was It was coated and dried to form a recording layer with a thickness of 7 μm.

Wavelength A3 from the recording layer side of the recording material obtained as described above.
A 2gA He-Ne laser with Nk=0. '13 lens focuses the light, and the laser power on the recording layer surface is 10mW.
The output was adjusted so that the recording material was scanned at a scanning speed of 100 mm/s.

After scanning, the irradiated area was observed under a microscope and a black color with a diameter of 3 μm had occurred.

The voltage values generated when the recording material obtained above was irradiated with a laser beam and the reflected light from the recorded and unrecorded areas were received by a photodiode are shown in the table below along with comparative examples. As a comparative example, an acrylic plate in which Te was deposited on the surface to a thickness of tlooA was used.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of the laser recording material of the present invention. l ・・・・・・・・・・・・Laser recording material...
......Support 3...Metal thin film q...Coloring coating 7- Fig. 1

Claims (1)

[Claims] (1) A light-reflecting metal thin film and a coloring thin film are sequentially laminated on a support, and the coloring thin film is made of a polymer compound in which molybdenum polyacid, tungsten polyacid, or an amine complex of these polyacids is dispersed. Laser recording material featuring KotoZ.