JPH04135787A - Light-and heat-sensitive recording material - Google Patents

Abstract

PURPOSE:To enable red color to develop satisfactorily by using 1-substituted amino-3-alkoxybenzene-4-diazonium salt as a diazo compound and cyclohexane-1,3-dion derivative as a coupling component in an optically sensitive thermal recording material with a recording layer containing a diazo compound, a cou pling component and an organic base provided on a support. CONSTITUTION:One shown by formula I of diazo compounds is recommended. In addition, one shown by formula II of cyclohexane-1,3-dion derivatives is recommended. An organic base is added for the purpose of promoting a coupling reaction. One type alone or more than two different types combined of this organic base can be used. The basic materials are such as tertiary amines, piperidines, piperadines and morpholines as compounds containing nitrogen. It is recommended that 0.1 to 30 pts.wt. of coupling component and 0.1 to 30 pts.wt. of basic material be used for 1 pts.wt. of diazo compound. Thus red color can be developed satisfactorily and high shelf life of thermal recording sheet can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording material that utilizes the photosensitivity of a diazo compound (diazonium salt), and particularly to a red-coloring type light and heat sensitive recording material.

<Prior Art> Three types are known as recording materials that utilize the photosensitivity of diazo compounds.

The first type is known as a wet development type, in which a photosensitive layer containing a diazo compound and a coupling component as main components is provided on a support, this material is superimposed on the original, and after exposure, it is developed in an alkaline solution. It is something to do. The second type is known as a dry development type, which, unlike the wet type, develops with ammonia gas. The second type is known as a heat-developable type, and includes a type that contains an ammonia gas generating agent such as urea that can generate ammonia gas by heating in the photosensitive layer, and a type that contains trichloroacetic acid in the photosensitive layer. There are types that contain alkaline salts of acids that lose their acid properties when heated, and types that utilize higher fatty acid amides as coloring aids to activate diazo compounds and coupling components by heating and melting. .

The wet type uses a developing solution, which requires time and effort to replenish and dispose of the solution, and the equipment is large, which leads to maintenance problems.The wet type also has problems with maintenance, such as the fact that it is wet immediately after copying, making it difficult to make additions quickly. have some problems. In addition, like the wet type, the dry type requires replenishment of developer, requires gas absorption equipment to prevent the generated ammonia gas from leaking outside, and therefore requires larger equipment. There are problems such as the smell of ammonia immediately after copying. On the other hand, unlike the wet and dry types, the heat-developable type has the advantage of maintenance because it does not require a developing solution. Moreover, if the temperature is not controlled to about ±10° C., insufficient development or changes in color tone occur, resulting in an increase in equipment cost. Furthermore, the diazo compound used for such high-temperature development needs to have high heat resistance;
j1 degree formation is often disadvantageous. Low temperature development (9
Although many attempts have been made to increase the temperature at temperatures between 0° C. and 130° C., they have the drawback of decreasing the shelf life of the material itself.
As described above, although the thermal development type is expected to have sufficient advantages in terms of maintenance compared to the wet and dry types, the current situation is that it has not yet become the mainstream of diazo recording systems. Now, in order to obtain the desired color density by heating a material in which a layer containing a diazo compound and a coupling component is provided on a support, each component instantly melts, diffuses, and reacts with the coloring dye. It is necessary to generate , but it is preferable to make the system basic during this reaction because it has the effect of accelerating the reaction. Therefore, in order to produce a light- and heat-sensitive recording material having a recording speed that does not pose a practical problem when heated at low temperatures, it is essential to include a basic substance in the coating layer.

On the other hand, for light and heat sensitive recording materials, it is also an essential requirement to suppress as much as possible the occurrence of coloring of the background part and a decrease in color density during storage before copying.

Although the above-mentioned several attempts have been made to create photosensitive and thermosensitive recording materials that have a good shelf life and a high recording speed, the current situation is that they have not yet reached the point where they can be put to practical use.

If you design a material that can sufficiently develop color and obtain a high concentration even at low heating temperatures, it is natural that a color reaction may occur even if it is stored at room temperature before copying. This appears as a phenomenon in which the bare skin becomes colored. In particular, in the case of red-coloring type recording materials, there is a problem in that even slight coloring (fogging) of the background becomes noticeable due to high visibility. In order to solve this incompatible problem, the inventors of the present invention made extensive studies and found a recording material in which a heat-developable photosensitive layer containing a diazo compound, a coupling component, and a basic substance is provided on a support. , we continued to investigate ways to incorporate the diazo compound into microcapsules, search for basic substances, and how to make microcapsules, and succeeded in suppressing background discoloration during storage before copying ( JP-A-2-54251
issue). Furthermore, as a result of studies aimed at improving the storage stability and oil solubility of diazo compounds, it was discovered that 1-substituted amino-3-alkoxybenzene-4-diazonium salts exhibited excellent performance (Japanese Patent Application No. 169490/1999). issue). Furthermore, as a result of intensive study of the combination with the coupling component, the present inventors found that the diazonium salt
It was discovered that a red pigment having an extremely good hue can be produced in combination with the cyclohexane-1,3-dione derivative described in No. 54251), leading to the present invention.

Therefore, a first object of the present invention is to provide a light and heat sensitive recording material that provides a good red color hue by using a combination of a specific diazo compound and a specific coupling component.

A second object of the present invention is to provide a light and heat sensitive recording material that has excellent storage stability before recording (raw storage stability).

<Means for Solving the Problems> The above-mentioned aspects of the present invention provide a light and heat sensitive recording material in which a recording layer containing a diazo compound, a coupling component, and an organic base is provided on a support. is a 4-substituted amino 2-alkoxybenzenediazonium salt, and the coupling component is cyclohexane-1
, 3-dione derivatives.

Among the diazo compounds according to the present invention, those represented by the following general formula (1) are preferred.

(In the above formula, R'R' and R' may be the same or different and represent an alkyl group, an aralkyl group, an aryl group, and these may further have a substituent,
represents an acid anion. ) In general formula (1), R'
, R' and R' have a substituent, the substituent includes an alkyl group, an aryl group, a hydroxy group, an alkyloxy group, an aryloxy group, an alkylthio group, an allylthio group, an acyl group, an alkoxycarbonyl group, an acyloxy group, Examples include a carbamoyl group, an acylamino group, a halogen atom, and a cyano group.

R' The total number of carbon atoms in R' and R' is preferably 12 or more, particularly preferably 14 or more, from the viewpoint of oil solubility.

In general formula (1), specific examples of the acid anion represented by X- include the following examples.

C, F, , C0OH (n is an integer from 1 to 9), C0F
l,, l5OI H (m is an integer of 1 to 9), boron tetrafluoride, tetraphenylboron, hexafluorophosphoric acid,
Aromatic carboxylic acids, aromatic sulfonic acids.

Furthermore, the siazonium salt may be stabilized by forming a complex compound using zinc chloride, cadmium chloride, tin chloride, or the like.

The diazo compound according to the present invention has a melting point of 30°C to 20°C.
0°C is preferable, but 50°C for handling reasons.
Preferably, the temperature is between 150°C and 150°C.

Furthermore, since it is used by dissolving it in an appropriate solvent (for example, tricresyl phosphate) when it is contained in microcapsules, it preferably has appropriate solubility in these solvents and low water solubility. Specifically, it is preferable to have a solubility in the solvent of 5% or more and a solubility in water of 1% or less.

The diazo compound according to the present invention contains 0.02
It is preferable to use it in the range of ~3c+/m', and from the viewpoint of color density, it is preferably 0.3c+/m'. It is preferable to use it in the range of i to 2 g/m'.

Specific examples of the diazo compound according to the present invention are shown below, but the present invention is not limited thereto.

(A) 0(n-C8H17) (B) 0(n-C6H13) (E) (F) (K) S0C2H4S (nc8H17) (H) (C) 0C2H40C2H40 (n-C4Hg), and the like.

Among the cyclohexane-1,3-dione derivatives according to the present invention, in terms of ease of synthesis and availability of raw materials,
Preferably, the 4th position is substituted with an electron-withdrawing group such as a substituted carbonyl group or a cyan group, or a hydrogen atom.

Among the cyclohexane-1,3-dione derivatives according to the present invention, a compound represented by the following general formula (11) is preferred.

(In the above formula, R" represents a hydrogen atom, a substituted carbonyl group, or a cyan group, and R"R'R'R1 and R
' may be the same or different and represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an aral group, a substituted amino group, a substituted carbonyl group, or a cyano group. ) Among the groups represented by R4 in general formula (11), hydrogen atoms, alkoxycarbonyl groups having 2 to 25 carbon atoms, alkylcarbonyl groups having 2 to 25 carbon atoms, and arylcarbonyl groups having 7 to 30 carbon atoms. , a cyano group is preferred. Particularly preferred are a hydrogen atom, an alkoxycarbonyl group having 2 to 15 carbon atoms, and a cyano group.

Among the groups represented by R', R', R', R' and R' in general formula (11), hydrogen atoms, halogen atoms, alkyl groups having 1 to 20 carbon atoms, and 6 to 25 carbon atoms A 7-aryl group, an aralkyl group having 7 to 25 carbon atoms, and a substituted amino group are preferred.

These groups may further have a substituent, and examples of the substituent include an alkyl group, an aryl group, a hydroxy group, an alkyloxy group, an aryloxy group, an alkylthio group, an arylthio group, an acyl group, and an alkoxycarbonyl group. group, acylamino group, carbamoyl group, acylamino group, halogen atom, cyano group, etc. R', R' R
When the groups represented by ', R' and R' represent substituted amino groups, dialkylamino groups having 2 to 30 carbon atoms and acylamino groups having 2 to 30 carbon atoms are preferred. R4 and R', R' and R' F! ' and R' R and R' and R1 and R' may be bonded to each other to form a ring containing a petero atom.

Next, specific examples of the coupling component according to the present invention are shown below, but the present invention is not limited thereto.

16) Examples include.

The microcapsules used in the present invention are
After emulsifying and dispersing a solution of a cyasonium salt and the same or different compounds that react with each other to produce a polymeric substance in a non-aqueous solvent with a boiling point of 95°C in a hydrophilic protective colloid solution, the reaction vessel was depressurized. While increasing the temperature of the system and distilling off the solvent, a wall-forming substance is transferred to the oil droplet surface, and a polymer production reaction by polyaddition and polycondensation proceeds on the oil droplet surface to form a wall film. Preferred are microcapsules produced by substantially no solvent from the viewpoint of obtaining a good shelf life.

Further, in the present invention, the polymeric substance forming the wall of the microcapsule is preferably formed of at least one selected from polyurethane and polyurea.

The nonaqueous solvent for dissolving the diazonium salt used in the present invention is preferably at least one compound selected from halogenated hydrocarbons, fatty acid esters, ketones, and ethers.

The same or different compounds that react with each other to produce a polymer substance forming the walls of the microcapsules used in the present invention are preferably polyurea and urethane, and the corresponding monomers are selected from aromatic or aliphatic isocyanate compounds. . The microcapsules containing the diazo compound of the present invention can be polymerized with a corresponding monomer, and the amount of monomer used is such that the average particle size of the microcapsules is 0.34-12. , wall thickness 0.01~0.
3. Moreover, the diazo compound has 0.
05-5. It is preferable to apply the coating at Og/m'.

In the present invention, the coupling component that can be used for the purpose of hue adjustment, etc. together with the force/mbling component represented by the general formula (11) is one that forms a dye by coupling with a diazo compound in a basic atmosphere. Any compound is possible.

For example, there are so-called active methylene compounds having a methylene group next to a carbonyl group, phenol derivatives, naphthol derivatives, etc. Specific examples include the following, which are used within the range that meets the purpose of the present invention.

Resorcin, Phloroglucin, Sodium 2,3-dihydro-sinaphthalene-6-sulfonate, 1-hydro-2-naphthoic acid morifolinopropylamide, 1,5-
Dihydroxynaphthalene, 2.3-dihydroxynaphthalene, 2.3-dihydroxy-6-sulfanylnaphthalene, 2-hydroxy-3-naphthoic acid morpholinopropylamide, 2-hydroxy-3-naphthoic acid octylamide, 2-hydroxy-3- naphthoic acid anilide, pencylacetonilide, 1-phenyl-3-methyl-5
-pyrazolone, 1-(2,4,6 trichlorophenyl)
-3-anilino-5-pyrazolone, 2-[3-α-(2
, 5-di-tert-amylphenoxy)-butanamidobenzamido]phenol, 2,4-bis-(benzoylacetamino)toluene, 1,3-bis-(pivaloylacetaminomethyl)benzene, An organic base is added in order to make the system basic during thermal development and promote the coupling reaction. These organic bases can be used alone or in combination of two or more. Basic substances include tertiary aminos, piperidines, piperazines, amidines, formamidines,
Examples include nitrogen-containing compounds such as pyridines, guanidines, and morpholines.

In particular, N,N-bis(3-phenoxy-2-
Hydroxypropyl)piperazine, N, NbisC3
-(p-methylphenoxy)-2-hydroxypropylcopiperazine, N,N-bis[3-(p-methoxyphenoxy)-2-hydroxypropylcopiperazine, N,N-bis(3phenylthio-2-hydroxypropyl ) piperazine, N, N-bis[
3-(β-naphthoxy)-2-hydroxypropyl]
Piperazine, N-3-(β-naphthoxy)-2-hydroxypropyl-N-methylbiperazine, 1,4-bis([3-(N-methylpiperazino)-2-hydroxy]
Piperazines such as propyloxy)benzene, N-C
3-(β-naphthoxy)-2-hydroxy]propylmorpholine, 1,4-bis[(3-morpholino-2-hydroxy)propyloxy]benzene, 1,3-bis[(
Morpholines such as 3-morpholino-2-hydroxy)propyloxy]benzene, N-(3-phenoxy-2
-hydroxypropyl)piperidine, piperidines such as N-dodecylpiperidine, triphenylguanidine,
Specifically preferred are guanidines such as tricyclohexylguanidine and dicyclohexylphenylguanidine.

In the present invention, the coupling component is 0.1 to 30 parts by weight and the basic substance is 0.1 to 30 parts by weight per 1 part by weight of the diazo compound.
．． It is preferable to use it in a proportion of 1 to 30 parts by weight.

In the present invention, in addition to the organic base, a coloring aid may be added for the purpose of promoting the coloring reaction.

The coloring aids of the present invention include, for example, phenol derivatives, naphthol derivatives, alkoxy-substituted benzenes, alkoxy-substituted naphthalenes, and hydroxy compounds in the photosensitive layer so that thermal development can be carried out quickly and completely with low energy. , amide compounds, and sulfonamide compounds can be added. These compounds are thought to lower the melting point of the coupling component or the basic substance, or to improve the thermal permeability of the microcapsule wall, resulting in a high color density.

The coloring aids of the present invention also include thermofusible substances.

The heat-melting substance is a substance having a melting point of 50°C to 150°C that is solid at room temperature and melts by heating, and is a substance that dissolves a diazo compound, a coupling component, or a basic substance. Specific examples of these compounds include fatty acid amides, N-substituted fatty acid amides, ketone compounds, urea compounds, esters, and the like.

The coupling component used in the present invention includes a basic substance,
It can also be used as a solid dispersion with a water-soluble polymer using a sand mill etc. together with other color development aids, etc.
It is particularly suitable for use in emulsions with appropriate emulsification aids.

Preferred water-soluble polymers include water-soluble polymers used when preparing microcapsules (see, for example, JP-A-59-190886). In this case, the coupling component, the basic substance and the coloring aid are each added in an amount of 5 to 40% by weight based on the water-soluble polymer solution. The dispersed or emulsified particle size is 1
It is preferable that it be 0μ or less.

A free radical generator (a compound that generates free radicals when irradiated with light) used in photopolymerizable compositions can be added to the recording material of the present invention for the purpose of reducing yellowing of the background after copying. . As free radical generators, aromatic ketones,
Examples include quinones, hengeine, benzoin ethers, azo compounds, organic disulfides, and acyloxime esters. The amount of the free radical generator to be added is preferably 0.01 to 5 parts by weight per 1 part by weight of the diazo compound.

Similarly, for the purpose of reducing yellowing, a polymerizable compound having an ethylenically unsaturated bond (hereinafter referred to as a vinyl monomer) can be used.

A vinyl monomer is defined as having at least one ethylenically unsaturated bond (vinyl group, hnylidene group, etc.) in its chemical structure.
It is a compound that has the chemical form of a monomer or a prepolymer. Examples thereof include unsaturated carboxylic acids and salts thereof, esters of unsaturated carboxylic acids and aliphatic polyhydric alcohols, amides of unsaturated carboxylic acids and aliphatic polyhydric amino compounds, and the like. The vinyl monomer is used in an amount of 0.2 to 20 parts by weight per 1 part by weight of the diazo compound.

The free radical generator and vinyl monomer can also be contained in microcapsules together with the diazo compound.

In the present invention, in addition to the above materials, citric acid is used as an acid stabilizer.
Tartaric acid, oxalic acid, boric acid, phosphoric acid, pyrophosphoric acid, etc. can be added.

The recording material of the present invention is produced by preparing a coating solution containing microcapsules containing a diazo compound, a coupling component, an organic base, and other additives, and coating it on a support such as paper or a synthetic resin film with a bar. A photosensitive layer having a thickness of 2.5 to 309/m' is formed by coating and drying by a coating method such as , blade coating, air knife coating, gravure coating, roll coating, spray coating, dip coating, or curtain coating. The recording material of the present invention may have a laminated structure in which the microcapsules, coupling components, bases, etc. may be contained in the same layer as described in the above method, or may be contained in separate layers. You can also do it. It is also possible to provide an intermediate layer on the support as described in Japanese Patent Application No. 177,669/1980, and then coat the photosensitive layer.

As the support of the present invention, any paper support used for ordinary pressure-sensitive paper, thermal paper, dry or wet diazo copying paper, etc. can be used, and in addition, neutral sizing agents such as alkyl ketene dimers can be used. Sized pH, 5-9
Neutral paper (described in Japanese Patent Application No. 55-14281), satisfies the relationship between Steckigt sizing degree and metric basis weight described in Japanese Patent Application Laid-open No. 57-116687, and has a flatness of 9.
Paper of 0 seconds or more, optical surface roughness of 8 μ or less and thickness of 30 to 150 μ as described in JP-A No. 58-136492
paper, density 0.9g/described in JP-A No. 58-69091
am' or less and an optical contact ratio of 15% or more, Canadian Standard Freeness (JI) described in JP-A No. 58-69097.
Paper made from bulbs beaten to 400 cc or more with P8121) to prevent the coating liquid from penetrating, the glossy side of the base paper made by the Yankee machine described in JP-A No. 58-65695 as the coated surface, and the color density and It is also possible to use paper that improves resolving power, such as paper that has been subjected to corona discharge treatment on the base paper described in JP-A No. 59-35985 to improve coating suitability.

Furthermore, the synthetic resin film used as a support in the present invention can be arbitrarily selected from known materials that are stable and dimensionally stable even when heated during the development process. Examples of such films include polyester films such as polyethylene terephthalate and polybutylene terephthalate, cellulose derivative films such as cellulose triacetate films, polystyrene films, polypropylene films, and polyolefin films such as polyethylene. It can be used by pasting them together. The thickness of the support is 20 to 200
μ is used.

When forming an image on the recording material of the present invention, the following method can be used. One is to expose the original to light to form a latent image, and then irradiate light onto areas other than the image forming area to fix the image.The other is to develop color using heat from a thermal pen, thermal head, etc. In this method, after obtaining an image, the area other than the image area is irradiated with light to fix the image. Either method can be preferably used. Various types of fluorescent lamps, xenon lamps, mercury lamps, etc. are used as the light source for exposure, and the fact that this emission spectrum almost matches the absorption spectrum of the diazo compound used in the recording material is that
This is preferable because it allows efficient optical fixation of areas other than the image forming area. Further, in the step of heating and developing the material, a thermal pen, a thermal head, an infrared ray, a high frequency, a beat block, a heat roller, etc. can be used as the heating means.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 [Preparation of capsule liquid A of the present invention]: 3.45 parts of 1-dimoxylamino-3-hexyloxybenzene-4-diazonium hexafluorophosphate and bovine silylene diisocyanate and trimethylolpropane (3:1) ) 18 parts of the adduct were added to 10 parts of ethyl acetate and dissolved by heating. This diazo compound solution was mixed with polyvinyl alcohol 5
．． 2 parts dissolved in 58 parts water;
Emulsification and dispersion was carried out at 0'C to obtain an emulsion with an average particle size of 2.5μ. Add 100 parts of water to the obtained emulsion and add 5 parts of water while stirring.
After heating to 0° C. for 3 hours, a capsule liquid containing a diazo compound in the core material was obtained.

[Preparation of coupler/base emulsion B]: 10 parts of specific compound example (2) of the coupling component of the present invention, 5 parts of triphenylguanidine, and 3 parts of tricresyl phosphate were mixed with 5 parts of ethyl acetate.
0 parts, 15% polyvinyl alcohol aqueous solution 20 parts
In addition to 0 parts, the mixture was emulsified and dispersed using a homogenizer. This is 3
Emulsion B was obtained by removing ethyl acetate while keeping the temperature at 0°C. The average particle size of the emulsion was 0.5μ.

[Preparation of recording material of the present invention] Second capsule liquid A50
850 parts of the emulsion was added to prepare a coating solution. Spread this splashing liquid onto a smooth, transparent polyethylene terephthalate film (
75 μm) using a coating bar, dry weight 1
09/m' and dried at 50° C. for 1 minute to prepare a recording material.

[Color development and fixation test]

A test manuscript (a circle with a diameter of 3 cm painted uniformly black on tracing paper with a 2B pencil) was placed on top of the recording material and exposed to light using a fluorescent lamp. At this time, a fluorescent lamp having an extremely thick emission spectrum of 420 parts m was used. Next, an image was formed by heating for 3 seconds using a heat block heated to 120°C. Also, first 120
After heating with a heat block heated to 'C,
An image was also formed when the entire surface was exposed with a lamp having an absorption maximum at 20 parts m. When the density of the colored portion was measured using a Macbeth densitometer, it was 1.25.

Example 2.3 Compound (9) was used instead of compound (2) used in Example 1.
) (Example 2) and Compound (15) (Example 3) to obtain a coupler/base emulsion, and the same operations as in Example 1 were performed to prepare a recording material and form an image. When the density of the colored part was measured using a Macbeth densitometer, it was found that each
．． 22 (Example 2) and 1.21 (Example 3).

Example 4.5 Instead of 1-dioctylamino-3-hexyloxybenzene-4-diazonium hexafluorophosphate used in Example 1, 1-dibutylamino-3-butoxybenzene-4-diazonium was used. Hexafluorophosphate (Example 4), 1-dioctylamino-3-octyloxybenzene-4-diazonium hexafluorophosphate (
A recording material was prepared and an image was formed by performing the same operations as in Example 1 except that a capsule liquid was obtained using Example 5).

When the density of the colored part was measured using a Macbeth densitometer, it was 1.22 (Example 4) and 1°21 (Example 5), respectively.
Met.

Comparative Example 1 Same as Example 1 except that 1-phenyl-3-octyloxycarbonylpyrazoli-5-one was used instead of compound (2) used in Example 1 to obtain a coupler/base emulsion. The following operations were performed to form an image. The density of the colored portion was measured using a Macbeth densitometer and was found to be 1.21.

Comparative Example 2.3 Instead of 1-dibutylamino-3-butoxybenzene-4-diazonium hexafluorophosphate used in Example 1, 1-morpholino-3-butoxybenzene-4-
Diazonium hexafluorophosphate (Comparative Example 2), 1
An image was formed by carrying out the same operations as in Example 1, except that a capsule liquid was obtained using -morpholino-2.5-dibutobyl cybenzene-4-diazonium hexafluorophosphate (Comparative Example 3). When the density of the colored part was measured using a Macbeth densitometer, it was 1°20 (comparative example 2) and 1.1, respectively.
9 (Comparative Example 3).

[Table 1] Colored hue of recording material and coloring density before and after forced storage Next, a comparison test of the coloring hue of the obtained recording material and its shelf life was conducted.

The color hue was measured by visually observing the formed image.

The raw storage stability test was performed using a thermosensitive recording sheet stored at room temperature and at 60°C.
A comparison was made based on the difference in color density between heat-sensitive recording sheets that were forcibly stored under conditions of 30% RH for 72 hours using a hot plate.

Changes in color density were measured using a Macbeth reflection densitometer.

Table 1 shows the results of coloring hue and coloring density.

These results show that by using the combination of the diazo compound and the force/mbling component of the present invention, the desired red coloring hue can be obtained, and the heat-sensitive recording sheet has excellent shelf life.

Claims (1)

[Scope of Claims] 1) A light and heat sensitive recording material in which a recording layer containing a diazo compound, a coupling component, and an organic base is provided on a support, wherein the diazo compound is a 1-substituted amino-3-alkoxybenzene. - A light and heat sensitive recording material which is a 4-diazonium salt and wherein the coupling component is a cyclohexane-1,3-dione derivative. 2) 2 of the substituted amino groups of the diazo compound according to claim 1
1. A photosensitive and thermosensitive recording material, characterized in that one substituent is selected from an alkyl group, an aralkyl group, and an aryl group, and these substituents do not combine with each other to form a cyclic structure. 3) A light and heat sensitive recording material, characterized in that the diazo compound according to claim 1 has a substituted amino group and an alkoxy group having a total number of carbon atoms of 12 or more. 4) The light and heat sensitive recording material according to claim 1, wherein the diazo compound according to claim 1 is contained in microcapsules.