JPH03175445A - Sheetlike optical recording material - Google Patents

Abstract

PURPOSE:To enable direct image recording by irradiation with laser beams by forming a coating layer of a coating material contg. an optical cationic reaction initiator and a color developing dyestuff as essential components on one side of a sheetlike substrate and specifying the acid strength of the initiator. CONSTITUTION:A coating layer of a coating material contg. an optical cationic reaction initiator and a color developing dyestuff as essential components is formed on one side of a sheetlike substrate and the acid strength of the initiator measured with an indicator measuring the amt. of acid is regulated to <=4.8, preferably <=4.0. The coating material may further contain a sensitizing dyestuff or may contain a mixture of a color developing compsn. with a pigment. A highquality recorded image can directly be obtd. by irradiation with laser beams from a laser light source and developing and fixing operations can be made unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet-like optical recording material. More specifically, the present invention relates to a sheet-like optical recording material useful as an optical recording material that is irradiated with a laser beam.

[Problems to be solved by conventional technology and invention]

In recent years, optical information processing technology that applies optical fiber and laser technology has been developed. Among these optical information processing technologies, data output media require the formation of latent images, development with toner, toner transfer, and fixing processes in order to form images using electrophotographic methods, such as printers that use laser beams. is necessary. As a result, the mechanism of the printer becomes complicated and the main body becomes large.
Power consumption increases. Therefore, a large amount of cost and effort is required to maintain and manage the printer.

Therefore, there is no need for toner transfer and fixing processing,
There has been a demand for the development of optical recording materials that can directly record images using laser beam irradiation.

[Means to solve the problem]

The sheet-like optical recording material according to the present invention has a paint coating layer formed on at least one surface of a sheet-like substrate and containing a photocationic reaction initiator and a color-forming dye (hereinafter referred to as a color-forming composition) as essential components. It is characterized by this.

The sheet-like optical recording material according to the present invention also includes a photocationic reaction initiator, a coloring dye, and a sensitizing dye (hereinafter, when a sensitizing dye is also mixed) formed on at least one surface of the sheet-like substrate. is characterized by having a paint coating layer containing as an essential component a composition containing a photocationic reaction initiator, a color-forming dye, and a sensitizing dye (also referred to as a color-forming composition).

In addition, the sheet-like optical recording material of the present invention has a color density that can be used as a recording material by using one whose acid strength as measured by an indicator for measuring the acid amount of the photocationic reaction initiator used therein is within a predetermined range. can be obtained.

Further, the sheet-like optical recording material of the present invention may contain a mixture of the coloring composition and a pigment.

A sheet-like optical recording material having such a paint coating layer is
A good recorded image can be formed by laser light irradiation.

Next, the acid strength measuring method of the present invention will be described. This is a method of observing the color change of an indicator for measuring acid content, and is shown in New Experimental Chemistry Course 18, Nippon Kagaku Complete Edition, pages 213 to 214.

Approximately 0.1 g of a sample of a photocationic reaction initiator pretreated by an appropriate method was mixed with benzene 5rd! A drop of a benzene solution of 0.01 mol/1 of an acid amount measurement indicator whose acid strength pKa value is known is added dropwise into the test container placed together with the test container. Next, the sheet-shaped optical recording material is irradiated with light at a sensitive wavelength for a certain period of time, and it is visually confirmed that the acid amount measurement indicator changes to an acidic color, and the acid strength of the sample is determined by the pKa value of the indicator. be equal to or less than.

In the present invention, the acid strength of the photocationic reaction initiator is a value of 4.8 or less, preferably 4.8 or less, as measured by the above method.
．． By using a material exhibiting a value of 0 or less, a good recorded image can be obtained by laser beam irradiation.

The materials used in the present invention will be individually explained below.

Acid content measurement indicator> Table 1 shows the acid content measurement indicators used in the present invention, their acid strength p, a, and acid color. (Quoted from New Experimental Chemistry Course 16, Nippon Chemistry Complete Edition, p214, Maruta: Catalyst Chemistry, Kei Itomi long book,
p519, quoted from Tokyo Kagaku Dojin).

Table source: New Experimental Chemistry Course 16, Nippon Chemistry Complete Edition, p214, round lid,
Catalyst Chemistry, Kei Itomi long book, p519, Tokyo Kagaku Doujin Photocation reaction initiators> Photocation reaction initiators that can be used in the present invention include aromatic diazonium salts, triphenylsulfonium salts, halogenated diphenyl salts, Examples include sulfonic acid esters, organic halogen compounds, photosensitive dyes, and iron-arene compounds.

Sensitizing dyes> Sensitizing dyes that can be used in the present invention include cyanine dyes, styryl dyes, pace styryl dyes, porphyrin dyes, xanthine dyes, thioxanthin dyes, thiazine dyes, coumarin dyes, Ketocoumarin dyes, biryllium ring dyes, thiobium salt dyes, thiazole dyes, quinoline dyes, benzophenone dyes and thiobenzophenone dyes are particularly preferred. These sensitizing dyes can be used depending on the wavelength of the laser beam used.

Coloring dyes> Coloring dyes that can be used in the present invention include triphenylmethane dyes, trimethanephthalide dyes, phenothiazine dyes, phenoxazine dyes, fluoran dyes,
Indolylphthalide dyes, azaphthalide dyes, diphenylmethane dyes, chromenopyrazole dyes, leucoauramine dyes, rhodamine lactam dyes, azomethine dyes and leucoxanthin dyes are particularly preferred.

Adhesive> In the sheet-like optical recording material of the present invention, the paint coating layer is composed of the coloring composition and an adhesive that binds it together. Examples of adhesives include water-soluble adhesives such as polyvinyl alcohol, polyvinylpyrrolidone, carboxymethyl cellulose, oxidized starch, and casein, as well as styrene-butadiene copolymers, acrylic copolymers,
Synthetic polymer adhesives such as ethylene-vinyl acetate copolymers can be used.

Pigment> In order to improve the printability and writability of the sheet-like optical recording material of the present invention, it is preferable to include a pigment together with the coloring composition in the paint coating layer. Such pigments include clay, calcium carbonate, aluminum hydroxide, silica, satin white, titanium dioxide, talc, barium sulfate, calcium sulfate, calcium sulfite, etc.
Pigments used in ordinary pigment-coated paper can be used, and these may be used alone or in a mixture of two or more.

Blending> The color-forming composition should be blended in such a way that the sensitizing dye is mixed in a proportion of 0.1 mol to 10 mol, preferably 1 mol to 1 mol of the photocationic reaction initiator.
0.5 to 5 mol, and the coloring pigment is 0.1 to 10
mol, preferably 0.5 to 5 mol; The amount of the coloring composition and adhesive in the paint coating layer is such that the adhesive is 1/1 mole of the photocationic reaction initiator.
10 to 10 weight ratio, preferably 115 to 5 weight ratio.

In addition, when blending a pigment in order to impart printability, etc., the amount of pigment is 10 to 1 per 100 parts by weight of the composition.
000 parts by weight, preferably 50 to 300 parts by weight.

Sheet-like Substrate> Examples of the sheet-like substrate used in the optical recording material of the present invention include porous bodies such as paper, nonwoven fabric, and cloth, synthetic paper, polymer film, metal foil, and the like. These may be used alone or in the form of a stack of these.

Contents of Paint Coating Layer> In the sheet-like optical recording material of the present invention, the paint coating layer may contain a reaction accelerator, a reaction modifier, a wetting agent, a coating forming agent, a diluting solvent, etc., as long as the intended use is not impaired. It's okay to do so.

Method of Forming a Paint Coating Layer> To form a paint coating layer containing a coloring composition on a sheet-like substrate, 1. In accordance with a conventional method, a coating liquid having a predetermined composition may be applied onto a sheet-like substrate using a roll coater or the like, and then dried and cured. Further, as long as the quality of the paint coating layer to be formed is not impaired, drying and curing may be carried out using an ultraviolet curing device or an electron beam curing device.

As the laser light source according to the present invention, an argon ion laser, a helium-cadmium laser, a krypton ion laser, a helium-neon laser, a semiconductor laser, etc. can be used.

Further, the sheet-like optical recording material according to the present invention can directly record an image by irradiation with a laser beam from a laser printer. Furthermore, the sheet-like optical recording material according to the present invention can provide clear prints or printed images.

〔Example〕

The present invention will be further explained below with reference to Examples.

Example 5 4,4-di-tert-diphenyliodonium fluorophosphate, which is a halogenated diphenyl salt, was used as a photocationic reaction initiator ffi: 538.3) about 0,
Put 1 g into a wide mouth test container, add benzene 5- to it, and stir well.

A benzene solution of an acid measurement indicator of approximately 0.01 mol/1 and a known acidity pKa value is added to this, and the mixture is further stirred. This reagent was irradiated with ultraviolet light (product name rlJVDX-).
58J (manufactured by UVP) for 5 minutes at 3660 m, and the change of the acid amount measurement indicator to an acidic color was visually observed. As a result, when the acid strength was -4.4 or less, -
It showed a value larger than 5 or 6.

Next, the above 4,4-di-tert-diphenyliodonium fluorophosphate (molecular weight = 538.3)
1 mol, crystal violet lactone (molecular weight:
415.5) 1 mole was dispersed and dissolved in methyl ethyl ketone, and 500% of acrylic copolymer LR-347 (manufactured by Mitsubishi Rayon Co., Ltd.) was added as an adhesive.
g to create a coating solution.

On the other hand, a synthetic paper (thickness 110μ, trade name "YUBO FPG-110J manufactured by Oji Yuka Synthetic Paper Co., Ltd.") was used as a sheet-like substrate, and the above coating liquid was applied with an applicator in an amount of 10 g/m.
'' (solid content) and dried at 80° C. for 2 minutes.

When the surface of the paint coating layer of the sheet-like optical recording material thus obtained was irradiated with a laser beam from an argon ion laser according to a predetermined image pattern, a good blue recorded image was obtained.

Example 2 Aromatic diazonium salt 4 as a photocationic reaction initiator
-N,N-diethylaminobenzene-diazonium hexafluorophosphate (molecule l: 321.2) in Example 1. When measured using the same method as above, the acid strength was 2.0 or less but greater than 1.5.

Next, 4-N,N diethylaminobenzene-diazonium hexafluorophosphate (molecular weight: 321.2) was used as a photocationic reaction initiator, and thiomichler ketone (molecular weight: 284), a thiobenzophenone dye, was used as a sensitizing dye. .4) and 1 mole each of crystal violet lactone (molecular weight: 415.5), which is a triphenylmethanephthalide dye as a coloring dye, were blended while being dispersed and dissolved in methyl ethyl ketone, and further mixed and dispersed with 200 g of aluminum hydroxide. do. Add 500 g of an acrylic copolymer adhesive (trade name: "Cohonyl 40254, manufactured by Nippon Goka Gaku Kogyo Co., Ltd.") to prepare a coating solution.

On the other hand, a PET film (thickness 50μ
), apply the above coating liquid with an applicator until the coating amount is 10
g/m” (solid content), and coated at 100℃ for 2
Dry for a minute.

When the surface of the paint coating layer of the sheet-like optical recording material thus obtained was irradiated with a laser beam from a semiconductor laser light source (oscillation wavelength: 670 nm) according to a predetermined image pattern, a good blue recorded image was obtained. It was also possible to print using normal offset printing or office writing instruments.

Comparative Example Triphenylsulfonium fluorophosphate, a triphenylsulfonium salt, was used as a photocationic reaction initiator (molecular ffi: 408.0>1 mol; crystal violet lactone, a triphenylmethanephthalide dye, was used as a coloring dye) (molecular weight: 415 .5) A sheet-like optical recording material was prepared in the same manner as in Example (2) using 1 mol.

The surface of the coating layer of the sheet-like optical recording material thus obtained was irradiated with a laser beam from an argon ion laser according to a predetermined image pattern, but no recorded image was obtained.

〔Effect of the invention〕

With the sheet-like recording material of the present invention, a good recorded image can be directly obtained by irradiating it with a laser beam from a laser light source, and development and fixing operations are not necessary.

Claims (1)

[Claims] 1. A paint coating layer containing a photocationic reaction initiator and a coloring dye as essential components is provided on at least one surface of a sheet-like substrate, and the acid strength of the photocationic reaction initiator in the paint coating layer is , 4.8 or less. 2. The sheet-like optical recording according to claim 1, wherein the paint coating layer formed on at least one surface of the sheet-like substrate is formed from a photocationic reaction initiator, a coloring dye, and a sensitizing dye. material.