JPH0349986A - Thermal recording material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat-sensitive recording material. More specifically, the present invention maintains excellent quality in terms of image color development, recording suitability, and storage stability, and at the same time,
The present invention relates to a heat-sensitive recording material having improved printed surface gloss.

[Conventional technology]

Thermosensitive recording materials generally contain a substantially colorless color-forming substance such as an electron-donating leuco dye and an electron-accepting phenolic compound on one side of a support such as paper, synthetic paper, or plastic film. A thermosensitive coloring layer containing an organic acidic color developer and a binder as main components is provided, and a color-forming recorded image is obtained by causing these color-forming dyes and the color developer to react with thermal energy. be able to.

Such heat-sensitive recording materials have the advantage that recording devices are compact, inexpensive, and easy to maintain, and are therefore widely used in electronic computer outputs, facsimile machines, automatic ticket vending machines, and printers for scientific measuring machines. , or C
It is widely used in applications such as printers for RT medical measurement.

However, conventional heat-sensitive recording materials, in which only a heat-sensitive color-forming layer containing a color-forming dye, a color-developing substance, and a binder as active ingredients are coated on a support, are exposed to light, water, temperature, plasticizers, and oil. For this reason, changes in quality over time during storage have always been a problem. Further, in such conventional heat-sensitive recording materials, since the heat-sensitive color forming layer is exposed, it has been recognized that the gloss of image areas and non-image areas formed by heat-sensitive recording operations is considerably low.

In order to improve the storage stability as described above, it has been proposed to provide a surface layer on the thermosensitive coloring layer and cover it. For example, JP-A-56-146794 discloses forming a surface layer using a hydrophobic polymer compound emulsion, and JP-A-58-19918 discloses forming a surface layer using a hydrophobic polymer compound emulsion.
No. 9 discloses that a water-soluble polymer compound or a hydrophobic polymer compound emulsion is provided as an intermediate layer on a heat-sensitive coloring layer,
It is disclosed that a surface layer is provided thereon using an oil-based paint containing a hydrophobic polymer compound as a resin component.

However, when the above-mentioned surface layer is provided, the surface layer may stick to the thermal head during image recording.
The reality is that the recording suitability is not satisfactory. Especially when recording images with rich gradation, such as with a video printer,
Quality design to prevent sticking is important.

[Problem to be solved by the invention]

The present invention solves the above-mentioned problems of the conventional technology, and has excellent water resistance, plasticizer resistance, oil resistance, etc., long-term storage stability, high recording density, and excellent gradation. Another object of the present invention is to provide a heat-sensitive recording material which has a gloss level equivalent to that of silver halide photographic paper, and which does not cause sticking to a thermal head during heat-sensitive recording operations and has excellent recording suitability. It is something.

That is, the present invention is suitable for use as printer paper for video printers (thermal recording devices for CRT images) that provide high-quality photographic images that have been used in recent years.
In addition, it can be used for coupon tickets, commuter passes, etc. that require shelf life,
O3 barcode pricing is suitable for use as label paper to be attached to the packaging surface of fresh foods and meat with high oil content when packaged with polyvinyl chloride film. The aim is to provide a heat-sensitive recording material that can be used as facsimile paper and printer paper.

[Means and effects for solving the problem] The heat-sensitive recording material according to the present invention comprises a support, a substantially colorless coloring dye provided on one surface of the support,
A color developer that can develop color by reacting with this dye,
a thermosensitive coloring layer containing a binder, an intermediate layer provided on the thermosensitive coloring layer and containing a water-soluble polymeric substance as a main component, a saturated polyester resin provided on the intermediate layer, and a lubricant. a surface glossy layer containing II! as a main component; It is characterized in that fine silicone resin powder having an average particle size of 100 m or less is dispersed therein.

As described above, the heat-sensitive recording material of the present invention is composed of a support, a heat-sensitive coloring layer, an intermediate layer, and a surface gloss layer.

To constitute the support used in the present invention, high-quality paper,
Papers such as medium-quality paper, art paper, cast-coated paper, paperboard, and tissue paper are generally used, but other materials such as plastic film, synthetic paper, laminated paper, and aluminum foil can also be used. It is generally preferred that the support has a basis weight of 40 to 170 g/rd.

A thermosensitive color forming layer containing a color forming dye, a color developer and a binder is formed on one side of the support by a conventionally known coating method. This thermosensitive coloring layer has -i of 3 to 1
The amount of rrfO is preferably 0 g/rrfO.

The color-forming dye is a substantially colorless electron-donating dye that can develop color by reacting with a color developer under heating. The color-forming dye used in the present invention is, for example, 2,2
Bis(4-(6'-(N-cyclohexyl-N-methylamino)-3'-methylspiro[phthalide-3,9'
-xanthine]=2'-ylamido]phenyl)propane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-piperidino-6-methyl-7-anilinofluorane, 3-(N-methylN -cyclohexylamino)-6-methyl-7-anilinofluorane, 3-diethylamino-7-chloroanilinofluorane, 3-[N
-ethyl-N-(p-methylphenyl)aminoco-6-
Methyl-fuanilitsufluorane, 3-diethylamino-7-(metatrifluoromethyl)anilinofluorane, 3-[N-ethyl-N-tetrahydrofurfurylcoamino-6-methyl-7-anilinofluorane, 3-[N
-ethyl-isopentylcoamino-6-methyl-7-anilinofluorane, 3-(N,N dibutylcoamino-6
- It consists of at least one member of a fluoran dye such as methyl-7-anilinofluorane.

The color developer used in the present invention is composed of an electron-accepting organic acidic substance that can react with a color-forming dye under heating to cause it to develop color. Such a color developer liquefies or vaporizes at room temperature or higher, preferably 70° C. or higher, and reacts with the color-forming dye to develop color.

The color developer used in the present invention is, for example, 4,4'-isopropylidene diphenol [bisphenol Al, 4.
4'-isopropylidene bis(2-chlorophenol)
, 4.4'-isopropylidene bis(2-methylphenol), 4.4'-isopropylidene bis(2,1t
ert-butylphenol), 4,4'-5ec-butylidene diphenol, 4,4'-cyclohexylidene diphenol, 4 tert-butylphenol, 4-
phenylphenol, 4-hydroxydiphenoxide,
Naphthol, β-naphthol, methyl-4-bitroxybenzoate, 4-hydroxy-acetophenone, salicylic acid anilide, novolac-type phenolic resin, halogenated novolak-type phenolic resin, 4.4'--F4bis(3-methyl-5- tert-butylphenol),
Propyl p-hydroxybenzoate, isopropyl p-hydroxybenzoate, butyl p-hydroxybenzoate, benzyl p-hydroxybenzoate, methylbenzyl p-hydroxybenzoate, oxalic acid, maleic acid,
Aliphatic carboxylic acids such as tartaric acid, citric acid, succinic acid, stearic acid, benzoic acid, p-tert-butylbenzoic acid, phthalic acid, gallic acid, salicylic acid, 3-isopropylsalicylic acid, 3.5-di-α-methyl benzylsalicylic acid, bis(4-hydroxyphenyl) sulfide, 1゜7-di(4-hydroxyphenylthio)-3,5-dioxahebutane, p-nitrobenzoic acid, and these organic color developers, such as zinc, magnesium, Salts with polyvalent metals such as aluminum, calcium, titanium, manganese, tin, and nickel, 4,4'-dihydroxydiphenylsulfone,
2.4'-dihydroxydiphenylsulfone, 3.3'
-dihydroxydiphenylsulfone, 3,3'-diamino-4゜4'-dihydroxy-diphenylsulfone, 3
゜3'-Diallyl-4,4'-dihydroxy-diphenylsulfone, 3,3'-dichloro-4,4'-dihydroxydiphenylsulfone, 4-hydroxy-diphenylsulfone, 4-hydroxy-4'-isobrobyldiphenylsulfone Nene, 4-hydroxy-4'-isopropyloxydiphenylsulfone, 4-hydroxy-41-benzyloxydiphenylsulfone, 2,4-dihydroxy-diphenylsulfone, 2,4-dihydroxy-4'methyldiphenylsulfone, 3.4 It consists of at least one member selected from -dihydroxyphenyl-p-)risulfone and the like. This color developer is usually a chromogenic dye 1
It is mixed and used in a proportion of 1 to 5 parts by weight, preferably 1.5 to 3 parts by weight.

As the binder contained in the swear coloring layer, any binder conventionally known as a binder for heat-sensitive coloring layers can be used. However, it is preferable that the mixed liquid does not develop color, aggregate, or become highly viscous when mixed with the respective dispersions of the color-forming dye and color developer; The heat-sensitive recording layer film is required to be tough, to have no desensitizing effect, and to not cause sticking to the thermal head.

Typical water-based binders include polyvinyl alcohol, modified starch, gum arabic, gelatin, methyl cellulose,
Hydroxyethylcellulose, hydroxymethylcellulose, polyvinylpyrrolidone, polyacrylate, polyacrylamide, styrene-maleic anhydride copolymer, methyl vinyl ether-maleic anhydride copolymer, isopropylene-maleic anhydride copolymer, styrene-butylene Genlatex, emulsions of acrylic acid ester copolymers, etc. can be used. In order to impart water resistance to the coating film, reactive groups such as acetoacetyl group, carboxyl group,
Alternatively, it is preferable to use a water-soluble polymer substance containing an amide group or the like in combination with a crosslinking agent.

Examples of crosslinking agents for water-soluble polymer substances include glyoxal,
Dialdehyde compounds such as polyaldehyde, polyamine compounds such as polyethylene amine, epoxy compounds,
Polyamide resins, diglycidyl dimethylol urea compounds such as glycerin diglycidyl ether, and inorganic compounds such as ammonium persulfate, ferric chloride, and magnesium chloride can be used.

The thermosensitive coloring layer may contain a pigment, particularly a white pigment, if necessary. Examples of such pigments include calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcined clay, silica, diatomaceous earth, synthetic aluminum silicate, zinc oxide, titanium oxide, aluminum hydroxide, barium sulfate, and surface-treated pigments. Examples include fine inorganic powders such as calcium carbonate and silica, and fine powders of organic resins such as urea-formalin resin, styrene/methacrylic acid copolymer, and polystyrene resin.

The heat-sensitive coloring layer may contain, if necessary, auxiliary additive components conventionally used in heat-sensitive recording materials, such as fillers, surfactants,
There is no problem in adding a thermofusible substance (or lubricant), etc. Thermofusible substances include, for example, stearamide,
Stearic acid ethylene bisamide, oleic acid amide,
Fatty acid amides such as balmicylic acid amide, coconut fatty acid amide, and behenic acid amide, waxes such as zinc stearate, calcium stearate, polyethylene wax, carnauba wax, paraffin wax, and ester wax, dimethyl terephthalate, dibutyl terephthalate, and terephthalate. Acid dibenzyl ester, isophthalic acid dibutyl ester, ■-hydroxynaphthoic acid phenyl ester, 1,2-di(3-methylphenoxy)ethane, ■.

2-diphenoxyethane, 1-phenoxy-2-(4-
methylphenoxy)ethane, diphenyl carbonate, p-benzylbiphenyl, 2,2'-methylenebis(4-methyl-6-t-butylphenol), 4,4'-butylidenebis(6-t-butyl-3-methylphenol), 1.
1.3-) Lis(2-methyl-4-hydroxy-5-t
-butylphenyl) titanium, 2,2'-methylenebis(
Hindered phenols such as 4-ethyl-6-t-butylphenol), 2,4-di-t-butyl-3-methylphenol, and 4,4'-thiobis(3-methyl-6-t-butylphenol);2-(2'-hydroxy-5
Examples include various heat-fusible substances such as sensitizers such as '-methylphenyl)-benzotriazole and 2-hydroxy-4-benzyloxybenzophenone, lubricants, antioxidants, and ultraviolet inhibitors. Among these additives, the thermofusible substance is generally preferably contained in the heat-sensitive coloring layer at a ratio of 4 parts by weight or less per 1 part by weight of the color developer.

In the heat-sensitive recording material of the present invention, an intermediate layer is formed on the heat-sensitive coloring layer. Since this intermediate layer usually consists of a water-soluble polymeric substance as a main component, a pigment and a crosslinking agent are usually added thereto. The purpose of the intermediate layer is to improve the water resistance, plasticizer resistance, and oil resistance of the heat-sensitive recording material, particularly the heat-sensitive coloring layer. With the improvement of these properties, adverse effects caused by water, plasticizers, oils, etc., such as fading of the colored part, can be reliably avoided.

As the water-soluble polymer substance used for this purpose, those having a barrier effect such as polyvinyl alcohol resin and casein can be used. As the polyvinyl alcohol resin, polyvinyl alcohol having any degree of polymerization and saponification can be used. Further, as polymeric substances, unsaturated carboxylic acids or partial or complete esters thereof, salts, anhydrides, nitriles, amides, unsaturated sulfonic acids or their salts, α-olefins having 2 to 30 carbon atoms, vinyl ethers, saturated branched fatty acid vinyls, etc. It is also possible to use polyvinyl alcohol that has been copolymerized and modified, such as polyvinyl alcohol that has been subjected to urethanization, acetalization, etherification, grafting, phosphoric acid esterification, sulfuric acid esterification, or acetoacetic esterification. . The degree of polymerization of the polymer substance is preferably in the range of 300 to 1,700, and particularly preferably 500 to 1,000 from the viewpoint of paint viscosity and coatability.

In the composition of the intermediate layer, the amount of the water-soluble polymeric substance or the total amount of the water-soluble polymeric substance and the crosslinking agent is preferably 50% by weight or more of the total weight of the intermediate layer. If it is less than this, the resulting heat-sensitive recording material may have insufficient plasticizer resistance, oil resistance, and solvent resistance.

Water-soluble crosslinking agents used in the intermediate layer include dialdehyde compounds such as glyoxal and polyaldehyde, polyamine compounds such as polyethyleneimine, epoxy polyamide resins, diglycidyl compounds such as glycerin diglycidyl ether, dimethylol urea, Other examples include metal salts such as ammonium persulfate, ferric chloride, and magnesium chloride, and inorganic compounds such as ammonium chloride and boric acid.

There is no particular limitation on the amount of the crosslinking agent added, but it is generally preferably 3 to 30% based on the weight of the water-soluble polymer substance.

The pigment added to the intermediate layer is for adsorbing the melt of the surface gloss layer, which will be explained in detail later, and for improving its smoothness.

Such pigments include kaolin, clay, talc,
Calcium carbonate, calcined clay, titanium oxide, diatomaceous earth, silica, synthetic aluminum silicate, synthetic magnesium silicate, aluminum oxide, polystyrene fine particles, urea-formalin resin fine particles, etc. can be used in small quantities (all of which consist of one kind). can.

The pigment content in the intermediate layer is 50% or less based on the total weight of the intermediate layer. It is preferable.

The coating amount of the intermediate layer is adjusted as appropriate to the extent that heat conduction from the thermal head to the coloring layer is not inhibited.
It is usually 1 to 10 g/m, preferably 2 to 1 g/rrr. As a result, desired effects can be obtained without reducing thermal sensitivity.

After coating the intermediate layer, it is desirable to subject it to surface smoothing treatment using a supercalender or the like. If the Bekk smoothness of the intermediate layer is 500 seconds or less, even if a glossy layer is provided on the intermediate layer, a highly glossy surface may not be obtained.

It is adjusted to a Bekk smoothness of seconds, preferably 3000 to 5000 seconds.

In the heat-sensitive recording material of the present invention, a surface gloss layer for imparting high gloss is formed on the intermediate layer.

In the present invention, the surface gloss layer includes a saturated polyester resin, such as a saturated copolymerized polyester resin, a modified polyester resin, etc., and a lubricant.

Saturated copolymerized polyester resin is a resin that is copolycondensed by using a single dicarboxylic acid, a diol, and another dicarboxylic acid or diol component, and the type of dicarboxylic acid and diol By changing the combination, various resins with different properties can be obtained.

The modified polyester resin is polycondensed using a modified acid component and a modified polyol as shown below.

In the formula, n is 6
≦n≦30.

・Polyol bisphenol A Bisphenol B Bisphenol AF Bisphenol S As the modified polyol component, one without phenyl group may be used in combination, or as the acid component, the former (1) having n5 methylene groups may be used in combination. You can.

In addition, each component at the time of synthesis|combination does not have to be single, and may combine two or more as appropriate.

Further, it can be used in combination with other resins as long as there is no particular influence on achieving the object of the present invention.

In order to heat cure the above resin, melamine curing type,
An acid anhydride curing type, isocyanate curing type, or epoxy curing type crosslinking agent may be added. When adding these crosslinking agents, the amount added is determined depending on the OH value of the resin, etc., but it is preferably 1 to 20 parts by weight based on 100 parts by weight of the resin.

The silicone resin fine powder used in the surface gloss layer of the present invention has a network structure in which siloxane bonds extend three-dimensionally, and one alkyl group is bonded to a silicon atom in this structure. , has an intermediate structure between an inorganic compound and an organic compound, has excellent heat resistance, is insoluble in organic solvents, and has excellent dispersibility.

As such silicone resin fine powder, for example, a dispersion of spherical silicone fine particles in an organic medium is commercially available, and such materials can be used.

Such silicone resin particles exhibit excellent effects in improving recording suitability (prevention of sticking, dregs adhesion, etc.),
In particular, it is preferable to use spherical particles with well-uniformed particle sizes in terms of anti-sticking effect, and particles with an average particle size of 1 μm or less are also desirable in terms of recording density and image uniformity. As mentioned above, the silicone resin fine powder needs to have an average particle size of 1 μm or less. Average particle size is 1μ
or more, the recording density of the obtained heat-sensitive recording material,
and image uniformity deteriorates, making it impossible to obtain the desired effect.

Further, the addition of silicone resin fine particles is effective in imparting writability to the surface of the recording material, and even if a large amount of lubricant is used, excellent writability can be exhibited. However, if the amount added is too large, it will adversely affect the gloss of the surface. Therefore, the amount of silicone resin fine powder to be added is 1 to 10% based on the total weight of the surface gloss layer.
It is preferably 15% by weight, and even more preferably from 2 to 10% by weight.

The surface gloss layer of the present invention further contains a lubricant (mold release agent) to ensure compatibility with the thermal head, especially to prevent sticking.
Contains. As the lubricant for the surface gloss layer, solid waxes such as higher fatty acid metal salts, polyethylene wax, and amide wax; fluorine-based and phosphoric acid ester-based surfactants; and reaction-curing silicone oils are used. The amount of these lubricants added is preferably 0.5 to 30% by weight based on the weight of the polyester resin constituting the glossy layer.

The amount of coating of the surface gloss layer is adjusted as appropriate to the extent that heat conduction from the thermal head to the coloring layer is not inhibited, but it is usually 0.1 to 10 g/po, preferably 0.
．． It is preferable to set it to 2-5 g/rrf.

As a result, desired effects can be obtained without reducing thermal sensitivity.

〔Example〕

EXAMPLES The present invention will be explained in more detail below with reference to Examples, but the scope of the present invention is of course not limited to these. In each example, "parts" indicate "parts by weight."

S1” low The following solutions were prepared with the following compositions.

(1) Preparation of liquid A (color-forming dye-binder liquid for thermosensitive color-forming layer) 10% methyl vinyl ether-maleic anhydride copolymer aqueous solution 5 parts water
Part 8 (
2) Preparation of D solution (color developer-binder solution for thermosensitive coloring layer) Water (3) C wave preparation (for intermediate layer) 10% carboxy-modified polyvinyl alcohol aqueous solution 30% polyamide resin 60% kaolin aqueous dispersion Water ( 4) Preparation of solution D (for surface gloss layer) Saturated polyester resin 10% zinc stearate toluene dispersion 22 parts 100 parts 3 parts 70 parts 20 parts 85 parts 80 parts Trifunctional polyisocyanate compound toluene 3 parts 200 parts 50 parts However, the above saturated polyester resin was a copolymer having the following components and composition.

Acid component Terephthalic acid 40 parts Isophthalic acid 40 parts Nonanedicarboxylic acid 20 parts Polyol component Ethylene glycol 40 parts Neopentyl glycol 40 parts Bisphenol A
20 parts of the above solutions A and B were separately dispersed and ground using a sand grinder until the average particle size was 1 μm or less. Solution C was stirred with a stirrer until it became uniform. Solution D was stirred until it became a complete solution.

(5) Formation of thermosensitive coloring layer A coating solution for a heat-sensitive coloring layer was prepared with the following composition.

A liquid 12 parts B liquid
46 parts 60% calcium carbonate 40 parts 10% polyvinyl alcohol aqueous solution 150 parts water
18 parts of this coating liquid at 50 g/r
On the surface of a support made of high quality paper of rr.
g/n (coating and drying to provide a heat-sensitive coloring layer.

(6) Formation of intermediate layer After coating and drying liquid C on the above coloring layer to a dry weight of 3 g/rrf, this was calendered to form an intermediate layer with Bekk smoothness of 3000 seconds. Ta.

(7) Formation of Glossy Layer On the above-mentioned intermediate layer, Liquid D was coated and dried to a dry weight of 2 g/rrf to form a surface glossy layer.

The thus obtained laminate was heat-treated at 40''C for 25 hours to produce a heat-sensitive recording material having a 3N composition of a heat-cured thermosensitive coloring layer, an intermediate layer and a surface gloss layer.

After the above heat-sensitive recording material was left at room temperature for 3 days, solid black recording was performed on it using a heat-sensitive printer UP-811 (trademark, a video heat-sensitive printer manufactured by Sony Corporation), and the sticking suitability in this recording operation was evaluated. The color density of the recorded image was measured using a Macbeth reflection densitometer (RD-91).
4). Furthermore, the glossiness of the surface of the heat-sensitive recording material before recording (the incident angle and the acceptance angle were 75 degrees) and the writability were tested and evaluated. Next, a predetermined test piece was prepared from the recording material by a conventional method, and the water resistance, oil resistance, and polyvinyl chloride film resistance of the colored area were measured by a test method.

(1) Water resistance test: After a test piece was immersed in water for 24 hours (at room temperature), it was taken out, and the elution state of the coating film and the residual concentration after drying were observed and evaluated.

(2) Polyvinyl chloride film resistance test: A soft polyvinyl chloride film was superimposed on the specimen, and after contacting the two for 24 hours at a temperature of 20°C under a load of 300 g/ci, the residual image density was determined. was measured and evaluated.

(3) Oil resistance test: Cottonseed oil was applied to the specimen using the usual method, and the test pieces were heated at 20°C and 40°C.
After being left at each temperature of C for 24 hours, the remaining image density was measured and evaluated.

The results of each test are shown in Table 1.

Implementation fl The same operation as in Example 1 was performed. However, instead of the modified polyester resin in Liquid D (coating for surface gloss layer), the same amount of saturated polyester resin (trademark: P.

14, TG=74°C1 manufactured by Arakawa Chemical Co., Ltd.) was used. The test results of the obtained heat-sensitive recording material are shown in Table 1.

The same operations as in Example 1 were carried out. However, instead of the modified polyester resin in liquid D (coating for surface gloss layer), use the same amount of saturated polyester resin (trademark: 5-36σ, TG=70°).
C1 (manufactured by Takamatsu Yushi Co., Ltd.) was used. The test results of the obtained heat-sensitive recording material are shown in Table 1.

The same operation as in Example 1 of the coal soil was carried out. However, if the spherical silicone resin fine particles (average particle size 0.
Table 1 shows the test results of the heat-sensitive recording material obtained in which 12 parts of 8 tna ) were used instead of 4 parts.

The same operations as in Example 1 were performed for this 1 d product. However, no surface gloss layer was provided on the intermediate layer. The test results of the obtained heat-sensitive recording material are shown in Table 1.

Comparison group 1 The same operation as in Example 1 was performed. However, spherical silicone resin fine particles were not added to Liquid D (coating for surface gloss layer). The test results of the obtained heat-sensitive recording material are shown in Table 1.

Comparison Example 1 The same operation as in Example 1 was performed. However, spherical silicone resin fine particles (average particle size 0.8
ts ), other spherical silicone resin fine particles (
Trademark: Tospearl 120 (average particle size: 2) was used.

The test results of the obtained heat-sensitive recording material are shown in Table 1.

Below are the margins: Table Umbrella 1 *2 ◎ - Very good - Good △ - and \ Bad × - Very poor ◎: There was no sticking to the recording head and no sound was generated.

○: There was no sticking to the recording head, but some sound was generated.

Δ: Slight adhesion to the recording head was observed, and the image was distorted.

×: The recording material often stuck to the recording head, causing poor running of the recording material.

As is clear from Table 1, satisfactory results were obtained with the heat-sensitive recording materials of each Example according to the present invention, but each Comparative Example was unsatisfactory in some property.

〔Effect of the invention〕

The present invention makes it possible to provide a heat-sensitive recording material with excellent water resistance, plasticizer resistance, gloss, and oil resistance by providing an intermediate layer and a surface gloss layer with a specific structure on a heat-sensitive coloring layer. As a result, it was possible to significantly improve the storage stability and glossiness of the heat-sensitive recording material, and to provide excellent anti-sticking properties. As a result, the heat-sensitive recording material of the present invention can be used particularly for CRT medical printer paper, CRT image printer paper, coupon ticket label paper, printer paper for various measuring instruments, etc., which require full-scale long-term shelf life. This has the effect of expanding the usability in a wider range of applications.

Claims (1)

[Scope of Claims] 1. A support, a substantially colorless color-forming dye provided on one surface of the support, a color developer capable of developing a color by reacting with the dye, and a color developer capable of forming a color by reacting with the dye; an intermediate layer provided on the thermosensitive coloring layer and containing a water-soluble polymeric substance as a main component; a thermosensitive coloring layer provided on the intermediate layer and containing a saturated polyester resin and a lubricant; A heat-sensitive recording material, comprising: a surface glossy layer containing as a main component; and a silicone resin fine powder having an average particle size of 1 μm or less is dispersed in the surface glossy layer.